1 /*******************************************************************************
2 * Copyright (c) 2006, 2016 IBM Corporation and others.
3 *
4 * This program and the accompanying materials
5 * are made available under the terms of the Eclipse Public License 2.0
6 * which accompanies this distribution, and is available at
7 * https://www.eclipse.org/legal/epl-2.0/
8 *
9 * SPDX-License-Identifier: EPL-2.0
10 *
11 * Contributors:
12 * IBM Corporation - initial API and implementation
13 *******************************************************************************/
14
15 package org.eclipse.swt.examples.graphics;
16
17 import org.eclipse.swt.SWT;
18 import org.eclipse.swt.graphics.Device;
19 import org.eclipse.swt.graphics.Font;
20 import org.eclipse.swt.graphics.GC;
21 import org.eclipse.swt.graphics.Path;
22 import org.eclipse.swt.graphics.Pattern;
23 import org.eclipse.swt.graphics.Point;
24 import org.eclipse.swt.graphics.Rectangle;
25 import org.eclipse.swt.layout.GridLayout;
26 import org.eclipse.swt.widgets.Button;
27 import org.eclipse.swt.widgets.Combo;
28 import org.eclipse.swt.widgets.Composite;
29 import org.eclipse.swt.widgets.Label;
30 import org.eclipse.swt.widgets.Menu;
31
32 /**
33 * This tab demonstrates how to apply a path clipping and the effects of
34 * applying one.
35 */
36 public class PathClippingTab extends GraphicsTab {
37
38 private Combo clippingCb;
39 private Button colorButton;
40 private GraphicsBackground background;
41 private Menu menu;
42
PathClippingTab(GraphicsExample example)43 public PathClippingTab(GraphicsExample example) {
44 super(example);
45 }
46
47 @Override
getCategory()48 public String getCategory() {
49 return GraphicsExample.getResourceString("Clipping"); //$NON-NLS-1$
50 }
51
52 @Override
getText()53 public String getText() {
54 return GraphicsExample.getResourceString("PathClipping"); //$NON-NLS-1$
55 }
56
57 @Override
getDescription()58 public String getDescription() {
59 return GraphicsExample.getResourceString("PathClippingDesc"); //$NON-NLS-1$
60 }
61
62 @Override
dispose()63 public void dispose() {
64 if (menu != null) {
65 menu.dispose();
66 menu = null;
67 }
68 }
69
70 /**
71 * Creates the widgets used to control the drawing.
72 */
73 @Override
createControlPanel(Composite parent)74 public void createControlPanel(Composite parent) {
75
76 // create drop down combo for choosing clipping
77 Composite comp = new Composite(parent, SWT.NONE);
78 comp.setLayout(new GridLayout(2, false));
79
80 new Label(comp, SWT.CENTER).setText(GraphicsExample
81 .getResourceString("Clipping")); //$NON-NLS-1$
82 clippingCb = new Combo(comp, SWT.DROP_DOWN);
83 clippingCb.add(GraphicsExample.getResourceString("Circles")); //$NON-NLS-1$
84 clippingCb.add(GraphicsExample.getResourceString("Rectangle")); //$NON-NLS-1$
85 clippingCb.add(GraphicsExample.getResourceString("Oval")); //$NON-NLS-1$
86 clippingCb.add(GraphicsExample.getResourceString("Word")); //$NON-NLS-1$
87 clippingCb.add(GraphicsExample.getResourceString("Star")); //$NON-NLS-1$
88 clippingCb.add(GraphicsExample.getResourceString("Triangles")); //$NON-NLS-1$
89 clippingCb.add(GraphicsExample.getResourceString("Default")); //$NON-NLS-1$
90 clippingCb.select(0);
91 clippingCb.addListener(SWT.Selection, event -> example.redraw());
92
93 // color menu
94 ColorMenu cm = new ColorMenu();
95 cm.setPatternItems(example.checkAdvancedGraphics());
96 menu = cm.createMenu(parent.getParent(), gb -> {
97 background = gb;
98 colorButton.setImage(gb.getThumbNail());
99 example.redraw();
100 });
101
102 // initialize the background to the 5th item in the menu (blue)
103 background =(GraphicsBackground)menu.getItem(4).getData();
104
105 // color button
106 comp = new Composite(parent, SWT.NONE);
107 comp.setLayout(new GridLayout(2, false));
108
109 colorButton = new Button(comp, SWT.PUSH);
110 colorButton.setText(GraphicsExample
111 .getResourceString("Color")); //$NON-NLS-1$
112 colorButton.setImage(background.getThumbNail());
113 colorButton.addListener(SWT.Selection, event -> {
114 final Button button = (Button) event.widget;
115 final Composite parent1 = button.getParent();
116 Rectangle bounds = button.getBounds();
117 Point point = parent1.toDisplay(new Point(bounds.x, bounds.y));
118 menu.setLocation(point.x, point.y + bounds.height);
119 menu.setVisible(true);
120 });
121 }
122 @Override
paint(GC gc, int width, int height)123 public void paint(GC gc, int width, int height) {
124 if (!example.checkAdvancedGraphics()) return;
125 Device device = gc.getDevice();
126
127 int clipping = clippingCb.getSelectionIndex();
