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annotate js/bt/other_libs/excanvas_0002/examples/example3.html @ 18:0d557e6e73f7

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Added beautytips and some additional event handling code to the library.
author David Eads <eads@chicagotech.org>
date Fri, 06 Mar 2009 14:11:46 -0600
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eads@18 1 <!DOCTYPE html>
eads@18 2
eads@18 3 <!--
eads@18 4
eads@18 5 Copyright 2006 Google Inc.
eads@18 6
eads@18 7 Licensed under the Apache License, Version 2.0 (the "License");
eads@18 8 you may not use this file except in compliance with the License.
eads@18 9 You may obtain a copy of the License at
eads@18 10
eads@18 11 http://www.apache.org/licenses/LICENSE-2.0
eads@18 12
eads@18 13 Unless required by applicable law or agreed to in writing, software
eads@18 14 distributed under the License is distributed on an "AS IS" BASIS,
eads@18 15 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
eads@18 16 See the License for the specific language governing permissions and
eads@18 17 limitations under the License.
eads@18 18
eads@18 19 -->
eads@18 20
eads@18 21 <html>
eads@18 22 <head>
eads@18 23 <title></title>
eads@18 24 <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
eads@18 25 <!--[if IE]><script type="text/javascript" src="../excanvas.js"></script><![endif]-->
eads@18 26 <style type="text/css">
eads@18 27
eads@18 28 body {
eads@18 29 overflow: hidden;
eads@18 30 width: 100%;
eads@18 31 height: 100%;
eads@18 32 margin: 0;
eads@18 33 }
eads@18 34
eads@18 35 #image-rotator {
eads@18 36 position: absolute;
eads@18 37 left: 0;
eads@18 38 top: 0;
eads@18 39 width: 100%;
eads@18 40 height: 100%;
eads@18 41 }
eads@18 42
eads@18 43 #image-rotator .tool-bar {
eads@18 44 text-align: center;
eads@18 45 }
eads@18 46
eads@18 47 .tool-bar button {
eads@18 48 margin: 0.5em 0.5em 0 0;
eads@18 49 }
eads@18 50
eads@18 51 #image-rotator img,
eads@18 52 #image-rotator canvas {
eads@18 53 position: absolute;
eads@18 54 }
eads@18 55
eads@18 56 </style>
eads@18 57 <script type="text/javascript">
eads@18 58
eads@18 59 function sawFunc(a) {
eads@18 60 var PI = Math.PI;
eads@18 61 var PI2 = PI / 2;
eads@18 62 // make sure a is within 0 to PI
eads@18 63 a = a % PI;
eads@18 64 if (a < 0) {
eads@18 65 a += PI;
eads@18 66 }
eads@18 67 if (a < PI2) {
eads@18 68 return a / PI2;
eads@18 69 } else {
eads@18 70 return (PI - a) / PI2;
eads@18 71 }
eads@18 72 }
eads@18 73
eads@18 74 function easeInEaseOut(t) {
eads@18 75 var t2 = t * t;
eads@18 76 return 3 * t2 - 2 * t * t2;
eads@18 77 }
eads@18 78
eads@18 79 function ImageRotator(el, src, w, h) {
eads@18 80 this.element = el;
eads@18 81 this.toolBar = el.getElementsByTagName("div")[0];
eads@18 82 this.canvas = el.getElementsByTagName("canvas")[0];
eads@18 83 var images = el.getElementsByTagName("img");
eads@18 84 this.image = images[images.length - 1];
eads@18 85 var btns = el.getElementsByTagName("button");
eads@18 86 this.btnCw = btns[0];
eads@18 87 this.btnCcw = btns[1];
eads@18 88 var self = this;
eads@18 89 this.btnCcw.onclick = function () {
eads@18 90 self.rotateCcw();
eads@18 91 };
eads@18 92 this.btnCw.onclick = function () {
eads@18 93 self.rotateCw();
eads@18 94 };
