Home » Archimedes archive » Acorn Computing » 1994 03.adf » 9403 » Draw/Example1
Draw/Example1
This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.
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| Tape/disk: | Home » Archimedes archive » Acorn Computing » 1994 03.adf » 9403 |
| Filename: | Draw/Example1 |
| Read OK: | ✔ |
| File size: | 0930 bytes |
| Load address: | 0000 |
| Exec address: | 0000 |
File contents
10REM > Example1 20 30REM The draw module - Example 1 40REM Demonstrate transformation matrices 50REM by Ben Summers 60 70 80ONERROR REPORT:PRINT" at line "ERL:END 90@% = &020208 100 110 120MODE 12 130 140 150REM first, make a path... 160 170RESTORE 180DIM path% 1024 190 200n = 0 210REPEAT 220 READ e% 230 path%!(n*4) = e% 240 n += 1 250UNTIL e% = -1 260 270DATA 2,0,0, 8,46080,0, 8,46080,46080, 8,0,46080, 8,0,0, 4 280DATA 2,51840,0, 6,0,23040,63360,80640,92160,92160, 4, 0, -1 290 300OFF 310 320axis_scale_unit% = 180 330DIM transform% 32 340 350REPEAT 360 370 CLS 380 ORIGIN 640,512 390 400 REM plot the path without any transformation 410 SYS "ColourTrans_SetGCOL",&00FF0000,,,0,0 420 430 PROCstroke_path(1, 0, 0, 1) 440 450 REM label the axis 460 VDU 5 470 MOVE 180,0 480 PRINT "X" 490 MOVE -16,180 500 PRINT "Y" 510 VDU 4 520 530 REM set the axis... 540 550 PRINT "Click to set x-axis" 560 PROCdo_drag(x_x%, x_y%, "X") 570 a = x_x% / axis_scale_unit% 580 b = x_y% / axis_scale_unit% 590 600 PRINT "Click to set y-axis" 610 PROCdo_drag(y_x%, y_y%, "Y") 620 c = y_x% / axis_scale_unit% 630 d = y_y% / axis_scale_unit% 640 650 PRINT "a = "a 660 PRINT "b = "b 670 PRINT "c = "c 680 PRINT "d = "d 690 700 710 720 REM plot that path 730 SYS "ColourTrans_SetGCOL",&FFFFFF00,,,0,0 740 750 PROCstroke_path(a, b, c, d) 760 770 780 PRINT TAB(0,31)"Click mouse to set another set of axis, ESCAPE to end"; 790 REPEAT:MOUSE mx%,my%,mb%:UNTIL mb% <> 0 800 REPEAT:MOUSE mx%,my%,mb%:UNTIL mb% = 0 810 820UNTIL FALSE 830 840END 850 860 870 880DEFPROCstroke_path(a, b, c, d) 890 REM I'm using internal draw units for my path elements. 