public override void DrawSegment(b2Vec2 p1, b2Vec2 p2, b2Color color)
 {
     DrawNode.AddLineVertex(p1.ToVectorC4B(color.ToCCColor4B(), PTMRatio));
     DrawNode.AddLineVertex(p2.ToVectorC4B(color.ToCCColor4B(), PTMRatio));
 }