IT. Expert System.

Android Reference

Canvas

android.graphics

Class Canvas

java.lang.Object
- android.graphics.Canvas

Direct Known Subclasses:

HardwareCanvas
```
public class Canvas
extends Object
```
The Canvas class holds the "draw" calls. To draw something, you need 4 basic components: A Bitmap to hold the pixels, a Canvas to host the draw calls (writing into the bitmap), a drawing primitive (e.g. Rect, Path, text, Bitmap), and a paint (to describe the colors and styles for the drawing).

Developer Guides

For more information about how to use Canvas, read the Canvas and Drawables developer guide.

Nested Class Summary

Nested Classes
Modifier and Type Class and Description

static class Canvas.EdgeType

static class Canvas.VertexMode

Nested Classes
Modifier and Type	Class and Description
`static class`	`Canvas.EdgeType`
`static class`	`Canvas.VertexMode`

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`ALL_SAVE_FLAG` restore everything when restore() is called
`static int`	`CLIP_SAVE_FLAG` restore the current clip when restore() is called
`static int`	`CLIP_TO_LAYER_SAVE_FLAG` clip against the layer's bounds
`static int`	`DIRECTION_LTR` Flag for drawTextRun indicating left-to-right run direction.
`static int`	`DIRECTION_RTL` Flag for drawTextRun indicating right-to-left run direction.
`static int`	`FULL_COLOR_LAYER_SAVE_FLAG` the layer needs to 8-bits per color component
`static int`	`HAS_ALPHA_LAYER_SAVE_FLAG` the layer needs to per-pixel alpha
`static int`	`MATRIX_SAVE_FLAG` restore the current matrix when restore() is called
`protected int`	`mDensity`
`protected int`	`mScreenDensity` Used to determine when compatibility scaling is in effect.

Constructor Summary

Constructors
Constructor and Description

Canvas()
Construct an empty raster canvas.

Canvas(Bitmap bitmap)
Construct a canvas with the specified bitmap to draw into.

Constructors
Constructor and Description
`Canvas()` Construct an empty raster canvas.
`Canvas(Bitmap bitmap)` Construct a canvas with the specified bitmap to draw into.

