Source Code Cross Referenced for SWTUtils.java in  » Chart » jfreechart » org » jfree » experimental » swt » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Chart » jfreechart » org.jfree.experimental.swt 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ===========================================================
002:         * JFreeChart : a free chart library for the Java(tm) platform
003:         * ===========================================================
004:         *
005:         * (C) Copyright 2000-2007, by Object Refinery Limited and Contributors.
006:         *
007:         * Project Info:  http://www.jfree.org/jfreechart/index.html
008:         *
009:         * This library is free software; you can redistribute it and/or modify it 
010:         * under the terms of the GNU Lesser General Public License as published by 
011:         * the Free Software Foundation; either version 2.1 of the License, or 
012:         * (at your option) any later version.
013:         *
014:         * This library is distributed in the hope that it will be useful, but 
015:         * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 
016:         * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public 
017:         * License for more details.
018:         *
019:         * You should have received a copy of the GNU Lesser General Public
020:         * License along with this library; if not, write to the Free Software
021:         * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, 
022:         * USA.  
023:         *
024:         * [Java is a trademark or registered trademark of Sun Microsystems, Inc. 
025:         * in the United States and other countries.]
026:         *
027:         * -------------
028:         * SWTUtils.java
029:         * -------------
030:         * (C) Copyright 2006, 2007, by Henry Proudhon and Contributors.
031:         *
032:         * Original Author:  Henry Proudhon (henry.proudhon AT insa-lyon.fr);
033:         * Contributor(s):   Rainer Blessing;
034:         *                   David Gilbert (david.gilbert@object-refinery.com)
035:         *
036:         * Changes
037:         * -------
038:         * 01-Aug-2006 : New class (HP);
039:         * 16-Jan-2007 : Use FontData.getHeight() instead of direct field access (RB); 
040:         * 31-Jan-2007 : moved the dummy JPanel from SWTGraphics2D.java, 
041:         *               added a new convert method for mouse events (HP);
042:         */
043:
044:        package org.jfree.experimental.swt;
045:
046:        import java.awt.event.MouseEvent;
047:        import java.awt.geom.Point2D;
048:        import java.awt.geom.Rectangle2D;
049:
050:        import javax.swing.JPanel;
051:
052:        import org.eclipse.swt.SWT;
053:        import org.eclipse.swt.graphics.Color;
054:        import org.eclipse.swt.graphics.Device;
055:        import org.eclipse.swt.graphics.Font;
056:        import org.eclipse.swt.graphics.FontData;
057:        import org.eclipse.swt.graphics.GC;
058:        import org.eclipse.swt.graphics.Point;
059:        import org.eclipse.swt.graphics.Rectangle;
060:
061:        /**
062:         * Utility class gathering some useful and general method.
063:         * Mainly convert forth and back graphical stuff between 
064:         * awt and swt.
065:         */
066:        public class SWTUtils {
067:
068:            private final static String Az = "ABCpqr";
069:
070:            /** A dummy JPanel used to provide font metrics. */
071:            protected static final JPanel DUMMY_PANEL = new JPanel();
072:
073:            /**
074:             * Create a <code>FontData</code> object which encapsulate 
075:             * the essential data to create a swt font. The data is taken 
076:             * from the provided awt Font.
077:             * <p>Generally speaking, given a font size, the returned swt font 
078:             * will display differently on the screen than the awt one.
079:             * Because the SWT toolkit use native graphical ressources whenever 
080:             * it is possible, this fact is plateform dependent. To address 
081:             * this issue, it is possible to enforce the method to return 
082:             * a font with the same size (or at least as close as possible) 
083:             * as the awt one.
084:             * <p>When the object is no more used, the user must explicitely 
085:             * call the dispose method on the returned font to free the 
086:             * operating system resources (the garbage collector won't do it).
087:             * 
088:             * @param device The swt device to draw on (display or gc device).
089:             * @param font The awt font from which to get the data.
