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()
Called by the garbage collector on an object when garbage collection
determines that there are no more references to the object.
|
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)
On Build.VERSION_CODES.KITKAT
and earlier
releases, the resulting path may not display on a hardware-accelerated
Canvas. A simple workaround is to add a single operation to this path,
such as dst.rLineTo(0, 0)
.
public boolean isClosed()
public boolean nextContour()
protected void finalize() throws Throwable
Object
finalize
method to dispose of
system resources or to perform other cleanup.
The general contract of finalize
is that it is invoked
if and when the JavaTM virtual
machine has determined that there is no longer any
means by which this object can be accessed by any thread that has
not yet died, except as a result of an action taken by the
finalization of some other object or class which is ready to be
finalized. The finalize
method may take any action, including
making this object available again to other threads; the usual purpose
of finalize
, however, is to perform cleanup actions before
the object is irrevocably discarded. For example, the finalize method
for an object that represents an input/output connection might perform
explicit I/O transactions to break the connection before the object is
permanently discarded.
The finalize
method of class Object
performs no
special action; it simply returns normally. Subclasses of
Object
may override this definition.
The Java programming language does not guarantee which thread will
invoke the finalize
method for any given object. It is
guaranteed, however, that the thread that invokes finalize will not
be holding any user-visible synchronization locks when finalize is
invoked. If an uncaught exception is thrown by the finalize method,
the exception is ignored and finalization of that object terminates.
After the finalize
method has been invoked for an object, no
further action is taken until the Java virtual machine has again
determined that there is no longer any means by which this object can
be accessed by any thread that has not yet died, including possible
actions by other objects or classes which are ready to be finalized,
at which point the object may be discarded.
The finalize
method is never invoked more than once by a Java
virtual machine for any given object.
Any exception thrown by the finalize
method causes
the finalization of this object to be halted, but is otherwise
ignored.