/// <summary>
/// Checks to see if an animation is on screen. O(1) complexity, though not very efficient:
/// checks 9 points in and around the animation to see if any of them are on screen
/// </summary>
/// <param name="anim">The animation to check</param>
/// <returns>whether the animation is on screen</returns>
private bool checkOnScreen(Animation anim)
{
Vector2 bb = (anim.position - camera.getRefPoint()) * camera.getScale() + new Vector2(w / 2, h / 2);
if (!checkNearby(bb))
return false;
Vector2 aa = (anim.position - camera.getRefPoint() + new Vector2(anim.getWidth() / 2, anim.getHeight() / 2)) * camera.getScale() + new Vector2(w / 2, h / 2);
Vector2 ab = (anim.position - camera.getRefPoint() + new Vector2(0, anim.getHeight() / 2)) * camera.getScale() + new Vector2(w / 2, h / 2);
Vector2 ac = (anim.position - camera.getRefPoint() + new Vector2(-anim.getWidth() / 2, anim.getHeight())) * camera.getScale() + new Vector2(w / 2, h / 2);
Vector2 ba = (anim.position - camera.getRefPoint() + new Vector2(anim.getWidth() / 2, 0)) * camera.getScale() + new Vector2(w / 2, h / 2);
Vector2 bc = (anim.position - camera.getRefPoint() + new Vector2(-anim.getWidth() / 2, 0)) * camera.getScale() + new Vector2(w / 2, h / 2);
Vector2 ca = (anim.position - camera.getRefPoint() + new Vector2(anim.getWidth() / 2, -anim.getHeight() / 2)) * camera.getScale() + new Vector2(w / 2, h / 2);
Vector2 cb = (anim.position - camera.getRefPoint() + new Vector2(0, -anim.getHeight() / 2)) * camera.getScale() + new Vector2(w / 2, h / 2);
Vector2 cc = (anim.position - camera.getRefPoint() + new Vector2(-anim.getWidth() / 2, -anim.getHeight() / 2)) * camera.getScale() + new Vector2(w / 2, h / 2);
if (checkOnScreen(aa) || checkOnScreen(ab) || checkOnScreen(ac) ||
checkOnScreen(ba) || checkOnScreen(bb) || checkOnScreen(bc) ||
checkOnScreen(ca) || checkOnScreen(cb) || checkOnScreen(cc))
return true;
return false;
}
/// <summary>
/// Rudimentary collision detection between two animation
/// </summary>
/// <param name="other">The animation to check this one against</param>
/// <returns>whether the two animation hit</returns>
public bool checkHit(Animation other)
{
if (other == null) return false;
float top1 = position.Y - getHeight() / 2, top2 = other.position.Y - other.getHeight() / 2;
float bot1 = position.Y + getHeight() / 2, bot2 = other.position.Y + other.getHeight() / 2;
float l1 = position.X - getWidth() / 2, l2 = other.position.X - other.getWidth() / 2;
float r1 = position.X + getWidth() / 2, r2 = other.position.X + other.getWidth() / 2;
if (top1 < bot2 && bot1 > top2 && l1 < r2 && r1 > l2)
return true;
return false;
}