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repainted if the window is minimized and restored. The potential drawback is that the code becomes significantly more tangled, especially if the drawing logic is complicated. To avoid writing the same code twice, you should separate the drawing logic into a separate subroutine that accepts a Graphics object and the item to draw. The following code snippet shows how this technique would work with the simple square painting program. // Paint a square in response to a mouse click. private void DrawSquare_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) { Rectangle square = new Rectangle(e.X, e.Y, 20, 20); squares.Add(square); Graphics g = this.CreateGraphics(); DrawRectangle(square, g); g.Dispose(); } // Paint all the squares when the form needs to be refreshed // in response to the Paint event. private void DrawSquare_Paint(object sender, System.Windows.Forms.PaintEventArgs e) { foreach (Rectangle square in squares) { DrawRectangle(square, e.Graphics); } } // This procedure performs the actual drawing, and is called by // DrawSquare_MouseDown and DrawSquare_Paint. private void DrawRectangle(Rectangle rect, Graphics g) { Pen pen = new Pen(Color.Red, 10); g.DrawRectangle(drawingPen, rect); pen.Dispose(); lblCount.Text = " " + squares.Count.ToString() + " squares"; } A simpler solution is to use one of the overloaded versions on the Invalidate() method. This instructs Windows to repaint only a small portion of the window. The full painting code still runs (which could slow your application if the painting is complex), but only the specified region is repainted, thereby improving performance and drastically reducing screen flicker.

Debugging drawing code can be frustrating. For example, consider what happens if you set a breakpoint in the painting code for a form. When the breakpoint is reached, the code enters break mode, the IDE appears, and the application window is hidden. When you run the next line of code, the program is redisplayed, which triggers a second Paint event. To escape this endless sequence of repainting, you can use a couple of tricks: If you have a high-resolution monitor, you can run your application alongside the program you are testing. Then, when your program enters break mode, the IDE window does not appear on top of your program window, and a repaint is not triggered. (Alternatively, you can use two monitors at once.) Alternatively, you can set the TopMost property of your form to True, which keeps it superimposed on your IDE window at all times. This should also avoid a repaint.

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private void DrawSquare_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e) { Rectangle square = new Rectangle(e.X, e.Y, 20, 20); squares.Add(square); // Get a region that includes the square and its border. // Because the pen width is 10 pixels (and the center line is in // the middle), you'll need an extra 5 pixels on each side. square.Inflate(5, 5); Invalidate(square); } Finally, the last enhancement you can make is to modify the painting code to perform the repainting only if it falls in the invalidated region. You can determine the invalidated region by checking the PaintEventArgs.ClipRectangle property. For example, you could use conditional logic that paints the rectangle only if it falls into this region. In this situation, there isn t much performance benefit to be had because the step of painting the rectangle doesn t take much time (and the output isn t copied to the drawing surface anyway). However, if you need to perform a computationally intensive drawing task (for example, one that involves a gradient or a series of coordinate calculations), you can use this approach to avoid the work when it s not necessary.

You may notice that when you repaint a window frequently it flickers madly The flicker is caused because, with each paint event, the image is erased and then redrawn object by object The flash you see is the blank background that precedes the redrawn content You can reduce flickering by preventing a control or form from drawing its background If you do, your code must begin by painting a background using one of the fill methods from the Graphics class Otherwise, the original content remains underneath the new content To disable background painting, all you need to do is override the OnPaintBackground() method for the form or control and do nothing In other words, you won t call the base OnPaintBackground() method Protected Overrides Sub OnPaintBackground( _ ByVal e As SystemWindowsFormsPaintEventArgs) ' Do nothing.

Note Another way to paint just a portion of a window is to develop owner-drawn controls that override their own OnPaint() methods. In 24, you ll see an example of a custom drawing program that demonstrates both the control-based approach and a pure GDI+ approach to drawing shape elements.

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