Mercurial > hg > digilib-old
annotate client/digitallibrary/jquery/dlGeometry.js @ 736:54928116a7b2 jquery
merge
| author | hertzhaft |
|---|---|
| date | Wed, 02 Feb 2011 00:25:49 +0100 |
| parents | 25f2898696a2 |
| children | b4460f0a540d |
| rev | line source |
|---|---|
| 606 | 1 /* digilib geometry classes |
| 2 * should be integrated into jquery.digilib.js | |
| 3 */ | |
| 4 | |
| 5 var dlGeometry = function() { | |
| 6 /* | |
| 7 * Size class | |
| 8 */ | |
| 9 var size = function (w, h) { | |
| 10 var that = { | |
| 11 width : parseFloat(w), | |
| 12 height : parseFloat(h) | |
| 13 }; | |
| 14 that.equals = function(other) { | |
| 15 return (this.width === other.width && this.height === other.height); | |
| 16 }; | |
| 17 that.toString = function() { | |
| 18 return (this.width + "x" + this.height); | |
| 19 }; | |
| 20 return that; | |
| 21 }; | |
| 22 | |
| 23 /* | |
| 24 * Position class | |
| 25 */ | |
| 26 var position = function (x, y) { | |
| 654 | 27 if (typeof x === "object") { |
| 28 if (x instanceof jQuery) { | |
| 29 // jQuery object | |
| 30 var pos = x.offset(); | |
| 31 var that = { | |
| 32 x : pos.left, | |
| 33 y : pos.top | |
| 34 }; | |
| 35 } else { | |
| 36 // event object(?) | |
| 37 var that = { | |
| 38 x : x.pageX, | |
| 39 y : x.pageY | |
| 40 }; | |
| 41 } | |
| 42 } else { | |
| 43 var that = { | |
| 44 x : parseFloat(x), | |
| 45 y : parseFloat(y) | |
| 46 }; | |
| 47 } | |
| 730 | 48 that.equals = function (other) { |
| 606 | 49 return (this.x === other.x && this.y === other.y); |
| 50 }; | |
| 733 | 51 // add position other to this |
| 52 that.add = function (other) { | |
| 53 this.x += other.x; | |
| 54 this.y += other.y; | |
| 55 return this; | |
| 56 }; | |
| 730 | 57 // returns new position that is the difference between this and other |
| 58 that.delta = function (other) { | |
| 59 return position(other.x - this.x, other.y - this.y); | |
| 60 }; | |
| 61 // adjusts position $elem to this position | |
| 62 that.adjustDiv = function ($elem) { | |
| 63 $elem.offset({left : this.x, top : this.y}); | |
| 64 }; | |
| 733 | 65 // returns distance of this position to pos (length if pos == null) |
| 66 that.distance = function (pos) { | |
| 67 if (pos == null) { | |
| 68 pos = {x : 0, y : 0}; | |
| 69 } | |
| 70 var dx = pos.x - this.x; | |
| 71 var dy = pos.y - this.y; | |
| 72 return Math.sqrt(dx * dx + dy * dy); | |
| 73 }; | |
| 606 | 74 that.toString = function() { |
| 75 return (this.x + "," + this.y); | |
| 76 }; | |
| 77 return that; | |
| 78 }; | |
| 79 /* | |
| 80 * Rectangle class | |
| 81 */ | |
| 82 var rectangle = function (x, y, w, h) { | |
| 83 var that = {}; | |
| 84 if (typeof x === "object") { | |
| 654 | 85 if (x instanceof jQuery) { |
| 86 // jQuery object | |
| 87 var pos = x.offset(); | |
| 88 that = { | |
| 89 x : pos.left, | |
| 90 y : pos.top, | |
| 91 width : x.width(), | |
| 92 height : x.height() | |
| 93 }; | |
| 94 } else { | |
| 95 // assume x and y are Position | |
| 96 that = { | |
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97 x : Math.min(x.x, y.x), |
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98 y : Math.min(x.y, y.y), |
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99 width : Math.abs(y.x - x.x), |
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100 height : Math.abs(y.y - x.y) |
| 654 | 101 }; |
| 102 } | |
| 606 | 103 } else { |
| 104 that = { | |
| 105 x : parseFloat(x), | |
| 106 y : parseFloat(y), | |
| 107 width : parseFloat(w), | |
| 108 height : parseFloat(h) | |
| 109 }; | |
| 110 } | |
| 111 // returns a copy of this Rectangle | |
| 112 that.copy = function() { | |
| 113 return rectangle(this.x, this.y, this.width, this.height); | |
| 114 }; | |
| 115 // returns the position of this Rectangle | |
| 116 that.getPosition = function() { | |
| 117 return position(this.x, this.y); | |
| 118 }; | |
| 119 // returns the upper left corner position | |
| 120 that.getPt1 = that.getPosition; | |
| 121 // returns the lower right corner position of this Rectangle | |
| 122 that.getPt2 = function() { | |
| 123 return position(this.x + this.width, this.y + this.height); | |
| 124 }; | |
| 733 | 125 // sets the upper left corner position to pos |
| 126 that.setPosition = function(pos) { | |
| 606 | 127 this.x = pos.x; |
| 128 this.y = pos.y; | |
| 129 return this; | |
| 130 }; | |
