org.eclipse.swt.graphics.Path Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2000, 2012 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.swt.graphics;
import org.eclipse.swt.*;
import org.eclipse.swt.internal.cocoa.*;
/**
* Instances of this class represent paths through the two-dimensional
* coordinate system. Paths do not have to be continuous, and can be
* described using lines, rectangles, arcs, cubic or quadratic bezier curves,
* glyphs, or other paths.
*
* Application code must explicitly invoke the Path.dispose()
* method to release the operating system resources managed by each instance
* when those instances are no longer required.
*
*
* This class requires the operating system's advanced graphics subsystem
* which may not be available on some platforms.
*
*
* @see Path, Pattern snippets
* @see SWT Example: GraphicsExample
* @see Sample code and further information
*
* @since 3.1
*/
public class Path extends Resource {
/**
* the OS resource for the Path
* (Warning: This field is platform dependent)
*
* IMPORTANT: This field is not part of the SWT
* public API. It is marked public only so that it can be shared
* within the packages provided by SWT. It is not available on all
* platforms and should never be accessed from application code.
*
*
* @noreference This field is not intended to be referenced by clients.
*/
public NSBezierPath handle;
boolean closed = true;
/**
* Constructs a new empty Path.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
*
* You must dispose the path when it is no longer required.
*
*
* @param device the device on which to allocate the path
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the device is null and there is no current device
*
* @exception SWTException
* - ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
* @exception SWTError
* - ERROR_NO_HANDLES if a handle for the path could not be obtained
*
*
* @see #dispose()
*/
public Path (Device device) {
super(device);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
handle = NSBezierPath.bezierPath();
if (handle == null) SWT.error(SWT.ERROR_NO_HANDLES);
handle.retain();
handle.moveToPoint(new NSPoint());
init();
} finally {
if (pool != null) pool.release();
}
}
/**
* Constructs a new Path that is a copy of path. If
* flatness is less than or equal to zero, an unflatten
* copy of the path is created. Otherwise, it specifies the maximum
* error between the path and its flatten copy. Smaller numbers give
* better approximation.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
*
* You must dispose the path when it is no longer required.
*
*
* @param device the device on which to allocate the path
* @param path the path to make a copy
* @param flatness the flatness value
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the device is null and there is no current device
* - ERROR_NULL_ARGUMENT - if the path is null
* - ERROR_INVALID_ARGUMENT - if the path has been disposed
*
* @exception SWTException
* - ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
* @exception SWTError
* - ERROR_NO_HANDLES if a handle for the path could not be obtained
*
*
* @see #dispose()
* @since 3.4
*/
public Path (Device device, Path path, float flatness) {
super(device);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
if (path == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (path.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
flatness = Math.max(0, flatness);
if (flatness == 0) {
handle = new NSBezierPath(path.handle.copy().id);
} else {
double /*float*/ defaultFlatness = NSBezierPath.defaultFlatness();
NSBezierPath.setDefaultFlatness(flatness);
handle = path.handle.bezierPathByFlatteningPath();
handle.retain();
NSBezierPath.setDefaultFlatness(defaultFlatness);
}
if (handle == null) SWT.error(SWT.ERROR_NO_HANDLES);
init();
} finally {
if (pool != null) pool.release();
}
}
/**
* Constructs a new Path with the specified PathData.
*
* This operation requires the operating system's advanced
* graphics subsystem which may not be available on some
* platforms.
*
*
* You must dispose the path when it is no longer required.
*
*
* @param device the device on which to allocate the path
* @param data the data for the path
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the device is null and there is no current device
* - ERROR_NULL_ARGUMENT - if the data is null
*
* @exception SWTException
* - ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
*
* @exception SWTError
* - ERROR_NO_HANDLES if a handle for the path could not be obtained
*
*
* @see #dispose()
* @since 3.4
*/
public Path (Device device, PathData data) {
this(device);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
if (data == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
init(data);
} finally {
if (pool != null) pool.release();
}
}
/**
* Adds to the receiver a circular or elliptical arc that lies within
* the specified rectangular area.
*
* The resulting arc begins at startAngle and extends
* for arcAngle degrees.
* Angles are interpreted such that 0 degrees is at the 3 o'clock
* position. A positive value indicates a counter-clockwise rotation
* while a negative value indicates a clockwise rotation.
*
* The center of the arc is the center of the rectangle whose origin
* is (x, y) and whose size is specified by the
* width and height arguments.
*
* The resulting arc covers an area width + 1 pixels wide
* by height + 1 pixels tall.
