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File Content: example3.html

<!DOCTYPE html>

<!--

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

-->

body {
  overflow: hidden;
  width: 100%;
  height: 100%;
  margin: 0;
}

#image-rotator {
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
}

#image-rotator .tool-bar {
  text-align: center;
}

.tool-bar button {
  margin: 0.5em 0.5em 0 0;
}

#image-rotator img,
#image-rotator canvas {
  position: absolute;
}

</style>
<script type="text/javascript">

function easeInEaseOut(t) {
  var t2 = t * t;
  return 3 * t2 - 2 * t * t2;
}

ImageRotator.prototype = {
  getLoaded: function () {
    return this.imageLoaded && this.windowLoaded;
  },
  setImage: function (src, w, h) {
    this.imageLoaded = false;
    this.image.src = src;
    this.imageWidth = w;
    this.imageHeight = h;
  },

layout: function () {
    var PI2 = Math.PI / 2;
    var h = this.element.clientHeight;
    var w = this.element.clientWidth;
    var th = this.toolBar.offsetHeight;
    h -= this.toolBar.offsetHeight;
    if (!this.ctx || !this.getLoaded()) {
      this.btnCw.disabled = true;
      this.btnCcw.disabled = true;
      this.canvas.style.display = "none";
      this.image.style.display = "block";
      var ratio = Math.min(w / this.imageWidth, h / this.imageHeight, 1);
      var imgW = this.imageWidth * ratio;
      var imgH = this.imageHeight * ratio;
      var y = th + (h - imgH) / 2;
      var x = (w - imgW) / 2;
      this.image.style.left = Math.round(x) + "px";
      this.image.style.top = Math.round(y) + "px";
      this.image.style.width = Math.round(imgW) + "px";
      this.image.style.height = Math.round(imgH) + "px";
    } else {
      this.btnCw.disabled = this.isAnimating_;
      this.btnCcw.disabled = this.isAnimating_;
      this.canvas.style.display = "block";
      this.image.style.display = "none";

this.canvas.style.left = 0 + "px";
      this.canvas.style.top = th + "px";
      this.canvas.style.width = w + "px";
      this.canvas.width = w;
      this.canvas.style.height = h + "px";
      this.canvas.height = h;

this.ctx.save();
      this.ctx.clearRect(0, 0, w, h);
      this.ctx.translate(w / 2, h / 2);
      this.ctx.rotate(this.rotation);
      // 0 -> 1, sin(0) = 0
      // PI / 2 -> H / W, sin(PI/2) = 1

// sin(PI/2) = 1 -> limit factor is w and imgH

var iw = this.imageWidth;
      var ih = this.imageHeight;
      var scale;
      if (iw <= w && iw <= h && ih <= h && ih <= w) {
        scale = 1;
      } else {
        var sinr = sawFunc(this.rotation);
        var cosr = sawFunc(this.rotation + PI2);
        var ratio1 = sinr * Math.min(w / ih, h / iw);
        var ratio2 = cosr * Math.min(w / iw, h / ih);
        var ratio = Math.min(1, ratio1 + ratio2);
        scale = ratio;
      }
      this.ctx.scale(scale, scale);
      this.ctx.translate(-iw / 2, -ih / 2);
      this.ctx.drawImage(this.image, 0, 0, iw, ih);
      this.ctx.restore();
    }
  },

rotation: 0,
  animationDuration: 500,

rotateCcw: function () {
    if (!this.isAnimating_) {
      this.startTime_ = (new Date).valueOf();
      this.currentAngle_ = this.rotation;
      this.deltaAngle_ = Math.PI / 2;
      this.isAnimating_ = true;
      this.animCounter_ = 0;
      this.rotate_();
    }
  },

rotateCw: function () {
    if (!this.isAnimating_) {
      this.startTime_ = (new Date).valueOf();
      this.currentAngle_ = this.rotation;
      this.deltaAngle_ = -Math.PI / 2;
      this.isAnimating_ = true;
      this.animCounter_ = 0;
      this.rotate_();
    }
  },

rotate_: function () {
    if (this.isAnimating_) {
      var t = easeInEaseOut(Math.min(1, (new Date - this.startTime_) /
                            this.animationDuration));
      this.rotation = t * this.deltaAngle_ + this.currentAngle_;
      if (t < 1) {
        var self = this;
        window.setTimeout(function () {
          self.rotate_();
        }, 10);
      } else {
        this.isAnimating_ = false;
      }
      this.layout();
    }
  },

onImageLoad: function (e) {
    this.imageLoaded = true;
    this.initCanvas();
  },
  onImageError: function (e) {
    this.imageLoaded = false;
  },
  onImageAbort: function (e) {
    this.imageLoaded = false;
  },
  onWindowLoad: function (e) {
    this.windowLoaded = true;
    this.initCanvas();
  },

initCanvas: function () {
    if (!this.ctx && this.getLoaded()) {
      // IE recreates the element?
      this.canvas = this.element.getElementsByTagName("canvas")[0];
      this.ctx = this.canvas.getContext("2d");

if (!this.ctx) {
        return;
      }
      this.layout();
    }
  }
};

</script>
</head>
<body>

<div id="image-rotator">
  <div class="tool-bar">
    <button>Rotate Left</button><button>Rotate Right</button>
  </div>
  <canvas id="c"></canvas>
  <img src="" alt="">
</div>
<script type="text/javascript">
  new ImageRotator(document.getElementById("image-rotator"),
                   "ff.jpg", 608, 380);
</script>

</body>
</html>

Name	Size	Permission
testcases	---	0755
example1.html	2280 bytes	0644
example2.html	12507 bytes	0644
example3.html	7040 bytes	0644
ff.jpg	25286 bytes	0644