public override void Draw(ref Bitmap bitmap, PlotProperties plotprops)
{
double theta_degree = theta * 180 / Math.PI;
double SF = ImageUtil.CalculateScaleFactor(bitmap, plotprops);
int _b1 = (int)(b1 * SF);
int _t1 = (int)(t1 * SF);
int _b2 = (int)(b2 * SF);
int _t2 = (int)(t2 * SF);
int _r1 = (int)(r1 * SF);
int _r2 = (int)(r2 * SF);
int _h = (int)(h * SF);
int _tw = (int)(tw * SF);
int wdth = bitmap.Width;
int hght = bitmap.Height;
if (_r1 < 1)
{
_r1 = 1;
}
if (_r2 < 1)
{
_r2 = 1;
}
Graphics g = Graphics.FromImage(bitmap);
GraphicsPath path = new GraphicsPath();
path.AddLine(0, 0, 0, _h - _t2 - _r2);
path.AddArc(new System.Drawing.Rectangle(-_r2 * 2, _h - _t2 - _r2 * 2, _r2 * 2, _r2 * 2), 0, 90);
path.AddLine(-_r2, _h - _t2, -_b2 + _tw, _h - _t2);
path.AddLine(-_b2 + _tw, _h - _t2, -_b2 + _tw, _h);
path.AddLine(-_b2 + _tw, _h, _tw, _h);
path.AddLine(_tw, _h, _tw, _t1 + _r1);
path.AddArc(new System.Drawing.Rectangle(_tw, _t1, _r1 * 2, _r1 * 2), 180, 90);
path.AddLine(_tw + _r1, _t1, _b1, _t1);
path.AddLine(_b1, _t1, _b1, 0);
path.AddLine(_b1, 0, 0, 0);
path.CloseFigure();
PointF pnt = CreateImagePoint(SF);
Coordinate xy_min = ImageUtil.CalculateImageXYmin(bitmap, plotprops);
double Xdel = xp - xy_min.x;
double Ydel = yp - xy_min.y;
Matrix mtrx = ImageUtil.ImageTransformationMatrix(bitmap, pnt, theta_degree, Xdel, Ydel, SF, mirrorX, mirrorY);
path.Transform(mtrx);
Color _fillColor = Material.ConvertFillColor();
Pen _pen = new Pen(borderColor, borderThickness);
_pen.Alignment = PenAlignment.Inset;
g.FillPath(new SolidBrush(_fillColor), path);
g.DrawPath(_pen, path);
_pen.Dispose();
g.Dispose();
}