.NET Compact Framework的二维图形引擎应用(3)

//Clear the background and reset the transform state
gx.Clear(Color.White);
gx.ResetTransform();
//Draw a rectangle and apply scale transform to it
Color c = Utils.FromArgb(0x80, Color.Orange);
PenX pen = new PenX(c, 7.5f);
pen.LineJoin = LineJoinX.Miter;
gx.DrawRectangle(pen, 10, 10, 50, 50);
gx.ScaleTransform(3, 3);
gx.DrawRectangle(pen, 10, 10, 50, 50);
//Draw a series of ellipses and rotate 10 degrees between 
   the preceding and the successor
c = Utils.FromArgb(0x80, Color.BlueViolet);
pen = new PenX(c, 5.5f);
gx.ScaleTransform(0.25F, 0.25F);
gx.RotateTransform(-40);
for (int j = 0; j < 10; j ++)
{
gx.RotateTransform(10);
gx.DrawEllipse(pen, 100, 50, 50, 130);
}
//Draw a series of triangles and apply translate transform to them
pen = new PenX(Utils.FromArgb(0x80, Color.Blue), 10);
Point p1 = new Point(120, 80);
Point p2 = new Point(100, 200);
Point p3 = new Point(140, 200);
Point[] points ={p1,p2,p3};
gx.Transform = new MatrixX();
pen.LineJoin = LineJoinX.Round;
for (int i = 0; i <= 40; i +=10)
{
gx.TranslateTransform(20, 10);
gx.DrawPolygon(pen, points);
}
//Refresh
Invalidate();