900 user_unit_scale = 1 910 920 REM make up a matrix for drawing the path 930 940 transform%!0 = (user_unit_scale * a) * 2^16 950 transform%!4 = (user_unit_scale * b) * 2^16 960 transform%!8 = (user_unit_scale * c) * 2^16 970 transform%!12 = (user_unit_scale * d) * 2^16 980 transform%!16 = 0 990 transform%!20 = 0 1000 1010 SYS "Draw_Stroke",path%,0,transform%,0,0,0,0 1020ENDPROC 1030 1040 1050 1060 1070 1080DEFPROCdo_drag(RETURN x%, RETURN y%, s$) 1090 LOCAL mx%,my%,mb% 1100 1110 VDU 5 1120 MOUSE mx%,my%,mb% 1130 SYS "ColourTrans_SetGCOL",&0000FF00,,,256,3 1140 MOVE 0,0:DRAW mx%,my% 1150 PRINT s$ 1160 x% = mx%:y% = my% 1170 REPEAT 1180 MOUSE mx%,my%,mb% 1190 1200 IF mx% <> x% OR my% <> y% THEN 1210 MOVE 0,0 1220 DRAW x%,y% 1230 PRINT s$ 1240 MOVE 0,0 1250 DRAW mx%,my% 1260 PRINT s$ 1270 x% = mx%:y% = my% 1280 ENDIF 1290 UNTIL mb% <> 0 1300 1310 REPEAT:MOUSE mx%,my%,mb%:UNTIL mb% = 0 1320 VDU 4 1330 OFF 1340 1350ENDPROC 1360 1370
� > Example1
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� 00000000 0d 00 0a 10 f4 20 3e 20 45 78 61 6d 70 6c 65 31 |..... > Example1| 00000010 0d 00 14 04 0d 00 1e 21 f4 20 54 68 65 20 64 72 |.......!. The dr| 00000020 61 77 20 6d 6f 64 75 6c 65 20 2d 20 45 78 61 6d |aw module - Exam| 00000030 70 6c 65 20 31 0d 00 28 29 f4 20 44 65 6d 6f 6e |ple 1..(). Demon| 00000040 73 74 72 61 74 65 20 74 72 61 6e 73 66 6f 72 6d |strate transform| 00000050 61 74 69 6f 6e 20 6d 61 74 72 69 63 65 73 0d 00 |ation matrices..| 00000060 32 14 f4 20 62 79 20 42 65 6e 20 53 75 6d 6d 65 |2.. by Ben Summe| 00000070 72 73 0d 00 3c 04 0d 00 46 04 0d 00 50 18 ee 85 |rs..<...F...P...| 00000080 20 f6 3a f1 22 20 61 74 20 6c 69 6e 65 20 22 9e | .:." at line ".| 00000090 3a e0 0d 00 5a 10 40 25 20 3d 20 26 30 32 30 32 |:...Z.@% = &0202| 000000a0 30 38 0d 00 64 04 0d 00 6e 04 0d 00 78 08 eb 20 |08..d...n...x.. | 000000b0 31 32 0d 00 82 04 0d 00 8c 04 0d 00 96 1b f4 20 |12............. | 000000c0 66 69 72 73 74 2c 20 6d 61 6b 65 20 61 20 70 61 |first, make a pa| 000000d0 74 68 2e 2e 2e 0d 00 a0 04 0d 00 aa 05 f7 0d 00 |th..............| 000000e0 b4 10 de 20 70 61 74 68 25 20 31 30 32 34 0d 00 |... path% 1024..| 000000f0 be 04 0d 00 c8 09 6e 20 3d 20 30 0d 00 d2 05 f5 |......n = 0.....| 00000100 0d 00 dc 0a 20 20 f3 20 65 25 0d 00 e6 16 20 20 |.... . e%.... | 00000110 70 61 74 68 25 21 28 6e 2a 34 29 20 3d 20 65 25 |path%!(n*4) = e%| 00000120 0d 00 f0 0c 20 20 6e 20 2b 3d 20 31 0d 00 fa 0d |.... n += 1....| 00000130 fd 20 65 25 20 3d 20 2d 31 0d 01 04 04 0d 01 0e |. e% = -1.......| 00000140 3a dc 20 32 2c 30 2c 30 2c 20 38 2c 34 36 30 38 |:. 2,0,0, 8,4608| 00000150 30 2c 30 2c 20 38 2c 34 36 30 38 30 2c 34 36 30 |0,0, 8,46080,460| 00000160 38 30 2c 20 38 2c 30 2c 34 36 30 38 30 2c 20 38 |80, 8,0,46080, 8| 00000170 2c 30 2c 30 2c 20 34 0d 01 18 3c dc 20 32 2c 35 |,0,0, 4...