fscommand("fullscreen", "false");
fscommand("allowscale", "false");
fscommand("showmenu", "false");
//create game object
//dragging is true when the point is being dragged
game = {dragging:false};
//create first vector
//point p0 is its starting point in the coordinates x/y
//point p1 is its end point in the coordinates x/y
game.v1 = {p0:{x:150, y:50}, p1:{x:150, y:100}};
//create second vector
//point p0 is its starting point in the coordinates x/y
//point p1 is its end point in the coordinates x/y
game.v2 = {p0:{x:100, y:150}, p1:{x:200, y:150}};
//function to draw the points, lines and show text
//this is only needed for the example to illustrate
function drawAll(v)
{
	_root.p0._x = v.p0.x;
	_root.p0._y = v.p0.y;
	_root.p1._x = v.p1.x;
	_root.p1._y = v.p1.y;
	_root.p2._x = game.v2.p0.x;
	_root.p2._y = game.v2.p0.y;
	_root.p3._x = game.v2.p1.x;
	_root.p3._y = game.v2.p1.y;
	_root.p4._x = game.ip.x;
	_root.p4._y = game.ip.y;
	_root.dragger0._x = v.p0.x;
	_root.dragger0._y = v.p0.y;
	_root.dragger1._x = v.p1.x;
	_root.dragger1._y = v.p1.y;
	_root.dragger2._x = game.v2.p0.x;
	_root.dragger2._y = game.v2.p0.y;
	_root.dragger3._x = game.v2.p1.x;
	_root.dragger3._y = game.v2.p1.y;
	_root.v1._x = v.p0.x;
	_root.v1._y = v.p0.y;
	_root.v2._x = game.v2.p0.x;
	_root.v2._y = game.v2.p0.y;
	_root.v3._x = v.p0.x;
	_root.v3._y = v.p0.y;
	_root.v1._xscale = v.vx;
	_root.v1._yscale = v.vy;
	_root.v2._xscale = game.v2.vx;
	_root.v2._yscale = game.v2.vy;
	_root.v3._xscale = game.v3.vx;
	_root.v3._yscale = game.v3.vy;
	_root.arrow1._x = v.p1.x;
	_root.arrow1._y = v.p1.y;
	_root.arrow1._rotation = 180/Math.PI*Math.atan2(v.vy, v.vx);
	_root.arrow2._x = game.v2.p1.x;
	_root.arrow2._y = game.v2.p1.y;
	_root.arrow2._rotation = 180/Math.PI*Math.atan2(game.v2.vy, game.v2.vx);
	_root.arrow3._x = game.v3.p1.x;
	_root.arrow3._y = game.v3.p1.y;
	_root.arrow3._rotation = 180/Math.PI*Math.atan2(game.v3.vy, game.v3.vx);
}
//main function
function runMe()
{
	//check if point is dragged
	if (game.dragging)
	{
		var v = game.v1;
		var x = Math.round(_root.dragger0._x);
		var y = Math.round(_root.dragger0._y);
		v.p0.x = x;
		v.p0.y = y;
		//get the coordinates from dargged mcs
		var x = Math.round(_root.dragger1._x);
		var y = Math.round(_root.dragger1._y);
		v.p1.x = x;
		v.p1.y = y;
		updateVector(v);
		var v = game.v2;
		var x = Math.round(_root.dragger2._x);
		var y = Math.round(_root.dragger2._y);
		v.p0.x = x;
		v.p0.y = y;
		var x = Math.round(_root.dragger3._x);
		var y = Math.round(_root.dragger3._y);
		v.p1.x = x;
		v.p1.y = y;
		updateVector(v);
		game.v3 = {};
		var v = game.v3;
		v.p0 = game.v1.p0;
		v.p1 = game.v2.p0;
		updateVector(v);
		findIntersection(game.v1, game.v2);
		drawAll(game.v1);
	}
}
//function to find all parameters for the vector
function updateVector(v)
{
	//x and y components
	//end point coordinate - start point coordinate
	v.vx = v.p1.x-v.p0.x;
	v.vy = v.p1.y-v.p0.y;
	//length of vector
	v.len = Math.sqrt(v.vx*v.vx+v.vy*v.vy);
	//normalized unti-sized components
	v.dx = v.vx/v.len;
	v.dy = v.vy/v.len;
	//right hand normal
	//v.rx = -v.vy;
	//v.ry = v.vx;
	//left hand normal
	//v.lx = v.vy;
	//v.ly = -v.vx;
}
//find intersection point of 2 vectors
function findIntersection(v1, v2)
{
	//vector between starting points
	var v3 = {vx:v2.p0.x-v1.p0.x, vy:v2.p0.y-v1.p0.y};
	//if they are parallel vectors, return big number
	if ((v1.dx == v2.dx and v1.dy == v2.dy) or (v1.dx == -v2.dx and v1.dy == -v2.dy))
	{
		var t = 1000000;
	}
	else
	{
		var t = perP(v3, v2)/perP(v1, v2);
	}
	//intersection point
	game.ip = {};
	game.ip.x = v1.p0.x+v1.vx*t;
	game.ip.y = v1.p0.y+v1.vy*t;
}
//calculate perp product of 2 vectors
function perP(va, vb)
{
	var pp = va.vx*vb.vy-va.vy*vb.vx;
	return pp;
}
//calculate all parameters for the vectors
updateVector(game.v1);
updateVector(game.v2);
game.v3 = {};
game.v3.p0 = game.v1.p0;
game.v3.p1 = game.v2.p0;
updateVector(game.v3);
findIntersection(game.v1, game.v2);
drawAll(game.v1);