On Mon, 02 Oct 2006 23:06:00 +0100, P Witte <[EMAIL PROTECTED]> wrote:
> Rich Mellor writes: > >> Now, if you had the SBASIC/SuperBASIC Reference Manual, you would be >> able >> to find out this weird and wonderful information (ok enough of the >> plug). >> >> As we cannot post attachments to the list, I have placed a copy of the >> description from the Reference Manual at: >> http://www.rwapsoftware.co.uk/DOC/SCALE.zip > <> >>> Given that by default the top edge of the window is 100 in the graphics >>> coordinate system, how do I find out what the right hand edge >>> coordinate >>> is, >>> based on the size of the window? Is this the same across platforms? The >>> figures I get dont appear to make sense! > > Thanks Rich, but I fear things have moved on. Your example program > doesnt do > it for QPC2 on a 1280x768 screen. I can find a new "line_diff" which > makes > it work for that screen size, but then it wont work on a 1660x1050 > screen. > Im sure there is a formula out there, but at present I cant find it. OK Per, if you want the real answer on how to do this on QPC2 etc, I will let you know how Q-Route does it (now here is a secret) - I rewrote BASIC versions of all the graphics commands I needed to allow access to them using the absolute co-ordinate system: The following takes absolute co-ordinates and converts them to the current graphics co-ordinate system: 2000 WINDOW #2,512,256,0,0 2010 graf_scale=100:SCALE #2,graf_scale,0,0 2020 window_x%=0:window_y%=0:window_h%=256:window_w%=256 2024 wind_scalex=(1/window_w%)*(graf_scale*(100/window_h%*window_w%/135.5)) 2028 wind_scaley=(1/window_h%)*graf_scale Now having set it up, we can convert absolute co-ords to graphics co-ords (remembering that one is upside down to the other), 3512 DEFine PROCedure RFLINE(linex1,liney1,linex2,liney2) 3516 LINE #2,linex1*wind_scalex,(window_h%-liney1)*wind_scaley TO linex2*wind_scalex,(window_h%-liney2)*wind_scaley 3520 END DEFine The constant 135.5 is close enough to the constant mentioned in the Reference Manual - it is just a matter of scaling the display to 512x256 -- Rich Mellor RWAP Services URL:http://www.rwapsoftware.co.uk URL:http://www.rwapadventures.com URL:http://www.rwapservices.co.uk URL:http://www.internetbusinessangels.com _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
