Java tutorial
/******************************************************************************* * Copyright (c) 2000, 2017 IBM Corporation and others. * * This program and the accompanying materials * are made available under the terms of the Eclipse Public License 2.0 * which accompanies this distribution, and is available at * https://www.eclipse.org/legal/epl-2.0/ * * SPDX-License-Identifier: EPL-2.0 * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.swt.graphics; import org.eclipse.swt.*; import org.eclipse.swt.internal.*; 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. * <p> * Application code must explicitly invoke the <code>Path.dispose()</code> * method to release the operating system resources managed by each instance * when those instances are no longer required. * </p> * <p> * This class requires the operating system's advanced graphics subsystem * which may not be available on some platforms. * </p> * * @see <a href="http://www.eclipse.org/swt/snippets/#path">Path, Pattern snippets</a> * @see <a href="http://www.eclipse.org/swt/examples.php">SWT Example: GraphicsExample</a> * @see <a href="http://www.eclipse.org/swt/">Sample code and further information</a> * * @since 3.1 */ public class Path extends Resource { /** * the OS resource for the Path * (Warning: This field is platform dependent) * <p> * <b>IMPORTANT:</b> This field is <em>not</em> 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. * </p> * * @noreference This field is not intended to be referenced by clients. */ public NSBezierPath handle; boolean closed = true; /** * Constructs a new empty Path. * <p> * This operation requires the operating system's advanced * graphics subsystem which may not be available on some * platforms. * </p> * <p> * You must dispose the path when it is no longer required. * </p> * * @param device the device on which to allocate the path * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the device is null and there is no current device</li> * </ul> * @exception SWTException <ul> * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li> * </ul> * @exception SWTError <ul> * <li>ERROR_NO_HANDLES if a handle for the path could not be obtained</li> * </ul> * * @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 <code>path</code>. If * <code>flatness</code> 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. * <p> * This operation requires the operating system's advanced * graphics subsystem which may not be available on some * platforms. * </p> * <p> * You must dispose the path when it is no longer required. * </p> * * @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 <ul> * <li>ERROR_NULL_ARGUMENT - if the device is null and there is no current device</li> * <li>ERROR_NULL_ARGUMENT - if the path is null</li> * <li>ERROR_INVALID_ARGUMENT - if the path has been disposed</li> * </ul> * @exception SWTException <ul> * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li> * </ul> * @exception SWTError <ul> * <li>ERROR_NO_HANDLES if a handle for the path could not be obtained</li> * </ul> * * @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 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. * <p> * This operation requires the operating system's advanced * graphics subsystem which may not be available on some * platforms. * </p> * <p> * You must dispose the path when it is no longer required. * </p> * * @param device the device on which to allocate the path * @param data the data for the path * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the device is null and there is no current device</li> * <li>ERROR_NULL_ARGUMENT - if the data is null</li> * </ul> * @exception SWTException <ul> * <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available</li> * </ul> * @exception SWTError <ul> * <li>ERROR_NO_HANDLES if a handle for the path could not be obtained</li> * </ul> * * @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. * <p> * The resulting arc begins at <code>startAngle</code> and extends * for <code>arcAngle</code> 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. * </p><p> * The center of the arc is the center of the rectangle whose origin * is (<code>x</code>, <code>y</code>) and whose size is specified by the * <code>width</code> and <code>height</code> arguments. * </p><p> * The resulting arc covers an area <code>width + 1</code> points wide * by <code>height + 1</code> points tall. * </p> * * @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 <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ 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) path.elementCount(); long points = C.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) 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; } } C.free(points); } /** * Adds to the receiver the path described by the parameter. * * @param path the path to add to the receiver * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li> * <li>ERROR_INVALID_ARGUMENT - if the parameter has been disposed</li> * </ul> * @exception SWTException <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ 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 <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ 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 <ul> * <li>ERROR_NULL_ARGUMENT - if the font is null</li> * <li>ERROR_INVALID_ARGUMENT - if the font has been disposed</li> * </ul> * @exception SWTException <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ 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 glyphs = C.malloc((range.length + 1) * 4); long 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); } C.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 <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ 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 <code>true</code> if the specified point is contained by * the receiver and false otherwise. * <p> * If outline is <code>true</code>, the point (x, y) checked for containment in * the receiver's outline. If outline is <code>false</code>, 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 <code>true</code> if the path contains the point and <code>false</code> otherwise * * @exception IllegalArgumentException <ul> * <li>ERROR_NULL_ARGUMENT - if the gc is null</li> * <li>ERROR_INVALID_ARGUMENT - if the gc has been disposed</li> * </ul> * @exception SWTException <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ 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 pixel = C.malloc(4); if (pixel == 0) SWT.error(SWT.ERROR_NO_HANDLES); int[] buffer = new int[] { 0xFFFFFFFF }; C.memmove(pixel, buffer, 4); long colorspace = OS.CGColorSpaceCreateDeviceRGB(); long context = OS.CGBitmapContextCreate(pixel, 1, 1, 8, 4, colorspace, OS.kCGImageAlphaNoneSkipFirst); OS.CGColorSpaceRelease(colorspace); if (context == 0) { C.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 path = GC.createCGPathRef(handle); OS.CGContextAddPath(context, path); OS.CGPathRelease(path); OS.CGContextStrokePath(context); OS.CGContextRelease(context); C.memmove(buffer, pixel, 4); C.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 <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ 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 <ul> * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li> * <li>ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the bounding box</li> * </ul> * @exception SWTException <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ 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) rect.x; bounds[1] = (float) rect.y; bounds[2] = (float) rect.width; bounds[3] = (float) 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 <ul> * <li>ERROR_NULL_ARGUMENT - if the parameter is null</li> * <li>ERROR_INVALID_ARGUMENT - if the parameter is too small to hold the end point</li> * </ul> * @exception SWTException <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ 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) pt.x; point[1] = (float) pt.y; } finally { if (pool != null) pool.release(); } } /** * Returns a device independent representation of the receiver. * * @return the PathData for the receiver * * @exception SWTException <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> * * @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) handle.elementCount(); int pointCount = 0, typeCount = 0; byte[] types = new byte[count]; float[] pointArray = new float[count * 6]; long points = C.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) 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; } } C.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 <code>true</code> if the Path has been disposed, * and <code>false</code> otherwise. * <p> * 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 <code>true</code> when the Path is disposed, and <code>false</code> 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 <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ 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 <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ 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 <ul> * <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been disposed</li> * </ul> */ 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 + "}"; } }