| /******************************************************************************* |
| * Copyright (c) 2000, 2016 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.*; |
| import org.eclipse.swt.internal.cairo.*; |
| |
| /** |
| * 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 long /*int*/ handle; |
| |
| boolean moved, 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); |
| long /*int*/ surface = Cairo.cairo_image_surface_create(Cairo.CAIRO_FORMAT_ARGB32, 1, 1); |
| if (surface == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| handle = Cairo.cairo_create(surface); |
| Cairo.cairo_surface_destroy(surface); |
| if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| init(); |
| } |
| |
| /** |
| * 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); |
| if (path == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| if (path.isDisposed()) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| long /*int*/ surface = Cairo.cairo_image_surface_create(Cairo.CAIRO_FORMAT_ARGB32, 1, 1); |
| if (surface == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| handle = Cairo.cairo_create(surface); |
| Cairo.cairo_surface_destroy(surface); |
| if (handle == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| long /*int*/ copy; |
| flatness = Math.max(0, flatness); |
| if (flatness == 0) { |
| copy = Cairo.cairo_copy_path(path.handle); |
| } else { |
| double tolerance = Cairo.cairo_get_tolerance(path.handle); |
| Cairo.cairo_set_tolerance(path.handle, flatness); |
| copy = Cairo.cairo_copy_path_flat(path.handle); |
| Cairo.cairo_set_tolerance(path.handle, tolerance); |
| } |
| if (copy == 0) { |
| Cairo.cairo_destroy(handle); |
| SWT.error(SWT.ERROR_NO_HANDLES); |
| } |
| Cairo.cairo_append_path(handle, copy); |
| Cairo.cairo_path_destroy(copy); |
| init(); |
| } |
| |
| /** |
| * 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); |
| if (data == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| init(data); |
| } |
| |
| /** |
| * 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> pixels wide |
| * by <code>height + 1</code> pixels 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); |
| x = DPIUtil.autoScaleUp(x); |
| y = DPIUtil.autoScaleUp(y); |
| width = DPIUtil.autoScaleUp(width); |
| height = DPIUtil.autoScaleUp(height); |
| addArcInPixels(x, y, width, height, startAngle, arcAngle); |
| } |
| |
| void addArcInPixels(float x, float y, float width, float height, float startAngle, float arcAngle) { |
| moved = true; |
| if (width == height) { |
| float angle = -startAngle * (float)Math.PI / 180; |
| if (closed) Cairo.cairo_move_to(handle, (x + width / 2f) + width / 2f * Math.cos(angle), (y + height / 2f) + height / 2f * Math.sin(angle)); |
| if (arcAngle >= 0) { |
| Cairo.cairo_arc_negative(handle, x + width / 2f, y + height / 2f, width / 2f, angle, -(startAngle + arcAngle) * (float)Math.PI / 180); |
| } else { |
| Cairo.cairo_arc(handle, x + width / 2f, y + height / 2f, width / 2f, angle, -(startAngle + arcAngle) * (float)Math.PI / 180); |
| } |
| } else { |
| Cairo.cairo_save(handle); |
| Cairo.cairo_translate(handle, x + width / 2f, y + height / 2f); |
| Cairo.cairo_scale(handle, width / 2f, height / 2f); |
| float angle = -startAngle * (float)Math.PI / 180; |
| if (closed) Cairo.cairo_move_to(handle, Math.cos(angle), Math.sin(angle)); |
| if (arcAngle >= 0) { |
| Cairo.cairo_arc_negative(handle, 0, 0, 1, angle, -(startAngle + arcAngle) * (float)Math.PI / 180); |
| } else { |
| Cairo.cairo_arc(handle, 0, 0, 1, angle, -(startAngle + arcAngle) * (float)Math.PI / 180); |
| } |
