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41 import java.awt.*;
42 import java.util.*;
43 import java.awt.event.*;
44 import java.applet.Applet  ;
45
46 class GraphicsPanel extends Panel {
47 ActionListener al;
48 ItemListener il;
49 public GraphicsCards cards;
50
51 GraphicsPanel(EventListener listener) {
52 al = (ActionListener)listener;
53 il = (ItemListener)listener;
54
55 setLayout(new BorderLayout());
56
57 add("Center", cards = new GraphicsCards());
58
59 Panel p = new Panel();
60
62 Button b = new Button("next");
63 b.addActionListener(al);
64 p.add(b);
65
66 b = new Button("previous");
67 b.addActionListener(al);
68 p.add(b);
69
70 p.add(new Label("go to:", Label.RIGHT));
71
72 Choice c = new Choice();
73 c.addItemListener(il);
74 p.add(c);
75
76 c.addItem("Arc");
77 c.addItem("Oval");
78 c.addItem("Polygon");
79 c.addItem("Rect");
80 c.addItem("RoundRect");
81
82 add("North", p);
83
84 setSize(400, 400);
85 }
86
87 public Dimension getPreferredSize() {
88 return new Dimension(200, 100);
89 }
90 }
91
92 public class GraphicsTest extends Applet
93 implements ActionListener, ItemListener {
94 GraphicsPanel mainPanel;
95
96 public void init() {
97 setLayout(new BorderLayout());
98 add("Center", mainPanel = new GraphicsPanel(this));
99 }
100
101 public void destroy() {
102 remove(mainPanel);
103 }
104
105 public void actionPerformed(ActionEvent e) {
106 String arg = e.getActionCommand();
107
108 if ("next".equals(arg)) {
109 ((CardLayout)mainPanel.cards.getLayout()).next(mainPanel.cards);
110 }
111 else if ("previous".equals(arg)) {
112 ((CardLayout)mainPanel.cards.getLayout()).previous(mainPanel.cards);
113 }
114 }
115
116 public void itemStateChanged(ItemEvent e) {
117 ((CardLayout)mainPanel.cards.getLayout()).show(mainPanel.cards,(String )e.getItem());
118 }
119
120 public static void main(String args[]) {
121 AppletFrame.startApplet("GraphicsTest", "Graphics Test", args);
122 }
123
124 public String getAppletInfo() {
125 return "An interactive demonstration of some graphics.";
126 }
127 }
129
130 class GraphicsCards extends Panel {
131 public GraphicsCards() {
132 setLayout(new CardLayout());
133 add("Arc", new ArcCard());
134 add("Oval", new ShapeTest( new OvalShape() ) );
135 add("Polygon", new ShapeTest( new PolygonShape() ) );
136 add("Rect", new ShapeTest( new RectShape() ) );
137 add("RoundRect", new ShapeTest( new RoundRectShape() ) );
138 }
139 }
141
142 class ArcCard extends Panel {
143 public ArcCard() {
144 setLayout(new GridLayout(0, 2));
145 add(new ArcPanel(true));
146 add(new ArcPanel(false));
147 add(new ArcDegreePanel(true));
148 add(new ArcDegreePanel(false));
149 }
150 }
152
153 class ArcDegreePanel extends Panel {
154 boolean filled;
155
156 public ArcDegreePanel(boolean filled) {
157 this.filled = filled;
158 }
159
160 void arcSteps(Graphics g,
161 int step,
162 int x,
163 int y,
164 int w,
165 int h,
166 Color c1,
167 Color c2) {
168 int a1 = 0;
169 int a2 = step;
170 int progress = 0;
171 g.setColor(c1);
172 for (; (a1+a2) <= 360; a1 = a1+a2, a2 += 1) {
173 if (g.getColor() == c1) {
