Remove Lines at runtime

Jaya J 1845 28 Apr 2015

I.m drawing number of lines at runtime in windows form application using Pen.Now I want to remove some of the lines by clicking MouseRight button at runtime.Is it possible?.If possible then tell me the code using c#.Please help me anyone.

Thanks.

Ask by Jaya J

Updated 29 Apr 2015

1 Answers

Manoj Pandey 29 Apr 2015

The Graphics.Draw... functions replace the pixels. There is no way to undo that unless you either

1. store the pixels that are being changed so you can reverse the drawing or

2. draw the pixels on a copy of the desktop so you can revert to the actual desktop or

3. overlay the desktop with a transparent surface and draw on that and remove the surface when it is no longer needed.

You can use Invalidate(); method for reset your lines

private void button1_MouseDown(object sender, MouseEventArgs e)
    {
        if (e.Button == MouseButtons.Left)
        {
      
        }
        if (e.Button == MouseButtons.Right)
        {
                this.Invalidate();
        }
    }

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Remove Lines at runtime

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