void Prepare()
{
cx = w / 2;
cy = h / 2;
//clear background
drawer.Clear(Colors.White);
//draw a black rectangle in center
Fill fill = Fills.Gray;
int size = 15;
drawer.DrawRectangle(fill, cx - size, cy - size, size * 2, size * 2);
}
private void btnPushPop_Click(object sender, EventArgs e)
{
//original view
drawer = new Drawer(buffer);
Prepare();
Fill fill = Fills.Red;
fill.Opacity = 0.2;
drawer.DrawRectangle(fill, 50, 0, 150, 50);
drawer.PushMatrix();
drawer.Rotate(20);
drawer.DrawRectangle(fill, 50, 0, 150, 50);
drawer.PushMatrix();
drawer.Rotate(30);
drawer.DrawRectangle(fill, 50, 0, 150, 50);
//revert transformations
fill = Fills.Blue;
fill.Opacity = 0.2;
drawer.DrawRectangle(fill, 50, 0, 50, 20);
drawer.PopMatrix();
drawer.DrawRectangle(fill, 50, 0, 50, 20);
drawer.PopMatrix();
drawer.DrawRectangle(fill, 50, 0, 50, 20);
DisplayOriginal(buffer);
//discard after view 1, 2, 3
DisplayAfter1(null);
DisplayAfter2(null);
DisplayAfter3(null);
txtDesc1.Text = "";
txtDesc2.Text = "";
txtDesc3.Text = "";
}
public override void Draw(IDrawer drawer)
{
drawer.DrawRectangle(4, 5);
}
public void Draw(IDrawer drawer)
{
drawer.DrawRectangle(this);
}
private void btnPushPop_Click(object sender, EventArgs e)
{
//original view
drawer = new Drawer(buffer);
Prepare();
Fill fill = Fills.Red;
fill.Opacity = 0.2;
drawer.DrawRectangle(fill, 50, 0, 150, 50);
drawer.PushMatrix();
drawer.Rotate(20);
drawer.DrawRectangle(fill, 50, 0, 150, 50);
drawer.PushMatrix();
drawer.Rotate(30);
drawer.DrawRectangle(fill, 50, 0, 150, 50);
//revert transformations
fill = Fills.Blue;
fill.Opacity = 0.2;
drawer.DrawRectangle(fill, 50, 0, 50, 20);
drawer.PopMatrix();
drawer.DrawRectangle(fill, 50, 0, 50, 20);
drawer.PopMatrix();
drawer.DrawRectangle(fill, 50, 0, 50, 20);
DisplayOriginal(buffer);
//discard after view 1, 2, 3
DisplayAfter1(null);
DisplayAfter2(null);
DisplayAfter3(null);
txtDesc1.Text = "";
txtDesc2.Text = "";
txtDesc3.Text = "";
}