| 733 | 131 that.setPt1 = that.setPosition; // TODO: not really the same |
| 132 // adds pos to the position | |
| 133 that.addPosition = function(pos) { | |
| 730 | 134 this.x += pos.x; |
| 135 this.y += pos.y; | |
| 136 return this; | |
| 137 }; | |
| 138 // sets the lower right corner to position pos | |
| 606 | 139 that.setPt2 = function(pos) { |
| 140 this.width = pos.x - this.x; | |
| 141 this.height = pos.y - this.y; | |
| 142 return this; | |
| 143 }; | |
| 730 | 144 // returns the center position of this Rectangle |
| 606 | 145 that.getCenter = function() { |
| 146 return position(this.x + this.width / 2, this.y + this.height / 2); | |
| 147 }; | |
| 730 | 148 // moves this Rectangle's center to position pos |
| 606 | 149 that.setCenter = function(pos) { |
| 150 this.x = pos.x - this.width / 2; | |
| 151 this.y = pos.y - this.height / 2; | |
| 152 return this; | |
| 153 }; | |
| 730 | 154 // returns the size of this Rectangle |
| 606 | 155 that.getSize = function() { |
| 156 return size(this.width, this.height); | |
| 157 }; | |
| 158 that.equals = function(other) { | |
| 159 // equal props | |
| 160 var eq = (this.x === other.x && this.y === other.y && | |
| 161 this.width === other.width); | |
| 162 return eq; | |
| 163 }; | |
| 730 | 164 // returns the area of this Rectangle |
| 606 | 165 that.getArea = function() { |
| 166 return (this.width * this.height); | |
| 167 }; | |
| 730 | 168 // eliminates negative width and height |
| 606 | 169 that.normalize = function() { |
| 170 var p = this.getPt2(); | |
| 171 this.x = Math.min(this.x, p.x); | |
| 172 this.y = Math.min(this.y, p.y); | |
| 173 this.width = Math.abs(this.width); | |
| 174 this.height = Math.abs(this.height); | |
| 175 return this; | |
| 176 }; | |
| 730 | 177 // returns if Position "pos" lies inside of this rectangle |
| 606 | 178 that.containsPosition = function(pos) { |
| 179 var ct = ((pos.x >= this.x) && (pos.y >= this.y) && | |
| 654 | 180 (pos.x <= this.x + this.width) && (pos.y <= this.y + this.height)); |
| 606 | 181 return ct; |
| 182 }; | |
| 730 | 183 // returns if rectangle "rect" is contained in this rectangle |
| 606 | 184 that.containsRect = function(rect) { |
| 185 return (this.containsPosition(rect.getPt1()) && this.containsPosition(rect.getPt2())); | |
| 186 }; | |
| 730 | 187 // changes this rectangle's x/y values so it stays inside of rectangle rect |
| 188 // keeping the proportions | |
| 606 | 189 that.stayInside = function(rect) { |
| 190 if (this.x < rect.x) { | |
| 191 this.x = rect.x; | |
| 192 } | |
| 193 if (this.y < rect.y) { | |
| 194 this.y = rect.y; | |
| 195 } | |
| 196 if (this.x + this.width > rect.x + rect.width) { | |
| 197 this.x = rect.x + rect.width - this.width; | |
| 198 } | |
| 199 if (this.y + this.height > rect.y + rect.height) { | |
| 200 this.y = rect.y + rect.height - this.height; | |
| 201 } | |
| 202 return this; | |
| 203 }; | |
| 730 | 204 // clips this rectangle so it stays inside of rectangle rect |
| 606 | 205 that.clipTo = function(rect) { |
| 206 var p1 = rect.getPt1(); | |
| 207 var p2 = rect.getPt2(); | |
| 208 var this2 = this.getPt2(); | |
| 209 this.setPt1(position(Math.max(this.x, p1.x), Math.max(this.y, p1.y))); | |
| 210 this.setPt2(position(Math.min(this2.x, p2.x), Math.min(this2.y, p2.y))); | |
| 211 return this; | |
| 212 }; | |
| 730 | 213 // returns the intersection of the given Rectangle and this one |
| 606 | 214 that.intersect = function(rect) { |
| 215 // FIX ME: not really, it should return null if there is no overlap | |
| 216 var sec = rect.copy(); | |
| 217 if (sec.x < this.x) { | |
| 218 sec.width = sec.width - (this.x - sec.x); | |
| 219 sec.x = this.x; | |
| 220 } | |
| 221 if (sec.y < this.y) { | |
| 222 sec.height = sec.height - (this.y - sec.y); | |
| 223 sec.y = this.y; | |
| 224 } | |
| 225 if (sec.x + sec.width > this.x + this.width) { | |
| 226 sec.width = (this.x + this.width) - sec.x; | |
| 227 } | |
| 228 if (sec.y + sec.height > this.y + this.height) { | |
| 229 sec.height = (this.y + this.height) - sec.y; | |
| 230 } | |
| 231 return sec; | |
| 232 }; | |
| 730 | 233 // returns a Rectangle that fits into this one (by moving first) |
| 606 | 234 that.fit = function(rect) { |
| 235 var sec = rect.copy(); | |
| 236 sec.x = Math.max(sec.x, this.x); | |
| 237 sec.y = Math.max(sec.y, this.x); | |
| 238 if (sec.x + sec.width > this.x + this.width) { | |