Method Summary

Methods
Modifier and Type	Method and Description
`protected static void`	`checkRange(int length, int offset, int count)`
`boolean`	`clipPath(Path path)` Intersect the current clip with the specified path.
`boolean`	`clipPath(Path path, Region.Op op)` Modify the current clip with the specified path.
`boolean`	`clipRect(float left, float top, float right, float bottom)` Intersect the current clip with the specified rectangle, which is expressed in local coordinates.
`boolean`	`clipRect(float left, float top, float right, float bottom, Region.Op op)` Modify the current clip with the specified rectangle, which is expressed in local coordinates.
`boolean`	`clipRect(int left, int top, int right, int bottom)` Intersect the current clip with the specified rectangle, which is expressed in local coordinates.
`boolean`	`clipRect(Rect rect)` Intersect the current clip with the specified rectangle, which is expressed in local coordinates.
`boolean`	`clipRect(RectF rect)` Intersect the current clip with the specified rectangle, which is expressed in local coordinates.
`boolean`	`clipRect(RectF rect, Region.Op op)` Modify the current clip with the specified rectangle.
`boolean`	`clipRect(Rect rect, Region.Op op)` Modify the current clip with the specified rectangle, which is expressed in local coordinates.
`boolean`	`clipRegion(Region region)` Intersect the current clip with the specified region.
`boolean`	`clipRegion(Region region, Region.Op op)` Modify the current clip with the specified region.
`void`	`concat(Matrix matrix)` Preconcat the current matrix with the specified matrix.
`void`	`drawArc(RectF oval, float startAngle, float sweepAngle, boolean useCenter, Paint paint)` Draw the specified arc, which will be scaled to fit inside the specified oval.
`void`	`drawARGB(int a, int r, int g, int b)` Fill the entire canvas' bitmap (restricted to the current clip) with the specified ARGB color, using srcover porterduff mode.
`void`	`drawBitmap(Bitmap bitmap, float left, float top, Paint paint)` Draw the specified bitmap, with its top/left corner at (x,y), using the specified paint, transformed by the current matrix.
`void`	`drawBitmap(Bitmap bitmap, Matrix matrix, Paint paint)` Draw the bitmap using the specified matrix.
`void`	`drawBitmap(Bitmap bitmap, Rect src, RectF dst, Paint paint)` Draw the specified bitmap, scaling/translating automatically to fill the destination rectangle.
`void`	`drawBitmap(Bitmap bitmap, Rect src, Rect dst, Paint paint)` Draw the specified bitmap, scaling/translating automatically to fill the destination rectangle.
`void`	`drawBitmap(int[] colors, int offset, int stride, float x, float y, int width, int height, boolean hasAlpha, Paint paint)` Treat the specified array of colors as a bitmap, and draw it.
`void`	`drawBitmap(int[] colors, int offset, int stride, int x, int y, int width, int height, boolean hasAlpha, Paint paint)` Legacy version of drawBitmap(int[] colors, ...) that took ints for x,y
`void`	`drawBitmapMesh(Bitmap bitmap, int meshWidth, int meshHeight, float[] verts, int vertOffset, int[] colors, int colorOffset, Paint paint)` Draw the bitmap through the mesh, where mesh vertices are evenly distributed across the bitmap.
`void`	`drawCircle(float cx, float cy, float radius, Paint paint)` Draw the specified circle using the specified paint.
`void`	`drawColor(int color)` Fill the entire canvas' bitmap (restricted to the current clip) with the specified color, using srcover porterduff mode.
`void`	`drawColor(int color, PorterDuff.Mode mode)` Fill the entire canvas' bitmap (restricted to the current clip) with the specified color and porter-duff xfermode.
`void`	`drawLine(float startX, float startY, float stopX, float stopY, Paint paint)` Draw a line segment with the specified start and stop x,y coordinates, using the specified paint.
`void`	`drawLines(float[] pts, int offset, int count, Paint paint)` Draw a series of lines.
`void`	`drawLines(float[] pts, Paint paint)`
`void`	`drawOval(RectF oval, Paint paint)` Draw the specified oval using the specified paint.
`void`	`drawPaint(Paint paint)` Fill the entire canvas' bitmap (restricted to the current clip) with the specified paint.
`void`	`drawPatch(Bitmap bitmap, byte[] chunks, RectF dst, Paint paint)` Draws the specified bitmap as an N-patch (most often, a 9-patches.) Note: Only supported by hardware accelerated canvas at the moment.
`void`	`drawPath(Path path, Paint paint)` Draw the specified path using the specified paint.
`void`	`drawPicture(Picture picture)` Save the canvas state, draw the picture, and restore the canvas state.
`void`	`drawPicture(Picture picture, Rect dst)` Draw the picture, stretched to fit into the dst rectangle.
`void`	`drawPicture(Picture picture, RectF dst)` Draw the picture, stretched to fit into the dst rectangle.
`void`	`drawPoint(float x, float y, Paint paint)` Helper for drawPoints() for drawing a single point.
`void`	`drawPoints(float[] pts, int offset, int count, Paint paint)` Draw a series of points.
`void`	`drawPoints(float[] pts, Paint paint)` Helper for drawPoints() that assumes you want to draw the entire array
`void`	`drawPosText(char[] text, int index, int count, float[] pos, Paint paint)` Deprecated.
`void`	`drawPosText(String text, float[] pos, Paint paint)` Deprecated.
`void`	`drawRect(float left, float top, float right, float bottom, Paint paint)` Draw the specified Rect using the specified paint.
`void`	`drawRect(RectF rect, Paint paint)` Draw the specified Rect using the specified paint.
`void`	`drawRect(Rect r, Paint paint)` Draw the specified Rect using the specified Paint.
`void`	`drawRGB(int r, int g, int b)` Fill the entire canvas' bitmap (restricted to the current clip) with the specified RGB color, using srcover porterduff mode.
`void`	`drawRoundRect(RectF rect, float rx, float ry, Paint paint)` Draw the specified round-rect using the specified paint.
`void`	`drawText(char[] text, int index, int count, float x, float y, Paint paint)` Draw the text, with origin at (x,y), using the specified paint.
`void`	`drawText(CharSequence text, int start, int end, float x, float y, Paint paint)` Draw the specified range of text, specified by start/end, with its origin at (x,y), in the specified Paint.
`void`	`drawText(String text, float x, float y, Paint paint)` Draw the text, with origin at (x,y), using the specified paint.
`void`	`drawText(String text, int start, int end, float x, float y, Paint paint)` Draw the text, with origin at (x,y), using the specified paint.
`void`	`drawTextOnPath(char[] text, int index, int count, Path path, float hOffset, float vOffset, Paint paint)` Draw the text, with origin at (x,y), using the specified paint, along the specified path.
`void`	`drawTextOnPath(String text, Path path, float hOffset, float vOffset, Paint paint)` Draw the text, with origin at (x,y), using the specified paint, along the specified path.
`void`	`drawTextRun(char[] text, int index, int count, int contextIndex, int contextCount, float x, float y, int dir, Paint paint)` Render a run of all LTR or all RTL text, with shaping.
`void`	`drawTextRun(CharSequence text, int start, int end, int contextStart, int contextEnd, float x, float y, int dir, Paint paint)` Render a run of all LTR or all RTL text, with shaping.
`void`	`drawVertices(Canvas.VertexMode mode, int vertexCount, float[] verts, int vertOffset, float[] texs, int texOffset, int[] colors, int colorOffset, short[] indices, int indexOffset, int indexCount, Paint paint)` Draw the array of vertices, interpreted as triangles (based on mode).
`static void`	`freeCaches()` Free up as much memory as possible from private caches (e.g.
`static void`	`freeTextLayoutCaches()` Free up text layout caches
`Rect`	`getClipBounds()` Retrieve the clip bounds.
`boolean`	`getClipBounds(Rect bounds)` Retrieve the clip bounds, returning true if they are non-empty.
`int`	`getDensity()` Returns the target density of the canvas.
`DrawFilter`	`getDrawFilter()`
`protected GL`	`getGL()` Deprecated. This method is not supported and should not be invoked.
`int`	`getHeight()` Returns the height of the current drawing layer
`Matrix`	`getMatrix()` Deprecated.
`void`	`getMatrix(Matrix ctm)` Deprecated.
`int`	`getMaximumBitmapHeight()` Returns the maximum allowed height for bitmaps drawn with this canvas.
`int`	`getMaximumBitmapWidth()` Returns the maximum allowed width for bitmaps drawn with this canvas.
`int`	`getSaveCount()` Returns the number of matrix/clip states on the Canvas' private stack.
`int`	`getWidth()` Returns the width of the current drawing layer
`boolean`	`isHardwareAccelerated()` Indicates whether this Canvas uses hardware acceleration.
`boolean`	`isOpaque()` Return true if the device that the current layer draws into is opaque (i.e.
`boolean`	`quickReject(float left, float top, float right, float bottom, Canvas.EdgeType type)` Return true if the specified rectangle, after being transformed by the current matrix, would lie completely outside of the current clip.
`boolean`	`quickReject(Path path, Canvas.EdgeType type)` Return true if the specified path, after being transformed by the current matrix, would lie completely outside of the current clip.
`boolean`	`quickReject(RectF rect, Canvas.EdgeType type)` Return true if the specified rectangle, after being transformed by the current matrix, would lie completely outside of the current clip.
`void`	`restore()` This call balances a previous call to save(), and is used to remove all modifications to the matrix/clip state since the last save call.
`void`	`restoreToCount(int saveCount)` Efficient way to pop any calls to save() that happened after the save count reached saveCount.
`void`	`rotate(float degrees)` Preconcat the current matrix with the specified rotation.
`void`	`rotate(float degrees, float px, float py)` Preconcat the current matrix with the specified rotation.
`int`	`save()` Saves the current matrix and clip onto a private stack.
`int`	`save(int saveFlags)` Based on saveFlags, can save the current matrix and clip onto a private stack.
`int`	`saveLayer(float left, float top, float right, float bottom, Paint paint, int saveFlags)` Helper version of saveLayer() that takes 4 values rather than a RectF.
`int`	`saveLayer(RectF bounds, Paint paint, int saveFlags)` This behaves the same as save(), but in addition it allocates an offscreen bitmap.
`int`	`saveLayerAlpha(float left, float top, float right, float bottom, int alpha, int saveFlags)` Helper for saveLayerAlpha() that takes 4 values instead of a RectF.
`int`	`saveLayerAlpha(RectF bounds, int alpha, int saveFlags)` This behaves the same as save(), but in addition it allocates an offscreen bitmap.
`void`	`scale(float sx, float sy)` Preconcat the current matrix with the specified scale.
`void`	`scale(float sx, float sy, float px, float py)` Preconcat the current matrix with the specified scale.
`void`	`setBitmap(Bitmap bitmap)` Specify a bitmap for the canvas to draw into.
`void`	`setDensity(int density)` Specifies the density for this Canvas' backing bitmap.
`void`	`setDrawFilter(DrawFilter filter)`
`void`	`setMatrix(Matrix matrix)` Completely replace the current matrix with the specified matrix.
`void`	`setScreenDensity(int density)`
`void`	`setViewport(int width, int height)` Set the viewport dimensions if this canvas is GL based.
`void`	`skew(float sx, float sy)` Preconcat the current matrix with the specified skew.
`void`	`translate(float dx, float dy)` Preconcat the current matrix with the specified translation

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - mDensity
```
protected int mDensity
```
  - mScreenDensity
```
protected int mScreenDensity
```
    Used to determine when compatibility scaling is in effect.
  - DIRECTION_LTR
```
public static final int DIRECTION_LTR
```
    Flag for drawTextRun indicating left-to-right run direction.
    
