OpenEuphoria

Re: Win32 page flipping

• Posted by Pete Lomax <petelomax at blueyonder.co.uk> Jan 14, 2003
• 471 views

On Tue, 14 Jan 2003 14:00:43 +1100, Patrick.Barnes at transgrid.com.au
wrote:

>
>I have several pages of graphics and text (wPuts'ed) that I wish to =
switch between without flickering. How do I draw graphics and text into a=
 bitmap, so that I can blit it on to the screen in one go?

=46lickering? Do you use repaintWindow() alot? I found I reduced alot of
flicker with surrounding toolbars, buttons, border etc which did not
need updating by invoking my oppaint routine directly.

Otherwise: I assume you already have code which writes direct to the
window, so use something like this:

	size =3D getClientRect(win) -- returns {x1,y1,x2,y2}
	size[3]-=3Dsize[1]
	size[4]-=3Dsize[2]
	If Bitmap=3D0 then --[**1**]
		Bitmap=3Dcreate(Pixmap,"",0,0,0,size[3],size[4],0)
	end if
	setCtlSize(Bitmap,size[3],size[4])


then setFont/setPenColor/drawRectangle/drawLine/bitBlt/stretchBlt/
setTextColor/wPuts as usual, only to your Bitmap, then just:

	copyBlt(win, 0, 0, Bitmap)

Pete
 [**1**] I create my bitmap precisely once, maximum size since I open
the window maximised, and resized it before each repaint.