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Android Reference

Camera


android.graphics

Class Camera



  • public class Camera
    extends Object
    A camera instance can be used to compute 3D transformations and generate a matrix that can be applied, for instance, on a Canvas.
    • Constructor Summary

      Constructors
      Constructor and Description
      Camera()
      Creates a new camera, with empty transformations.
    • Method Summary

      Methods
      Modifier and Type Method and Description
      void applyToCanvas(Canvas canvas)
      Computes the matrix corresponding to the current transformation and applies it to the specified Canvas.
      float dotWithNormal(float dx, float dy, float dz)
      protected void finalize()
      Invoked when the garbage collector has detected that this instance is no longer reachable.
      float getLocationX()
      Gets the x location of the camera.
      float getLocationY()
      Gets the y location of the camera.
      float getLocationZ()
      Gets the z location of the camera.
      void getMatrix(Matrix matrix)
      Computes the matrix corresponding to the current transformation and copies it to the supplied matrix object.
      void restore()
      Restores the saved state, if any.
      void rotate(float x, float y, float z)
      Applies a rotation transform around all three axis.
      void rotateX(float deg)
      Applies a rotation transform around the X axis.
      void rotateY(float deg)
      Applies a rotation transform around the Y axis.
      void rotateZ(float deg)
      Applies a rotation transform around the Z axis.
      void save()
      Saves the camera state.
      void setLocation(float x, float y, float z)
      Sets the location of the camera.
      void translate(float x, float y, float z)
      Applies a translation transform on all three axis.
    • Constructor Detail

      • Camera

        public Camera()
        Creates a new camera, with empty transformations.
    • Method Detail

      • save

        public void save()
        Saves the camera state. Each save should be balanced with a call to restore().
        See Also:
        save()
      • restore

        public void restore()
        Restores the saved state, if any.
        See Also:
        restore()
      • translate

        public void translate(float x,
                     float y,
                     float z)
        Applies a translation transform on all three axis.
        Parameters:
        x - The distance to translate by on the X axis
        y - The distance to translate by on the Y axis
        z - The distance to translate by on the Z axis
      • rotate

        public void rotate(float x,
                  float y,
                  float z)
        Applies a rotation transform around all three axis.
        Parameters:
        x - The angle of rotation around the X axis, in degrees
        y - The angle of rotation around the Y axis, in degrees
        z - The angle of rotation around the Z axis, in degrees
        See Also:
        rotateX(float), rotateY(float), rotateZ(float)
      • setLocation

        public void setLocation(float x,
                       float y,
                       float z)
        Sets the location of the camera. The default location is set at 0, 0, -8.
        Parameters:
        x - The x location of the camera
        y - The y location of the camera
        z - The z location of the camera
      • getMatrix

        public void getMatrix(Matrix matrix)
        Computes the matrix corresponding to the current transformation and copies it to the supplied matrix object.
        Parameters:
        matrix - The matrix to copy the current transforms into
      • applyToCanvas

        public void applyToCanvas(Canvas canvas)
        Computes the matrix corresponding to the current transformation and applies it to the specified Canvas.
        Parameters:
        canvas - The Canvas to set the transform matrix onto
      • dotWithNormal

        public float dotWithNormal(float dx,
                          float dy,
                          float dz)
      • finalize

        protected void finalize()
                         throws Throwable
        Description copied from class: Object
        Invoked when the garbage collector has detected that this instance is no longer reachable. The default implementation does nothing, but this method can be overridden to free resources.

        Note that objects that override finalize are significantly more expensive than objects that don't. Finalizers may be run a long time after the object is no longer reachable, depending on memory pressure, so it's a bad idea to rely on them for cleanup. Note also that finalizers are run on a single VM-wide finalizer thread, so doing blocking work in a finalizer is a bad idea. A finalizer is usually only necessary for a class that has a native peer and needs to call a native method to destroy that peer. Even then, it's better to provide an explicit close method (and implement Closeable), and insist that callers manually dispose of instances. This works well for something like files, but less well for something like a BigInteger where typical calling code would have to deal with lots of temporaries. Unfortunately, code that creates lots of temporaries is the worst kind of code from the point of view of the single finalizer thread.

        If you must use finalizers, consider at least providing your own ReferenceQueue and having your own thread process that queue.

        Unlike constructors, finalizers are not automatically chained. You are responsible for calling super.finalize() yourself.

        Uncaught exceptions thrown by finalizers are ignored and do not terminate the finalizer thread. See Effective Java Item 7, "Avoid finalizers" for more.

        Overrides:
        finalize in class Object
        Throws:
        Throwable


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