090:             * @param ensureSameSize A boolean used to enforce the same size 
091:             * (in pixels) between the awt font and the newly created swt font.
092:             * @return a <code>FontData</code> object.
093:             */
094:            public static FontData toSwtFontData(Device device,
095:                    java.awt.Font font, boolean ensureSameSize) {
096:                FontData fontData = new FontData();
097:                fontData.setName(font.getFamily());
098:                int style = SWT.NORMAL;
099:                switch (font.getStyle()) {
100:                case java.awt.Font.PLAIN:
101:                    style |= SWT.NORMAL;
102:                    break;
103:                case java.awt.Font.BOLD:
104:                    style |= SWT.BOLD;
105:                    break;
106:                case java.awt.Font.ITALIC:
107:                    style |= SWT.ITALIC;
108:                    break;
109:                case (java.awt.Font.ITALIC + java.awt.Font.BOLD):
110:                    style |= SWT.ITALIC | SWT.BOLD;
111:                    break;
112:                }
113:                fontData.setStyle(style);
114:                // convert the font size (in pt for awt) to height in pixels for swt
115:                int height = (int) Math.round(font.getSize() * 72.0
116:                        / device.getDPI().y);
117:                fontData.setHeight(height);
118:                // hack to ensure the newly created swt fonts will be rendered with the
119:                // same height as the awt one
120:                if (ensureSameSize) {
121:                    GC tmpGC = new GC(device);
122:                    Font tmpFont = new Font(device, fontData);
123:                    tmpGC.setFont(tmpFont);
124:                    if (tmpGC.textExtent(Az).x > DUMMY_PANEL.getFontMetrics(
125:                            font).stringWidth(Az)) {
126:                        while (tmpGC.textExtent(Az).x > DUMMY_PANEL
127:                                .getFontMetrics(font).stringWidth(Az)) {
128:                            tmpFont.dispose();
129:                            height--;
130:                            fontData.setHeight(height);
131:                            tmpFont = new Font(device, fontData);
132:                            tmpGC.setFont(tmpFont);
133:                        }
134:                    } else if (tmpGC.textExtent(Az).x < DUMMY_PANEL
135:                            .getFontMetrics(font).stringWidth(Az)) {
136:                        while (tmpGC.textExtent(Az).x < DUMMY_PANEL
137:                                .getFontMetrics(font).stringWidth(Az)) {
138:                            tmpFont.dispose();
139:                            height++;
140:                            fontData.setHeight(height);
141:                            tmpFont = new Font(device, fontData);
142:                            tmpGC.setFont(tmpFont);
143:                        }
144:                    }
145:                    tmpFont.dispose();
146:                    tmpGC.dispose();
147:                }
148:                return fontData;
149:            }
150:
151:            /**
152:             * Create an awt font by converting as much information 
153:             * as possible from the provided swt <code>FontData</code>.
154:             * <p>Generally speaking, given a font size, an swt font will 
155:             * display differently on the screen than the corresponding awt 
156:             * one. Because the SWT toolkit use native graphical ressources whenever 
157:             * it is possible, this fact is plateform dependent. To address 
158:             * this issue, it is possible to enforce the method to return 
159:             * an awt font with the same height as the swt one.
160:             * 
161:             * @param device The swt device being drawn on (display or gc device).
162:             * @param fontData The swt font to convert.
163:             * @param ensureSameSize A boolean used to enforce the same size 
164:             * (in pixels) between the swt font and the newly created awt font.
165:             * @return An awt font converted from the provided swt font.
