J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1997-2006 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * |
| 4 | * Redistribution and use in source and binary forms, with or without |
| 5 | * modification, are permitted provided that the following conditions |
| 6 | * are met: |
| 7 | * |
| 8 | * - Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * |
| 11 | * - Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * - Neither the name of Sun Microsystems nor the names of its |
| 16 | * contributors may be used to endorse or promote products derived |
| 17 | * from this software without specific prior written permission. |
| 18 | * |
| 19 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| 20 | * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| 21 | * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 22 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| 23 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| 24 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| 25 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| 26 | * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 27 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 28 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 29 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 30 | */ |
| 31 | |
| 32 | /* |
| 33 | */ |
| 34 | |
| 35 | import java.applet.Applet; |
| 36 | import java.awt.event.*; |
| 37 | import java.awt.*; |
| 38 | import java.awt.image.ColorModel; |
| 39 | import java.awt.image.MemoryImageSource; |
| 40 | |
| 41 | public class DitherTest extends Applet implements Runnable { |
| 42 | final private static int NOOP = 0; |
| 43 | final private static int RED = 1; |
| 44 | final private static int GREEN = 2; |
| 45 | final private static int BLUE = 3; |
| 46 | final private static int ALPHA = 4; |
| 47 | final private static int SATURATION = 5; |
| 48 | |
| 49 | private Thread runner; |
| 50 | |
| 51 | private DitherControls XControls; |
| 52 | private DitherControls YControls; |
| 53 | private DitherCanvas canvas; |
| 54 | |
| 55 | public static void main(String args[]) { |
| 56 | Frame f = new Frame("DitherTest"); |
| 57 | DitherTest ditherTest = new DitherTest(); |
| 58 | ditherTest.init(); |
| 59 | f.add("Center", ditherTest); |
| 60 | f.pack(); |
| 61 | f.setVisible(true); |
| 62 | ditherTest.start(); |
| 63 | } |
| 64 | |
| 65 | public void init() { |
| 66 | String xspec = null, yspec = null; |
| 67 | int xvals[] = new int[2]; |
| 68 | int yvals[] = new int[2]; |
| 69 | |
| 70 | try { |
| 71 | xspec = getParameter("xaxis"); |
| 72 | yspec = getParameter("yaxis"); |
| 73 | } catch (NullPointerException npe) { |
| 74 | //only occurs if run as application |
| 75 | } |
| 76 | |
| 77 | if (xspec == null) { |
| 78 | xspec = "red"; |
| 79 | } |
| 80 | if (yspec == null) { |
| 81 | yspec = "blue"; |
| 82 | } |
| 83 | int xmethod = colormethod(xspec, xvals); |
| 84 | int ymethod = colormethod(yspec, yvals); |
| 85 | |
| 86 | setLayout(new BorderLayout()); |
| 87 | XControls = new DitherControls(this, xvals[0], xvals[1], |
| 88 | xmethod, false); |
| 89 | YControls = new DitherControls(this, yvals[0], yvals[1], |
| 90 | ymethod, true); |
| 91 | YControls.addRenderButton(); |
| 92 | add("North", XControls); |
| 93 | add("South", YControls); |
| 94 | add("Center", canvas = new DitherCanvas()); |
| 95 | } |
| 96 | |
| 97 | private int colormethod(String s, int vals[]) { |
| 98 | int method = NOOP; |
| 99 | if (s == null) { |
| 100 | s = ""; |
| 101 | } |
| 102 | String lower = s.toLowerCase(); |
| 103 | int len = 0; |
| 104 | if (lower.startsWith("red")) { |
