public class PathMeasure extends Object
Modifier and Type | Field and Description |
---|---|
static int |
POSITION_MATRIX_FLAG |
static int |
TANGENT_MATRIX_FLAG |
Constructor and Description |
---|
PathMeasure()
Create an empty PathMeasure object.
|
PathMeasure(Path path,
boolean forceClosed)
Create a PathMeasure object associated with the specified path object
(already created and specified).
|
Modifier and Type | Method and Description |
---|---|
protected void |
finalize()
Invoked when the garbage collector has detected that this instance is no longer reachable.
|
float |
getLength()
Return the total length of the current contour, or 0 if no path is
associated with this measure object.
|
boolean |
getMatrix(float distance,
Matrix matrix,
int flags)
Pins distance to 0 <= distance <= getlength(), and then computes the
corresponding matrix.
|
boolean |
getPosTan(float distance,
float[] pos,
float[] tan)
Pins distance to 0 <= distance <= getlength(), and then computes the
corresponding position and tangent.
|
boolean |
getSegment(float startD,
float stopD,
Path dst,
boolean startWithMoveTo)
Given a start and stop distance, return in dst the intervening
segment(s).
|
boolean |
isClosed()
Return true if the current contour is closed()
|
boolean |
nextContour()
Move to the next contour in the path.
|
void |
setPath(Path path,
boolean forceClosed)
Assign a new path, or null to have none.
|
public static final int POSITION_MATRIX_FLAG
public static final int TANGENT_MATRIX_FLAG
public PathMeasure()
public PathMeasure(Path path, boolean forceClosed)
path
- The path that will be measured by this objectforceClosed
- If true, then the path will be considered as "closed"
even if its contour was not explicitly closed.public void setPath(Path path, boolean forceClosed)
public float getLength()
public boolean getPosTan(float distance, float[] pos, float[] tan)
distance
- The distance along the current contour to samplepos
- If not null, eturns the sampled position (x==[0], y==[1])tan
- If not null, returns the sampled tangent (x==[0], y==[1])public boolean getMatrix(float distance, Matrix matrix, int flags)
distance
- The distance along the associated pathmatrix
- Allocated by the caller, this is set to the transformation
associated with the position and tangent at the specified distanceflags
- Specified what aspects should be returned in the matrix.public boolean getSegment(float startD, float stopD, Path dst, boolean startWithMoveTo)
public boolean isClosed()
public boolean nextContour()
protected void finalize() throws Throwable
Object
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.