*
*
* @param x the x coordinate of the upper-left corner of the arc
* @param y the y coordinate of the upper-left corner of the arc
* @param width the width of the arc
* @param height the height of the arc
* @param startAngle the beginning angle
* @param arcAngle the angular extent of the arc, relative to the start angle
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void addArc(float x, float y, float width, float height, float startAngle, float arcAngle) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
NSAffineTransform transform = NSAffineTransform.transform();
transform.translateXBy(x + width / 2f, y + height / 2f);
transform.scaleXBy(width / 2f, height / 2f);
NSBezierPath path = NSBezierPath.bezierPath();
NSPoint center = new NSPoint();
float sAngle = -startAngle;
float eAngle = -(startAngle + arcAngle);
path.appendBezierPathWithArcWithCenter(center, 1, sAngle, eAngle, arcAngle>0);
path.transformUsingAffineTransform(transform);
// handle.appendBezierPath(path);
appendBezierPath(path);
if (closed = (Math.abs(arcAngle) >= 360)) {
handle.closePath();
}
} finally {
if (pool != null) pool.release();
}
}
void appendBezierPath (NSBezierPath path) {
int count = (int)/*64*/path.elementCount();
long /*int*/ points = OS.malloc(3 * NSPoint.sizeof);
if (points == 0) SWT.error(SWT.ERROR_NO_HANDLES);
NSPoint pt1 = new NSPoint();
NSPoint pt2 = new NSPoint();
NSPoint pt3 = new NSPoint();
for (int i = 0; i < count; i++) {
int element = (int)/*64*/path.elementAtIndex(i, points);
switch (element) {
case OS.NSMoveToBezierPathElement:
OS.memmove(pt1, points, NSPoint.sizeof);
if (closed) {
handle.moveToPoint(pt1);
} else {
handle.lineToPoint(pt1);
}
break;
case OS.NSLineToBezierPathElement:
OS.memmove(pt1, points, NSPoint.sizeof);
handle.lineToPoint(pt1);
closed = false;
break;
case OS.NSCurveToBezierPathElement:
OS.memmove(pt1, points, NSPoint.sizeof);
OS.memmove(pt2, points + NSPoint.sizeof, NSPoint.sizeof);
OS.memmove(pt3, points + NSPoint.sizeof + NSPoint.sizeof, NSPoint.sizeof);
handle.curveToPoint(pt3, pt1, pt2);
closed = false;
break;
case OS.NSClosePathBezierPathElement:
handle.closePath();
closed = true;
break;
}
}
OS.free(points);
}
/**
* Adds to the receiver the path described by the parameter.
*
* @param path the path to add to the receiver
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the parameter is null
* - ERROR_INVALID_ARGUMENT - if the parameter has been disposed
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void addPath(Path path) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (path == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (path.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
handle.appendBezierPath(path.handle);
closed = path.closed;
} finally {
if (pool != null) pool.release();
}
}
/**
* Adds to the receiver the rectangle specified by x, y, width and height.
*
* @param x the x coordinate of the rectangle to add
* @param y the y coordinate of the rectangle to add
* @param width the width of the rectangle to add
* @param height the height of the rectangle to add
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void addRectangle(float x, float y, float width, float height) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
NSRect rect = new NSRect();
rect.x = x;
rect.y = y;
rect.width = width;
rect.height = height;
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
handle.appendBezierPathWithRect(rect);
closed = true;
} finally {
if (pool != null) pool.release();
}
}
/**
* Adds to the receiver the pattern of glyphs generated by drawing
* the given string using the given font starting at the point (x, y).
*
* @param string the text to use
* @param x the x coordinate of the starting point
* @param y the y coordinate of the starting point
* @param font the font to use
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the font is null
* - ERROR_INVALID_ARGUMENT - if the font has been disposed
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void addString(String string, float x, float y, Font font) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (font == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (font.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
closed = true;
NSString str = NSString.stringWith(string);
NSTextStorage textStorage = (NSTextStorage)new NSTextStorage().alloc().init();
NSLayoutManager layoutManager = (NSLayoutManager)new NSLayoutManager().alloc().init();
NSTextContainer textContainer = (NSTextContainer)new NSTextContainer().alloc();
NSSize size = new NSSize();
size.width = OS.MAX_TEXT_CONTAINER_SIZE;
size.height = OS.MAX_TEXT_CONTAINER_SIZE;
textContainer.initWithContainerSize(size);
textContainer.setLineFragmentPadding(0);
textStorage.addLayoutManager(layoutManager);
layoutManager.addTextContainer(textContainer);
NSRange range = new NSRange();
range.length = str.length();
/*
* Feature in Cocoa. Adding attributes directly to a NSTextStorage causes
* output to the console and eventually a segmentation fault when printing
* on a thread other than the main thread. The fix is to add attributes to
* a separate NSMutableAttributedString and add it to text storage when done.
