// Fireworks JavaScript Command
// Install by copying to Fireworks/Configuration/Commands/
// Aaron Beall 2007 - http://abeall.com
// Version 1.0

var dom = fw.getDocumentDOM();
var sel = [].concat(fw.selection);

var nod, angle, dist, dist, traj;
for(var p in sel){
	for(var c in sel[p].contours){
		for(var n=0; n<sel[p].contours[c].nodes.length; n++){
			nod = sel[p].contours[c].nodes[n];
			if(nod.isSelectedPoint || fw.activeTool!='Subselection'){
				// find pred angle and succ length
				angle = getAngle(nod,{x:nod.predX,y:nod.predY});
				dist = getDistance({x:nod.succX,y:nod.succY},nod);
				
				// adjust pred handle to same length as succ
				traj = getTrajectory(dist,angle);
				nod.predX = nod.x+traj.x;
				nod.predY = nod.y+traj.y;
				
				nod.isCurvePoint = true;
			}
		}
	}
}

// find the distance between two points
function getDistance(p1,p2){
	return Math.sqrt(((p1.x-p2.x)*(p1.x-p2.x))+((p1.y-p2.y)*(p1.y-p2.y)));
}

// get the angle in degrees between two points
function getAngle(p1,p2){
	return -Math.atan2((p1.x-p2.x), (p1.y-p2.y))/(Math.PI/180);
}

// given angle and distance, find x,y translation
function getTrajectory(distance,angle){
	var xS = distance*Math.sin(angle*(Math.PI/180));
	var yS = -distance*Math.cos(angle*(Math.PI/180));
	return {x:xS,y:yS};
}