eads@18 95 this.image.onload = function (e) {
eads@18 96 self.onImageLoad(e);
eads@18 97 };
eads@18 98 this.image.onerror = function (e) {
eads@18 99 self.onImageError(e);
eads@18 100 };
eads@18 101 this.image.onabort = function (e) {
eads@18 102 self.onImageAbort(e);
eads@18 103 };
eads@18 104 this.setImage(src, w, h);
eads@18 105 this.layout();
eads@18 106
eads@18 107 var onResize = function () {
eads@18 108 self.layout();
eads@18 109 };
eads@18 110 var onLoad = function () {
eads@18 111 self.onWindowLoad();
eads@18 112 };
eads@18 113 if (window.addEventListener) {
eads@18 114 window.addEventListener("resize", onResize, false);
eads@18 115 window.addEventListener("load", onLoad, false);
eads@18 116 } else if (window.attachEvent) {
eads@18 117 window.attachEvent("onresize", onResize);
eads@18 118 window.attachEvent("onload", onLoad);
eads@18 119 }
eads@18 120 }
eads@18 121
eads@18 122 ImageRotator.prototype = {
eads@18 123 getLoaded: function () {
eads@18 124 return this.imageLoaded && this.windowLoaded;
eads@18 125 },
eads@18 126 setImage: function (src, w, h) {
eads@18 127 this.imageLoaded = false;
eads@18 128 this.image.src = src;
eads@18 129 this.imageWidth = w;
eads@18 130 this.imageHeight = h;
eads@18 131 },
eads@18 132
eads@18 133 layout: function () {
eads@18 134 var PI2 = Math.PI / 2;
eads@18 135 var h = this.element.clientHeight;
eads@18 136 var w = this.element.clientWidth;
eads@18 137 var th = this.toolBar.offsetHeight;
eads@18 138 h -= this.toolBar.offsetHeight;
eads@18 139 if (!this.ctx || !this.getLoaded()) {
eads@18 140 this.btnCw.disabled = true;
eads@18 141 this.btnCcw.disabled = true;
eads@18 142 this.canvas.style.display = "none";
eads@18 143 this.image.style.display = "block";
eads@18 144 var ratio = Math.min(w / this.imageWidth, h / this.imageHeight, 1);
eads@18 145 var imgW = this.imageWidth * ratio;
eads@18 146 var imgH = this.imageHeight * ratio;
eads@18 147 var y = th + (h - imgH) / 2;
eads@18 148 var x = (w - imgW) / 2;
eads@18 149 this.image.style.left = Math.round(x) + "px";
eads@18 150 this.image.style.top = Math.round(y) + "px";
eads@18 151 this.image.style.width = Math.round(imgW) + "px";
eads@18 152 this.image.style.height = Math.round(imgH) + "px";
eads@18 153 } else {
eads@18 154 this.btnCw.disabled = this.isAnimating_;
eads@18 155 this.btnCcw.disabled = this.isAnimating_;
eads@18 156 this.canvas.style.display = "block";
eads@18 157 this.image.style.display = "none";
eads@18 158
eads@18 159 this.canvas.style.left = 0 + "px";
eads@18 160 this.canvas.style.top = th + "px";
eads@18 161 this.canvas.style.width = w + "px";
eads@18 162 this.canvas.width = w;
eads@18 163 this.canvas.style.height = h + "px";
eads@18 164 this.canvas.height = h;
eads@18 165
eads@18 166 this.ctx.save();
eads@18 167 this.ctx.clearRect(0, 0, w, h);
eads@18 168 this.ctx.translate(w / 2, h / 2);
eads@18 169 this.ctx.rotate(this.rotation);
eads@18 170 // 0 -> 1, sin(0) = 0
eads@18 171 // PI / 2 -> H / W, sin(PI/2) = 1
eads@18 172
eads@18 173 // sin(PI/2) = 1 -> limit factor is w and imgH
eads@18 174
eads@18 175 var iw = this.imageWidth;
eads@18 176 var ih = this.imageHeight;
eads@18 177 var scale;
eads@18 178 if (iw <= w && iw <= h && ih <= h && ih <= w) {
eads@18 179 scale = 1;
eads@18 180 } else {
eads@18 181 var sinr = sawFunc(this.rotation);
