private PointF[] MakeStarPoints( double start_theta, int num_points, int Radius )
{
double theta, dtheta;
PointF[] result;
float cx = Radius;
float cy = Radius;
int skip = ( int )( ( num_points - 1 ) / 2.0 );
// If this is a polygon, don't bother with concave points.
if ( skip == 1 ) {
result = new PointF[num_points];
theta = start_theta;
dtheta = 2 * Math.PI / num_points;
for ( int i = 0; i < num_points; i++ ) {
result[i] = new PointF(
( float )( cx + cx * Math.Cos( theta ) ),
( float )( cy + cy * Math.Sin( theta ) ) );
theta += dtheta;
}
return result;
}
// Find the radius for the concave vertices.
double concave_radius = CalculateConcaveRadius( num_points, skip );
// Make the points.
result = new PointF[2 * num_points];
theta = start_theta;
dtheta = Math.PI / num_points;
for ( int i = 0; i < num_points; i++ ) {
result[2 * i] = new PointF(
( float )( cx + cx * Math.Cos( theta ) ),
( float )( cy + cy * Math.Sin( theta ) ) );
theta += dtheta;
result[2 * i + 1] = new PointF(
( float )( cx + cx * Math.Cos( theta ) * concave_radius ),
( float )( cy + cy * Math.Sin( theta ) * concave_radius ) );
theta += dtheta;
}
return result;
}
