001 /* RoundRectangle2D.java -- represents a rectangle with rounded corners 002 Copyright (C) 2000, 2002, 2003, 2004, 2006, Free Software Foundation 003 004 This file is part of GNU Classpath. 005 006 GNU Classpath is free software; you can redistribute it and/or modify 007 it under the terms of the GNU General Public License as published by 008 the Free Software Foundation; either version 2, or (at your option) 009 any later version. 010 011 GNU Classpath is distributed in the hope that it will be useful, but 012 WITHOUT ANY WARRANTY; without even the implied warranty of 013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014 General Public License for more details. 015 016 You should have received a copy of the GNU General Public License 017 along with GNU Classpath; see the file COPYING. If not, write to the 018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 019 02110-1301 USA. 020 021 Linking this library statically or dynamically with other modules is 022 making a combined work based on this library. Thus, the terms and 023 conditions of the GNU General Public License cover the whole 024 combination. 025 026 As a special exception, the copyright holders of this library give you 027 permission to link this library with independent modules to produce an 028 executable, regardless of the license terms of these independent 029 modules, and to copy and distribute the resulting executable under 030 terms of your choice, provided that you also meet, for each linked 031 independent module, the terms and conditions of the license of that 032 module. An independent module is a module which is not derived from 033 or based on this library. If you modify this library, you may extend 034 this exception to your version of the library, but you are not 035 obligated to do so. If you do not wish to do so, delete this 036 exception statement from your version. */ 037 038 package java.awt.geom; 039 040 041 042 /** This class implements a rectangle with rounded corners. 043 * @author Tom Tromey (tromey@cygnus.com) 044 * @date December 3, 2000 045 */ 046 public abstract class RoundRectangle2D extends RectangularShape 047 { 048 /** 049 * Return the arc height of this round rectangle. The arc height and width 050 * control the roundness of the corners of the rectangle. 051 * 052 * @return The arc height. 053 * 054 * @see #getArcWidth() 055 */ 056 public abstract double getArcHeight(); 057 058 /** 059 * Return the arc width of this round rectangle. The arc width and height 060 * control the roundness of the corners of the rectangle. 061 * 062 * @return The arc width. 063 * 064 * @see #getArcHeight() 065 */ 066 public abstract double getArcWidth(); 067 068 /** 069 * Set the values of this round rectangle. 070 * 071 * @param x The x coordinate 072 * @param y The y coordinate 073 * @param w The width 074 * @param h The height 075 * @param arcWidth The arc width 076 * @param arcHeight The arc height 077 */ 078 public abstract void setRoundRect(double x, double y, double w, double h, 079 double arcWidth, double arcHeight); 080 081 /** 082 * Create a RoundRectangle2D. This is protected because this class 083 * is abstract and cannot be instantiated. 084 */ 085 protected RoundRectangle2D() 086 { 087 } 088 089 /** 090 * Return true if this object contains the specified point. 