    See Also:
    Constant Field Values
  - DIRECTION_RTL
```
public static final int DIRECTION_RTL
```
    Flag for drawTextRun indicating right-to-left run direction.
    
    See Also:
    Constant Field Values
  - MATRIX_SAVE_FLAG
```
public static final int MATRIX_SAVE_FLAG
```
    restore the current matrix when restore() is called
    
    See Also:
    Constant Field Values
  - CLIP_SAVE_FLAG
```
public static final int CLIP_SAVE_FLAG
```
    restore the current clip when restore() is called
    
    See Also:
    Constant Field Values
  - HAS_ALPHA_LAYER_SAVE_FLAG
```
public static final int HAS_ALPHA_LAYER_SAVE_FLAG
```
    the layer needs to per-pixel alpha
    
    See Also:
    Constant Field Values
  - FULL_COLOR_LAYER_SAVE_FLAG
```
public static final int FULL_COLOR_LAYER_SAVE_FLAG
```
    the layer needs to 8-bits per color component
    
    See Also:
    Constant Field Values
  - CLIP_TO_LAYER_SAVE_FLAG
```
public static final int CLIP_TO_LAYER_SAVE_FLAG
```
    clip against the layer's bounds
    
    See Also:
    Constant Field Values
  - ALL_SAVE_FLAG
```
public static final int ALL_SAVE_FLAG
```
    restore everything when restore() is called
    
    See Also:
    Constant Field Values
- Constructor Detail
  - Canvas
```
public Canvas()
```
    Construct an empty raster canvas. Use setBitmap() to specify a bitmap to draw into. The initial target density is Bitmap.DENSITY_NONE; this will typically be replaced when a target bitmap is set for the canvas.
  - Canvas
```
public Canvas(Bitmap bitmap)
```
    Construct a canvas with the specified bitmap to draw into. The bitmap must be mutable.
    The initial target density of the canvas is the same as the given bitmap's density.
    
    Parameters:
    bitmap - Specifies a mutable bitmap for the canvas to draw into.
- Method Detail
  - getGL
```
@Deprecated
protected GL getGL()
```
    Deprecated. This method is not supported and should not be invoked.
    
    Returns null.
  - isHardwareAccelerated
```
public boolean isHardwareAccelerated()
```
    Indicates whether this Canvas uses hardware acceleration. Note that this method does not define what type of hardware acceleration may or may not be used.
    
    Returns:
    True if drawing operations are hardware accelerated, false otherwise.
  - setBitmap
```
public void setBitmap(Bitmap bitmap)
```
    Specify a bitmap for the canvas to draw into. As a side-effect, also updates the canvas's target density to match that of the bitmap.
    
    Parameters:
    bitmap - Specifies a mutable bitmap for the canvas to draw into.
    See Also:
    setDensity(int), getDensity()
  - setViewport
```
public void setViewport(int width,
               int height)
```
    Set the viewport dimensions if this canvas is GL based. If it is not, this method is ignored and no exception is thrown.
    
    Parameters:
    width - The width of the viewport
    height - The height of the viewport
  - isOpaque
```
public boolean isOpaque()
```
    Return true if the device that the current layer draws into is opaque (i.e. does not support per-pixel alpha).
    
    Returns:
    true if the device that the current layer draws into is opaque
  - getWidth
```
public int getWidth()
```
    Returns the width of the current drawing layer
    
    Returns:
    the width of the current drawing layer
  - getHeight
```
public int getHeight()
```
    Returns the height of the current drawing layer
    
    Returns:
    the height of the current drawing layer
  - getDensity
```
public int getDensity()
```
    Returns the target density of the canvas. The default density is derived from the density of its backing bitmap, or Bitmap.DENSITY_NONE if there is not one.
    
    Returns:
    Returns the current target density of the canvas, which is used to determine the scaling factor when drawing a bitmap into it.
    See Also:
    setDensity(int), Bitmap.getDensity()
  - setDensity
```
public void setDensity(int density)
```
    Specifies the density for this Canvas' backing bitmap. This modifies the target density of the canvas itself, as well as the density of its backing bitmap via Bitmap.setDensity(int).
    
    Parameters:
    density - The new target density of the canvas, which is used to determine the scaling factor when drawing a bitmap into it. Use Bitmap.DENSITY_NONE to disable bitmap scaling.
    See Also:
    getDensity(), Bitmap.setDensity(int)
  - setScreenDensity
```
public void setScreenDensity(int density)
```
  - getMaximumBitmapWidth
```
public int getMaximumBitmapWidth()
```
    Returns the maximum allowed width for bitmaps drawn with this canvas. Attempting to draw with a bitmap wider than this value will result in an error.
    
    See Also:
    getMaximumBitmapHeight()
  - getMaximumBitmapHeight
```
public int getMaximumBitmapHeight()
```
    Returns the maximum allowed height for bitmaps drawn with this canvas. Attempting to draw with a bitmap taller than this value will result in an error.
    
    See Also:
    getMaximumBitmapWidth()
  - save
```
public int save()
```
    Saves the current matrix and clip onto a private stack. Subsequent calls to translate,scale,rotate,skew,concat or clipRect,clipPath will all operate as usual, but when the balancing call to restore() is made, those calls will be forgotten, and the settings that existed before the save() will be reinstated.
    
    Returns:
    The value to pass to restoreToCount() to balance this save()
  - save
```
public int save(int saveFlags)
```
    Based on saveFlags, can save the current matrix and clip onto a private stack. Subsequent calls to translate,scale,rotate,skew,concat or clipRect,clipPath will all operate as usual, but when the balancing call to restore() is made, those calls will be forgotten, and the settings that existed before the save() will be reinstated.
    
    Parameters:
    saveFlags - flag bits that specify which parts of the Canvas state to save/restore
    
    Returns:
    The value to pass to restoreToCount() to balance this save()
  - saveLayer
```
public int saveLayer(RectF bounds,
            Paint paint,
            int saveFlags)
```
    This behaves the same as save(), but in addition it allocates an offscreen bitmap. All drawing calls are directed there, and only when the balancing call to restore() is made is that offscreen transfered to the canvas (or the previous layer). Subsequent calls to translate, scale, rotate, skew, concat or clipRect, clipPath all operate on this copy. When the balancing call to restore() is made, this copy is deleted and the previous matrix/clip state is restored.
    