eads@18 182 var cosr = sawFunc(this.rotation + PI2);
eads@18 183 var ratio1 = sinr * Math.min(w / ih, h / iw);
eads@18 184 var ratio2 = cosr * Math.min(w / iw, h / ih);
eads@18 185 var ratio = Math.min(1, ratio1 + ratio2);
eads@18 186 scale = ratio;
eads@18 187 }
eads@18 188 this.ctx.scale(scale, scale);
eads@18 189 this.ctx.translate(-iw / 2, -ih / 2);
eads@18 190 this.ctx.drawImage(this.image, 0, 0, iw, ih);
eads@18 191 this.ctx.restore();
eads@18 192 }
eads@18 193 },
eads@18 194
eads@18 195 rotation: 0,
eads@18 196 animationDuration: 500,
eads@18 197
eads@18 198 rotateCcw: function () {
eads@18 199 if (!this.isAnimating_) {
eads@18 200 this.startTime_ = (new Date).valueOf();
eads@18 201 this.currentAngle_ = this.rotation;
eads@18 202 this.deltaAngle_ = Math.PI / 2;
eads@18 203 this.isAnimating_ = true;
eads@18 204 this.animCounter_ = 0;
eads@18 205 this.rotate_();
eads@18 206 }
eads@18 207 },
eads@18 208
eads@18 209 rotateCw: function () {
eads@18 210 if (!this.isAnimating_) {
eads@18 211 this.startTime_ = (new Date).valueOf();
eads@18 212 this.currentAngle_ = this.rotation;
eads@18 213 this.deltaAngle_ = -Math.PI / 2;
eads@18 214 this.isAnimating_ = true;
eads@18 215 this.animCounter_ = 0;
eads@18 216 this.rotate_();
eads@18 217 }
eads@18 218 },
eads@18 219
eads@18 220 rotate_: function () {
eads@18 221 if (this.isAnimating_) {
eads@18 222 var t = easeInEaseOut(Math.min(1, (new Date - this.startTime_) /
eads@18 223 this.animationDuration));
eads@18 224 this.rotation = t * this.deltaAngle_ + this.currentAngle_;
eads@18 225 if (t < 1) {
eads@18 226 var self = this;
eads@18 227 window.setTimeout(function () {
eads@18 228 self.rotate_();
eads@18 229 }, 10);
eads@18 230 } else {
eads@18 231 this.isAnimating_ = false;
eads@18 232 }
eads@18 233 this.layout();
eads@18 234 }
eads@18 235 },
eads@18 236
eads@18 237 onImageLoad: function (e) {
eads@18 238 this.imageLoaded = true;
eads@18 239 this.initCanvas();
eads@18 240 },
eads@18 241 onImageError: function (e) {
eads@18 242 this.imageLoaded = false;
eads@18 243 },
eads@18 244 onImageAbort: function (e) {
eads@18 245 this.imageLoaded = false;
eads@18 246 },
eads@18 247 onWindowLoad: function (e) {
eads@18 248 this.windowLoaded = true;
eads@18 249 this.initCanvas();
eads@18 250 },
eads@18 251
eads@18 252 initCanvas: function () {
eads@18 253 if (!this.ctx && this.getLoaded()) {
eads@18 254 // IE recreates the element?
eads@18 255 this.canvas = this.element.getElementsByTagName("canvas")[0];
eads@18 256 this.ctx = this.canvas.getContext("2d");
eads@18 257
eads@18 258 if (!this.ctx) {
eads@18 259 return;
eads@18 260 }
eads@18 261 this.layout();
eads@18 262 }
eads@18 263 }
eads@18 264 };
eads@18 265
eads@18 266 </script>
eads@18 267 </head>
eads@18 268 <body>
eads@18 269
eads@18 270 <div id="image-rotator">
eads@18 271 <div class="tool-bar">
eads@18 272 <button>Rotate Left</button><button>Rotate Right</button>
eads@18 273 </div>
eads@18 274 <canvas id="c"></canvas>
eads@18 275 <img src="" alt="">
eads@18 276 </div>
eads@18 277 <script type="text/javascript">
eads@18 278 new ImageRotator(document.getElementById("image-rotator"),
eads@18 279 "ff.jpg", 608, 380);
eads@18 280 </script>
eads@18 281
eads@18 282 </body>
eads@18 283 </html>
eads@18 284