Code-Bin #439

untitled ActionScript Code
Posted by: Gabor | December 26, 2009 @ 1:18pm

ActionScript Code

var G:Number = 100;

function calcAcceleration(dot0:MovieClip, dot1:MovieClip):Point
{
	var r:Point = new Point(dot1.x - dot0.x, dot1.y - dot0.y);
	/*if (r.length < 14.5)
		return new Point(0, 0);*/
	
	var rSqr:Number = Math.pow(r.length, 2);
	
	r.normalize(G * dot1.m / rSqr);
	
	return r;
}

function normalizePositionVelocity(dot:MovieClip):void
{
	/*if (dot.x > 550)
		dot.v.x = -Math.abs(dot.v.x);
	if (dot.x < 0)
		dot.v.x = Math.abs(dot.v.x);
	if (dot.y > 400)
		dot.v.y = -Math.abs(dot.v.y);
	if (dot.y < 0)
		dot.v.y = Math.abs(dot.v.y);*/
}

function calcKineticEnergy(dot:MovieClip):Number
{
	return dot.m * Math.pow(dot.v.length, 2) / 2;
}

function calcPotentialEnergy(dot0:MovieClip, dot1:MovieClip):Number
{
	var r:Point = new Point(dot1.x - dot0.x, dot1.y - dot0.y);
	return -G * dot0.m * dot1.m / r.length;
}

addEventListener(Event.ENTER_FRAME, enterFrame)
function enterFrame(event:Event):void
{
	dot0.v = dot0.v.add(calcAcceleration(dot0, dot1));
	dot0.v = dot0.v.add(calcAcceleration(dot0, dot2));
	dot0.v = dot0.v.add(calcAcceleration(dot0, dot3));
	normalizePositionVelocity(dot0);
	
	dot1.v = dot1.v.add(calcAcceleration(dot1, dot0));
	dot1.v = dot1.v.add(calcAcceleration(dot1, dot2));
	dot1.v = dot1.v.add(calcAcceleration(dot1, dot3));
	normalizePositionVelocity(dot1);
	
	dot2.v = dot2.v.add(calcAcceleration(dot2, dot0));
	dot2.v = dot2.v.add(calcAcceleration(dot2, dot1));
	dot2.v = dot2.v.add(calcAcceleration(dot2, dot3));
	normalizePositionVelocity(dot2);
	
	dot3.v = dot3.v.add(calcAcceleration(dot3, dot0));
	dot3.v = dot3.v.add(calcAcceleration(dot3, dot1));
	dot3.v = dot3.v.add(calcAcceleration(dot3, dot2));
	normalizePositionVelocity(dot3);
	
	dot0.x += dot0.v.x;
	dot0.y += dot0.v.y;
	
	dot1.x += dot1.v.x;
	dot1.y += dot1.v.y;
	
	dot2.x += dot2.v.x;
	dot2.y += dot2.v.y;
	
	dot3.x += dot3.v.x;
	dot3.y += dot3.v.y;
	
	empty.graphics.lineStyle(1, 0x333333);
	empty.graphics.lineTo(dot0.x, dot0.y);
	
	var kineticEnergy = calcKineticEnergy(dot0)
		+ calcKineticEnergy(dot1)
		+ calcKineticEnergy(dot2)
		+ calcKineticEnergy(dot3);
		
	var potentialEnergy = calcPotentialEnergy(dot0, dot1)
		+ calcPotentialEnergy(dot0, dot2)
		+ calcPotentialEnergy(dot0, dot3)
		+ calcPotentialEnergy(dot1, dot2)
		+ calcPotentialEnergy(dot1, dot3)
		+ calcPotentialEnergy(dot2, dot3);
	
	kinE.text = new String(kineticEnergy);
	potE.text = new String(potentialEnergy);
	
	e.text = new String(kineticEnergy + potentialEnergy);
}

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