public static CollisionInformation GetCollisionInformation(this MPolygon polygon)
{
Vector2[] transformedVertices = CalculateTransformedVertices(polygon);
LineSegment[] transformedLineSegments = CalculateTransformedLineSegments(polygon, transformedVertices);
return(new CollisionInformation(transformedVertices, transformedLineSegments));
}
private static Vector2[] CalculateTransformedVertices(MPolygon polygon)
{
Vector2[] result = new Vector2[polygon.ShapeData.TotalVertices];
for (int i = 0; i < polygon.ShapeData.TotalVertices; i++)
{
result[i] = Vector2.Transform(new Vector2(polygon.ShapeData.Vertices[i].X, polygon.ShapeData.Vertices[i].Y), polygon.Transform);
}
return(result);
}
private static LineSegment[] CalculateTransformedLineSegments(MPolygon polygon, Vector2[] transformedVertices)
{
int totalVertices = polygon.ShapeData.TotalVertices;
LineSegment[] result = new LineSegment[totalVertices];
result[0] = new LineSegment(transformedVertices[totalVertices - 1].X, transformedVertices[totalVertices - 1].Y, transformedVertices[0].X, transformedVertices[0].Y);
for (int i = 1; i < totalVertices; i++)
{
result[i] = new LineSegment(transformedVertices[i - 1].X, transformedVertices[i - 1].Y, transformedVertices[i].X, transformedVertices[i].Y);
}
return(result);
}