// draw the material.
static public void DrawMat(MatEx mat, GlViewPortEx viewPort)
{
viewPort.SetDrawColor(Color.White);
viewPort.SetLineWidth(1);
if (mat.GetMatType() == MAT_TYPE_EX.MAT_EX_RECT)
{
RectMatEx rectMat = (RectMatEx)mat;
Rect2DEx rect2D = rectMat.GetBoundaryRect();
Polygon2DEx poly = new Polygon2DEx();
poly.AddPoint(new Point2DEx(rect2D.GetXMin(), rect2D.GetYMin()));
poly.AddPoint(new Point2DEx(rect2D.GetXMax(), rect2D.GetYMin()));
poly.AddPoint(new Point2DEx(rect2D.GetXMax(), rect2D.GetYMax()));
poly.AddPoint(new Point2DEx(rect2D.GetXMin(), rect2D.GetYMax()));
viewPort.DrawPolygon(poly);
}
else if (mat.GetMatType() == MAT_TYPE_EX.MAT_EX_POLY)
{
PolyMatEx polyMat = (PolyMatEx)mat;
Polygon2DEx poly = polyMat.GetMatPolygon();
viewPort.DrawPolygon(poly);
// draw the useless holes.
Poly2DListEx uselessHoles = polyMat.GetUselessHoleList();
for (int i = 0; i < uselessHoles.Size(); i++)
{
viewPort.DrawPolygon(uselessHoles.GetPolygonByIndex(i));
}
}
}