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