091 * @param x The x coordinate 092 * @param y The y coordinate 093 */ 094 public boolean contains(double x, double y) 095 { 096 double mx = getX(); 097 double mw = getWidth(); 098 if (x < mx || x >= mx + mw) 099 return false; 100 double my = getY(); 101 double mh = getHeight(); 102 if (y < my || y >= my + mh) 103 return false; 104 105 // Now check to see if the point is in range of an arc. 106 double dy = Math.min(Math.abs(my - y), Math.abs(my + mh - y)); 107 double dx = Math.min(Math.abs(mx - x), Math.abs(mx + mw - x)); 108 109 // The arc dimensions are that of the corresponding ellipse 110 // thus a 90 degree segment is half of that. 111 double aw = getArcWidth() / 2.0; 112 double ah = getArcHeight() / 2.0; 113 if (dx > aw || dy > ah) 114 return true; 115 116 // At this point DX represents the distance from the nearest edge 117 // of the rectangle. But we want to transform it to represent the 118 // scaled distance from the center of the ellipse that forms the 119 // arc. Hence this code: 120 dy = (ah - dy) / ah; 121 dx = (aw - dx) / aw; 122 123 return dx * dx + dy * dy <= 1.0; 124 } 125 126 /** 127 * Return true if this object contains the specified rectangle 128 * @param x The x coordinate 129 * @param y The y coordinate 130 * @param w The width 131 * @param h The height 132 */ 133 public boolean contains(double x, double y, double w, double h) 134 { 135 // We have to check all four points here (for ordinary rectangles 136 // we can just check opposing corners). 137 return (contains(x, y) && contains(x, y + h) && contains(x + w, y + h) 138 && contains(x + w, y)); 139 } 140 141 /** 142 * Return a new path iterator which iterates over this rectangle. 143 * 144 * @param at An affine transform to apply to the object 145 */ 146 public PathIterator getPathIterator(final AffineTransform at) 147 { 148 double arcW = Math.min(getArcWidth(), getWidth()); 149 double arcH = Math.min(getArcHeight(), getHeight()); 150 151 // check for special cases... 152 if (arcW <= 0 || arcH <= 0) 153 { 154 Rectangle2D r = new Rectangle2D.Double(getX(), getY(), getWidth(), 155 getHeight()); 156 return r.getPathIterator(at); 157 } 158 else if (arcW >= getWidth() && arcH >= getHeight()) 159 { 160 Ellipse2D e = new Ellipse2D.Double(getX(), getY(), getWidth(), 161 getHeight()); 162 return e.getPathIterator(at); 163 } 164 165 // otherwise return the standard case... 166 return new PathIterator() 167 { 168 double x = getX(); 169 double y = getY(); 170 double w = getWidth(); 171 double h = getHeight(); 172 double arcW = Math.min(getArcWidth(), w); 173 double arcH = Math.min(getArcHeight(), h); 174 Arc2D.Double arc = new Arc2D.Double(); 175 PathIterator corner; 176 int step = -1; 177 178 public int currentSegment(double[] coords) 179 { 180 if (corner != null) // steps 1, 3, 5 and 7 181 { 182 int r = corner.currentSegment(coords); 183 if (r == SEG_MOVETO) 184 r = SEG_LINETO; 185 return r; 186 } 187 if (step == -1) 188 { 189 // move to the start position 190 coords[0] = x + w - arcW / 2; 191 coords[1] = y; 192 } 193 else if (step == 0) 194 { 195 // top line 196 coords[0] = x + arcW / 2; 197 coords[1] = y; 198 } 199 else if (step == 2) 200 { 201 // left line 202 coords[0] = x; 203 coords[1] = y + h - arcH / 2; 204 } 205 else if (step == 4) 206 { 207 // bottom line 208 coords[0] = x + w - arcW / 2; 209 coords[1] = y + h; 210 } 211 else if (step == 6) 212 { 213 // right line 214 coords[0] = x + w; 215 coords[1] = y + arcH / 2; 216 } 217 if (at != null) 218 at.transform(coords, 0, coords, 0, 1); 219 return step == -1 ? SEG_MOVETO : SEG_LINETO; 220 } 221 222 public int currentSegment(float[] coords) { 223 if (corner != null) // steps 1, 3, 5 and 7 224 { 225 int r = corner.currentSegment(coords); 226 if (r == SEG_MOVETO) 227 r = SEG_LINETO; 228 return r; 229 } 230 if (step == -1) 231 { 232 // move to the start position 233 coords[0] = (float) (x + w - arcW / 2); 234 coords[1] = (float) y; 235 } 236 else if (step == 0) 237 { 238 // top line 239 coords[0] = (float) (x + arcW / 2); 240 coords[1] = (float) y; 241 } 242 else if (step == 2) 243 { 244 // left line 245 