| 239 sec.x = this.x + this.width - sec.width; | |
| 240 } | |
| 241 if (sec.y + sec.height > this.y + this.height) { | |
| 242 sec.y = this.y + this.height - sec.height; | |
| 243 } | |
| 244 return sec.intersect(this); | |
| 245 }; | |
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246 // adjusts position and size of $elem to this rectangle |
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247 that.adjustDiv = function ($elem) { |
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248 $elem.offset({left : this.x, top : this.y}); |
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249 $elem.width(this.width).height(this.height); |
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250 }; |
| 606 | 251 that.toString = function() { |
| 252 return this.width+"x"+this.height+"@"+this.x+","+this.y; | |
| 253 }; | |
| 254 return that; | |
| 255 }; | |
| 256 | |
| 257 /* | |
| 258 * Transform class | |
| 259 * | |
| 260 * defines a class of affine transformations | |
| 261 */ | |
| 262 var transform = function (spec) { | |
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263 var that = { |
| 627 | 264 m00 : 1.0, |
| 265 m01 : 0.0, | |
| 266 m02 : 0.0, | |
| 267 m10 : 0.0, | |
| 268 m11 : 1.0, | |
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269 m12 : 0.0, |
| 627 | 270 m20 : 0.0, |
| 271 m21 : 0.0, | |
| 272 m22 : 1.0 | |
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273 }; |
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274 if (spec) { |
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275 jQuery.extend(that, spec); |
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276 }; |
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277 that.concat = function(trafA) { |
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278 // add Transform trafA to this Transform (i.e. this = trafC = trafA * this) |
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279 var trafC = {}; |
| 606 | 280 for (var i = 0; i < 3; i++) { |
| 281 for (var j = 0; j < 3; j++) { | |
| 282 var c = 0.0; | |
| 283 for (var k = 0; k < 3; k++) { | |
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284 c += trafA["m"+i+k] * this["m"+k+j]; |
| 606 | 285 } |
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286 trafC["m"+i+j] = c; |
| 606 | 287 } |
| 288 } | |
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289 jQuery.extend(this, trafC); |
| 606 | 290 return this; |
| 291 }; | |
| 292 that.transform = function(rect) { | |
| 293 // returns transformed Rectangle or Position with this Transform applied | |
| 294 var x = this.m00 * rect.x + this.m01 * rect.y + this.m02; | |
| 295 var y = this.m10 * rect.x + this.m11 * rect.y + this.m12; | |
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296 var pt = position(x, y); |
| 606 | 297 if (rect.width) { |
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298 // transform the other corner point |
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299 var pt2 = this.transform(rect.getPt2()); |
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300 return rectangle(pt, pt2); |
| 606 | 301 } |
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302 return pt; |
| 606 | 303 }; |
| 304 that.invtransform = function(rect) { | |
| 305 // returns transformed Rectangle or Position with the inverse of this Transform applied | |
| 306 var det = this.m00 * this.m11 - this.m01 * this.m10; | |
| 307 var x = (this.m11 * rect.x - this.m01 * rect.y - this.m11 * this.m02 + this.m01 * this.m12) / det; | |
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308 var y = (-this.m10 * rect.x + this.m00 * rect.y + this.m10 * this.m02 - this.m00 * this.m12) / det; |
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309 var pt = position(x, y); |
| 606 | 310 if (rect.width) { |
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311 // transform the other corner point |
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312 var pt2 = this.invtransform(rect.getPt2()); |
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313 return rectangle(pt, pt2); |
| 606 | 314 } |
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315 return pt; |
| 606 | 316 }; |
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317 that.toString = function (pretty) { |
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318 var s = '['; |