| 105 | method = RED; |
| 106 | lower = lower.substring(3); |
| 107 | } else if (lower.startsWith("green")) { |
| 108 | method = GREEN; |
| 109 | lower = lower.substring(5); |
| 110 | } else if (lower.startsWith("blue")) { |
| 111 | method = BLUE; |
| 112 | lower = lower.substring(4); |
| 113 | } else if (lower.startsWith("alpha")) { |
| 114 | method = ALPHA; |
| 115 | lower = lower.substring(5); |
| 116 | } else if (lower.startsWith("saturation")) { |
| 117 | method = SATURATION; |
| 118 | lower = lower.substring(10); |
| 119 | } |
| 120 | if (method == NOOP) { |
| 121 | vals[0] = 0; |
| 122 | vals[1] = 0; |
| 123 | return method; |
| 124 | } |
| 125 | int begval = 0; |
| 126 | int endval = 255; |
| 127 | try { |
| 128 | int dash = lower.indexOf('-'); |
| 129 | if (dash < 0) { |
| 130 | endval = Integer.parseInt(lower); |
| 131 | } else { |
| 132 | begval = Integer.parseInt(lower.substring(0, dash)); |
| 133 | endval = Integer.parseInt(lower.substring(dash + 1)); |
| 134 | } |
| 135 | } catch (NumberFormatException nfe) { |
| 136 | } |
| 137 | |
| 138 | if (begval < 0) { |
| 139 | begval = 0; |
| 140 | } else if (begval > 255) { |
| 141 | begval = 255; |
| 142 | } |
| 143 | |
| 144 | if (endval < 0) { |
| 145 | endval = 0; |
| 146 | } else if (endval > 255) { |
| 147 | endval = 255; |
| 148 | } |
| 149 | |
| 150 | vals[0] = begval; |
| 151 | vals[1] = endval; |
| 152 | return method; |
| 153 | } |
| 154 | |
| 155 | /** |
| 156 | * Calculates and returns the image. Halts the calculation and returns |
| 157 | * null if the Applet is stopped during the calculation. |
| 158 | */ |
| 159 | private Image calculateImage() { |
| 160 | Thread me = Thread.currentThread(); |
| 161 | |
| 162 | int width = canvas.getSize().width; |
| 163 | int height = canvas.getSize().height; |
| 164 | int xvals[] = new int[2]; |
| 165 | int yvals[] = new int[2]; |
| 166 | int xmethod = XControls.getParams(xvals); |
| 167 | int ymethod = YControls.getParams(yvals); |
| 168 | int pixels[] = new int[width * height]; |
| 169 | int c[] = new int[4]; //temporarily holds R,G,B,A information |
| 170 | int index = 0; |
| 171 | for (int j = 0; j < height; j++) { |
| 172 | for (int i = 0; i < width; i++) { |
| 173 | c[0] = c[1] = c[2] = 0; |
| 174 | c[3] = 255; |
| 175 | if (xmethod < ymethod) { |
| 176 | applymethod(c, xmethod, i, width, xvals); |
| 177 | applymethod(c, ymethod, j, height, yvals); |
| 178 | } else { |
| 179 | applymethod(c, ymethod, j, height, yvals); |
| 180 | applymethod(c, xmethod, i, width, xvals); |
| 181 | } |
| 182 | pixels[index++] = ((c[3] << 24) | |
| 183 | (c[0] << 16) | |
| 184 | (c[1] << 8) | |
| 185 | c[2]); |
| 186 | } |
| 187 | |
| 188 | // Poll once per row to see if we've been told to stop. |
| 189 | if (runner != me) { |
| 190 | return null; |
| 191 | } |
| 192 | } |
| 193 | return createImage(new MemoryImageSource(width, height, |
| 194 | ColorModel.getRGBdefault(), pixels, 0, width)); |
| 195 | } |
| 196 | |
| 197 | private void applymethod(int c[], int method, int step, |
| 198 | int total, int vals[]) { |
| 199 | if (method == NOOP) { |
| 200 | return; |
| 201 | } |
| 202 | int val = ((total < 2) |
| 203 | ? vals[0] |
| 204 | : vals[0] + ((vals[1] - vals[0]) * step / (total - 1))); |
| 205 | switch (method) { |
| 206 | case RED: |
| 207 | c[0] = val; |
| 208 | break; |
| 209 | case GREEN: |
| 210 | c[1] = val; |
| 211 | break; |
| 212 | case BLUE: |
| 213 | c[2] = val; |
| 214 | break; |
| 215 | case ALPHA: |
| 216 | c[3] = val; |
| 217 | break; |
| 218 | case SATURATION: |
| 219 | int max = Math.max(Math.max(c[0], c[1]), c[2]); |