| Cairo.cairo_restore(handle); |
| } |
| closed = false; |
| if (Math.abs(arcAngle) >= 360) close(); |
| } |
| |
| /** |
| * 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); |
| moved = false; |
| long /*int*/ copy = Cairo.cairo_copy_path(path.handle); |
| if (copy == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| Cairo.cairo_append_path(handle, copy); |
| Cairo.cairo_path_destroy(copy); |
| closed = path.closed; |
| } |
| |
| /** |
| * 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); |
| x = DPIUtil.autoScaleUp(x); |
| y = DPIUtil.autoScaleUp(y); |
| width = DPIUtil.autoScaleUp(width); |
| height = DPIUtil.autoScaleUp(height); |
| addRectangleInPixels(x, y, width, height); |
| } |
| |
| void addRectangleInPixels(float x, float y, float width, float height) { |
| moved = false; |
| Cairo.cairo_rectangle(handle, x, y, width, height); |
| closed = true; |
| } |
| |
| /** |
| * 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); |
| x = DPIUtil.autoScaleUp(x); |
| y = DPIUtil.autoScaleUp(y); |
| // Scale up the font |
| FontData fd = font.getFontData()[0]; |
| fd.setHeight(DPIUtil.autoScaleUp(fd.getHeight())); |
| Font scaledFont = new Font(font.getDevice(), fd); |
| addStringInPixels(string, x, y, scaledFont); |
| scaledFont.dispose(); // Dispose the scaled up font |
| } |
| void addStringInPixels(String string, float x, float y, Font font) { |
| moved = false; |
| GC.addCairoString(handle, string, x, y, font); |
| closed = true; |
| } |
| |
| /** |
| * 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); |
| Cairo.cairo_close_path(handle); |
| moved = false; |
| closed = true; |
| } |
| |
| /** |
| * 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); |
| x = DPIUtil.autoScaleUp(x); |
| y = DPIUtil.autoScaleUp(y); |
| return containsInPixels(x, y, gc, outline); |
| } |
| boolean containsInPixels(float x, float y, GC gc, boolean outline) { |
| //TODO - see Windows |
| gc.initCairo(); |
| gc.checkGC(GC.LINE_CAP | GC.LINE_JOIN | GC.LINE_STYLE | GC.LINE_WIDTH); |
| boolean result = false; |
| long /*int*/ cairo = gc.data.cairo; |
| long /*int*/ copy = Cairo.cairo_copy_path(handle); |
| if (copy == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| Cairo.cairo_append_path(cairo, copy); |
| Cairo.cairo_path_destroy(copy); |
| if (outline) { |
| result = Cairo.cairo_in_stroke(cairo, x, y) != 0; |
| } else { |
| result = Cairo.cairo_in_fill(cairo, x, y) != 0; |
| } |
| Cairo.cairo_new_path(cairo); |
| return result; |
| } |
| |
| /** |
| * 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); |
| cx1 = DPIUtil.autoScaleUp(cx1); |
| cy1 = DPIUtil.autoScaleUp(cy1); |
| cx2 = DPIUtil.autoScaleUp(cx2); |
| cy2 = DPIUtil.autoScaleUp(cy2); |
| x = DPIUtil.autoScaleUp(x); |
| y = DPIUtil.autoScaleUp(y); |
| cubicToInPixels(cx1, cy1, cx2, cy2, x, y); |
| } |
| void cubicToInPixels(float cx1, float cy1, float cx2, float cy2, float x, float y) { |
| if (!moved) { |
| double[] currentX = new double[1], currentY = new double[1]; |
| Cairo.cairo_get_current_point(handle, currentX, currentY); |
| Cairo.cairo_move_to(handle, currentX[0], currentY[0]); |
| moved = true; |
| } |
| Cairo.cairo_curve_to(handle, cx1, cy1, cx2, cy2, x, y); |
| closed = false; |
| } |
| |
| /** |
| * 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); |
| getBoundsInPixels(bounds); |
| for (int i = 0; i < bounds.length; i++) { |
| bounds [i] = DPIUtil.autoScaleDown(bounds[i]); |
| } |
| } |
| void getBoundsInPixels(float[] bounds) { |
| long /*int*/ copy = Cairo.cairo_copy_path(handle); |
| if (copy == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| cairo_path_t path = new cairo_path_t(); |