166:             */
167:            public static java.awt.Font toAwtFont(Device device,
168:                    FontData fontData, boolean ensureSameSize) {
169:                int style;
170:                switch (fontData.getStyle()) {
171:                case SWT.NORMAL:
172:                    style = java.awt.Font.PLAIN;
173:                    break;
174:                case SWT.ITALIC:
175:                    style = java.awt.Font.ITALIC;
176:                    break;
177:                case SWT.BOLD:
178:                    style = java.awt.Font.BOLD;
179:                    break;
180:                default:
181:                    style = java.awt.Font.PLAIN;
182:                    break;
183:                }
184:                int height = (int) Math.round(fontData.getHeight()
185:                        * device.getDPI().y / 72.0);
186:                // hack to ensure the newly created awt fonts will be rendered with the
187:                // same height as the swt one
188:                if (ensureSameSize) {
189:                    GC tmpGC = new GC(device);
190:                    Font tmpFont = new Font(device, fontData);
191:                    tmpGC.setFont(tmpFont);
192:                    JPanel DUMMY_PANEL = new JPanel();
193:                    java.awt.Font tmpAwtFont = new java.awt.Font(fontData
194:                            .getName(), style, height);
195:                    if (DUMMY_PANEL.getFontMetrics(tmpAwtFont).stringWidth(Az) > tmpGC
196:                            .textExtent(Az).x) {
197:                        while (DUMMY_PANEL.getFontMetrics(tmpAwtFont)
198:                                .stringWidth(Az) > tmpGC.textExtent(Az).x) {
199:                            height--;
200:                            tmpAwtFont = new java.awt.Font(fontData.getName(),
201:                                    style, height);
202:                        }
203:                    } else if (DUMMY_PANEL.getFontMetrics(tmpAwtFont)
204:                            .stringWidth(Az) < tmpGC.textExtent(Az).x) {
205:                        while (DUMMY_PANEL.getFontMetrics(tmpAwtFont)
206:                                .stringWidth(Az) < tmpGC.textExtent(Az).x) {
207:                            height++;
208:                            tmpAwtFont = new java.awt.Font(fontData.getName(),
209:                                    style, height);
210:                        }
211:                    }
212:                    tmpFont.dispose();
213:                    tmpGC.dispose();
214:                }
215:                return new java.awt.Font(fontData.getName(), style, height);
216:            }
217:
218:            /**
219:             * Create an awt font by converting as much information 
220:             * as possible from the provided swt <code>Font</code>.
221:             * 
222:             * @param device The swt device to draw on (display or gc device).
223:             * @param font The swt font to convert.
224:             * @return An awt font converted from the provided swt font.
225:             */
226:            public static java.awt.Font toAwtFont(Device device, Font font) {
227:                FontData fontData = font.getFontData()[0];
228:                return toAwtFont(device, fontData, true);
229:            }
230:
231:            /**
232:             * Creates an awt color instance to match the rgb values 
233:             * of the specified swt color.
234:             * 
235:             * @param color The swt color to match.
236:             * @return an awt color abject.
237:             */
238:            public static java.awt.Color toAwtColor(Color color) {
239:                return new java.awt.Color(color.getRed(), color.getGreen(),
240:                        color.getBlue());
241:            }
242:
243:            /**
244:             * Creates a swt color instance to match the rgb values 
245:             * of the specified awt paint. For now, this method test 
246:             * if the paint is a color and then return the adequate 
247:             * swt color. Otherwise plain black is assumed.
248:             * 
249:             * @param device The swt device to draw on (display or gc device).
250:             * @param paint The awt color to match.
251:             * @return a swt color object.
252:             */
253:            public static Color toSwtColor(Device device, java.awt.Paint paint) {
254:                java.awt.Color color;
255:                if (paint instanceof  java.awt.Color) {
256:                    color = (java.awt.Color) paint;
257:                } else {
258:                    try {
259:                        throw new Exception(
260:                                "only color is supported at present... "
261:                                        + "setting paint to uniform black color");
262:                    } catch (Exception e) {
263:                        e.printStackTrace();
264:                        color = new java.awt.Color(0, 0, 0);
265:                    }
266:                }
267:                return new org.eclipse.swt.graphics.Color(device, color
268:                        .getRed(), color.getGreen(), color.getBlue());
269:            }
270:
271:            /**
272:             * Creates a swt color instance to match the rgb values 
273:             * of the specified awt color. alpha channel is not supported.
