Which angle?

So what must I do?

Math.toDegrees(Math.atan( (x2-x1) / (y2-y1) ));


but I''ll probably do instead

Math.toDegrees(Math.atan2(y2-y1, x2-x1));

I''ve got a 3D model. When I click on the screen I want the model to turn and face the direction that I clicked. I therefore have to get the angle.

Use this method to get the angle in degrees between two points. Result will be between 0 and 360, or -1 if the points are the same.

distance.X = target.X - you.X
distance.Y = target.Y - you.Y


/* Returns the angle between two points given
* the X and Y distance between those two points.
* Returns -1 if the two points are at the same
* coordinates.
*/
public static double atanfull(double x, double y)
{
if (x == 0 && y == 0)
return -1;

double angle;

angle = 90 - Math.toDegrees(Math.atan(y/x));

if (x == 0)
if (y < 0)
angle = 180;
else
angle = 0;

if (x < 0)
angle += 180;

return angle;
}

[edited by - Phaelax on March 2, 2004 9:59:59 PM]