*/
NSMutableAttributedString attrStr = (NSMutableAttributedString)new NSMutableAttributedString().alloc();
attrStr.id = attrStr.initWithString(str).id;
attrStr.beginEditing();
attrStr.addAttribute(OS.NSFontAttributeName, font.handle, range);
font.addTraits(attrStr, range);
attrStr.endEditing();
textStorage.setAttributedString(attrStr);
attrStr.release();
range = layoutManager.glyphRangeForTextContainer(textContainer);
if (range.length != 0) {
long /*int*/ glyphs = OS.malloc((range.length + 1) * 4);
long /*int*/ count = layoutManager.getGlyphs(glyphs, range);
NSBezierPath path = NSBezierPath.bezierPath();
for (int i = 0; i < count; i++) {
NSPoint pt = layoutManager.locationForGlyphAtIndex(i);
NSRect lineFragmentRect = layoutManager.lineFragmentUsedRectForGlyphAtIndex(i, 0);
NSFont actualFont = new NSFont(textStorage.attribute(OS.NSFontAttributeName, layoutManager.characterIndexForGlyphAtIndex(i), 0));
pt.x = pt.x + x + lineFragmentRect.x;
pt.y = - pt.y - y - lineFragmentRect.y;
path.moveToPoint(pt);
path.appendBezierPathWithGlyphs(glyphs + (i * 4), 1, actualFont);
}
OS.free(glyphs);
NSAffineTransform transform = NSAffineTransform.transform();
transform.scaleXBy(1, -1);
path.transformUsingAffineTransform(transform);
handle.appendBezierPath(path);
}
textContainer.release();
layoutManager.release();
textStorage.release();
} finally {
if (pool != null) pool.release();
}
}
/**
* Closes the current sub path by adding to the receiver a line
* from the current point of the path back to the starting point
* of the sub path.
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void close() {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
handle.closePath();
closed = true;
} finally {
if (pool != null) pool.release();
}
}
/**
* Returns true if the specified point is contained by
* the receiver and false otherwise.
*
* If outline is true, the point (x, y) checked for containment in
* the receiver's outline. If outline is false, the point is
* checked to see if it is contained within the bounds of the (closed) area
* covered by the receiver.
*
* @param x the x coordinate of the point to test for containment
* @param y the y coordinate of the point to test for containment
* @param gc the GC to use when testing for containment
* @param outline controls whether to check the outline or contained area of the path
* @return true if the path contains the point and false otherwise
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the gc is null
* - ERROR_INVALID_ARGUMENT - if the gc has been disposed
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public boolean contains(float x, float y, GC gc, boolean outline) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (gc == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (gc.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
//TODO - see windows
if (outline) {
long /*int*/ pixel = OS.malloc(4);
if (pixel == 0) SWT.error(SWT.ERROR_NO_HANDLES);
int[] buffer = new int[]{0xFFFFFFFF};
OS.memmove(pixel, buffer, 4);
long /*int*/ colorspace = OS.CGColorSpaceCreateDeviceRGB();
long /*int*/ context = OS.CGBitmapContextCreate(pixel, 1, 1, 8, 4, colorspace, OS.kCGImageAlphaNoneSkipFirst);
OS.CGColorSpaceRelease(colorspace);
if (context == 0) {
OS.free(pixel);
SWT.error(SWT.ERROR_NO_HANDLES);
}
GCData data = gc.data;
int capStyle = 0;
switch (data.lineCap) {
case SWT.CAP_ROUND: capStyle = OS.kCGLineCapRound; break;
case SWT.CAP_FLAT: capStyle = OS.kCGLineCapButt; break;
case SWT.CAP_SQUARE: capStyle = OS.kCGLineCapSquare; break;
}
OS.CGContextSetLineCap(context, capStyle);
int joinStyle = 0;
switch (data.lineJoin) {
case SWT.JOIN_MITER: joinStyle = OS.kCGLineJoinMiter; break;
case SWT.JOIN_ROUND: joinStyle = OS.kCGLineJoinRound; break;
case SWT.JOIN_BEVEL: joinStyle = OS.kCGLineJoinBevel; break;
}
OS.CGContextSetLineJoin(context, joinStyle);
OS.CGContextSetLineWidth(context, data.lineWidth);
OS.CGContextTranslateCTM(context, -x + 0.5f, -y + 0.5f);
long /*int*/ path = GC.createCGPathRef(handle);
OS.CGContextAddPath(context, path);
OS.CGPathRelease(path);
OS.CGContextStrokePath(context);
OS.CGContextRelease(context);
OS.memmove(buffer, pixel, 4);
OS.free(pixel);
return buffer[0] != 0xFFFFFFFF;
} else {
NSPoint point = new NSPoint();
point.x = x;
point.y = y;
return handle.containsPoint(point);
}
} finally {
if (pool != null) pool.release();
}
}
/**
* Adds to the receiver a cubic bezier curve based on the parameters.
