Hi Lee, There may be something in a PD toolkit but I am not aware of any. Once I wrote a screen saver with bouncing disks that bounced off the screen and each other. Collision detection was through keeping track of things the disks might hit in a table. Check table and update every time a disk was used. It was written in C. Here are 2 bits of SBASIC code one for detecting screen colour mode 8 (pore) and one for placing a pixel in screen coordinates (peer). Both from an excellent guide to SuperBasic by Donald Alcock. A useful book with examples if you can get a copy.
Regards 100 DEFine FuNction PEER(x,y) 110 LOCal a,p%,q%,shift% 120 a=131072+128*y+2*(x DIV 4) 130 shift%=2^(6-2*(x MOD 4)) 140 p%=PEEK(a) DIV shift% 150 q%=PEEK(a+1) DIV shift% 160 RETurn(p%&&1)*8||(p%&&2)*2||(q%&&3) 170 END DEFine 100 DEFine PROCedure PORE(x,y,pixel) 110 LOCal a,b%,q%,m% 120 a=131072+128*y+2*(x DIV 4) 130 IF a<131072 OR a>=163840 : RETurn 140 p%=(pixel&&4) DIV 2||(pixel&&8) DIV 8 150 q%=pixel&&3 160 shift%=2^(6-2*(x MOD 4)) 170 m%=~~(3*shift%) 180 POKE a,(PEEK(a)&&m%)||p%*shift% 190 POKE a+1,(PEEK(a+1)&&m%)||q%*shift% 200 END DEFine -----Original Message----- From: Lee Privett <lee.priv...@gmail.com> To: ql-us...@q-v-d.com Sent: Thu, 12 May 2011 18:49 Subject: Re: [Ql-Users] screen detection Weird it may be but unless there is some other sprite software I am not aware of (DPs I am having problems with), I do not know how to detect graphic collision without looking at the screen directly, unless there is another way? I don't know enough m/c to program in only S*Basic -----Original Message----- From: ql-users-boun...@lists.q-v-d.com [mailto:ql-users-boun...@lists.q-v-d.com] On Behalf Of Computer Research Centrum, Ltd Sent: 10 May 2011 10:51 To: ql-us...@q-v-d.com Subject: Re: [Ql-Users] screen detection >> The Spectrum had PLOT x,y ( I think) for switching on a pixel and the >> function POINT x,y for returning a value >> >> Obviously the QL has POINT which plots, so PEEK? >> >No inbuilt function, although various have been written, e.g. there is >one in DIY Toolkit somewhere. It is weird to use screen as input device. dex _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm _______________________________________________ QL-Users Mailing List http://www.q-v-d.demon.co.uk/smsqe.htm
