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.graphics.Device;
18 import org.eclipse.swt.graphics.GC;
19 import org.eclipse.swt.graphics.Image;
20 import org.eclipse.swt.graphics.Rectangle;
21 import org.eclipse.swt.graphics.Transform;
22
23 /**
24 * This tab demonstrates various transformations, such as scaling, rotation, and
25 * translation.
26 */
27 public class CardsTab extends AnimatedGraphicsTab {
28
29 float movClubX, movClubY, movDiamondX, movDiamondY, movHeart, movSpade;
30 float inc_club = 5.0f;
31 float inc_diamond = 5.0f;
32 float inc_hearts = 5.0f;
33 float inc_spade = 5.0f;
34 float scale, scaleWidth;
35 int rotationAngle = 0;
36 float scaleArg = 0;
37 float heartScale = 0.5f;
38 float spadeScale = 0.333f;
39 int clubWidth, diamondWidth, heartWidth, spadeHeight;
40
41 Image ace_club, ace_spade, ace_diamond, ace_hearts;
42
43 /**
44 * Constructor
45 * @param example A GraphicsExample
46 */
CardsTab(GraphicsExample example)47 public CardsTab(GraphicsExample example) {
48 super(example);
49 }
50
51 @Override
getCategory()52 public String getCategory() {
53 return GraphicsExample.getResourceString("Transform"); //$NON-NLS-1$
54 }
55
56 @Override
getText()57 public String getText() {
58 return GraphicsExample.getResourceString("Cards"); //$NON-NLS-1$
59 }
60
61 @Override
getDescription()62 public String getDescription() {
63 return GraphicsExample.getResourceString("CardsDescription"); //$NON-NLS-1$
64 }
65
66 @Override
dispose()67 public void dispose() {
68 if (ace_club != null) {
69 ace_club.dispose();
70 ace_club = null;
71 ace_spade.dispose();
72 ace_spade = null;
73 ace_diamond.dispose();
74 ace_diamond = null;
75 ace_hearts.dispose();
76 ace_hearts = null;
77 }
78 }
79 @Override
next(int width, int height)80 public void next(int width, int height) {
81 rotationAngle = (rotationAngle+10)%360;
82
83 // scaleVal goes from 0 to 1, then 1 to 0, then starts over
84 scaleArg = (float)((scaleArg == 1) ? scaleArg - 0.1 : scaleArg + 0.1);
85 scale = (float)Math.cos(scaleArg);
86
87 movClubX += inc_club;
88 movDiamondX += inc_diamond;
89 movHeart += inc_hearts;
90 movSpade += inc_spade;
91
92 scaleWidth = (float) ((movClubY/height)*0.35 + 0.15);
93 movClubY = 2*height/5 * (float)Math.sin(0.01*movClubX - 90) + 2*height/5;
94 movDiamondY = 2*height/5 * (float)Math.cos(0.01*movDiamondX) + 2*height/5;
95
96 if (movClubX + clubWidth*scaleWidth > width) {
97 movClubX = width - clubWidth*scaleWidth;
98 inc_club = -inc_club;
99 }
100 if (movClubX < 0) {
101 movClubX = 0;
102 inc_club = -inc_club;
103 }
104 if (movDiamondX + diamondWidth*scaleWidth > width) {
105 movDiamondX = width - diamondWidth*scaleWidth;
106 inc_diamond = -inc_diamond;
107 }
108 if (movDiamondX < 0) {
109 movDiamondX = 0;
110 inc_diamond = -inc_diamond;
111 }
112 if (movHeart + heartWidth*heartScale > width) {
113 movHeart = width - heartWidth*heartScale;
114 inc_hearts = -inc_hearts;
115 }
116 if (movHeart < 0) {
117 movHeart = 0;
118 inc_hearts = -inc_hearts;
119 }
120 if (movSpade + spadeHeight*spadeScale > height) {
121 movSpade = height - spadeHeight*spadeScale;
122 inc_spade = -inc_spade;
123 }
124 if (movSpade < 0) {
125 movSpade = 0;
126 inc_spade = -inc_spade;
127 }
128 }
129
130 @Override
paint(GC gc, int width, int height)131 public void paint(GC gc, int width, int height) {
132 if (!example.checkAdvancedGraphics()) return;
133 Device device = gc.getDevice();
134
135 if (ace_club == null) {
136 ace_club = GraphicsExample.loadImage(device, GraphicsExample.class, "ace_club.jpg");
137 ace_spade = GraphicsExample.loadImage(device, GraphicsExample.class, "ace_spade.jpg");
138 ace_diamond = GraphicsExample.loadImage(device, GraphicsExample.class, "ace_diamond.jpg");
139 ace_hearts = GraphicsExample.loadImage(device, GraphicsExample.class, "ace_hearts.jpg");
140 }
141
142 clubWidth = ace_club.getBounds().width;
143 diamondWidth = ace_diamond.getBounds().width;
144 heartWidth = ace_hearts.getBounds().width;
145 spadeHeight = ace_spade.getBounds().height;
146
147 Transform transform;
148
149 // ace of clubs
150 transform = new Transform(device);
151 transform.translate((int)movClubX, (int)movClubY);
152 transform.scale(scaleWidth, scaleWidth);
153
154 // rotate on center of image
155 Rectangle rect = ace_club.getBounds();
156 transform.translate(rect.width/2, rect.height/2);
157 transform.rotate(rotationAngle);
158 transform.translate(-rect.width/2, -rect.height/2);
159
160 gc.setTransform(transform);
161 transform.dispose();
162 gc.drawImage(ace_club, 0, 0);
163
164 // ace of diamonds
165 transform = new Transform(device);
166 transform.translate((int)movDiamondX, (int)movDiamondY);
167 transform.scale(scaleWidth, scaleWidth);
168 gc.setTransform(transform);
169 transform.dispose();
170 gc.drawImage(ace_diamond, 0, 0);
171
172 // ace of hearts
173 transform = new Transform(device);
174 transform.translate(movHeart, height/2);
175 transform.scale(heartScale, 0.5f*scale);
176 gc.setTransform(transform);
177 transform.dispose();
178 gc.drawImage(ace_hearts, 0, 0);
179
180 // ace of spades
181 transform = new Transform(device);
182 transform.translate(movSpade, movSpade);
183 transform.scale(0.5f*scale, spadeScale);
184 gc.setTransform(transform);
185 transform.dispose();
186 gc.drawImage(ace_spade, 0, 0);
187 }
188 }
189
190