174 g.setColor(c2);
175 }
176 else {
177 g.setColor(c1);
178 }
179
180 if (filled) {
181 g.fillArc(x, y, w, h, a1, a2);
182 }
183 else {
184 g.drawArc(x, y, w, h, a1, a2);
185 }
186
187 progress = a1+a2;
188 }
190 if (progress != 360) {
191 if (filled) {
192 g.fillArc(x, y, w, h, a1, 360 - progress);
193 }
194 else {
195 g.drawArc(x, y, w, h, a1, 360 - progress);
196 }
197 } }
200 public void paint(Graphics g) {
201 Rectangle r = getBounds();
202
203 arcSteps(g, 3, 0, 0, r.width, r.height, Color.orange, Color.blue);
204
205 arcSteps(g,
206 2,
207 r.width / 4,
208 r.height / 4,
209 r.width / 2,
210 r.height / 2,
211 Color.yellow,
212 Color.green);
213
214 arcSteps(g,
215 1,
216 (r.width * 3) / 8,
217 (r.height * 3) / 8,
218 r.width / 4,
219 r.height / 4,
220 Color.magenta,
221 Color.white);
222
223 } }
226
227 class ArcPanel extends Panel {
228 boolean filled;
229
230 public ArcPanel(boolean filled) {
231 this.filled = filled;
232 }
233
234 public void paint(Graphics g)
235 {
236 Rectangle r = getBounds();
237
238 g.setColor(Color.yellow);
239 if (filled)
240 {
241 g.fillArc(0, 0, r.width, r.height, 0, 45);
242 }
243 else
244 {
245 g.drawArc(0, 0, r.width, r.height, 0, 45);
246 }
247
248 g.setColor(Color.green);
249 if (filled)
250 {
251 g.fillArc(0, 0, r.width, r.height, 90, -45);
252 }
253 else
254 {
255 g.drawArc(0, 0, r.width, r.height, 90, -45);
256 }
257
258 g.setColor(Color.orange);
259 if (filled)
260 {
261 g.fillArc(0, 0, r.width, r.height, 135, -45);
262 }
263 else
264 {
265 g.drawArc(0, 0, r.width, r.height, 135, -45);
266 }
267
268 g.setColor(Color.magenta);
269
270 if (filled)
271 {
272 g.fillArc(0, 0, r.width, r.height, -225, 45);
273 }
274 else
275 {
276 g.drawArc(0, 0, r.width, r.height, -225, 45);
277 }
278
279 g.setColor(Color.yellow);
280 if (filled)
281 {
282 g.fillArc(0, 0, r.width, r.height, 225, -45);
283 }
284 else
285 {
286 g.drawArc(0, 0, r.width, r.height, 225, -45);
287 }
288
289 g.setColor(Color.green);
290 if (filled)
291 {
292 g.fillArc(0, 0, r.width, r.height, -135, 45);
293 }
294 else
295 {
296 g.drawArc(0, 0, r.width, r.height, -135, 45);
297 }
298
299 g.setColor(Color.orange);
300 if (filled)
301 {
302 g.fillArc(0, 0, r.width, r.height, -45, -45);
303 }
304 else
305 {
306 g.drawArc(0, 0, r.width, r.height, -45, -45);
307 }
308
309 g.setColor(Color.magenta);
310 if (filled)
311 {
312 g.fillArc(0, 0, r.width, r.height, 315, 45);
313 }
314 else
315 {
316 g.drawArc(0, 0, r.width, r.height, 315, 45);
317 }
318
319 }
321 }
323
324 abstract class Shape
325 {
326 abstract void draw(Graphics g, int x, int y, int w, int h);
327 abstract void fill(Graphics g, int x, int y, int w, int h);
328 }
329
330
331 class RectShape extends Shape
332 {
333 void draw(Graphics g, int x, int y, int w, int h)
334 {
335 g.drawRect(x, y, w, h);
336 }
337
338 void fill(Graphics g, int x, int y, int w, int h)
339 {
340 g.fillRect(x, y, w, h);
341 }
342 }
343
344
345 class OvalShape extends Shape
346 {
347 void draw(Graphics g, int x, int y, int w, int h)
348 {
349 g.drawOval(x, y, w, h);
350 }
351
352 void fill(Graphics g, int x, int y, int w, int h)
