Clearing the Windows Device Context

What is the best way to clear the screen before redrawing if using a Windows Device Context as your drawing surface

Use the ClearScreen() fuction that is part of whatever API your using.

Can't you FillRect() or something like that?

If you are filling white or black you can use those flags in BitBlt as a quick fill. Otherwise, you can use this as a faster alternative to FillRect:

Code:

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void PaintRect(HDC hdc, RECT *rect, COLORREF colour)
{
  COLORREF oldcr = SetBkColor(hdc, colour);
  ExtTextOut(hdc, 0, 0, ETO_OPAQUE, rect, "", 0, 0);
  SetBkColor(hdc, oldcr);
}

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yea fillrect works thanks sand man

Quote:

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Originally Posted by loopshot

yea fillrect works thanks sand man

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Nice guess wasn't it? ;)

HA, here is one better than both of your suggestins

Code:

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BOOL FloodFill(
  HDC hdc,          // handle to DC
  int nXStart,      // starting x-coordinate
  int nYStart,      // starting y-coordinate
  COLORREF crFill  // fill color
);

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but thank you all for the help guys :D

FloodFill() is not better than FillRect().

FloodFill is more for filling areas with borders than it is for large areas. FillRect() simply creates a colored square the size of the rect specified. This is a much faster process. FloodFill() is a somewhat complex function and I wouldn't use it for what you want to do.

Thanks budda