| Cairo.memmove(path, copy, cairo_path_t.sizeof); |
| double minX = 0, minY = 0, maxX = 0, maxY = 0; |
| if (path.num_data > 0) { |
| minX = minY = Double.POSITIVE_INFINITY; |
| maxX = maxY = Double.NEGATIVE_INFINITY; |
| int i = 0; |
| double[] points = new double[6]; |
| cairo_path_data_t data = new cairo_path_data_t(); |
| while (i < path.num_data) { |
| long /*int*/ offset = path.data + i * cairo_path_data_t.sizeof; |
| Cairo.memmove(data, offset, cairo_path_data_t.sizeof); |
| switch (data.type) { |
| case Cairo.CAIRO_PATH_MOVE_TO: |
| Cairo.memmove(points, offset + cairo_path_data_t.sizeof, cairo_path_data_t.sizeof); |
| minX = Math.min(minX, points[0]); |
| minY = Math.min(minY, points[1]); |
| maxX = Math.max(maxX, points[0]); |
| maxY = Math.max(maxY, points[1]); |
| break; |
| case Cairo.CAIRO_PATH_LINE_TO: |
| Cairo.memmove(points, offset + cairo_path_data_t.sizeof, cairo_path_data_t.sizeof); |
| minX = Math.min(minX, points[0]); |
| minY = Math.min(minY, points[1]); |
| maxX = Math.max(maxX, points[0]); |
| maxY = Math.max(maxY, points[1]); |
| break; |
| case Cairo.CAIRO_PATH_CURVE_TO: |
| Cairo.memmove(points, offset + cairo_path_data_t.sizeof, cairo_path_data_t.sizeof * 3); |
| minX = Math.min(minX, points[0]); |
| minY = Math.min(minY, points[1]); |
| maxX = Math.max(maxX, points[0]); |
| maxY = Math.max(maxY, points[1]); |
| minX = Math.min(minX, points[2]); |
| minY = Math.min(minY, points[3]); |
| maxX = Math.max(maxX, points[2]); |
| maxY = Math.max(maxY, points[3]); |
| minX = Math.min(minX, points[4]); |
| minY = Math.min(minY, points[5]); |
| maxX = Math.max(maxX, points[4]); |
| maxY = Math.max(maxY, points[5]); |
| break; |
| case Cairo.CAIRO_PATH_CLOSE_PATH: break; |
| } |
| i += data.length; |
| } |
| } |
| bounds[0] = (float)minX; |
| bounds[1] = (float)minY; |
| bounds[2] = (float)(maxX - minX); |
| bounds[3] = (float)(maxY - minY); |
| Cairo.cairo_path_destroy(copy); |
| } |
| |
| /** |
| * 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); |
| getCurrentPointInPixels(point); |
| for (int i = 0; i < point.length; i++) { |
| point [i] = DPIUtil.autoScaleDown(point[i]); |
| } |
| } |
| |
| void getCurrentPointInPixels(float[] point) { |
| if (point == null) SWT.error(SWT.ERROR_NULL_ARGUMENT); |
| if (point.length < 2) SWT.error(SWT.ERROR_INVALID_ARGUMENT); |
| double[] x = new double[1], y = new double[1]; |
| Cairo.cairo_get_current_point(handle, x, y); |
| point[0] = (float)x[0]; |
| point[1] = (float)y[0]; |
| } |
| |
| /** |
| * 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); |
| PathData result = getPathDataInPixels(); |
| result.points = DPIUtil.autoScaleDown(result.points); |
| return result; |
| } |
| |
| PathData getPathDataInPixels() { |
| long /*int*/ copy = Cairo.cairo_copy_path(handle); |
| if (copy == 0) SWT.error(SWT.ERROR_NO_HANDLES); |
| cairo_path_t path = new cairo_path_t(); |
| Cairo.memmove(path, copy, cairo_path_t.sizeof); |
| byte[] types = new byte[path.num_data]; |
| float[] pts = new float[path.num_data * 6]; |
| int typeIndex = 0, ptsIndex = 0; |
| if (path.num_data > 0) { |
| int i = 0; |
| double[] points = new double[6]; |
| cairo_path_data_t data = new cairo_path_data_t(); |
| while (i < path.num_data) { |
| long /*int*/ offset = path.data + i * cairo_path_data_t.sizeof; |
| Cairo.memmove(data, offset, cairo_path_data_t.sizeof); |
| switch (data.type) { |
| case Cairo.CAIRO_PATH_MOVE_TO: |
| types[typeIndex++] = SWT.PATH_MOVE_TO; |
| Cairo.memmove(points, offset + cairo_path_data_t.sizeof, cairo_path_data_t.sizeof); |
