/// <summary>
/// ConvexPoly2 constructor.
/// Assumes input points define a convex region.
/// </summary>
public ConvexPoly2( Vector2[] points )
{
Vector2 center = GameEngine2D.Base.Math._00;
Planes = new Plane2[ points.Length ];
for ( int n=points.Length,i=n-1,i_next=0; i_next < n; i=i_next++ )
{
Vector2 p1 = points[i];
Vector2 p2 = points[i_next];
Planes[i] = new Plane2( p1, -Math.Perp( p2 - p1 ).Normalize() );
center += p1;
}
center /= (float)points.Length;
float radius = 0.0f;
for ( int i = 0; i != points.Length; ++i )
radius = FMath.Max( radius, ( points[i] - center ).Length() );
m_sphere = new Sphere2( center, radius );
}
public void MakeRegular( uint num, float r )
{
Planes = new Plane2[ num ];
float a2 = Math.TwicePi * 0.5f / (float)num;
for ( uint i = 0; i != num; ++i )
{
float a = Math.TwicePi * (float)i / (float)num;
Vector2 p = Vector2.Rotation( a + a2 );
Vector2 n = Vector2.Rotation( a );
Planes[i] = new Plane2( p * r, n );
}
m_sphere = new Sphere2( GameEngine2D.Base.Math._00, r );
}
public void MakeBox( Bounds2 bounds )
{
Planes = new Plane2[ 4 ];
Planes[0] = new Plane2( bounds.Point00, -Math._10 );
Planes[1] = new Plane2( bounds.Point10, -Math._01 );
Planes[2] = new Plane2( bounds.Point11, Math._10 );
Planes[3] = new Plane2( bounds.Point01, Math._01 );
m_sphere = new Sphere2( bounds.Center, bounds.Size.Length() * 0.5f );
}