| 220 | int min = max * (255 - val) / 255; |
| 221 | if (c[0] == 0) { |
| 222 | c[0] = min; |
| 223 | } |
| 224 | if (c[1] == 0) { |
| 225 | c[1] = min; |
| 226 | } |
| 227 | if (c[2] == 0) { |
| 228 | c[2] = min; |
| 229 | } |
| 230 | break; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | public void start() { |
| 235 | runner = new Thread(this); |
| 236 | runner.start(); |
| 237 | } |
| 238 | |
| 239 | public void run() { |
| 240 | canvas.setImage(null); // Wipe previous image |
| 241 | Image img = calculateImage(); |
| 242 | if (img != null && runner == Thread.currentThread()) { |
| 243 | canvas.setImage(img); |
| 244 | } |
| 245 | } |
| 246 | |
| 247 | public void stop() { |
| 248 | runner = null; |
| 249 | } |
| 250 | |
| 251 | public void destroy() { |
| 252 | remove(XControls); |
| 253 | remove(YControls); |
| 254 | remove(canvas); |
| 255 | } |
| 256 | |
| 257 | public String getAppletInfo() { |
| 258 | return "An interactive demonstration of dithering."; |
| 259 | } |
| 260 | |
| 261 | public String[][] getParameterInfo() { |
| 262 | String[][] info = { |
| 263 | {"xaxis", "{RED, GREEN, BLUE, ALPHA, SATURATION}", |
| 264 | "The color of the Y axis. Default is RED."}, |
| 265 | {"yaxis", "{RED, GREEN, BLUE, ALPHA, SATURATION}", |
| 266 | "The color of the X axis. Default is BLUE."} |
| 267 | }; |
| 268 | return info; |
| 269 | } |
| 270 | } |
| 271 | |
| 272 | class DitherCanvas extends Canvas { |
| 273 | private Image img; |
| 274 | private static String calcString = "Calculating..."; |
| 275 | |
| 276 | public void paint(Graphics g) { |
| 277 | int w = getSize().width; |
| 278 | int h = getSize().height; |
| 279 | if (img == null) { |
| 280 | super.paint(g); |
| 281 | g.setColor(Color.black); |
| 282 | FontMetrics fm = g.getFontMetrics(); |
| 283 | int x = (w - fm.stringWidth(calcString)) / 2; |
| 284 | int y = h / 2; |
| 285 | g.drawString(calcString, x, y); |
| 286 | } else { |
| 287 | g.drawImage(img, 0, 0, w, h, this); |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | public void update(Graphics g) { |
| 292 | paint(g); |
| 293 | } |
| 294 | |
| 295 | public Dimension getMinimumSize() { |
| 296 | return new Dimension(20, 20); |
| 297 | } |
| 298 | |
| 299 | public Dimension getPreferredSize() { |
| 300 | return new Dimension(200, 200); |
| 301 | } |
| 302 | |
| 303 | public Image getImage() { |
| 304 | return img; |
| 305 | } |
| 306 | |
| 307 | public void setImage(Image img) { |
| 308 | this.img = img; |
| 309 | repaint(); |
| 310 | } |
| 311 | } |
| 312 | |
| 313 | class DitherControls extends Panel implements ActionListener { |
| 314 | private CardinalTextField start; |
| 315 | private CardinalTextField end; |
| 316 | private Button button; |
| 317 | private Choice choice; |
| 318 | private DitherTest applet; |
| 319 | |
| 320 | private static LayoutManager dcLayout = new FlowLayout(FlowLayout.CENTER, |
| 321 | 10, 5); |
| 322 | |
| 323 | public DitherControls(DitherTest app, int s, int e, int type, |
| 324 | boolean vertical) { |
| 325 | applet = app; |
| 326 | setLayout(dcLayout); |
| 327 | add(new Label(vertical ? "Vertical" : "Horizontal")); |
| 328 | add(choice = new Choice()); |
| 329 | choice.addItem("Noop"); |
| 330 | choice.addItem("Red"); |
| 331 | choice.addItem("Green"); |
| 332 | choice.addItem("Blue"); |
| 333 | choice.addItem("Alpha"); |
| 334 | choice.addItem("Saturation"); |
| 335 | choice.select(type); |
| 336 | add(start = new CardinalTextField(Integer.toString(s), 4)); |
| 337 | add(end = new CardinalTextField(Integer.toString(e), 4)); |
| 338 | } |
| 339 | |
| 340 | /* puts on the button */ |
| 341 | public void addRenderButton() { |
