69 lines
2.0 KiB
JavaScript
69 lines
2.0 KiB
JavaScript
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jQuery.fn.rotate = function(angle,whence) {
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var p = this.get(0);
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// we store the angle inside the image tag for persistence
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if (!whence) {
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p.angle = ((p.angle==undefined?0:p.angle) + angle) % 360;
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} else {
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p.angle = angle;
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}
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if (p.angle >= 0) {
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var rotation = Math.PI * p.angle / 180;
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} else {
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var rotation = Math.PI * (360+p.angle) / 180;
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}
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var costheta = Math.cos(rotation);
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var sintheta = Math.sin(rotation);
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if (document.all && !window.opera) {
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var canvas = document.createElement('img');
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canvas.src = p.src;
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canvas.height = p.height;
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canvas.width = p.width;
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canvas.style.filter = "progid:DXImageTransform.Microsoft.Matrix(M11="+costheta+",M12="+(-sintheta)+",M21="+sintheta+",M22="+costheta+",SizingMethod='auto expand')";
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} else {
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var canvas = document.createElement('canvas');
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if (!p.oImage) {
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canvas.oImage = new Image();
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canvas.oImage.src = p.src;
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canvas.oImage.width = p.width;
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canvas.oImage.height = p.height;
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} else {
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canvas.oImage = p.oImage;
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}
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canvas.style.width = canvas.width = Math.abs(costheta*canvas.oImage.width) + Math.abs(sintheta*canvas.oImage.height);
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canvas.style.height = canvas.height = Math.abs(costheta*canvas.oImage.height) + Math.abs(sintheta*canvas.oImage.width);
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var context = canvas.getContext('2d');
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context.save();
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if (rotation <= Math.PI/2) {
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context.translate(sintheta*canvas.oImage.height,0);
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} else if (rotation <= Math.PI) {
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context.translate(canvas.width,-costheta*canvas.oImage.height);
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} else if (rotation <= 1.5*Math.PI) {
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context.translate(-costheta*canvas.oImage.width,canvas.height);
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} else {
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context.translate(0,-sintheta*canvas.oImage.width);
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}
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context.rotate(rotation);
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context.drawImage(canvas.oImage, 0, 0, canvas.oImage.width, canvas.oImage.height);
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context.restore();
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}
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canvas.id = p.id;
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canvas.angle = p.angle;
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p.parentNode.replaceChild(canvas, p);
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};
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jQuery.fn.rotateRight = function(angle) {
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this.rotate(angle==undefined?90:angle);
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};
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jQuery.fn.rotateLeft = function(angle) {
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this.rotate(angle==undefined?-90:-angle);
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};
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