    Parameters:
    bounds - May be null. The maximum size the offscreen bitmap needs to be (in local coordinates)
    paint - This is copied, and is applied to the offscreen when restore() is called.
    saveFlags - see _SAVE_FLAG constants
    
    Returns:
    value to pass to restoreToCount() to balance this save()
  - saveLayer
```
public int saveLayer(float left,
            float top,
            float right,
            float bottom,
            Paint paint,
            int saveFlags)
```
    Helper version of saveLayer() that takes 4 values rather than a RectF.
  - saveLayerAlpha
```
public int saveLayerAlpha(RectF bounds,
                 int alpha,
                 int saveFlags)
```
    This behaves the same as save(), but in addition it allocates an offscreen bitmap. All drawing calls are directed there, and only when the balancing call to restore() is made is that offscreen transfered to the canvas (or the previous layer). Subsequent calls to translate, scale, rotate, skew, concat or clipRect, clipPath all operate on this copy. When the balancing call to restore() is made, this copy is deleted and the previous matrix/clip state is restored.
    
    Parameters:
    bounds - The maximum size the offscreen bitmap needs to be (in local coordinates)
    alpha - The alpha to apply to the offscreen when when it is drawn during restore()
    saveFlags - see _SAVE_FLAG constants
    
    Returns:
    value to pass to restoreToCount() to balance this call
  - saveLayerAlpha
```
public int saveLayerAlpha(float left,
                 float top,
                 float right,
                 float bottom,
                 int alpha,
                 int saveFlags)
```
    Helper for saveLayerAlpha() that takes 4 values instead of a RectF.
  - restore
```
public void restore()
```
    This call balances a previous call to save(), and is used to remove all modifications to the matrix/clip state since the last save call. It is an error to call restore() more times than save() was called.
  - getSaveCount
```
public int getSaveCount()
```
    Returns the number of matrix/clip states on the Canvas' private stack. This will equal # save() calls - # restore() calls.
  - restoreToCount
```
public void restoreToCount(int saveCount)
```
    Efficient way to pop any calls to save() that happened after the save count reached saveCount. It is an error for saveCount to be less than 1. Example: int count = canvas.save(); ... // more calls potentially to save() canvas.restoreToCount(count); // now the canvas is back in the same state it was before the initial // call to save().
    
    Parameters:
    saveCount - The save level to restore to.
  - translate
```
public void translate(float dx,
             float dy)
```
    Preconcat the current matrix with the specified translation
    
    Parameters:
    dx - The distance to translate in X
    dy - The distance to translate in Y
  - scale
```
public void scale(float sx,
         float sy)
```
    Preconcat the current matrix with the specified scale.
    
    Parameters:
    sx - The amount to scale in X
    sy - The amount to scale in Y
  - scale
```
public final void scale(float sx,
         float sy,
         float px,
         float py)
```
    Preconcat the current matrix with the specified scale.
    
    Parameters:
    sx - The amount to scale in X
    sy - The amount to scale in Y
    px - The x-coord for the pivot point (unchanged by the scale)
    py - The y-coord for the pivot point (unchanged by the scale)
  - rotate
```
public void rotate(float degrees)
```
    Preconcat the current matrix with the specified rotation.
    
    Parameters:
    degrees - The amount to rotate, in degrees
  - rotate
```
public final void rotate(float degrees,
          float px,
          float py)
```
    Preconcat the current matrix with the specified rotation.
    
    Parameters:
    degrees - The amount to rotate, in degrees
    px - The x-coord for the pivot point (unchanged by the rotation)
    py - The y-coord for the pivot point (unchanged by the rotation)
  - skew
```
public void skew(float sx,
        float sy)
```
    Preconcat the current matrix with the specified skew.
    
    Parameters:
    sx - The amount to skew in X
    sy - The amount to skew in Y
  - concat
```
public void concat(Matrix matrix)
```
    Preconcat the current matrix with the specified matrix.
    
    Parameters:
    matrix - The matrix to preconcatenate with the current matrix
  - setMatrix
```
public void setMatrix(Matrix matrix)
```
    Completely replace the current matrix with the specified matrix. If the matrix parameter is null, then the current matrix is reset to identity. Note: it is recommended to use concat(Matrix), scale(float, float), translate(float, float) and rotate(float) instead of this method.
    
    Parameters:
    matrix - The matrix to replace the current matrix with. If it is null, set the current matrix to identity.
    See Also:
    concat(Matrix)
  - getMatrix
```
@Deprecated
public void getMatrix(Matrix ctm)
```
    Deprecated.
    
    Return, in ctm, the current transformation matrix. This does not alter the matrix in the canvas, but just returns a copy of it.
  - getMatrix
```
@Deprecated
public final Matrix getMatrix()
```
    Deprecated.
    
    Return a new matrix with a copy of the canvas' current transformation matrix.
  - clipRect
```
public boolean clipRect(RectF rect,
               Region.Op op)
```
    Modify the current clip with the specified rectangle.
    
    Parameters:
    rect - The rect to intersect with the current clip
    op - How the clip is modified
    
    Returns:
    true if the resulting clip is non-empty
  - clipRect
```
public boolean clipRect(Rect rect,
               Region.Op op)
```
    Modify the current clip with the specified rectangle, which is expressed in local coordinates.
    
    Parameters:
    rect - The rectangle to intersect with the current clip.
    op - How the clip is modified
    
    Returns:
    true if the resulting clip is non-empty
  - clipRect
```
public boolean clipRect(RectF rect)
```
    Intersect the current clip with the specified rectangle, which is expressed in local coordinates.
    
    Parameters:
    rect - The rectangle to intersect with the current clip.
    
    Returns:
    true if the resulting clip is non-empty
  - clipRect
```
public boolean clipRect(Rect rect)
```
    Intersect the current clip with the specified rectangle, which is expressed in local coordinates.
    
    Parameters:
    rect - The rectangle to intersect with the current clip.
    
    Returns:
    true if the resulting clip is non-empty
  - clipRect
```
public boolean clipRect(float left,
               float top,
               float right,
               float bottom,
               Region.Op op)
```
    Modify the current clip with the specified rectangle, which is expressed in local coordinates.
    
    Parameters:
    left - The left side of the rectangle to intersect with the current clip
    top - The top of the rectangle to intersect with the current clip
    right - The right side of the rectangle to intersect with the current clip
    bottom - The bottom of the rectangle to intersect with the current clip
    op - How the clip is modified
    
    Returns:
    true if the resulting clip is non-empty
  - clipRect
```
public boolean clipRect(float left,
               float top,
               float right,
               float bottom)
```
    Intersect the current clip with the specified rectangle, which is expressed in local coordinates.
    
    Parameters:
    left - The left side of the rectangle to intersect with the current clip
    top - The top of the rectangle to intersect with the current clip
    right - The right side of the rectangle to intersect with the current clip
    bottom - The bottom of the rectangle to intersect with the current clip
    
    Returns:
    true if the resulting clip is non-empty
  - clipRect
```
public boolean clipRect(int left,
               int top,
               int right,
               int bottom)
```
    Intersect the current clip with the specified rectangle, which is expressed in local coordinates.
    
