koobas.hobune.stream
Problem with angles and rotations in a 2D top down space shooter
Hello everyone. I'd like to start by saying that im very new to both unity and c#, so my question might be really really dumb. Im also pretty awful at math so that doesnt help with the "angle problem" I got.
Basically, Im trying to make a enemy turret slowly rotate towards the player. Since I want the rotation to be slow, Im using transform.Rotate instead of transform.rotation, as I dont know a way to make the second one be slow and not instant.
My logic is: I calculate the angle between the player ship and the enemy turret, and then I transform.Rotate the turret accordingly till the 2 angles are the same , so the turret is aiming at the player. Here's how I get the angle between the player ship and the player :
float AngleBetweenPoints(Vector2 a, Vector2 b)
{
return Mathf.Atan2(a.y - b.y, a.x - b.x) * Mathf.Rad2Deg;
}
this returns a float that goes from 180 to -180. now, the issue starts here. in my script to rotate the turret, I check the "transform.eulerAngles.z ", that would work but the turret angle goes from 0 to 360, while the AngleBetweenPoints goes from 180 to -180 as I said. so when I use this script (attached to the turret) it works aslong and the AngleBetweenPoints is POSITIVE, but it goes bananas when the AngleBetweenPoints is negative...
void RotateTurret() {
if (transform.eulerAngles.z < (angle ))
{
transform.Rotate(0, 0, 75 * (Time.deltaTime ));
}
if (transform.eulerAngles.z > (angle))
{
transform.Rotate(0, 0, -75 * (Time.deltaTime ));
}
}
as you can see i check the transform.eulerAngles.z of the turret and i compare it with the angle ( that is the angle between the ship and the turret) and then I use transform.Rotate and multiply by time.deltaTime to slow down the rotation.
As I said, it works till the angle is positive, but when it goes from 0 to -180 it fucks up the script. Ideally, I'd want to either convert the angle between points to a float that goes from 0 to 360, or convert the turret angle to a float that goes from 180 to -180. as I already said Im pretty crap at math, and even if I worked on this most of the night and morning I cannot find a way out. if you have any solution regarding the angle problem, or know any simpler way to accommplish what Im trying to do, please help me, Im miserable.
