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grab.bas
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grab.bas
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1 cl$=chr$(27)+"q":poke $d020,11,14
2 ff=0:gosub 1200
10 rem *** screen capture ***
20 rem 1. press 'space' key on top-left point
30 rem 2. then use cursor keys to move to bottom-right point & press 'space'
40 rem 3. provide a filename to save to
50 x=0:y=0:s=0:sv=0
51 if peek($5fffe)<>71 or peek($5ffff)<>73 then wpoke $5fffe,$4947:poke $42000,0:rem check for magic marker at end of bank 5, if not there, initialise b4 mem
55 cursor 0,49:gosub 1100:print cl$;"block count=";peek($42000);", next-free=$";hex$(z);
60 if s=0 then t1=peek($40800+x+y*80):c1=peek($ff80000+x+y*80):x0=x:y0=y
65 if s=1 then t2=peek($40800+x+y*80):c2=peek($ff80000+x+y*80):x1=x:y1=y
70 poke $40800+x+y*80,43:poke $ff80000+x+y*80,1
80 getkey a$
85 if a$<>" " then gosub 1000
90 if a$="{left}" and x>0 then x=x-1
100 if a$="{rght}" and x<79 then x=x+1
101 if a$=";" and sv>0 then sv=sv-1:gosub 1300
102 if a$=":" and sv<8 then sv=sv+1:gosub 1300
103 if a$="]" and sg>0 then sg=sg-1:gosub 1400
104 if a$="[" and sg<8 then sg=sg+1:gosub 1400
110 if a$="{up}" and y>0 then y=y-1
120 if a$="{down}" and y<49 then y=y+1
121 if a$="c" then print "{clr}";:b=0:gosub 620
122 if a$="-" and ff>0 then ff=ff-1:b=ff:gosub 620
124 if a$="=" and ff<peek($42000) then ff=ff+1:b=ff:gosub 620
130 if a$=" " then s=s+1:gosub 1000:if s=2 then goto 150
132 if a$="l" then gosub 600:rem load block
133 if a$="x" then cursor 0,0:end
135 gosub 1050
140 goto 60
150 rem *** restore original chars and save block to memory ***
160 rem - save x,y,w,h,data
170 poke $40800+x0+y0*80,t1:poke $ff80000+x0+y0*80,c1
180 poke $40800+x+y*80,t2:poke $ff80000+x+y*80,c2
190 i=peek($42000):rem block count
200 gosub 1100:rem locate next free byte
220 z=$42000+l
230 poke z,x0:z=z+1
240 poke z,y0:z=z+1
250 poke z,x-x0+1:z=z+1
260 poke z,y-y0+1:z=z+1
270 for yy=y0 to y
280 for xx=x0 to x
290 poke z,peek($40800+xx+yy*80):z=z+1
310 next xx
320 next yy
321 for yy=y0 to y
322 for xx=x0 to x
323 poke z,peek($ff80000+xx+yy*80):z=z+1
324 next xx
325 next yy
330 poke $42000,i+1
350 cursor 0,49:print cl$;"block count=";peek($42000);", next-free=$";hex$(z);
360 cursor 0,0:end
600 rem *** load block ***
610 print "{home}";cl$;:input "block#";b
620 mx=peek($42000):z=$42001:i=0
630 if i>=mx then cursor 0,0:print cl$;"invalid block#!";:return
640 rem traverse to find block
650 if i=b then goto 720:rem found
660 z=z+2:rem skip x,y
670 w=peek(z):z=z+1
680 h=peek(z):z=z+1
690 z=z+w*h*2
700 i=i+1
710 goto 630
720 rem found, now load it
730 x=peek(z):z=z+1
740 y=peek(z):z=z+1
750 w=peek(z):z=z+1:x1=x+w-1
760 h=peek(z):z=z+1:y1=y+h-1
765 print "{home}";cl$;"x=";x;", y=";y;", w=";w;", h=";h;", z=$";hex$(z);"{down}";chr$(27);"j";cl$;"frame=";ff;", nxt=$";hex$(z+w*h*2);
767 zz=z+w*h:p=$40800+x+y*80:pp=$ff80000+x+y*80
770 for yy=y to y1
780 edma 0, w, z, p
790 edma 0, w, zz, pp
800 z=z+w:zz=zz+w:p=p+80:pp=pp+80
820 next yy
830 return
999 cursor 0,0:end
1000 rem *** if movement, restore original char ***
1010 if a$<>" " then begin
1020 if s=0 then poke $40800+x+y*80,t1:poke $ff80000+x+y*80,c1
1030 if s=1 then poke $40800+x+y*80,t2:poke $ff80000+x+y*80,c2
1040 bend
1045 return
1049 rem *** show coords ***
1050 cursor 0,49:print " ";:cursor 0,49
1055 if s=0 then print chr$(27)+"qx=";x;", y=";y;
1060 if s=1 then print chr$(27)+"qx=";x0;", y=";y0;", w=";x-x0+1;", h=";y-y0+1;
1070 print " ";
1080 return
1100 rem *** locate next free byte ***
1110 z=$42001:mx=peek($42000):i=0
1120 if i=mx then l=z-$42000:return
1130 z=z+2
1140 w=peek(z):z=z+1
1150 h=peek(z):z=z+1
1160 z=z+w*h*2
1170 i=i+1:goto 1120
1200 rem *** store 1st 32 default colours ***
1210 dim dr(32),dg(32),db(32)
1220 for k=0 to 31
1230 dr(k)=peek($d100+k):dg(k)=peek($d200+k):db(k)=peek($d300+k)
1240 next k
1250 return
1300 rem *** fade all colours by value sv (0-8) ***
1305 sz = (8-sv)/8
1310 for k=0 to 31
1320 poke $d100+k, dr(k)*sz
1330 poke $d200+k, dg(k)*sz
1340 poke $d300+k, db(k)*sz
1350 next k
1360 return
1400 rem *** fade all colours to greyscale sgclose(0-8) ***
1410 sz = (8-sg)/8
1420 for k=0 to 31
1430 gr=(dr(k)+dg(k)+db(k))/3
1440 poke $d100+k, int(gr+(dr(k)-gr)*sz)
1450 poke $d200+k, int(gr+(dg(k)-gr)*sz)
1460 poke $d300+k, int(gr+(db(k)-gr)*sz)
1470 next k
1480 return