    Parameters:
    left - The left side of the rectangle to intersect with the current clip
    top - The top of the rectangle to intersect with the current clip
    right - The right side of the rectangle to intersect with the current clip
    bottom - The bottom of the rectangle to intersect with the current clip
    
    Returns:
    true if the resulting clip is non-empty
  - clipPath
```
public boolean clipPath(Path path,
               Region.Op op)
```
    Modify the current clip with the specified path.
    
    Parameters:
    path - The path to operate on the current clip
    op - How the clip is modified
    
    Returns:
    true if the resulting is non-empty
  - clipPath
```
public boolean clipPath(Path path)
```
    Intersect the current clip with the specified path.
    
    Parameters:
    path - The path to intersect with the current clip
    
    Returns:
    true if the resulting is non-empty
  - clipRegion
```
public boolean clipRegion(Region region,
                 Region.Op op)
```
    Modify the current clip with the specified region. Note that unlike clipRect() and clipPath() which transform their arguments by the current matrix, clipRegion() assumes its argument is already in the coordinate system of the current layer's bitmap, and so not transformation is performed.
    
    Parameters:
    region - The region to operate on the current clip, based on op
    op - How the clip is modified
    
    Returns:
    true if the resulting is non-empty
  - clipRegion
```
public boolean clipRegion(Region region)
```
    Intersect the current clip with the specified region. Note that unlike clipRect() and clipPath() which transform their arguments by the current matrix, clipRegion() assumes its argument is already in the coordinate system of the current layer's bitmap, and so not transformation is performed.
    
    Parameters:
    region - The region to operate on the current clip, based on op
    
    Returns:
    true if the resulting is non-empty
  - getDrawFilter
```
public DrawFilter getDrawFilter()
```
  - setDrawFilter
```
public void setDrawFilter(DrawFilter filter)
```
  - quickReject
```
public boolean quickReject(RectF rect,
                  Canvas.EdgeType type)
```
    Return true if the specified rectangle, after being transformed by the current matrix, would lie completely outside of the current clip. Call this to check if an area you intend to draw into is clipped out (and therefore you can skip making the draw calls).
    
    Parameters:
    rect - the rect to compare with the current clip
    type - specifies how to treat the edges (BW or antialiased)
    
    Returns:
    true if the rect (transformed by the canvas' matrix) does not intersect with the canvas' clip
  - quickReject
```
public boolean quickReject(Path path,
                  Canvas.EdgeType type)
```
    Return true if the specified path, after being transformed by the current matrix, would lie completely outside of the current clip. Call this to check if an area you intend to draw into is clipped out (and therefore you can skip making the draw calls). Note: for speed it may return false even if the path itself might not intersect the clip (i.e. the bounds of the path intersects, but the path does not).
    
    Parameters:
    path - The path to compare with the current clip
    type - true if the path should be considered antialiased, since that means it may affect a larger area (more pixels) than non-antialiased.
    
    Returns:
    true if the path (transformed by the canvas' matrix) does not intersect with the canvas' clip
  - quickReject
```
public boolean quickReject(float left,
                  float top,
                  float right,
                  float bottom,
                  Canvas.EdgeType type)
```
    Return true if the specified rectangle, after being transformed by the current matrix, would lie completely outside of the current clip. Call this to check if an area you intend to draw into is clipped out (and therefore you can skip making the draw calls).
    
    Parameters:
    left - The left side of the rectangle to compare with the current clip
    top - The top of the rectangle to compare with the current clip
    right - The right side of the rectangle to compare with the current clip
    bottom - The bottom of the rectangle to compare with the current clip
    type - true if the rect should be considered antialiased, since that means it may affect a larger area (more pixels) than non-antialiased.
    
    Returns:
    true if the rect (transformed by the canvas' matrix) does not intersect with the canvas' clip
  - getClipBounds
```
public boolean getClipBounds(Rect bounds)
```
    Retrieve the clip bounds, returning true if they are non-empty.
    
    Parameters:
    bounds - Return the clip bounds here. If it is null, ignore it but still return true if the current clip is non-empty.
    
    Returns:
    true if the current clip is non-empty.
  - getClipBounds
```
public final Rect getClipBounds()
```
    Retrieve the clip bounds.
    
    Returns:
    the clip bounds, or [0, 0, 0, 0] if the clip is empty.
  - drawRGB
```
public void drawRGB(int r,
           int g,
           int b)
```
    Fill the entire canvas' bitmap (restricted to the current clip) with the specified RGB color, using srcover porterduff mode.
    
    Parameters:
    r - red component (0..255) of the color to draw onto the canvas
    g - green component (0..255) of the color to draw onto the canvas
    b - blue component (0..255) of the color to draw onto the canvas
  - drawARGB
```
public void drawARGB(int a,
            int r,
            int g,
            int b)
```
    Fill the entire canvas' bitmap (restricted to the current clip) with the specified ARGB color, using srcover porterduff mode.
    
    Parameters:
    a - alpha component (0..255) of the color to draw onto the canvas
    r - red component (0..255) of the color to draw onto the canvas
    g - green component (0..255) of the color to draw onto the canvas
    b - blue component (0..255) of the color to draw onto the canvas
  - drawColor
```
public void drawColor(int color)
```
    Fill the entire canvas' bitmap (restricted to the current clip) with the specified color, using srcover porterduff mode.
    
    Parameters:
    color - the color to draw onto the canvas
  - drawColor
```
public void drawColor(int color,
             PorterDuff.Mode mode)
```
    Fill the entire canvas' bitmap (restricted to the current clip) with the specified color and porter-duff xfermode.
    
    Parameters:
    color - the color to draw with
    mode - the porter-duff mode to apply to the color
  - drawPaint
```
public void drawPaint(Paint paint)
```
    Fill the entire canvas' bitmap (restricted to the current clip) with the specified paint. This is equivalent (but faster) to drawing an infinitely large rectangle with the specified paint.
    
    Parameters:
    paint - The paint used to draw onto the canvas
  - drawPoints
```
public void drawPoints(float[] pts,
              int offset,
              int count,
              Paint paint)
```
    Draw a series of points. Each point is centered at the coordinate specified by pts[], and its diameter is specified by the paint's stroke width (as transformed by the canvas' CTM), with special treatment for a stroke width of 0, which always draws exactly 1 pixel (or at most 4 if antialiasing is enabled). The shape of the point is controlled by the paint's Cap type. The shape is a square, unless the cap type is Round, in which case the shape is a circle.
    
    Parameters:
    pts - Array of points to draw [x0 y0 x1 y1 x2 y2 ...]
    offset - Number of values to skip before starting to draw.
    count - The number of values to process, after skipping offset of them. Since one point uses two values, the number of "points" that are drawn is really (count >> 1).
    paint - The paint used to draw the points
  - drawPoints
```
public void drawPoints(float[] pts,
              Paint paint)
```
    Helper for drawPoints() that assumes you want to draw the entire array
  - drawPoint
```
public void drawPoint(float x,
             float y,
             Paint paint)
```
    Helper for drawPoints() for drawing a single point.
  - drawLine
```
public void drawLine(float startX,
            float startY,
            float stopX,
            float stopY,
            Paint paint)
```
    Draw a line segment with the specified start and stop x,y coordinates, using the specified paint. NOTE: since a line is always "framed", the Style is ignored in the paint.
    