coords[0] = (float) x; 246 coords[1] = (float) (y + h - arcH / 2); 247 } 248 else if (step == 4) 249 { 250 // bottom line 251 coords[0] = (float) (x + w - arcW / 2); 252 coords[1] = (float) (y + h); 253 } 254 else if (step == 6) 255 { 256 // right line 257 coords[0] = (float) (x + w); 258 coords[1] = (float) (y + arcH / 2); 259 } 260 if (at != null) 261 at.transform(coords, 0, coords, 0, 1); 262 return step == -1 ? SEG_MOVETO : SEG_LINETO; 263 } 264 265 public int getWindingRule() { 266 return WIND_NON_ZERO; 267 } 268 269 public boolean isDone() { 270 return step >= 8; 271 } 272 273 public void next() 274 { 275 if (corner != null) 276 { 277 corner.next(); 278 if (corner.isDone()) 279 { 280 corner = null; 281 step++; 282 } 283 } 284 else 285 { 286 step++; 287 if (step == 1) 288 { 289 // create top left corner 290 arc.setArc(x, y, arcW, arcH, 90, 90, Arc2D.OPEN); 291 corner = arc.getPathIterator(at); 292 } 293 else if (step == 3) 294 { 295 // create bottom left corner 296 arc.setArc(x, y + h - arcH, arcW, arcH, 180, 90, 297 Arc2D.OPEN); 298 corner = arc.getPathIterator(at); 299 } 300 else if (step == 5) 301 { 302 // create bottom right corner 303 arc.setArc(x + w - arcW, y + h - arcH, arcW, arcH, 270, 90, 304 Arc2D.OPEN); 305 corner = arc.getPathIterator(at); 306 } 307 else if (step == 7) 308 { 309 // create top right corner 310 arc.setArc(x + w - arcW, y, arcW, arcH, 0, 90, Arc2D.OPEN); 311 corner = arc.getPathIterator(at); 312 } 313 } 314 } 315 }; 316 } 317 318 /** 319 * Return true if the given rectangle intersects this shape. 320 * @param x The x coordinate 321 * @param y The y coordinate 322 * @param w The width 323 * @param h The height 324 */ 325 public boolean intersects(double x, double y, double w, double h) 326 { 327 // Check if any corner is within the rectangle 328 return (contains(x, y) || contains(x, y + h) || contains(x + w, y + h) 329 || contains(x + w, y)); 330 } 331 332 /** 333 * Set the boundary of this round rectangle. 334 * @param x The x coordinate 335 * @param y The y coordinate 336 * @param w The width 337 * @param h The height 338 */ 339 public void setFrame(double x, double y, double w, double h) 340 { 341 // This is a bit lame. 342 setRoundRect(x, y, w, h, getArcWidth(), getArcHeight()); 343 } 344 345 /** 346 * Set the values of this round rectangle to be the same as those 347 * of the argument. 348 * @param rr The round rectangle to copy 349 */ 350 public void setRoundRect(RoundRectangle2D rr) 351 { 352 setRoundRect(rr.getX(), rr.getY(), rr.getWidth(), rr.getHeight(), 353 rr.getArcWidth(), rr.getArcHeight()); 354 } 355 356 /** 357 * A subclass of RoundRectangle which keeps its parameters as 358 * doubles. 359 */ 360 public static class Double extends RoundRectangle2D 361 { 362 /** The height of the corner arc. */ 363 public double archeight; 364 365 /** The width of the corner arc. */ 366 public double arcwidth; 367 368 /** The x coordinate of this object. */ 369 public double x; 370 371 /** The y coordinate of this object. */ 372 public double y; 373 374 /** The width of this object. */ 375 public double width; 376 377 /** The height of this object. */ 378 public double height; 379 380 /** 381 * Construct a new instance, with all parameters set to 0. 382 */ 383 public Double() 384 { 385 } 386 387 /** 388 * Construct a new instance with the given arguments. 