274:             * Note that the dispose method will need to be called on the 
275:             * returned object.
276:             * 
277:             * @param device The swt device to draw on (display or gc device).
278:             * @param color The awt color to match.
279:             * @return a swt color object.
280:             */
281:            public static Color toSwtColor(Device device, java.awt.Color color) {
282:                return new org.eclipse.swt.graphics.Color(device, color
283:                        .getRed(), color.getGreen(), color.getBlue());
284:            }
285:
286:            /**
287:             * Transform an awt Rectangle2d instance into a swt one.
288:             * The coordinates are rounded to integer for the swt object.
289:             * @param rect2d The awt rectangle to map.
290:             * @return an swt <code>Rectangle</code> object.
291:             */
292:            public static Rectangle toSwtRectangle(Rectangle2D rect2d) {
293:                return new Rectangle((int) Math.round(rect2d.getMinX()),
294:                        (int) Math.round(rect2d.getMinY()), (int) Math
295:                                .round(rect2d.getWidth()), (int) Math
296:                                .round(rect2d.getHeight()));
297:            }
298:
299:            /**
300:             * Transform a swt Rectangle instance into an awt one.
301:             * @param rect the swt <code>Rectangle</code>
302:             * @return a Rectangle2D.Double instance with 
303:             * the eappropriate location and size.
304:             */
305:            public static Rectangle2D toAwtRectangle(Rectangle rect) {
306:                Rectangle2D rect2d = new Rectangle2D.Double();
307:                rect2d.setRect(rect.x, rect.y, rect.width, rect.height);
308:                return rect2d;
309:            }
310:
311:            /**
312:             * Returns an AWT point with the same coordinates as the specified 
313:             * SWT point.
314:             * 
315:             * @param p  the SWT point (<code>null</code> not permitted).
316:             * 
317:             * @return An AWT point with the same coordinates as <code>p</code>.
318:             * 
319:             * @see #toSwtPoint(java.awt.Point)
320:             */
321:            public static Point2D toAwtPoint(Point p) {
322:                return new java.awt.Point(p.x, p.y);
323:            }
324:
325:            /**
326:             * Returns an SWT point with the same coordinates as the specified
327:             * AWT point.
328:             * 
329:             * @param p  the AWT point (<code>null</code> not permitted).
330:             * 
331:             * @return An SWT point with the same coordinates as <code>p</code>.
332:             * 
333:             * @see #toAwtPoint(Point)
334:             */
335:            public static Point toSwtPoint(java.awt.Point p) {
336:                return new Point(p.x, p.y);
337:            }
338:
339:            /**
340:             * Returns an SWT point with the same coordinates as the specified AWT 
341:             * point (rounded to integer values).
342:             * 
343:             * @param p  the AWT point (<code>null</code> not permitted).
344:             * 
345:             * @return An SWT point with the same coordinates as <code>p</code>.
346:             * 
347:             * @see #toAwtPoint(Point)
348:             */
349:            public static Point toSwtPoint(java.awt.geom.Point2D p) {
350:                return new Point((int) Math.round(p.getX()), (int) Math.round(p
351:                        .getY()));
352:            }
353:
354:            /**
355:             * Creates an AWT <code>MouseEvent</code> from a swt event.
356:             * This method helps passing SWT mouse event to awt components.
357:             * @param event The swt event.
358:             * @return A AWT mouse event based on the given SWT event.
359:             */
360:            public static MouseEvent toAwtMouseEvent(
361:                    org.eclipse.swt.widgets.Event event) {
362:                MouseEvent awtMouseEvent = new MouseEvent(DUMMY_PANEL, event
363:                        .hashCode(), (long) event.time, SWT.NONE, event.x,
364:                        event.y, 1, false);
365:                return awtMouseEvent;
366:            }
367:        }
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