public void SemiCircle(Vector2 center, float startRadians, float endRadians, float radius, int steps, Color color)
{
var last = Calc.AngleToVector(startRadians, radius);
for (int i = 1; i <= steps; i++)
{
var next = Calc.AngleToVector(Calc.AngleLerp(startRadians, endRadians, (i / (float)steps)), radius);
Triangle(center + last, center + next, center, color);
last = next;
}
}
public void HollowCircle(Vector2 center, float radius, float thickness, int steps, Color color)
{
var last = Calc.AngleToVector(0, radius);
for (int i = 1; i <= steps; i++)
{
var next = Calc.AngleToVector((i / (float)steps) * Calc.TAU, radius);
Line(center + last, center + next, thickness, color);
last = next;
}
}
/// <summary>
/// Normalizes a Vector2 and snaps it to the closest of the 8 cardinal or diagonal directions (a zero-length Vector2 returns 0)
/// </summary>
public static Vector2 EightWayNormal(this Vector2 vector)
{
if (vector == Vector2.Zero)
{
return(vector);
}
vector = Calc.AngleToVector(Calc.Snap(vector.Angle(), Calc.PI / 4));
if (MathF.Abs(vector.X) < .1f)
{
vector.X = 0;
vector.Y = MathF.Sign(vector.Y);
}
else if (MathF.Abs(vector.Y) < .1f)
{
vector.X = MathF.Sign(vector.X);
vector.Y = 0;
}
return(vector);
}