389 * @param x The x coordinate 390 * @param y The y coordinate 391 * @param w The width 392 * @param h The height 393 * @param arcWidth The arc width 394 * @param arcHeight The arc height 395 */ 396 public Double(double x, double y, double w, double h, double arcWidth, 397 double arcHeight) 398 { 399 this.x = x; 400 this.y = y; 401 this.width = w; 402 this.height = h; 403 this.arcwidth = arcWidth; 404 this.archeight = arcHeight; 405 } 406 407 public double getArcHeight() 408 { 409 return archeight; 410 } 411 412 public double getArcWidth() 413 { 414 return arcwidth; 415 } 416 417 public Rectangle2D getBounds2D() 418 { 419 return new Rectangle2D.Double(x, y, width, height); 420 } 421 422 public double getX() 423 { 424 return x; 425 } 426 427 public double getY() 428 { 429 return y; 430 } 431 432 public double getWidth() 433 { 434 return width; 435 } 436 437 public double getHeight() 438 { 439 return height; 440 } 441 442 public boolean isEmpty() 443 { 444 return width <= 0 || height <= 0; 445 } 446 447 public void setRoundRect(double x, double y, double w, double h, 448 double arcWidth, double arcHeight) 449 { 450 this.x = x; 451 this.y = y; 452 this.width = w; 453 this.height = h; 454 this.arcwidth = arcWidth; 455 this.archeight = arcHeight; 456 } 457 } // class Double 458 459 /** 460 * A subclass of RoundRectangle which keeps its parameters as 461 * floats. 462 */ 463 public static class Float extends RoundRectangle2D 464 { 465 /** The height of the corner arc. */ 466 public float archeight; 467 468 /** The width of the corner arc. */ 469 public float arcwidth; 470 471 /** The x coordinate of this object. */ 472 public float x; 473 474 /** The y coordinate of this object. */ 475 public float y; 476 477 /** The width of this object. */ 478 public float width; 479 480 /** The height of this object. */ 481 public float height; 482 483 /** 484 * Construct a new instance, with all parameters set to 0. 485 */ 486 public Float() 487 { 488 } 489 490 /** 491 * Construct a new instance with the given arguments. 492 * @param x The x coordinate 493 * @param y The y coordinate 494 * @param w The width 495 * @param h The height 496 * @param arcWidth The arc width 497 * @param arcHeight The arc height 498 */ 499 public Float(float x, float y, float w, float h, float arcWidth, 500 float arcHeight) 501 { 502 this.x = x; 503 this.y = y; 504 this.width = w; 505 this.height = h; 506 this.arcwidth = arcWidth; 507 this.archeight = arcHeight; 508 } 509 510 public double getArcHeight() 511 { 512 return archeight; 513 } 514 515 public double getArcWidth() 516 { 517 return arcwidth; 518 } 519 520 public Rectangle2D getBounds2D() 521 { 522 return new Rectangle2D.Float(x, y, width, height); 523 } 524 525 public double getX() 526 { 527 return x; 528 } 529 530 public double getY() 531 { 532 return y; 533 } 534 535 public double getWidth() 536 { 537 return width; 538 } 539 540 public double getHeight() 541 { 542 return height; 543 } 544 545 public boolean isEmpty() 546 { 547 return width <= 0 || height <= 0; 548 } 549 550 /** 551 * Sets the dimensions for this rounded rectangle. 552 * 553 * @param x the x-coordinate of the top left corner. 554 * @param y the y-coordinate of the top left corner. 555 * @param w the width of the rectangle. 556 * @param h the height of the rectangle. 557 * @param arcWidth the arc width. 558 * @param arcHeight the arc height. 559 * 560 * @see #setRoundRect(double, double, double, double, double, double) 561 */ 562 public void setRoundRect(float x, float y, float w, float h, 563 float arcWidth, float arcHeight) 564 { 565 this.x = x; 566 this.y = y; 567 this.width = w; 568 this.height = h; 569 this.arcwidth = arcWidth; 570 this.archeight = arcHeight; 571 } 572 573 public void setRoundRect(double x, double y, double w, double h, 574 double arcWidth, double arcHeight) 575 { 576 this.x = (float) x; 577 this.y = (float) y; 578 this.width = (float) w; 579 this.height = (float) h; 580 this.arcwidth = (float) arcWidth; 581 this.archeight = (float) arcHeight; 582 } 583 } // class Float 584 } // class RoundRectangle2D