    Parameters:
    startX - The x-coordinate of the start point of the line
    startY - The y-coordinate of the start point of the line
    paint - The paint used to draw the line
  - drawLines
```
public void drawLines(float[] pts,
             int offset,
             int count,
             Paint paint)
```
    Draw a series of lines. Each line is taken from 4 consecutive values in the pts array. Thus to draw 1 line, the array must contain at least 4 values. This is logically the same as drawing the array as follows: drawLine(pts[0], pts[1], pts[2], pts[3]) followed by drawLine(pts[4], pts[5], pts[6], pts[7]) and so on.
    
    Parameters:
    pts - Array of points to draw [x0 y0 x1 y1 x2 y2 ...]
    offset - Number of values in the array to skip before drawing.
    count - The number of values in the array to process, after skipping "offset" of them. Since each line uses 4 values, the number of "lines" that are drawn is really (count >> 2).
    paint - The paint used to draw the points
  - drawLines
```
public void drawLines(float[] pts,
             Paint paint)
```
  - drawRect
```
public void drawRect(RectF rect,
            Paint paint)
```
    Draw the specified Rect using the specified paint. The rectangle will be filled or framed based on the Style in the paint.
    
    Parameters:
    rect - The rect to be drawn
    paint - The paint used to draw the rect
  - drawRect
```
public void drawRect(Rect r,
            Paint paint)
```
    Draw the specified Rect using the specified Paint. The rectangle will be filled or framed based on the Style in the paint.
    
    Parameters:
    r - The rectangle to be drawn.
    paint - The paint used to draw the rectangle
  - drawRect
```
public void drawRect(float left,
            float top,
            float right,
            float bottom,
            Paint paint)
```
    Draw the specified Rect using the specified paint. The rectangle will be filled or framed based on the Style in the paint.
    
    Parameters:
    left - The left side of the rectangle to be drawn
    top - The top side of the rectangle to be drawn
    right - The right side of the rectangle to be drawn
    bottom - The bottom side of the rectangle to be drawn
    paint - The paint used to draw the rect
  - drawOval
```
public void drawOval(RectF oval,
            Paint paint)
```
    Draw the specified oval using the specified paint. The oval will be filled or framed based on the Style in the paint.
    
    Parameters:
    oval - The rectangle bounds of the oval to be drawn
  - drawCircle
```
public void drawCircle(float cx,
              float cy,
              float radius,
              Paint paint)
```
    Draw the specified circle using the specified paint. If radius is <= 0, then nothing will be drawn. the circle will be filled or framed based on the style in the paint.
    
    Parameters:
    cx - The x-coordinate of the center of the cirle to be drawn
    cy - The y-coordinate of the center of the cirle to be drawn
    radius - The radius of the cirle to be drawn
    paint - The paint used to draw the circle
  - drawArc
```
public void drawArc(RectF oval,
           float startAngle,
           float sweepAngle,
           boolean useCenter,
           Paint paint)
```
    Draw the specified arc, which will be scaled to fit inside the specified oval.
    
    If the start angle is negative or >= 360, the start angle is treated as start angle modulo 360.
    
    If the sweep angle is >= 360, then the oval is drawn completely. Note that this differs slightly from SkPath::arcTo, which treats the sweep angle modulo 360. If the sweep angle is negative, the sweep angle is treated as sweep angle modulo 360
    
    The arc is drawn clockwise. An angle of 0 degrees correspond to the geometric angle of 0 degrees (3 o'clock on a watch.)
    
    Parameters:
    oval - The bounds of oval used to define the shape and size of the arc
    startAngle - Starting angle (in degrees) where the arc begins
    sweepAngle - Sweep angle (in degrees) measured clockwise
    useCenter - If true, include the center of the oval in the arc, and close it if it is being stroked. This will draw a wedge
    paint - The paint used to draw the arc
  - drawRoundRect
```
public void drawRoundRect(RectF rect,
                 float rx,
                 float ry,
                 Paint paint)
```
    Draw the specified round-rect using the specified paint. The roundrect will be filled or framed based on the Style in the paint.
    
    Parameters:
    rect - The rectangular bounds of the roundRect to be drawn
    rx - The x-radius of the oval used to round the corners
    ry - The y-radius of the oval used to round the corners
    paint - The paint used to draw the roundRect
  - drawPath
```
public void drawPath(Path path,
            Paint paint)
```
    Draw the specified path using the specified paint. The path will be filled or framed based on the Style in the paint.
    
    Parameters:
    path - The path to be drawn
    paint - The paint used to draw the path
  - drawPatch
```
public void drawPatch(Bitmap bitmap,
             byte[] chunks,
             RectF dst,
             Paint paint)
```
    Draws the specified bitmap as an N-patch (most often, a 9-patches.) Note: Only supported by hardware accelerated canvas at the moment.
    
    Parameters:
    bitmap - The bitmap to draw as an N-patch
    chunks - The patches information (matches the native struct Res_png_9patch)
    dst - The destination rectangle.
    paint - The paint to draw the bitmap with. may be null
  - drawBitmap
```
public void drawBitmap(Bitmap bitmap,
              float left,
              float top,
              Paint paint)
```
    Draw the specified bitmap, with its top/left corner at (x,y), using the specified paint, transformed by the current matrix.
    Note: if the paint contains a maskfilter that generates a mask which extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), then the bitmap will be drawn as if it were in a Shader with CLAMP mode. Thus the color outside of the original width/height will be the edge color replicated.
    If the bitmap and canvas have different densities, this function will take care of automatically scaling the bitmap to draw at the same density as the canvas.
    
    Parameters:
    bitmap - The bitmap to be drawn
    left - The position of the left side of the bitmap being drawn
    top - The position of the top side of the bitmap being drawn
    paint - The paint used to draw the bitmap (may be null)
  - drawBitmap
```
public void drawBitmap(Bitmap bitmap,
              Rect src,
              RectF dst,
              Paint paint)
```
    Draw the specified bitmap, scaling/translating automatically to fill the destination rectangle. If the source rectangle is not null, it specifies the subset of the bitmap to draw.
    Note: if the paint contains a maskfilter that generates a mask which extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), then the bitmap will be drawn as if it were in a Shader with CLAMP mode. Thus the color outside of the original width/height will be the edge color replicated.
    This function ignores the density associated with the bitmap. This is because the source and destination rectangle coordinate spaces are in their respective densities, so must already have the appropriate scaling factor applied.
    
