var yVelocity = 0;
var YTERMINALVEL = 30;
var xVelocity = 0;
var XTERMINALVEL = 30;
var collisionPointX = 0;
var collisionPointY = 0;

onEnterFrame = function()
{
	//make a dummy ball
	tempBall = {};
	tempBall = this;
	tempBall.radius = (this._width / 2);

	tempBall = _root.freq_applyGravity(tempBall);
	collisionTests();
	_root.freq_move(tempBall);
}

function collisionTests()
{
	var i = 0;
	var lines = _root.collideLines;
	for(i=0;i<lines.length;i++)
	{
		
		var theLine = lines;
		frames = getFrames(theLine,tempBall);
		if((frames < 1)&&(frames > 0))
		{
			react(theLine);
		}
	}
}

function react(tempLine)
{
		var lineDecay = 0.5;
		tempLine.angle = Math.atan2(tempLine.m*1,1);
		var alpha = tempLine.angle;
		var cosAlpha = Math.cos(alpha);
		var sinAlpha = Math.sin(alpha);
		//get the x and y velocities of the ball
		var vyi = tempBall.yVelocity;
		var vxi = tempBall.xVelocity;
		//project the x and y velocities onto the line of action
		var vyip = vyi*cosAlpha-vxi*sinAlpha;
		//project the x and y velocities onto the line
		var vxip = vxi*cosAlpha+vyi*sinAlpha;
		//reverse the velocity along the line of action
		var vyfp = -vyip*lineDecay;
		var vxfp = vxip;
		//translate back to Flash's x and y axes
		var vyf = vyfp*cosAlpha+vxfp*sinAlpha;
		var vxf = vxfp*cosAlpha-vyfp*sinAlpha;
		//set the velocities of the ball based from the results
		tempBall.xVelocity = vxf;
		tempBall.yVelocity = vyf;
		tempBall.tempx = point._x+point.xVelocity;
		tempBall.tempy = point._y+point.yVelocity;
		moveToContactPoint();
}

//how long will it take to hit a line
function getFrames(tempLine, point) 
{
		//the y intercept of the ball trajectory
		var slope2 = point.yVelocity/point.xVelocity;
		if (slope2 == Number.POSITIVE_INFINITY) 
		{
			var slope2 = 1000000;
		} 
		else if (slope2 == Number.NEGATIVE_INFINITY) 
		{
			var slope2 = -1000000;
		}
		var b2 = point._y-slope2*point._x;
		
		//intersection point
		tempLine.angle = Math.atan2(tempLine.m*1,1);
		tempLine.slope = Math.tan(tempLine.angle);
		var x = (b2-tempLine.b)/(tempLine.slope-slope2);
		var y = tempLine.slope*x+tempLine.b;
		//the angle that the ball is moving
		var theta = Math.atan2(point.yVelocity, point.xVelocity);
		//the difference between the angle of the line and of the ball trajectory
		tempLine.angle = Math.atan2(tempLine.m*1,1);
		var gamma = theta-tempLine.angle;
		//modify x and y
		var sinGamma = Math.sin(gamma);
		var r = (point.radius)/sinGamma;
		//the ball's position at point of contact
		var x = x-r*Math.cos(theta);
		var y = y -r*Math.sin(theta);
		collisionPointX = x;
		collisionPointY = y;
		//Now find how long it will take to
		//get to the point of contact
		var dis = Math.sqrt((x-point._x)*(x-point._x)+(y-point._y)*(y-point._y));
		var vel = Math.sqrt(point.xVelocity*point.xVelocity+point.yVelocity*point.yVelocity);
		var frames = dis/vel;
		//now check to see if point of contact is on the line segment
		var slope2a = -1/tempLine.slope;
		var b2a = y-slope2a*x;
		//point of contact
		var xa = (tempLine.b-b2a)/(slope2a-tempLine.slope);
		var ya = slope2a*xa+b2a;
		if ((xa>tempLine.lowX && xa<tempLine.highX) || (xa<tempLine.lowX && xa>tempLine.highX) || ((ya>tempLine.lowY && ya<tempLine.highY) || (ya<tempLine.lowY && ya>tempLine.highY))) {
			//within segment boundaries
		} 
		else 
			//not within segment boundaries so set frames high
			var frames = 1000;
	return frames;
}

function moveToContactPoint()
{
	tempBall.x = collisionPointX;
	tempBall.y = collisionPointY;
}