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40
41 package java2d.demos.Mix;
42
43 import static java.awt.Color  .*;
44 import java.awt.*;
45 import java.awt.event.*;
46 import java.awt.geom.GeneralPath ;
47 import java.awt.geom.PathIterator ;
48 import java.awt.font.FontRenderContext ;
49 import java.awt.font.TextLayout ;
50 import java.awt.image.BufferedImage ;
51 import java.io.File ;
52 import java.io.FileReader ;
53 import java.io.BufferedReader ;
54 import java.util.Vector ;
55 import javax.swing.*;
56 import java2d.AnimatingControlsSurface;
57 import java2d.CustomControls;
58
59 import static java.lang.Math.random ;
60
61
62
66 public class BezierScroller extends AnimatingControlsSurface {
67
68 private static String appletStrs[] =
69 { " ", "Java2Demo",
70 "BezierScroller - Animated Bezier Curve shape with images",
71 "For README.txt file scrolling run in application mode", " " };
72 private static final int NUMPTS = 6;
73 private static Color greenBlend = new Color (0, 255, 0, 100);
74 private static Color blueBlend = new Color (0, 0, 255, 100);
75 private static Font font = new Font("serif", Font.PLAIN, 12);
76 private static BasicStroke bs = new BasicStroke(3.0f);
77 private static Image hotj_img;
78 private static BufferedImage img;
79 private static final int UP = 0;
80 private static final int DOWN = 1;
81
82 private float animpts[] = new float[NUMPTS * 2];
83 private float deltas[] = new float[NUMPTS * 2];
84 private BufferedReader reader;
85 private int nStrs;
86 private int strH;
87 private int yy, ix, iy, imgX;
88 private Vector vector, appletVector;
89 private float alpha = 0.2f;
90 private int alphaDirection;
91 protected boolean doImage, doShape, doText;
92 protected boolean buttonToggle;
93
94
95 public BezierScroller() {
96 setBackground(WHITE);
97 doShape = doText = true;
98 hotj_img = getImage("java-logo.gif");
99 Image image = getImage("jumptojavastrip.png");
100 int iw = image.getWidth(this);
101 int ih = image.getHeight(this);
102 img = new BufferedImage (iw, ih, BufferedImage.TYPE_INT_RGB);
103 img.createGraphics().drawImage(image, 0, 0, this);
104 setControls(new Component[] { new DemoControls(this) });
105 }
106
107
108 public void animate(float[] pts, float[] deltas, int index, int limit) {
109 float newpt = pts[index] + deltas[index];
110 if (newpt <= 0) {
111 newpt = -newpt;
112 deltas[index] = (float) (random() * 4.0 + 2.0);
113 } else if (newpt >= (float) limit) {
114 newpt = 2.0f * limit - newpt;
115 deltas[index] = - (float) (random() * 4.0 + 2.0);
116 }
117 pts[index] = newpt;
118 }
119
120
121 public void getFile() {
122 try {
123 String fName = "README.txt";
124 if ((reader = new BufferedReader (new FileReader (fName))) != null) {
125 getLine();
126 }
127 } catch (Exception e) { reader = null; }
128 if (reader == null) {
129 appletVector = new Vector (100);
130 for (int i = 0; i < 100; i++) {
131 appletVector.addElement(appletStrs[i%appletStrs.length]);
132 }
133 getLine();
134 }
135 buttonToggle = true;
136 }
137
138
139 public String getLine() {
140 String str = null;
141 if (reader != null) {
142 try {
143 if ((str = reader.readLine()) != null) {
144 if (str.length() == 0) {
145 str = " ";
146 }
147 vector.addElement(str);
148 }
149 } catch (Exception e) { e.printStackTrace(); reader = null; }
150 } else {
151 if (appletVector.size() != 0) {
152 vector.addElement(str = (String ) appletVector.remove(0));
153 }
154 }
155 return str;
156 }
157
158
159 public void reset(int w, int h) {
160 for (int i = 0; i < animpts.length; i += 2) {
161 animpts[i + 0] = (float) (random() * w);
162 animpts[i + 1] = (float) (random() * h);
163 deltas[i + 0] = (float) (random() * 6.0 + 4.0);
164 deltas[i + 1] = (float) (random() * 6.0 + 4.0);
165 if (animpts[i + 0] > w / 2.0f) {
166 deltas[i + 0] = -deltas[i + 0];
167 }
168 if (animpts[i + 1] > h / 2.0f) {
169 deltas[i + 1] = -deltas[i + 1];
170 }
171 }
172 FontMetrics fm = getFontMetrics(font);
173 strH = fm.getAscent()+fm.getDescent();
174 nStrs = h/strH+2;
175 vector = new Vector (nStrs);
176 ix = (int) (random() * (w - 80));
177 iy = (int) (random() * (h - 80));
178 }
179
180
181 public void step(int w, int h) {
182 if (doText && vector.size() == 0) {
183 getFile();
184 }
185 if (doText) {
186 String s = getLine();
187 if (s == null || vector.size() == nStrs && vector.size() != 0) {
