52 lines
1.8 KiB
JavaScript
52 lines
1.8 KiB
JavaScript
// xEllipse, Copyright 2004,2005 Michael Foster (Cross-Browser.com)
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// Part of X, a Cross-Browser Javascript Library, Distributed under the terms of the GNU LGPL
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function xEllipse(e, xRadius, yRadius, radiusInc, totalTime, startAngle, stopAngle)
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{
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if (!(e=xGetElementById(e))) return;
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if (!e.timeout) e.timeout = 25;
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e.xA = xRadius;
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e.yA = yRadius;
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e.radiusInc = radiusInc;
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e.slideTime = totalTime;
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startAngle *= (Math.PI / 180);
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stopAngle *= (Math.PI / 180);
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var startTime = (startAngle * e.slideTime) / (stopAngle - startAngle);
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e.stopTime = e.slideTime + startTime;
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e.B = (stopAngle - startAngle) / e.slideTime;
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e.xD = xLeft(e) - Math.round(e.xA * Math.cos(e.B * startTime)); // center point
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e.yD = xTop(e) - Math.round(e.yA * Math.sin(e.B * startTime));
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e.xTarget = Math.round(e.xA * Math.cos(e.B * e.stopTime) + e.xD); // end point
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e.yTarget = Math.round(e.yA * Math.sin(e.B * e.stopTime) + e.yD);
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var d = new Date();
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e.C = d.getTime() - startTime;
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if (!e.moving) {e.stop=false; _xEllipse(e);}
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}
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function _xEllipse(e)
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{
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if (!(e=xGetElementById(e))) return;
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var now, t, newY, newX;
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now = new Date();
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t = now.getTime() - e.C;
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if (e.stop) { e.moving = false; }
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else if (t < e.stopTime) {
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setTimeout("_xEllipse('"+e.id+"')", e.timeout);
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if (e.radiusInc) {
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e.xA += e.radiusInc;
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e.yA += e.radiusInc;
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}
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newX = Math.round(e.xA * Math.cos(e.B * t) + e.xD);
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newY = Math.round(e.yA * Math.sin(e.B * t) + e.yD);
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xMoveTo(e, newX, newY);
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e.moving = true;
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}
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else {
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if (e.radiusInc) {
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e.xTarget = Math.round(e.xA * Math.cos(e.B * e.slideTime) + e.xD);
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e.yTarget = Math.round(e.yA * Math.sin(e.B * e.slideTime) + e.yD);
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}
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xMoveTo(e, e.xTarget, e.yTarget);
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e.moving = false;
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}
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}
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