Source Code Cross Referenced for Text2D.java in  » 6.0-JDK-Modules » java-3d » com » sun » j3d » utils » geometry » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » 6.0 JDK Modules » java 3d » com.sun.j3d.utils.geometry 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:         * $RCSfile: Text2D.java,v $
003:         *
004:         * Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
005:         *
006:         * Redistribution and use in source and binary forms, with or without
007:         * modification, are permitted provided that the following conditions
008:         * are met:
009:         *
010:         * - Redistribution of source code must retain the above copyright
011:         *   notice, this list of conditions and the following disclaimer.
012:         *
013:         * - Redistribution in binary form must reproduce the above copyright
014:         *   notice, this list of conditions and the following disclaimer in
015:         *   the documentation and/or other materials provided with the
016:         *   distribution.
017:         *
018:         * Neither the name of Sun Microsystems, Inc. or the names of
019:         * contributors may be used to endorse or promote products derived
020:         * from this software without specific prior written permission.
021:         *
022:         * This software is provided "AS IS," without a warranty of any
023:         * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
024:         * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
025:         * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
026:         * EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
027:         * NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
028:         * USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
029:         * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
030:         * ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
031:         * CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
032:         * REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
033:         * INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
034:         * POSSIBILITY OF SUCH DAMAGES.
035:         *
036:         * You acknowledge that this software is not designed, licensed or
037:         * intended for use in the design, construction, operation or
038:         * maintenance of any nuclear facility.
039:         *
040:         * $Revision: 1.4 $
041:         * $Date: 2007/02/09 17:20:21 $
042:         * $State: Exp $
043:         */
044:
045:        package com.sun.j3d.utils.geometry;
046:
047:        import java.awt.image.BufferedImage;
048:        import java.awt.image.WritableRaster;
049:        import java.awt.image.DataBufferInt;
050:        import java.awt.Color;
051:        import java.awt.Font;
052:        import java.awt.FontMetrics;
053:        import java.awt.Graphics;
054:        import java.awt.Toolkit;
055:        import java.util.Hashtable;
056:
057:        import javax.media.j3d.*;
058:        import javax.vecmath.*;
059:
060:        /**
061:         * A Text2D object is a representation of a string as a texture mapped
062:         * rectangle.  The texture for the rectangle shows the string as rendered in
063:         * the specified color with a transparent background.  The appearance of the
064:         * characters is specified using the font indicated by the font name, size
065:         * and style (see java.awt.Font).  The approximate height of the rendered
066:         * string will be the font size times the rectangle scale factor, which has a
067:         * default value of 1/256.  For example, a 12 point font will produce
068:         * characters that are about 12/256 = 0.047 meters tall. The lower left
069:         * corner of the rectangle is located at (0,0,0) with the height
070:         * extending along the positive y-axis and the width extending along the
071:         * positive x-axis.
072:         */
073:        public class Text2D extends Shape3D {
074:
075:            // This table caches FontMetrics objects to avoid the huge cost
076:            // of re-retrieving metrics for a font we've already seen.
077:            private static Hashtable metricsTable = new Hashtable();
078:            float rectangleScaleFactor = 1f / 256f;
079:
080:            Color3f color = new Color3f();
081:            String fontName;
082:            int fontSize, fontStyle;
083:            String text;
084:
085:            /**
086:             * Creates a Shape3D object which holds a
087:             * rectangle that is texture-mapped with an image that has
088:             * the specified text written with the specified font
089:             * parameters.
090:             *
091:             * @param text The string to be written into the texture map.
092:             * @param color The color of the text string.
093:             * @param fontName The name of the Java font to be used for
094:             *  the text string.
095:             * @param fontSize The size of the Java font to be used.
096:             * @param fontStyle The style of the Java font to be used.
097:             */
098:            public Text2D(String text, Color3f color, String fontName,
099:                    int fontSize, int fontStyle) {
100:
101:                this .color.set(color);
102:                this .fontName = fontName;
103:                this .fontSize = fontSize;
104:                this .fontStyle = fontStyle;
105:                this .text = text;
106:
107:                updateText2D(text, color, fontName, fontSize, fontStyle);
108:            }
109:
110:            /*
111:             * Changes text of this Text2D to 'text'. All other
112:             * parameters (color, fontName, fontSize, fontStyle
113:             * remain the same.
114:             * @param text The string to be set.
115:             */
116:            public void setString(String text) {
117:                this .text = text;
118:
119:                Texture tex = getAppearance().getTexture();
120:                int width = tex.getWidth();
121:                int height = tex.getHeight();
122:
123:                ImageComponent imageComponent = setupImage(text, color,
124:                        fontName, fontSize, fontStyle);
125:                if ((imageComponent.getWidth() == width)
126:                        && (imageComponent.getHeight() == height)) {
127:                    tex.setImage(0, imageComponent);
128:                } else {
129:                    Texture2D newTex = setupTexture(imageComponent);
130:                    // Copy texture attributes except those related to
131:                    // mipmap since Texture only set base imageComponent. 