<. 2,5| 00000180 31 38 34 30 2c 30 2c 20 36 2c 30 2c 32 33 30 34 |1840,0, 6,0,2304| 00000190 30 2c 36 33 33 36 30 2c 38 30 36 34 30 2c 39 32 |0,63360,80640,92| 000001a0 31 36 30 2c 39 32 31 36 30 2c 20 34 2c 20 30 2c |160,92160, 4, 0,| 000001b0 20 2d 31 0d 01 22 04 0d 01 2c 05 87 0d 01 36 04 | -1.."...,....6.| 000001c0 0d 01 40 1a 61 78 69 73 5f 73 63 61 6c 65 5f 75 |..@.axis_scale_u| 000001d0 6e 69 74 25 20 3d 20 31 38 30 0d 01 4a 13 de 20 |nit% = 180..J.. | 000001e0 74 72 61 6e 73 66 6f 72 6d 25 20 33 32 0d 01 54 |transform% 32..T| 000001f0 04 0d 01 5e 05 f5 0d 01 68 04 0d 01 72 07 20 20 |...^....h...r. | 00000200 db 0d 01 7c 10 20 20 c8 91 20 36 34 30 2c 35 31 |...|. .. 640,51| 00000210 32 0d 01 86 04 0d 01 90 30 20 20 f4 20 70 6c 6f |2.......0 . plo| 00000220 74 20 74 68 65 20 70 61 74 68 20 77 69 74 68 6f |t the path witho| 00000230 75 74 20 61 6e 79 20 74 72 61 6e 73 66 6f 72 6d |ut any transform| 00000240 61 74 69 6f 6e 0d 01 9a 2e 20 20 c8 99 20 22 43 |ation.... .. "C| 00000250 6f 6c 6f 75 72 54 72 61 6e 73 5f 53 65 74 47 43 |olourTrans_SetGC| 00000260 4f 4c 22 2c 26 30 30 46 46 30 30 30 30 2c 2c 2c |OL",&00FF0000,,,| 00000270 30 2c 30 0d 01 a4 04 0d 01 ae 1e 20 20 f2 73 74 |0,0........ .st| 00000280 72 6f 6b 65 5f 70 61 74 68 28 31 2c 20 30 2c 20 |roke_path(1, 0, | 00000290 30 2c 20 31 29 0d 01 b8 04 0d 01 c2 16 20 20 f4 |0, 1)........ .| 000002a0 20 6c 61 62 65 6c 20 74 68 65 20 61 78 69 73 0d | label the axis.| 000002b0 01 cc 09 20 20 ef 20 35 0d 01 d6 0d 20 20 ec 20 |... . 5.... . | 000002c0 31 38 30 2c 30 0d 01 e0 0b 20 20 f1 20 22 58 22 |180,0.... . "X"| 000002d0 0d 01 ea 0f 20 20 ec 20 2d 31 36 2c 31 38 30 0d |.... . -16,180.| 000002e0 01 f4 0b 20 20 f1 20 22 59 22 0d 01 fe 09 20 20 |... . "Y".... | 000002f0 ef 20 34 0d 02 08 04 0d 02 12 17 20 20 f4 20 73 |. 4........ . s| 00000300 65 74 20 74 68 65 20 61 78 69 73 2e 2e 2e 0d 02 |et the axis.....| 00000310 1c 04 0d 02 26 1d 20 20 f1 20 22 43 6c 69 63 6b |....&. . "Click| 00000320 20 74 6f 20 73 65 74 20 78 2d 61 78 69 73 22 0d | to set x-axis".| 00000330 02 30 1f 20 20 f2 64 6f 5f 64 72 61 67 28 78 5f |.0. .do_drag(x_| 00000340 78 25 2c 20 78 5f 79 25 2c 20 22 58 22 29 0d 02 |x%, x_y%, "X")..| 00000350 3a 21 20 20 61 20 3d 20 78 5f 78 25 20 2f 20 61 |:! a = x_x% / a| 00000360 78 69 73 5f 73 63 61 6c 65 5f 75 6e 69 74 25 0d |xis_scale_unit%.