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319 if (pretty) s += '\n'; |
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320 for (var i = 0; i < 3; ++i) { |
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321 s += '['; |
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322 for (var j = 0; j < 3; ++j) { |
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323 if (j) s += ','; |
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324 s += this['m'+i+j]; |
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325 } |
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326 s += ']'; |
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327 if (pretty) s += '\n'; |
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328 } |
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329 s += ']'; |
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330 if (pretty) s += '\n'; |
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331 return s; |
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332 }; |
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333 // add class methods to instance |
| 627 | 334 that.getRotation = transform.getRotation; |
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335 that.getRotationAround = transform.getRotationAround; |
| 627 | 336 that.getTranslation = transform.getTranslation; |
| 675 | 337 that.getMirror = transform.getMirror; |
| 627 | 338 that.getScale = transform.getScale; |
| 655 | 339 |
| 606 | 340 return that; |
| 341 }; | |
| 342 | |
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343 transform.getRotation = function (angle) { |
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344 // returns a Transform that is a rotation by angle degrees around [0,0] |
| 606 | 345 if (angle !== 0) { |
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346 var t = Math.PI * parseFloat(angle) / 180.0; |
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347 var cost = Math.cos(t); |
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348 var sint = Math.sin(t); |
| 606 | 349 var traf = { |
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350 m00 : cost, |
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351 m01 : -sint, |
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352 m10 : sint, |
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work on getting transformation to work with rotation (currently still doesn't)
robcast
parents:
656
diff
changeset
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353 m11 : cost |
| 606 | 354 }; |
| 355 return transform(traf); | |
| 356 } | |
| 357 return transform(); | |
| 358 }; | |
| 359 | |
| 675 | 360 transform.getRotationAround = function (angle, pos) { |
| 361 // returns a Transform that is a rotation by angle degrees around pos | |
| 362 var traf = transform.getTranslation({x : -pos.x, y : -pos.y}); | |
| 363 traf.concat(transform.getRotation(angle)); | |
| 364 traf.concat(transform.getTranslation(pos)); | |
| 365 return traf; | |
| 366 }; | |
| 367 | |
| 606 | 368 transform.getTranslation = function (pos) { |
| 369 // returns a Transform that is a translation by [pos.x, pos,y] | |
| 370 var traf = { | |
| 371 m02 : pos.x, | |
| 372 m12 : pos.y | |
| 373 }; | |
| 374 return transform(traf); | |
| 375 }; | |
| 376 | |
| 675 | 377 transform.getMirror = function (type) { |
| 378 // returns a Transform that is a mirror about the axis type | |
| 379 if (type === 'x') { | |
| 380 var traf = { | |
| 381 m00 : 1, | |
| 382 m11 : -1 | |
| 383 }; | |
| 384 } else { | |
| 385 var traf = { | |
| 386 m00 : -1, | |
| 387 m11 : 1 | |
| 388 }; | |
| 389 } | |
| 390 return transform(traf); | |
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664
d5a5ee4cbf04
work on getting transformation to work with rotation (currently still doesn't)
robcast
parents:
656
diff
changeset
|
391 }; |
| 675 | 392 |
| 606 | 393 transform.getScale = function (size) { |
| 394 // returns a Transform that is a scale by [size.width, size.height] | |
| 395 var traf = { | |
| 396 m00 : size.width, | |
| 397 m11 : size.height | |
| 398 }; | |
| 399 return transform(traf); | |
| 400 }; | |
| 401 | |
| 402 // export functions | |
| 403 var that = { | |
| 404 size : size, | |
| 405 position : position, | |
| 406 rectangle : rectangle, | |
| 407 transform : transform | |
| 408 }; | |
| 409 | |
| 410 return that; | |
| 411 }; |