353 {
354 g.fillOval(x, y, w, h);
355 }
356 }
357
358
359 class RoundRectShape extends Shape
360 {
361 void draw(Graphics g, int x, int y, int w, int h)
362 {
363 g.drawRoundRect(x, y, w, h, 10, 10);
364 }
365
366 void fill(Graphics g, int x, int y, int w, int h)
367 {
368 g.fillRoundRect(x, y, w, h, 10, 10);
369 }
370 }
371
372 class PolygonShape extends Shape
373 {
374 Polygon p;
376 Polygon pBase;
377
378 public PolygonShape()
379 {
380 pBase = new Polygon();
381 pBase.addPoint(0, 0);
382 pBase.addPoint(10, 0);
383 pBase.addPoint(5, 15);
384 pBase.addPoint(10, 20);
385 pBase.addPoint(5, 20);
386 pBase.addPoint(0, 10);
387 pBase.addPoint(0, 0);
388 }
389
390 void scalePolygon(float w, float h)
391 {
392 p = new Polygon();
393 for (int i = 0; i < pBase.npoints; ++i)
394 {
395 p.addPoint( (int) (pBase.xpoints[i] * w),
396 (int) (pBase.ypoints[i] * h) );
397 }
398
399 }
400
401 void draw(Graphics g, int x, int y, int w, int h)
402 {
403 Graphics ng = g.create();
404 try {
405 ng.translate(x, y);
406 scalePolygon( (float) ( (float) w / (float) 10 ),
407 (float) ( (float) h / (float) 20 ) );
408 ng.drawPolygon(p);
409 } finally {
410 ng.dispose();
411 }
412 }
413
414 void fill(Graphics g, int x, int y, int w, int h)
415 {
416 Graphics ng = g.create();
417 try {
418 ng.translate(x, y);
419 scalePolygon( (float) ( (float) w / (float) 10 ),
420 (float) ( (float) h / (float) 20 ) );
421 ng.fillPolygon(p);
422 } finally {
423 ng.dispose();
424 }
425 }
426 }
427
428
429 class ShapeTest extends Panel
430 {
431 Shape shape;
432 int step;
433
434 public ShapeTest(Shape shape, int step)
435 {
436 this.shape = shape;
437 this.step = step;
438 }
439
440 public ShapeTest(Shape shape)
441 {
442 this(shape, 10);
443 }
444
445 public void paint(Graphics g) {
446 Rectangle bounds = getBounds();
447
448 int cx, cy, cw, ch;
449
450 Color color;
451
452 for (color=Color.red,
453 cx=bounds.x,
454 cy=bounds.y,
455 cw=bounds.width / 2,
456 ch=bounds.height;
457 cw > 0 && ch > 0;
458
459 cx+=step,
460 cy += step,
461 cw -= (step * 2),
462 ch -= (step * 2),
463 color=ColorUtils.darker(color, 0.9) ) {
464 g.setColor(color);
465 shape.draw(g, cx, cy, cw, ch);
466 }
467
468 for (cx=bounds.x + bounds.width / 2,
469 cy=bounds.y,
470 cw=bounds.width / 2, ch=bounds.height;
471 cw > 0 && ch > 0;
472
473 cx+=step,
474 cy += step,
475 cw -= (step * 2),
476 ch -= (step * 2) ) {
477 if (g.getColor() == Color.red) {
478 g.setColor(Color.blue);
479 }
480 else {
481 g.setColor(Color.red);
482 }
483
484 shape.fill(g, cx, cy, cw, ch);
485 } } }
489 class ColorUtils {
490 static Color brighter(Color c, double factor) {
491 return new Color( Math.min((int)(c.getRed() *(1/factor)), 255),
492 Math.min((int)(c.getGreen()*(1/factor)), 255),
493 Math.min((int)(c.getBlue() *(1/factor)), 255) );
494 }
495
496 static Color darker(Color c, double factor) {
497 return new Color( Math.max((int)(c.getRed() *factor), 0),
498 Math.max((int)(c.getGreen()*factor), 0),
499 Math.max((int)(c.getBlue() *factor), 0) );
500 }
501 }
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