Question

In my code, let’s say I have the PaintObject(Graphics g). In some other function, I want to call the PaintObject function to draw something at an offset, instead of drawing it at (0,0).

I know that in Java, I could use the Graphics.create(x, y, width, height) function to create a copy of my graphics object which I could use, which would draw within those bounds of the original graphics. Is there a way to do something similarly in C#?

Just to give you an example of what my code could look like:

class MyClass : UserControl {
  void PaintObject(Graphics g) {
    // Example: draw 10x10 rectangle
    g.DrawRectangle(new Pen(Color.Black), 0, 0, 10, 10);
  }

  protected override void OnPaint(PaintEventArgs e) {
    Graphics g = e.Graphics;
    // TODO: Paint object from PaintObject() at offset (50, 50)
  }
}

Answer 1

Set a transformation on the Graphics object:

protected override void OnPaint(PaintEventArgs e) 
{
    Graphics g = e.Graphics;

    Matrix transformation = new Matrix();
    transformation.Translate(50, 50);

    g.Transform = transformation;
}

or

protected override void OnPaint(PaintEventArgs e) 
{
    Graphics g = e.Graphics;
    g.TranslateTransform(50, 50);
}