Removing lines drawn on a dialog window

[bilbobaggio]

Hi,

In my MFC app I have a button which when clicked draws a few lines in the dialog window. If the button is re-clicked i need the previously drawn lines to be erased before drawing new ones. How do I accomplish this?

Thanks

 

[HyperEngineer]

One way would be to redraw the previous lines in the background color. This effectively erases them. Then change your brush to the new color and draw your next set of lines.

HyperEngineer
If it ain't broke, it probably needs improvement.