    Parameters:
    bitmap - The bitmap to be drawn
    src - May be null. The subset of the bitmap to be drawn
    dst - The rectangle that the bitmap will be scaled/translated to fit into
    paint - May be null. The paint used to draw the bitmap
  - drawBitmap
```
public void drawBitmap(Bitmap bitmap,
              Rect src,
              Rect dst,
              Paint paint)
```
    Draw the specified bitmap, scaling/translating automatically to fill the destination rectangle. If the source rectangle is not null, it specifies the subset of the bitmap to draw.
    Note: if the paint contains a maskfilter that generates a mask which extends beyond the bitmap's original width/height (e.g. BlurMaskFilter), then the bitmap will be drawn as if it were in a Shader with CLAMP mode. Thus the color outside of the original width/height will be the edge color replicated.
    This function ignores the density associated with the bitmap. This is because the source and destination rectangle coordinate spaces are in their respective densities, so must already have the appropriate scaling factor applied.
    
    Parameters:
    bitmap - The bitmap to be drawn
    src - May be null. The subset of the bitmap to be drawn
    dst - The rectangle that the bitmap will be scaled/translated to fit into
    paint - May be null. The paint used to draw the bitmap
  - drawBitmap
```
public void drawBitmap(int[] colors,
              int offset,
              int stride,
              float x,
              float y,
              int width,
              int height,
              boolean hasAlpha,
              Paint paint)
```
    Treat the specified array of colors as a bitmap, and draw it. This gives the same result as first creating a bitmap from the array, and then drawing it, but this method avoids explicitly creating a bitmap object which can be more efficient if the colors are changing often.
    
    Parameters:
    colors - Array of colors representing the pixels of the bitmap
    offset - Offset into the array of colors for the first pixel
    stride - The number of colors in the array between rows (must be >= width or <= -width).
    x - The X coordinate for where to draw the bitmap
    y - The Y coordinate for where to draw the bitmap
    width - The width of the bitmap
    height - The height of the bitmap
    hasAlpha - True if the alpha channel of the colors contains valid values. If false, the alpha byte is ignored (assumed to be 0xFF for every pixel).
    paint - May be null. The paint used to draw the bitmap
  - drawBitmap
```
public void drawBitmap(int[] colors,
              int offset,
              int stride,
              int x,
              int y,
              int width,
              int height,
              boolean hasAlpha,
              Paint paint)
```
    Legacy version of drawBitmap(int[] colors, ...) that took ints for x,y
  - drawBitmap
```
public void drawBitmap(Bitmap bitmap,
              Matrix matrix,
              Paint paint)
```
    Draw the bitmap using the specified matrix.
    
    Parameters:
    bitmap - The bitmap to draw
    matrix - The matrix used to transform the bitmap when it is drawn
    paint - May be null. The paint used to draw the bitmap
  - checkRange
```
protected static void checkRange(int length,
              int offset,
              int count)
```
  - drawBitmapMesh
```
public void drawBitmapMesh(Bitmap bitmap,
                  int meshWidth,
                  int meshHeight,
                  float[] verts,
                  int vertOffset,
                  int[] colors,
                  int colorOffset,
                  Paint paint)
```
    Draw the bitmap through the mesh, where mesh vertices are evenly distributed across the bitmap. There are meshWidth+1 vertices across, and meshHeight+1 vertices down. The verts array is accessed in row-major order, so that the first meshWidth+1 vertices are distributed across the top of the bitmap from left to right. A more general version of this methid is drawVertices().
    
    Parameters:
    bitmap - The bitmap to draw using the mesh
    meshWidth - The number of columns in the mesh. Nothing is drawn if this is 0
    meshHeight - The number of rows in the mesh. Nothing is drawn if this is 0
    verts - Array of x,y pairs, specifying where the mesh should be drawn. There must be at least (meshWidth+1) * (meshHeight+1) * 2 + meshOffset values in the array
    vertOffset - Number of verts elements to skip before drawing
    colors - May be null. Specifies a color at each vertex, which is interpolated across the cell, and whose values are multiplied by the corresponding bitmap colors. If not null, there must be at least (meshWidth+1) * (meshHeight+1) + colorOffset values in the array.
    colorOffset - Number of color elements to skip before drawing
    paint - May be null. The paint used to draw the bitmap
  - drawVertices
```
public void drawVertices(Canvas.VertexMode mode,
                int vertexCount,
                float[] verts,
                int vertOffset,
                float[] texs,
                int texOffset,
                int[] colors,
                int colorOffset,
                short[] indices,
                int indexOffset,
                int indexCount,
                Paint paint)
```
    Draw the array of vertices, interpreted as triangles (based on mode). The verts array is required, and specifies the x,y pairs for each vertex. If texs is non-null, then it is used to specify the coordinate in shader coordinates to use at each vertex (the paint must have a shader in this case). If there is no texs array, but there is a color array, then each color is interpolated across its corresponding triangle in a gradient. If both texs and colors arrays are present, then they behave as before, but the resulting color at each pixels is the result of multiplying the colors from the shader and the color-gradient together. The indices array is optional, but if it is present, then it is used to specify the index of each triangle, rather than just walking through the arrays in order.
    
    Parameters:
    mode - How to interpret the array of vertices
    vertexCount - The number of values in the vertices array (and corresponding texs and colors arrays if non-null). Each logical vertex is two values (x, y), vertexCount must be a multiple of 2.
    verts - Array of vertices for the mesh
    vertOffset - Number of values in the verts to skip before drawing.
    texs - May be null. If not null, specifies the coordinates to sample into the current shader (e.g. bitmap tile or gradient)
    texOffset - Number of values in texs to skip before drawing.
    colors - May be null. If not null, specifies a color for each vertex, to be interpolated across the triangle.
    colorOffset - Number of values in colors to skip before drawing.
    indices - If not null, array of indices to reference into the vertex (texs, colors) array.
    indexCount - number of entries in the indices array (if not null).
    paint - Specifies the shader to use if the texs array is non-null.
  - drawText
```
public void drawText(char[] text,
            int index,
            int count,
            float x,
            float y,
            Paint paint)
```
    Draw the text, with origin at (x,y), using the specified paint. The origin is interpreted based on the Align setting in the paint.
    
    Parameters:
    text - The text to be drawn
    x - The x-coordinate of the origin of the text being drawn
    y - The y-coordinate of the origin of the text being drawn
    paint - The paint used for the text (e.g. color, size, style)
  - drawText
```
public void drawText(String text,
            float x,
            float y,
            Paint paint)
```
    Draw the text, with origin at (x,y), using the specified paint. The origin is interpreted based on the Align setting in the paint.
    
    Parameters:
    text - The text to be drawn
    x - The x-coordinate of the origin of the text being drawn
    y - The y-coordinate of the origin of the text being drawn
    paint - The paint used for the text (e.g. color, size, style)
  - drawText
```
public void drawText(String text,
            int start,
            int end,
            float x,
            float y,
            Paint paint)
```
    Draw the text, with origin at (x,y), using the specified paint. The origin is interpreted based on the Align setting in the paint.
    