*
* @param cx1 the x coordinate of the first control point of the spline
* @param cy1 the y coordinate of the first control of the spline
* @param cx2 the x coordinate of the second control of the spline
* @param cy2 the y coordinate of the second control of the spline
* @param x the x coordinate of the end point of the spline
* @param y the y coordinate of the end point of the spline
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void cubicTo(float cx1, float cy1, float cx2, float cy2, float x, float y) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
NSPoint pt = new NSPoint();
pt.x = x;
pt.y = y;
NSPoint ct1 = new NSPoint();
ct1.x = cx1;
ct1.y = cy1;
NSPoint ct2 = new NSPoint();
ct2.x = cx2;
ct2.y = cy2;
handle.curveToPoint(pt, ct1, ct2);
closed = false;
} finally {
if (pool != null) pool.release();
}
}
@Override
void destroy() {
handle.release();
handle = null;
}
/**
* Replaces the first four elements in the parameter with values that
* describe the smallest rectangle that will completely contain the
* receiver (i.e. the bounding box).
*
* @param bounds the array to hold the result
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the parameter is null
* - ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the bounding box
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void getBounds(float[] bounds) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (bounds == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (bounds.length < 4) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
NSRect rect = handle.controlPointBounds();
bounds[0] = (float)/*64*/rect.x;
bounds[1] = (float)/*64*/rect.y;
bounds[2] = (float)/*64*/rect.width;
bounds[3] = (float)/*64*/rect.height;
} finally {
if (pool != null) pool.release();
}
}
/**
* Replaces the first two elements in the parameter with values that
* describe the current point of the path.
*
* @param point the array to hold the result
*
* @exception IllegalArgumentException
* - ERROR_NULL_ARGUMENT - if the parameter is null
* - ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the end point
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void getCurrentPoint(float[] point) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
if (point == null) SWT.error(SWT.ERROR_NULL_ARGUMENT);
if (point.length < 2) SWT.error(SWT.ERROR_INVALID_ARGUMENT);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
NSPoint pt = handle.currentPoint();
point[0] = (float)/*64*/pt.x;
point[1] = (float)/*64*/pt.y;
} finally {
if (pool != null) pool.release();
}
}
/**
* Returns a device independent representation of the receiver.
*
* @return the PathData for the receiver
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*
* @see PathData
*/
public PathData getPathData() {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
int count = (int)/*64*/handle.elementCount();
int pointCount = 0, typeCount = 0;
byte[] types = new byte[count];
float[] pointArray = new float[count * 6];
long /*int*/ points = OS.malloc(3 * NSPoint.sizeof);
if (points == 0) SWT.error(SWT.ERROR_NO_HANDLES);
NSPoint pt = new NSPoint();
for (int i = 0; i < count; i++) {
int element = (int)/*64*/handle.elementAtIndex(i, points);
switch (element) {
case OS.NSMoveToBezierPathElement:
types[typeCount++] = SWT.PATH_MOVE_TO;
OS.memmove(pt, points, NSPoint.sizeof);
pointArray[pointCount++] = (float)pt.x;
pointArray[pointCount++] = (float)pt.y;
break;
case OS.NSLineToBezierPathElement:
types[typeCount++] = SWT.PATH_LINE_TO;
OS.memmove(pt, points, NSPoint.sizeof);
pointArray[pointCount++] = (float)pt.x;
pointArray[pointCount++] = (float)pt.y;
break;
case OS.NSCurveToBezierPathElement:
types[typeCount++] = SWT.PATH_CUBIC_TO;
OS.memmove(pt, points, NSPoint.sizeof);
pointArray[pointCount++] = (float)pt.x;
pointArray[pointCount++] = (float)pt.y;
OS.memmove(pt, points + NSPoint.sizeof, NSPoint.sizeof);
pointArray[pointCount++] = (float)pt.x;