| 00000370 02 44 21 20 20 62 20 3d 20 78 5f 79 25 20 2f 20 |.D! b = x_y% / | 00000380 61 78 69 73 5f 73 63 61 6c 65 5f 75 6e 69 74 25 |axis_scale_unit%| 00000390 0d 02 4e 04 0d 02 58 1d 20 20 f1 20 22 43 6c 69 |..N...X. . "Cli| 000003a0 63 6b 20 74 6f 20 73 65 74 20 79 2d 61 78 69 73 |ck to set y-axis| 000003b0 22 0d 02 62 1f 20 20 f2 64 6f 5f 64 72 61 67 28 |"..b. .do_drag(| 000003c0 79 5f 78 25 2c 20 79 5f 79 25 2c 20 22 59 22 29 |y_x%, y_y%, "Y")| 000003d0 0d 02 6c 21 20 20 63 20 3d 20 79 5f 78 25 20 2f |..l! c = y_x% /| 000003e0 20 61 78 69 73 5f 73 63 61 6c 65 5f 75 6e 69 74 | axis_scale_unit| 000003f0 25 0d 02 76 21 20 20 64 20 3d 20 79 5f 79 25 20 |%..v! d = y_y% | 00000400 2f 20 61 78 69 73 5f 73 63 61 6c 65 5f 75 6e 69 |/ axis_scale_uni| 00000410 74 25 0d 02 80 04 0d 02 8a 0f 20 20 f1 20 22 61 |t%........ . "a| 00000420 20 3d 20 22 61 0d 02 94 0f 20 20 f1 20 22 62 20 | = "a.... . "b | 00000430 3d 20 22 62 0d 02 9e 0f 20 20 f1 20 22 63 20 3d |= "b.... . "c =| 00000440 20 22 63 0d 02 a8 0f 20 20 f1 20 22 64 20 3d 20 | "c.... . "d = | 00000450 22 64 0d 02 b2 04 0d 02 bc 04 0d 02 c6 04 0d 02 |"d..............| 00000460 d0 16 20 20 f4 20 70 6c 6f 74 20 74 68 61 74 20 |.. . plot that | 00000470 70 61 74 68 0d 02 da 2e 20 20 c8 99 20 22 43 6f |path.... .. "Co| 00000480 6c 6f 75 72 54 72 61 6e 73 5f 53 65 74 47 43 4f |lourTrans_SetGCO| 00000490 4c 22 2c 26 46 46 46 46 46 46 30 30 2c 2c 2c 30 |L",&FFFFFF00,,,0| 000004a0 2c 30 0d 02 e4 04 0d 02 ee 1e 20 20 f2 73 74 72 |,0........ .str| 000004b0 6f 6b 65 5f 70 61 74 68 28 61 2c 20 62 2c 20 63 |oke_path(a, b, c| 000004c0 2c 20 64 29 0d 02 f8 04 0d 03 02 04 0d 03 0c 46 |, d)...........F| 000004d0 20 20 f1 20 8a 30 2c 33 31 29 22 43 6c 69 63 6b | . .0,31)"Click| 000004e0 20 6d 6f 75 73 65 20 74 6f 20 73 65 74 20 61 6e | mouse to set an| 000004f0 6f 74 68 65 72 20 73 65 74 20 6f 66 20 61 78 69 |other set of axi| 00000500 73 2c 20 45 53 43 41 50 45 20 74 6f 20 65 6e 64 |s, ESCAPE to end| 00000510 22 3b 0d 03 16 21 20 20 f5 3a c8 97 20 6d 78 25 |";...! .:.. mx%| 00000520 2c 6d 79 25 2c 6d 62 25 3a fd 20 6d 62 25 20 3c |,my%,mb%:. mb% <| 00000530 3e 20 30 0d 03 20 20 20 20 f5 3a c8 97 20 6d 78 |> 0.. .:.. mx| 00000540 25 2c 6d 79 25 2c 6d 62 25 3a fd 20 6d 62 25 20 |%,my%,mb%:. mb% | 00000550 3d 20 30 0d 03 2a 04 0d 03 34 07 fd 20 a3 0d 03 |= 0..*...4.. ...