Uncommon Knowledge - WC_Vprev%
Published By | Date | Version | Knowledge Level | Keywords |
---|---|---|---|---|
Sprezzatura Ltd | 01 APR 1992 | 2.11+ | EXPERT | WINDOW_COMMON%, WC_VPREV%, VSPACE, VIDEO.RW |
The Vspace image for the screen as it was before the window was invoked. Note that although this is nearly identical to a Video.Rw image variable it cannot be used without some pre-processing as each VSPACE image contains a 25 byte header block.
If it is desired to redisplay the background using the VPrev variable one would use a section of code similar to the following.
Subroutine Display_VPrev $Insert Include, Window_Common% Declare Function Video.Rw CrtW = Seq(WC_VPrev%[3,1] - 1 CrtH = Seq(WC_VPrev%[5,1]) - 1 Img = WC_Prev%[26,10000] OK = Video.Rw(0, 0, CrtW, CrtH, "W", Img) Return
(Volume 3, Issue 10, Page 14)