132:
133:                    newTex.setBoundaryModeS(tex.getBoundaryModeS());
134:                    newTex.setBoundaryModeT(tex.getBoundaryModeT());
135:                    newTex.setMinFilter(tex.getMinFilter());
136:                    newTex.setMagFilter(tex.getMagFilter());
137:                    newTex.setEnable(tex.getEnable());
138:                    newTex.setAnisotropicFilterMode(tex
139:                            .getAnisotropicFilterMode());
140:                    newTex.setAnisotropicFilterDegree(tex
141:                            .getAnisotropicFilterDegree());
142:                    int pcount = tex.getFilter4FuncPointsCount();
143:                    if (pcount > 0) {
144:                        float weights[] = new float[pcount];
145:                        tex.getFilter4Func(weights);
146:                        newTex.setFilter4Func(weights);
147:                    }
148:                    Color4f c = new Color4f();
149:                    tex.getBoundaryColor(c);
150:                    newTex.setBoundaryColor(c);
151:                    newTex.setUserData(tex.getUserData());
152:                    getAppearance().setTexture(newTex);
153:                }
154:            }
155:
156:            private void updateText2D(String text, Color3f color,
157:                    String fontName, int fontSize, int fontStyle) {
158:                ImageComponent imageComponent = setupImage(text, color,
159:                        fontName, fontSize, fontStyle);
160:
161:                Texture2D t2d = setupTexture(imageComponent);
162:
163:                QuadArray rect = setupGeometry(imageComponent.getWidth(),
164:                        imageComponent.getHeight());
165:                setGeometry(rect);
166:
167:                Appearance appearance = setupAppearance(t2d);
168:                setAppearance(appearance);
169:            }
170:
171:            /**
172:             * Sets the scale factor used in converting the image width/height
173:             * to width/height values in 3D.
174:             *
175:             * @param newScaleFactor The new scale factor.
176:             */
177:            public void setRectangleScaleFactor(float newScaleFactor) {
178:                rectangleScaleFactor = newScaleFactor;
179:                updateText2D(text, color, fontName, fontSize, fontStyle);
180:            }
181:
182:            /**
183:             * Gets the current scale factor being used in converting the image
184:             * width/height to width/height values in 3D.
185:             *
186:             * @return The current scale factor.
187:             */
188:            public float getRectangleScaleFactor() {
189:                return rectangleScaleFactor;
190:            }
191:
192:            /**
193:             * Create the ImageComponent and Texture object.
194:             */
195:            private Texture2D setupTexture(ImageComponent imageComponent) {
196:                Texture2D t2d = new Texture2D(Texture2D.BASE_LEVEL,
197:                        Texture.RGBA, imageComponent.getWidth(), imageComponent
198:                                .getHeight());
199:                t2d.setMinFilter(t2d.BASE_LEVEL_LINEAR);
200:                t2d.setMagFilter(t2d.BASE_LEVEL_LINEAR);
201:                t2d.setImage(0, imageComponent);
202:                t2d.setEnable(true);
203:                t2d.setCapability(Texture.ALLOW_IMAGE_WRITE);
204:                t2d.setCapability(Texture.ALLOW_SIZE_READ);
205:                t2d.setCapability(Texture.ALLOW_ENABLE_READ);
206:                t2d.setCapability(Texture.ALLOW_BOUNDARY_MODE_READ);
207:                t2d.setCapability(Texture.ALLOW_FILTER_READ);
208:                t2d.setCapability(Texture.ALLOW_BOUNDARY_COLOR_READ);
209:                t2d.setCapability(Texture.ALLOW_ANISOTROPIC_FILTER_READ);
210:                t2d.setCapability(Texture.ALLOW_FILTER4_READ);
211:                return t2d;
212:            }
213:
214:            /**
215:             * Creates a ImageComponent2D of the correct dimensions for the
216:             * given font attributes.  Draw the given text into the image in
217:             * the given color.  The background of the image is transparent
218:             * (alpha = 0).