| 342 | add(button = new Button("New Image")); |
| 343 | button.addActionListener(this); |
| 344 | } |
| 345 | |
| 346 | /* retrieves data from the user input fields */ |
| 347 | public int getParams(int vals[]) { |
| 348 | try { |
| 349 | vals[0] = scale(Integer.parseInt(start.getText())); |
| 350 | } catch (NumberFormatException nfe) { |
| 351 | vals[0] = 0; |
| 352 | } |
| 353 | try { |
| 354 | vals[1] = scale(Integer.parseInt(end.getText())); |
| 355 | } catch (NumberFormatException nfe) { |
| 356 | vals[1] = 255; |
| 357 | } |
| 358 | return choice.getSelectedIndex(); |
| 359 | } |
| 360 | |
| 361 | /* fits the number between 0 and 255 inclusive */ |
| 362 | private int scale(int number) { |
| 363 | if (number < 0) { |
| 364 | number = 0; |
| 365 | } else if (number > 255) { |
| 366 | number = 255; |
| 367 | } |
| 368 | return number; |
| 369 | } |
| 370 | |
| 371 | /* called when user clicks the button */ |
| 372 | public void actionPerformed(ActionEvent e) { |
| 373 | if (e.getSource() == button) { |
| 374 | applet.start(); |
| 375 | } |
| 376 | } |
| 377 | } |
| 378 | |
| 379 | class CardinalTextField extends TextField { |
| 380 | |
| 381 | String oldText = null; |
| 382 | |
| 383 | public CardinalTextField(String text, int columns) { |
| 384 | super(text, columns); |
| 385 | enableEvents(AWTEvent.KEY_EVENT_MASK | AWTEvent.TEXT_EVENT_MASK); |
| 386 | oldText = getText(); |
| 387 | } |
| 388 | |
| 389 | // Consume non-digit KeyTyped events |
| 390 | // Note that processTextEvent kind of eliminates the need for this |
| 391 | // function, but this is neater, since ideally, it would prevent |
| 392 | // the text from appearing at all. Sigh. See bugid 4100317/4114565. |
| 393 | // |
| 394 | protected void processEvent(AWTEvent evt) { |
| 395 | int id = evt.getID(); |
| 396 | if (id != KeyEvent.KEY_TYPED) { |
| 397 | super.processEvent(evt); |
| 398 | return; |
| 399 | } |
| 400 | |
| 401 | KeyEvent kevt = (KeyEvent) evt; |
| 402 | char c = kevt.getKeyChar(); |
| 403 | |
| 404 | // Digits, backspace, and delete are okay |
| 405 | // Note that the minus sign is not allowed (neither is decimal) |
| 406 | if (Character.isDigit(c) || (c == '\b') || (c == '\u007f')) { |
| 407 | super.processEvent(evt); |
| 408 | return; |
| 409 | } |
| 410 | |
| 411 | Toolkit.getDefaultToolkit().beep(); |
| 412 | kevt.consume(); |
| 413 | } |
| 414 | |
| 415 | // Should consume TextEvents for non-integer Strings |
| 416 | // Store away the text in the tf for every TextEvent |
| 417 | // so we can revert to it on a TextEvent (paste, or |
| 418 | // legal key in the wrong location) with bad text |
| 419 | // |
| 420 | // Note: it would be easy to extend this to an eight-bit |
| 421 | // TextField (range 0-255), but I'll leave it as-is. |
| 422 | // |
| 423 | protected void processTextEvent(TextEvent te) { |
| 424 | // The empty string is okay, too |
| 425 | String newText = getText(); |
| 426 | if (newText.equals("") || textIsCardinal(newText)) { |
| 427 | oldText = newText; |
| 428 | super.processTextEvent(te); |
| 429 | return; |
| 430 | } |
| 431 | |
| 432 | Toolkit.getDefaultToolkit().beep(); |
| 433 | setText(oldText); |
| 434 | } |
| 435 | |
| 436 | // Returns true for Cardinal (non-negative) numbers |
| 437 | // Note that the empty string is not allowed |
| 438 | private boolean textIsCardinal(String textToCheck) { |
| 439 | int value = -1; |
| 440 | |
| 441 | try { |
| 442 | value = Integer.parseInt(textToCheck, 10); |
| 443 | return (value >= 0); |
| 444 | } catch (NumberFormatException nfe) { |
| 445 | return false; |
| 446 | } |
| 447 | } |
| 448 | } |