public static Polygon2f FromCapsule(Vector2f center, float radius, float length, int segments)
{
int num = segments + 1;
Polygon2f polygon = new Polygon2f(num * 2);
float pi = (float)Math.PI;
float fseg = segments;
float half = length * 0.5f;
for (int i = 0; i < num; i++)
{
float theta = pi * i / fseg;
float x = radius * (float)Math.Cos(theta);
float y = radius * (float)Math.Sin(theta);
polygon.Positions[i] = center + new Vector2f(x, y + half);
}
for (int i = 0; i < num; i++)
{
float theta = pi * i / fseg + pi;
float x = radius * (float)Math.Cos(theta);
float y = radius * (float)Math.Sin(theta);
polygon.Positions[i + num] = center + new Vector2f(x, y - half);
}
polygon.CalculatePolygon();
polygon.MakeCCW();
return(polygon);
}
public static Polygon2f FromTriangle(Vector2f A, Vector2f B, Vector2f C)
{
Polygon2f polygon = new Polygon2f(3);
polygon.Positions[0] = A;
polygon.Positions[1] = B;
polygon.Positions[2] = C;
polygon.CalculatePolygon();
polygon.MakeCCW();
return(polygon);
}
public static Polygon2f FromBox(Vector2f min, Vector2f max)
{
Polygon2f polygon = new Polygon2f(4);
polygon.Positions[0] = min;
polygon.Positions[1] = new Vector2f(max.x, min.y);
polygon.Positions[2] = max;
polygon.Positions[3] = new Vector2f(min.x, max.y);
polygon.CalculatePolygon();
polygon.MakeCCW();
return(polygon);
}
public static Polygon2f FromStar4(Vector2f center, float scale)
{
Polygon2f polygon = new Polygon2f(8);
polygon.Positions[0] = new Vector2f(0, -1) * scale;
polygon.Positions[1] = new Vector2f(0.2f, -0.2f) * scale;
polygon.Positions[2] = new Vector2f(1, 0) * scale;
polygon.Positions[3] = new Vector2f(0.2f, 0.2f) * scale;
polygon.Positions[4] = new Vector2f(0, 1) * scale;
polygon.Positions[5] = new Vector2f(-0.2f, 0.2f) * scale;
polygon.Positions[6] = new Vector2f(-1, 0) * scale;
polygon.Positions[7] = new Vector2f(-0.2f, -0.2f) * scale;
polygon.CalculatePolygon();
polygon.MakeCCW();
return(polygon);
}
public static Polygon2f FromCircle(Vector2f center, float radius, int segments)
{
Polygon2f polygon = new Polygon2f(segments);
float pi = (float)Math.PI;
float fseg = segments;
for (int i = 0; i < segments; i++)
{
float theta = 2.0f * pi * i / fseg;
float x = radius * (float)Math.Cos(theta);
float y = radius * (float)Math.Sin(theta);
polygon.Positions[i] = center + new Vector2f(x, y);
}
polygon.CalculatePolygon();
polygon.MakeCCW();
return(polygon);
}