219:             */
220:            private ImageComponent setupImage(String text, Color3f color,
221:                    String fontName, int fontSize, int fontStyle) {
222:                Toolkit toolkit = Toolkit.getDefaultToolkit();
223:                Font font = new java.awt.Font(fontName, fontStyle, fontSize);
224:
225:                FontMetrics metrics;
226:                if ((metrics = (FontMetrics) metricsTable.get(font)) == null) {
227:                    metrics = toolkit.getFontMetrics(font);
228:                    metricsTable.put(font, metrics);
229:                }
230:                int width = metrics.stringWidth(text);
231:                int descent = metrics.getMaxDescent();
232:                int ascent = metrics.getMaxAscent();
233:                int leading = metrics.getLeading();
234:                int height = descent + ascent;
235:
236:                // Need to make width/height powers of 2 because of Java3d texture
237:                // size restrictions
238:                int pow = 1;
239:                for (int i = 1; i < 32; ++i) {
240:                    pow *= 2;
241:                    if (width <= pow)
242:                        break;
243:                }
244:                width = Math.max(width, pow);
245:                pow = 1;
246:                for (int i = 1; i < 32; ++i) {
247:                    pow *= 2;
248:                    if (height <= pow)
249:                        break;
250:                }
251:                height = Math.max(height, pow);
252:
253:                // For now, jdk 1.2 only handles ARGB format, not the RGBA we want
254:                BufferedImage bImage = new BufferedImage(width, height,
255:                        BufferedImage.TYPE_INT_ARGB);
256:                Graphics offscreenGraphics = bImage.createGraphics();
257:
258:                // First, erase the background to the text panel - set alpha to 0
259:                Color myFill = new Color(0f, 0f, 0f, 0f);
260:                offscreenGraphics.setColor(myFill);
261:                offscreenGraphics.fillRect(0, 0, width, height);
262:
263:                // Next, set desired text properties (font, color) and draw String
264:                offscreenGraphics.setFont(font);
265:                Color myTextColor = new Color(color.x, color.y, color.z, 1f);
266:                offscreenGraphics.setColor(myTextColor);
267:                offscreenGraphics.drawString(text, 0, height - descent);
268:
269:                ImageComponent imageComponent = new ImageComponent2D(
270:                        ImageComponent.FORMAT_RGBA, bImage);
271:
272:                imageComponent.setCapability(ImageComponent.ALLOW_SIZE_READ);
273:
274:                return imageComponent;
275:            }
276:
277:            /**
278:             * Creates a rectangle of the given width and height and sets up
279:             * texture coordinates to map the text image onto the whole surface
280:             * of the rectangle (the rectangle is the same size as the text image)
281:             */
282:            private QuadArray setupGeometry(int width, int height) {
283:                float zPosition = 0f;
284:                float rectWidth = (float) width * rectangleScaleFactor;
285:                float rectHeight = (float) height * rectangleScaleFactor;
286:                float[] verts1 = { rectWidth, 0f, zPosition, rectWidth,
287:                        rectHeight, zPosition, 0f, rectHeight, zPosition, 0f,
288:                        0f, zPosition };
289:                float[] texCoords = { 0f, -1f, 0f, 0f, (-1f), 0f, (-1f), -1f };
290:
291:                QuadArray rect = new QuadArray(4, QuadArray.COORDINATES
292:                        | QuadArray.TEXTURE_COORDINATE_2);
293:                rect.setCoordinates(0, verts1);
294:                rect.setTextureCoordinates(0, 0, texCoords);
295:
296:                return rect;
297:            }
298:
299:            /**
300:             * Creates Appearance for this Shape3D.  This sets transparency
301:             * for the object (we want the text to be "floating" in space,
302:             * so only the text itself should be non-transparent.  Also, the
303:             * appearance disables lighting for the object; the text will
304:             * simply be colored, not lit.
305:             */
306:            private Appearance setupAppearance(Texture2D t2d) {
307:                TransparencyAttributes transp = new TransparencyAttributes();
308:                transp.setTransparencyMode(TransparencyAttributes.BLENDED);
309:                transp.setTransparency(0f);
310:                Appearance appearance = new Appearance();
311:                appearance.setTransparencyAttributes(transp);
312:                appearance.setTexture(t2d);
313:
314:                Material m = new Material();
315:                m.setLightingEnable(false);
316:                appearance.setMaterial(m);
317:
318:                return appearance;
319:            }
320:
321:            /**
322:             * Returns the text string
323:             *
324:             * @since Java 3D 1.2.1
325:             */
326:            public String getString() {
327:                return text;
328:            }
329:
330:            /**
331:             * Returns the color of the text
332:             *
333:             * @since Java 3D 1.2.1
334:             */
335:            public Color3f getColor() {
336:                return color;
337:            }
338:
339:            /**
340:             * Returns the font
341:             *
342:             * @since Java 3D 1.2.1
343:             */
344:            public String getFontName() {
345:                return fontName;
346:            }
347:
348:            /**
349:             * Returns the font size
350:             *
351:             * @since Java 3D 1.2.1
352:             */
353:            public int getFontSize() {
354:                return fontSize;
355:            }
356:
357:            /**
358:             * Returns the font style
359:             *
360:             * @since Java 3D 1.2.1
361:             */
362:            public int getFontStyle() {
363:                return fontStyle;
364:            }
365:
366:        }
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