
<!--
	//dw_glide.js - requires dw_lib.js
	// acc is number between -1 and 1 ( -1 full decelerated, 1 full accelerated, 0 linear, i.e. no acceleration)
	dynObj.prototype.slideTo = function (destX,destY,slideDur,acc,endFn) {
	  if (!document.getElementById) return;
	  this.slideDur = slideDur || .0001; var acc = -acc || 0;
	  if (endFn) this.onSlideEnd = endFn;
	  // hold destination values (check for movement on 1 axis only)
		if (destX == null) this.destX = this.x;	else this.destX = destX;
	  if (destY == null) this.destY = this.y; else this.destY = destY;
	  this.startX = this.x; this.startY = this.y;
		this.st = new Date().getTime();
		// control points for bezier-controlled slide (see www.youngpup.net accelimation)
	  this.xc1 = this.x + ( (1+acc) * (this.destX-this.x)/3 );
		this.xc2 = this.x + ( (2+acc) * (this.destX-this.x)/3 );
	  this.yc1 = this.y + ( (1+acc) * (this.destY-this.y)/3 );
		this.yc2 = this.y + ( (2+acc) * (this.destY-this.y)/3 );
		this.sliding = true;
	  this.onSlideStart();
	  dw_Animation.add(this.animString + ".doSlide()");
	}

	dynObj.prototype.doSlide = function() {
		if (!this.sliding) return;
		var elapsed = new Date().getTime() - this.st;
		if (elapsed < this.slideDur) {
		var x = dw_Bezier.getValue(elapsed/this.slideDur, this.startX, this.destX, this.xc1, this.xc2);
		var y = dw_Bezier.getValue(elapsed/this.slideDur, this.startY, this.destY, this.yc1, this.yc2);
			this.shiftTo( Math.round(x) ,Math.round(y) );
			this.onSlide();
		} else {	// if time is up
		dw_Animation.remove(this.animString + ".doSlide()");
			this.shiftTo(this.destX,this.destY);
			this.onSlide();
			this.sliding = false;
			this.onSlideEnd();
		}
	}

	dynObj.prototype.slideBy = function(dx,dy,slideDur,acc,endFn) {
		var destX=this.x+dx; var destY=this.y+dy;
		this.slideTo(destX,destY,slideDur,acc,endFn);
	}

	dynObj.prototype.onSlideStart = function () {}
	dynObj.prototype.onSlide = function () {}
	dynObj.prototype.onSlideEnd = function () { if (this.el) this.el = null; }
//-->