| pts[ptsIndex++] = (float)points[0]; |
| pts[ptsIndex++] = (float)points[1]; |
| break; |
| case Cairo.CAIRO_PATH_LINE_TO: |
| types[typeIndex++] = SWT.PATH_LINE_TO; |
| Cairo.memmove(points, offset + cairo_path_data_t.sizeof, cairo_path_data_t.sizeof); |
| pts[ptsIndex++] = (float)points[0]; |
| pts[ptsIndex++] = (float)points[1]; |
| break; |
| case Cairo.CAIRO_PATH_CURVE_TO: |
| types[typeIndex++] = SWT.PATH_CUBIC_TO; |
| Cairo.memmove(points, offset + cairo_path_data_t.sizeof, cairo_path_data_t.sizeof * 3); |
| pts[ptsIndex++] = (float)points[0]; |
| pts[ptsIndex++] = (float)points[1]; |
| pts[ptsIndex++] = (float)points[2]; |
| pts[ptsIndex++] = (float)points[3]; |
| pts[ptsIndex++] = (float)points[4]; |
| pts[ptsIndex++] = (float)points[5]; |
| break; |
| case Cairo.CAIRO_PATH_CLOSE_PATH: |
| types[typeIndex++] = SWT.PATH_CLOSE; |
| break; |
| } |
| i += data.length; |
| } |
| } |
| if (typeIndex != types.length) { |
| byte[] newTypes = new byte[typeIndex]; |
| System.arraycopy(types, 0, newTypes, 0, typeIndex); |
| types = newTypes; |
| } |
| if (ptsIndex != pts.length) { |
| float[] newPts = new float[ptsIndex]; |
| System.arraycopy(pts, 0, newPts, 0, ptsIndex); |
| pts = newPts; |
| } |
| Cairo.cairo_path_destroy(copy); |
| PathData result = new PathData(); |
| result.types = types; |
| result.points = pts; |
| return result; |
| } |
| |
| /** |
| * 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); |
| x = DPIUtil.autoScaleUp(x); |
| y = DPIUtil.autoScaleUp(y); |
| lineToInPixels(x, y); |
| } |
| void lineToInPixels(float x, float y) { |
| if (!moved) { |
| double[] currentX = new double[1], currentY = new double[1]; |
| Cairo.cairo_get_current_point(handle, currentX, currentY); |
| Cairo.cairo_move_to(handle, currentX[0], currentY[0]); |
| moved = true; |
| } |
| Cairo.cairo_line_to(handle, x, y); |
| closed = false; |
| } |
| |
| /** |
| * 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); |
| x = DPIUtil.autoScaleUp(x); |
| y = DPIUtil.autoScaleUp(y); |
| moveToInPixels(x, y); |
| } |
| void moveToInPixels(float x, float y) { |
| /* |
| * Bug in Cairo. If cairo_move_to() is not called at the |
| * begining of a subpath, the first cairo_line_to() or |
| * cairo_curve_to() segment do not output anything. The fix |
| * is to detect that the app did not call cairo_move_to() |
| * before those calls and call it explicitly. |
| */ |
| moved = true; |
| Cairo.cairo_move_to(handle, x, y); |
| closed = true; |
| } |
| |
| /** |
| * 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); |
| x = DPIUtil.autoScaleUp(x); |
| y = DPIUtil.autoScaleUp(y); |
| cx = DPIUtil.autoScaleUp(cx); |
| cy = DPIUtil.autoScaleUp(cy); |
| quadToInPixels(cx, cy, x, y); |
| } |
| void quadToInPixels(float cx, float cy, float x, float y) { |
| double[] currentX = new double[1], currentY = new double[1]; |
| Cairo.cairo_get_current_point(handle, currentX, currentY); |
| if (!moved) { |
| Cairo.cairo_move_to(handle, currentX[0], currentY[0]); |
| moved = true; |
| } |
| float x0 = (float)currentX[0]; |
| float y0 = (float)currentY[0]; |
| float cx1 = x0 + 2 * (cx - x0) / 3; |
| float cy1 = y0 + 2 * (cy - y0) / 3; |
| float cx2 = cx1 + (x - x0) / 3; |
| float cy2 = cy1 + (y - y0) / 3; |
| Cairo.cairo_curve_to(handle, cx1, cy1, cx2, cy2, x, y); |
| closed = false; |
| } |
| |
| @Override |
| void destroy() { |
| Cairo.cairo_destroy(handle); |
| handle = 0; |
| } |
| |
| 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 == 0; |
| } |
| |
| /** |
| * 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 + "}"; |
| } |
| |
| } |