    Parameters:
    text - The text to be drawn
    start - The index of the first character in text to draw
    end - (end - 1) is the index of the last character in text to draw
    x - The x-coordinate of the origin of the text being drawn
    y - The y-coordinate of the origin of the text being drawn
    paint - The paint used for the text (e.g. color, size, style)
  - drawText
```
public void drawText(CharSequence text,
            int start,
            int end,
            float x,
            float y,
            Paint paint)
```
    Draw the specified range of text, specified by start/end, with its origin at (x,y), in the specified Paint. The origin is interpreted based on the Align setting in the Paint.
    
    Parameters:
    text - The text to be drawn
    start - The index of the first character in text to draw
    end - (end - 1) is the index of the last character in text to draw
    x - The x-coordinate of origin for where to draw the text
    y - The y-coordinate of origin for where to draw the text
    paint - The paint used for the text (e.g. color, size, style)
  - drawTextRun
```
public void drawTextRun(char[] text,
               int index,
               int count,
               int contextIndex,
               int contextCount,
               float x,
               float y,
               int dir,
               Paint paint)
```
    Render a run of all LTR or all RTL text, with shaping. This does not run bidi on the provided text, but renders it as a uniform right-to-left or left-to-right run, as indicated by dir. Alignment of the text is as determined by the Paint's TextAlign value.
    
    Parameters:
    text - the text to render
    index - the start of the text to render
    count - the count of chars to render
    contextIndex - the start of the context for shaping. Must be no greater than index.
    contextCount - the number of characters in the context for shaping. ContexIndex + contextCount must be no less than index + count.
    x - the x position at which to draw the text
    y - the y position at which to draw the text
    dir - the run direction, either DIRECTION_LTR or DIRECTION_RTL.
    paint - the paint
  - drawTextRun
```
public void drawTextRun(CharSequence text,
               int start,
               int end,
               int contextStart,
               int contextEnd,
               float x,
               float y,
               int dir,
               Paint paint)
```
    Render a run of all LTR or all RTL text, with shaping. This does not run bidi on the provided text, but renders it as a uniform right-to-left or left-to-right run, as indicated by dir. Alignment of the text is as determined by the Paint's TextAlign value.
    
    Parameters:
    text - the text to render
    start - the start of the text to render. Data before this position can be used for shaping context.
    end - the end of the text to render. Data at or after this position can be used for shaping context.
    x - the x position at which to draw the text
    y - the y position at which to draw the text
    dir - the run direction, either 0 for LTR or 1 for RTL.
    paint - the paint
  - drawPosText
```
@Deprecated
public void drawPosText(char[] text,
                          int index,
                          int count,
                          float[] pos,
                          Paint paint)
```
    Deprecated.
    
    Draw the text in the array, with each character's origin specified by the pos array. This method does not support glyph composition and decomposition and should therefore not be used to render complex scripts.
    
    Parameters:
    text - The text to be drawn
    index - The index of the first character to draw
    count - The number of characters to draw, starting from index.
    pos - Array of [x,y] positions, used to position each character
    paint - The paint used for the text (e.g. color, size, style)
  - drawPosText
```
@Deprecated
public void drawPosText(String text,
                          float[] pos,
                          Paint paint)
```
    Deprecated.
    
    Draw the text in the array, with each character's origin specified by the pos array. This method does not support glyph composition and decomposition and should therefore not be used to render complex scripts.
    
    Parameters:
    text - The text to be drawn
    pos - Array of [x,y] positions, used to position each character
    paint - The paint used for the text (e.g. color, size, style)
  - drawTextOnPath
```
public void drawTextOnPath(char[] text,
                  int index,
                  int count,
                  Path path,
                  float hOffset,
                  float vOffset,
                  Paint paint)
```
    Draw the text, with origin at (x,y), using the specified paint, along the specified path. The paint's Align setting determins where along the path to start the text.
    
    Parameters:
    text - The text to be drawn
    path - The path the text should follow for its baseline
    hOffset - The distance along the path to add to the text's starting position
    vOffset - The distance above(-) or below(+) the path to position the text
    paint - The paint used for the text (e.g. color, size, style)
  - drawTextOnPath
```
public void drawTextOnPath(String text,
                  Path path,
                  float hOffset,
                  float vOffset,
                  Paint paint)
```
    Draw the text, with origin at (x,y), using the specified paint, along the specified path. The paint's Align setting determins where along the path to start the text.
    
    Parameters:
    text - The text to be drawn
    path - The path the text should follow for its baseline
    hOffset - The distance along the path to add to the text's starting position
    vOffset - The distance above(-) or below(+) the path to position the text
    paint - The paint used for the text (e.g. color, size, style)
  - drawPicture
```
public void drawPicture(Picture picture)
```
    Save the canvas state, draw the picture, and restore the canvas state. This differs from picture.draw(canvas), which does not perform any save/restore.
    
    Parameters:
    picture - The picture to be drawn
  - drawPicture
```
public void drawPicture(Picture picture,
               RectF dst)
```
    Draw the picture, stretched to fit into the dst rectangle.
  - drawPicture
```
public void drawPicture(Picture picture,
               Rect dst)
```
    Draw the picture, stretched to fit into the dst rectangle.
  - freeCaches
```
public static void freeCaches()
```
    Free up as much memory as possible from private caches (e.g. fonts, images)
  - freeTextLayoutCaches
```
public static void freeTextLayoutCaches()
```
    Free up text layout caches

Content

Android Reference

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Android Reference

Canvas

Class Canvas

Developer Guides

Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

mDensity

mScreenDensity

DIRECTION_LTR

DIRECTION_RTL

MATRIX_SAVE_FLAG

CLIP_SAVE_FLAG

HAS_ALPHA_LAYER_SAVE_FLAG

FULL_COLOR_LAYER_SAVE_FLAG

CLIP_TO_LAYER_SAVE_FLAG

ALL_SAVE_FLAG

Constructor Detail

Canvas

Canvas

Method Detail

getGL

isHardwareAccelerated

setBitmap

setViewport

isOpaque

getWidth

getHeight

getDensity

setDensity

setScreenDensity

getMaximumBitmapWidth

getMaximumBitmapHeight

save

save

saveLayer

saveLayer

saveLayerAlpha

saveLayerAlpha

restore

getSaveCount

restoreToCount

translate

scale

scale

rotate

rotate

skew

concat

setMatrix

getMatrix

getMatrix

clipRect

clipRect

clipRect

clipRect

clipRect

clipRect

clipRect

clipPath

clipPath

clipRegion

clipRegion

getDrawFilter

setDrawFilter

quickReject

quickReject

quickReject

getClipBounds

getClipBounds

drawRGB

drawARGB

drawColor

drawColor

drawPaint

drawPoints