188 vector.removeElementAt(0);
189 }
190 yy = (s == null) ? 0 : h - vector.size() * strH;
191 }
192
193 for (int i = 0; i < animpts.length && doShape; i += 2) {
194 animate(animpts, deltas, i + 0, w);
195 animate(animpts, deltas, i + 1, h);
196 }
197 if (doImage && alphaDirection == UP) {
198 if ((alpha += 0.025) > .99) {
199 alphaDirection = DOWN;
200 alpha = 1.0f;
201 }
202 } else if (doImage && alphaDirection == DOWN) {
203 if ((alpha -= .02) < 0.01) {
204 alphaDirection = UP;
205 alpha = 0;
206 ix = (int) (random() * (w - 80));
207 iy = (int) (random() * (h - 80));
208 }
209 }
210 if (doImage) {
211 if ((imgX += 80) == 800) {
212 imgX = 0;
213 }
214 }
215 }
216
217
218
219 public void render(int w, int h, Graphics2D g2) {
220
221 if (doText) {
222 g2.setColor(LIGHT_GRAY);
223 g2.setFont(font);
224 float y = yy;
225 for (int i = 0; i < vector.size(); i++) {
226 g2.drawString((String )vector.get(i), 1, y += strH);
227 }
228 }
229
230 if (doShape) {
231 float[] ctrlpts = animpts;
232 int len = ctrlpts.length;
233 float prevx = ctrlpts[len - 2];
234 float prevy = ctrlpts[len - 1];
235 float curx = ctrlpts[0];
236 float cury = ctrlpts[1];
237 float midx = (curx + prevx) / 2.0f;
238 float midy = (cury + prevy) / 2.0f;
239 GeneralPath gp = new GeneralPath (GeneralPath.WIND_NON_ZERO);
240 gp.moveTo(midx, midy);
241 for (int i = 2; i <= ctrlpts.length; i += 2) {
242 float x1 = (midx + curx) / 2.0f;
243 float y1 = (midy + cury) / 2.0f;
244 prevx = curx;
245 prevy = cury;
246 if (i < ctrlpts.length) {
247 curx = ctrlpts[i + 0];
248 cury = ctrlpts[i + 1];
249 } else {
250 curx = ctrlpts[0];
251 cury = ctrlpts[1];
252 }
253 midx = (curx + prevx) / 2.0f;
254 midy = (cury + prevy) / 2.0f;
255 float x2 = (prevx + midx) / 2.0f;
256 float y2 = (prevy + midy) / 2.0f;
257 gp.curveTo(x1, y1, x2, y2, midx, midy);
258 }
259 gp.closePath();
260
261 g2.setColor(blueBlend);
262 g2.setStroke(bs);
263 g2.draw(gp);
264 g2.setColor(greenBlend);
265 g2.fill(gp);
266
267 PathIterator pi = gp.getPathIterator(null);
268 float pts[] = new float[6];
269 while ( !pi.isDone() ) {
270 if (pi.currentSegment(pts) == pi.SEG_CUBICTO) {
271 g2.drawImage(hotj_img, (int) pts[0], (int) pts[1], this);
272 }
273 pi.next();
274 }
275 }
276
277 if (doImage) {
278 AlphaComposite ac = AlphaComposite.getInstance(
279 AlphaComposite.SRC_OVER, alpha);
280 g2.setComposite(ac);
281 g2.drawImage(img.getSubimage(imgX,0,80,80), ix, iy, this);
282 }
283 }
284
285
286 public static void main(String argv[]) {
287 createDemoFrame(new BezierScroller());
288 }
289
290
291 static class DemoControls extends CustomControls implements ActionListener {
292
293 BezierScroller demo;
294 JToolBar toolbar;
295 JComboBox combo;
296
297 public DemoControls(BezierScroller demo) {
298 super(demo.name);
299 this.demo = demo;
300 add(toolbar = new JToolBar());
301 toolbar.setFloatable(false);
302 addTool("Image", false);
303 addTool("Shape", true);
304 addTool("Text", true);
305 }
306
307
308 public void addTool(String str, boolean state) {
309 JToggleButton b = (JToggleButton) toolbar.add(new JToggleButton(str));
310 b.setFocusPainted(false);
311 b.setSelected(state);
312 b.addActionListener(this);
313 int width = b.getPreferredSize().width;
314 Dimension prefSize = new Dimension(width, 21);
315 b.setPreferredSize(prefSize);
316 b.setMaximumSize(prefSize);
317 b.setMinimumSize(prefSize);
318 }
319
320
321 public void actionPerformed(ActionEvent e) {
322 JToggleButton b = (JToggleButton) e.getSource();
323 if (b.getText().equals("Image")) {
324 demo.doImage = b.isSelected();
325 } else if (b.getText().equals("Shape")) {
326 demo.doShape = b.isSelected();
327 } else {
328 demo.doText = b.isSelected();
329 }
330 if (demo.animating.thread == null) {
331 demo.repaint();
332 }
333 }
334
335 public Dimension getPreferredSize() {
336 return new Dimension(200,40);
337 }
338
339
340 public void run() {
341 Thread me = Thread.currentThread();
342 int i = 0;
343 while (thread == me) {
344 try {
345 thread.sleep(250);
346 } catch (InterruptedException e) { return; }
347 if (demo.buttonToggle) {
348 ((AbstractButton) toolbar.getComponentAtIndex(i++%2)).doClick();
349 demo.buttonToggle = false;
350 }
351 }
352 thread = null;
353 }
354 } } |
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