ys.hu

p2p=function(a,b){
var x=a._x-b._x
var y=a._y-b._y
return Math.sqrt(x*x+y*y)
}

p2l=function(a,b,c){
var bax=b._x-a._x
var bay=b._y-a._y
var cay=c._y-a._y
var cax=c._x-a._x

a.clear()
a.lineStyle(0,0x769DB5,20)
a.moveTo(0,0)
a.lineTo(bax,bay)

var q=(cax*bax+cay*bay)/(bax*bax+bay*bay)
if (q<0){q=0} else if (q>1) q=1
return p2p(c,{_x:((1-q)*a._x+q*b._x),_y:((1-q)*a._y+q*b._y)})
}

_root.onEnterFrame=function(){out=p2l(a,b,c)}

setDrag=function(d){
d.onPress=function(){
this.onMouseMove=function() {
this._x=_xmouse
this._y=_ymouse
updateAfterEvent()
_root.onEnterFrame()
}
}
d.onRelease=this.onReleaseOutside=function(){delete this.onMouseMove}
}

setDrag(a)
setDrag(b)
setDrag(c)