pointArray[pointCount++] = (float)pt.y;
OS.memmove(pt, points + NSPoint.sizeof + NSPoint.sizeof, NSPoint.sizeof);
pointArray[pointCount++] = (float)pt.x;
pointArray[pointCount++] = (float)pt.y;
break;
case OS.NSClosePathBezierPathElement:
types[typeCount++] = SWT.PATH_CLOSE;
break;
}
}
OS.free(points);
if (pointCount != pointArray.length) {
float[] temp = new float[pointCount];
System.arraycopy(pointArray, 0, temp, 0, pointCount);
pointArray = temp;
}
PathData data = new PathData();
data.types = types;
data.points = pointArray;
return data;
} finally {
if (pool != null) pool.release();
}
}
void init(PathData data) {
byte[] types = data.types;
float[] points = data.points;
for (int i = 0, j = 0; i < types.length; i++) {
switch (types[i]) {
case SWT.PATH_MOVE_TO:
moveTo(points[j++], points[j++]);
break;
case SWT.PATH_LINE_TO:
lineTo(points[j++], points[j++]);
break;
case SWT.PATH_CUBIC_TO:
cubicTo(points[j++], points[j++], points[j++], points[j++], points[j++], points[j++]);
break;
case SWT.PATH_QUAD_TO:
quadTo(points[j++], points[j++], points[j++], points[j++]);
break;
case SWT.PATH_CLOSE:
close();
break;
default:
dispose();
SWT.error(SWT.ERROR_INVALID_ARGUMENT);
}
}
}
/**
* Returns true if the Path has been disposed,
* and false otherwise.
*
* This method gets the dispose state for the Path.
* When a Path has been disposed, it is an error to
* invoke any other method (except {@link #dispose()}) using the Path.
*
* @return true when the Path is disposed, and false otherwise
*/
@Override
public boolean isDisposed() {
return handle == null;
}
/**
* Adds to the receiver a line from the current point to
* the point specified by (x, y).
*
* @param x the x coordinate of the end of the line to add
* @param y the y coordinate of the end of the line to add
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void lineTo(float x, float y) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
NSPoint pt = new NSPoint();
pt.x = x;
pt.y = y;
handle.lineToPoint(pt);
closed = false;
} finally {
if (pool != null) pool.release();
}
}
/**
* Sets the current point of the receiver to the point
* specified by (x, y). Note that this starts a new
* sub path.
*
* @param x the x coordinate of the new end point
* @param y the y coordinate of the new end point
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void moveTo(float x, float y) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
NSPoint pt = new NSPoint();
pt.x = x;
pt.y = y;
handle.moveToPoint(pt);
closed = true;
} finally {
if (pool != null) pool.release();
}
}
/**
* Adds to the receiver a quadratic curve based on the parameters.
*
* @param cx the x coordinate of the control point of the spline
* @param cy the y coordinate of the control point of the spline
* @param x the x coordinate of the end point of the spline
* @param y the y coordinate of the end point of the spline
*
* @exception SWTException
* - ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed
*
*/
public void quadTo(float cx, float cy, float x, float y) {
if (isDisposed()) SWT.error(SWT.ERROR_GRAPHIC_DISPOSED);
NSAutoreleasePool pool = null;
if (!NSThread.isMainThread()) pool = (NSAutoreleasePool) new NSAutoreleasePool().alloc().init();
try {
NSPoint current = handle.isEmpty() ? new NSPoint() : handle.currentPoint();
NSPoint ct1 = new NSPoint();
ct1.x = current.x + 2 * (cx - current.x) / 3;
ct1.y = current.y + 2 * (cy - current.y) / 3;
NSPoint ct2 = new NSPoint();
ct2.x = ct1.x + (x - current.x) / 3;
ct2.y = ct1.y + (y - current.y) / 3;
NSPoint pt = new NSPoint();
pt.x = x;
pt.y = y;
handle.curveToPoint(pt, ct1, ct2);
closed = false;
} finally {
if (pool != null) pool.release();
}
}
/**
* Returns a string containing a concise, human-readable
* description of the receiver.
*
* @return a string representation of the receiver
*/
@Override
public String toString () {
if (isDisposed()) return "Path {*DISPOSED*}";
return "Path {" + handle + "}";
}
}