128 switch (clipping) {
129
130 case 0: // circles
131 Path path = new Path(device);
132 path.addArc((width-width/5)/2, (height-height/5)/2, width/5, height/5, 0, 360);
133 path.addArc(5*(width-width/8)/12, 4*(height-height/8)/12, width/8, height/8, 0, 360);
134 path.addArc(7*(width-width/8)/12, 8*(height-height/8)/12, width/8, height/8, 0, 360);
135 path.addArc(6*(width-width/12)/12, 3*(height-height/12)/12, width/12, height/12, 0, 360);
136 path.addArc(6*(width-width/12)/12, 9*(height-height/12)/12, width/12, height/12, 0, 360);
137 path.addArc(11.5f*(width-width/18)/20, 5*(height-height/18)/18, width/18, height/18, 0, 360);
138 path.addArc(8.5f*(width-width/18)/20, 13*(height-height/18)/18, width/18, height/18, 0, 360);
139 gc.setClipping(path);
140 path.dispose();
141 break;
142 case 1: // rectangle
143 path = new Path(device);
144 path.addRectangle(100, 100, width-200, height-200);
145 path.addRectangle(120, 120, width-240, height-240);
146 path.addRectangle(140, 140, width-280, height-280);
147 gc.setClipping(path);
148 path.dispose();
149 break;
150 case 2: // circle
151 path = new Path(device);
152 path.addArc(100, 100, width-200, height-200, 0, 360);
153 path.addArc((width-width/5)/2, (height-height/5)/2, width/5, height/5, 0, 360);
154 path.addArc(5*(width-width/8)/12, 4*(height-height/8)/12, width/8, height/8, 0, 360);
155 path.addArc(7*(width-width/8)/12, 8*(height-height/8)/12, width/8, height/8, 0, 360);
156 path.addArc(6*(width-width/12)/12, 3*(height-height/12)/12, width/12, height/12, 0, 360);
157 path.addArc(6*(width-width/12)/12, 9*(height-height/12)/12, width/12, height/12, 0, 360);
158 path.addArc(11.5f*(width-width/18)/20, 5*(height-height/18)/18, width/18, height/18, 0, 360);
159 path.addArc(8.5f*(width-width/18)/20, 13*(height-height/18)/18, width/18, height/18, 0, 360);
160 gc.setClipping(path);
161 path.dispose();
162 break;
163 case 3: // word
164 path = new Path(device);
165 String text = GraphicsExample.getResourceString("SWT"); //$NON-NLS-1$
166 Font font = new Font(device, "Times", 200, SWT.NORMAL);
167 gc.setFont(font);
168 Point size = gc.stringExtent(text);
169 path.addString(text, (width-size.x)/2, (height-size.y)/2, font);
170 font.dispose();
171 gc.setClipping(path);
172 path.dispose();
173 break;
174 case 4: // star
175 path = new Path(device);
176 path.lineTo(width/2, 0);
177 path.lineTo(5*width/8, height/3);
178 path.lineTo(width, height/3);
179 path.lineTo(3*width/4, 10*height/16);
180 path.lineTo(7*width/8, height);
181 path.lineTo(width/2, 3*height/4);
182 path.lineTo(width/8, height);
183 path.lineTo(width/4, 10*height/16);
184 path.lineTo(0, height/3);
185 path.lineTo(3*width/8, height/3);
186 path.lineTo(width/2, 0);
187
188 Path ovalPath = new Path(device);
189 ovalPath.addArc(90, 90, width-180, height-180, 0, 360);
190
191 path.addPath(ovalPath);
192 gc.setClipping(path);
193 ovalPath.dispose();
194 path.dispose();
195 break;
196 case 5: // triangles
197 path = new Path(device);
198 path.addRectangle(0, 0, width, height);
199 path.lineTo(width/4, 0);
200 path.lineTo(width/4, height/2);
201 path.lineTo(0, height/2);
202 path.lineTo(width/4, 0);
203
204 Path path2 = new Path(device);
205 path2.lineTo(width/2, 0);
206 path2.lineTo(width/4, height/2);
207 path2.lineTo(3*width/4, height/2);
208 path2.lineTo(width/2, 0);
209
210 Path path3 = new Path(device);
211 path3.lineTo(3*width/4, 0);
212 path3.lineTo(3*width/4, height/2);
213 path3.lineTo(width, height/2);
214 path3.lineTo(3*width/4, 0);
215
216 Path path4 = new Path(device);
217 path4.lineTo(0, height);
218 path4.lineTo(width/4, height/2);
219 path4.lineTo(width/2, height);
220 path4.lineTo(0, height);
221
222 Path path5 = new Path(device);
223 path5.lineTo(width/2, height);
224 path5.lineTo(3*width/4, height/2);
225 path5.lineTo(width, height);
226 path5.lineTo(width/2, height);
227
228 path.addPath(path2);
229 path.addPath(path3);
230 path.addPath(path4);
231 path.addPath(path5);
232 gc.setClipping(path);
233
234 path5.dispose();
235 path4.dispose();
236 path3.dispose();
237 path2.dispose();
238 path.dispose();
239 break;
240 case 6: // default
241 gc.setClipping(0, 0, width, height);
242 break;
243 }
244
245 Pattern pattern = null;
246 if (background.getBgColor1() != null) {
247 gc.setBackground(background.getBgColor1());
248 } else if (background.getBgImage() != null) {
249 pattern = new Pattern(device, background.getBgImage());
250 gc.setBackgroundPattern(pattern);
251 }
252 gc.fillRectangle(0, 0, width, height);
253 if (pattern != null) pattern.dispose();
254 }
255 }
256