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82 lines
2.1 KiB
JavaScript
82 lines
2.1 KiB
JavaScript
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/*
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DynAPI Distribution
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Glide Animation Extension
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The DynAPI Distribution is distributed under the terms of the GNU LGPL license.
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requires: dynapi.fx.Thread
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*/
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function GlideAnimation(x1,y1,x2,y2,angleinc,startSpeed,endSpeed) {
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if (x2==null) x2 = x1;
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if (y2==null) y2 = y1;
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var normAngle = dynapi.functions.getNormalizedAngle(x1,y1,x2,y2);
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var distx = x2-x1;
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var disty = y2-y1;
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var distance = Math.sqrt(Math.pow(distx,2) + Math.pow(disty,2));
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angleinc = (angleinc==null)? 7 : Math.abs(angleinc);
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// a terrible mess but it works
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var r = 1;
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if (startSpeed == "fast") {
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var centerX = x1;
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var centerY = y1;
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var centerX2 = x2;
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var centerY2 = y2;
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startAngle = 0;
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endAngle = 90;
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if (endSpeed=="fast") distance = distance/2;
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}
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else {
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startAngle = -90;
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endAngle = 0;
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if (endSpeed == "fast") {
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var centerX = x1+distx;
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var centerY = y1+disty;
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}
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else { // default slow,slow
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var centerX2 = x2-distx/2;
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var centerY2 = y2-disty/2;
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distance = distance/2;
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var centerX = x1+distx/2;
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var centerY = y1+disty/2;
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r = -1;
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}
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}
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var i,d,x,y,dx,dy,path=[];
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for (var a=startAngle; a<endAngle; a+=angleinc) {
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i = path.length;
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d = distance*Math.sin(a*Math.PI/180);
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path[i] = Math.round(centerX + d*Math.cos(normAngle));
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path[i+1] = Math.round(centerY - d*Math.sin(normAngle));
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}
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if (startSpeed==endSpeed) {
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for (var a=endAngle; a<endAngle+90; a+=angleinc) {
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i = path.length;
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d = distance*Math.sin(a*Math.PI/180);
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path[i] = Math.round(centerX2 - r*d*Math.cos(normAngle));
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path[i+1] = Math.round(centerY2 + r*d*Math.sin(normAngle));
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}
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}
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var l = path.length;
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if (path[l-2] != x2 || path[l-1]!=y2) {
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path[l] = x2;
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path[l+1] = y2;
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}
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return path;
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};
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DynLayer.prototype.glideStop = function () {
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if (this._thread) this._thread.stop();
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};
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DynLayer.prototype.glideTo = function(x2,y2,angleinc,ms,startSpeed,endSpeed) {
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if (this.x!=x2 || this.y!=y2) {
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if (!this._thread) this._thread = new Thread(this);
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if (ms) this._thread.interval = ms;
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this._thread.play(GlideAnimation(this.x,this.y,x2,y2,angleinc,startSpeed,endSpeed) );
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}
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};
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