Oh I wish i remembered trig stuff

[joran420]

I have this trajectory
bullet._t = ((_root.MainChar_mc._rotation+angleCorrection)*Mat h.PI)/180;
bullet._x += Math.cos(this._t)*15;
bullet._y += Math.sin(this._t)*15;

From this how can i tell weather the bullet is moving up on the stage down on the stage left right?

basically how can i get a function that if this bullet is moving straight up it returns 0 if its going directly to the right it returns 90
if its directly down 180 and dead left would be 270(relative to the stage)

im sure this one will be a piece of cake for dmonkey or one of you other sly math guys

[ozmic66]

a simple getAngle function should do it:

function getAngle(xDiff,yDiff){
	radians = Math.atan2(yDiff, xDiff);
	if (yDiff<0) {
		radians += (2*Math.PI);
	}
	degrees = radians/(Math.PI/180)-180;
	return degrees
}

i think that here 0 degrees means facing up, but you should check just to make sure

[joran420]

awesome thanks