| 00000560 3e 04 0d 03 48 05 e0 0d 03 52 04 0d 03 5c 04 0d |>...H....R...\..| 00000570 03 66 04 0d 03 70 1d dd f2 73 74 72 6f 6b 65 5f |.f...p...stroke_| 00000580 70 61 74 68 28 61 2c 20 62 2c 20 63 2c 20 64 29 |path(a, b, c, d)| 00000590 0d 03 7a 3c 20 20 f4 20 20 49 27 6d 20 75 73 69 |..z< . I'm usi| 000005a0 6e 67 20 69 6e 74 65 72 6e 61 6c 20 64 72 61 77 |ng internal draw| 000005b0 20 75 6e 69 74 73 20 66 6f 72 20 6d 79 20 70 61 | units for my pa| 000005c0 74 68 20 65 6c 65 6d 65 6e 74 73 2e 0d 03 84 19 |th elements.....| 000005d0 20 20 75 73 65 72 5f 75 6e 69 74 5f 73 63 61 6c | user_unit_scal| 000005e0 65 20 3d 20 31 0d 03 8e 04 0d 03 98 2d 20 20 f4 |e = 1.......- .| 000005f0 20 6d 61 6b 65 20 75 70 20 61 20 6d 61 74 72 69 | make up a matri| 00000600 78 20 66 6f 72 20 64 72 61 77 69 6e 67 20 74 68 |x for drawing th| 00000610 65 20 70 61 74 68 0d 03 a2 04 0d 03 ac 32 20 20 |e path.......2 | 00000620 74 72 61 6e 73 66 6f 72 6d 25 21 30 20 20 3d 20 |transform%!0 = | 00000630 28 75 73 65 72 5f 75 6e 69 74 5f 73 63 61 6c 65 |(user_unit_scale| 00000640 20 2a 20 61 29 20 2a 20 32 5e 31 36 0d 03 b6 32 | * a) * 2^16...2| 00000650 20 20 74 72 61 6e 73 66 6f 72 6d 25 21 34 20 20 | transform%!4 | 00000660 3d 20 28 75 73 65 72 5f 75 6e 69 74 5f 73 63 61 |= (user_unit_sca| 00000670 6c 65 20 2a 20 62 29 20 2a 20 32 5e 31 36 0d 03 |le * b) * 2^16..| 00000680 c0 32 20 20 74 72 61 6e 73 66 6f 72 6d 25 21 38 |.2 transform%!8| 00000690 20 20 3d 20 28 75 73 65 72 5f 75 6e 69 74 5f 73 | = (user_unit_s| 000006a0 63 61 6c 65 20 2a 20 63 29 20 2a 20 32 5e 31 36 |cale * c) * 2^16| 000006b0 0d 03 ca 32 20 20 74 72 61 6e 73 66 6f 72 6d 25 |...2 transform%| 000006c0 21 31 32 20 3d 20 28 75 73 65 72 5f 75 6e 69 74 |!12 = (user_unit| 000006d0 5f 73 63 61 6c 65 20 2a 20 64 29 20 2a 20 32 5e |_scale * d) * 2^| 000006e0 31 36 0d 03 d4 17 20 20 74 72 61 6e 73 66 6f 72 |16.... transfor| 000006f0 6d 25 21 31 36 20 3d 20 30 0d 03 de 17 20 20 74 |m%!16 = 0.... t| 00000700 72 61 6e 73 66 6f 72 6d 25 21 32 30 20 3d 20 30 |ransform%!20 = 0| 00000710 0d 03 e8 04 0d 03 f2 31 20 20 c8 99 20 22 44 72 |.......1 .. "Dr| 00000720 61 77 5f 53 74 72 6f 6b 65 22 2c 70 61 74 68 25 |aw_Stroke",path%| 00000730 2c 30 2c 74 72 61 6e 73 66 6f 72 6d 25 2c 30 2c |,0,transform%,0,| 00000740 30 2c 30 2c 30 0d 03 fc 05 e1 0d 04 06 04 0d 04 |0,0,0...........| 00000750 10 04 0d 04 1a 04 0d 04 24 04 0d 04 2e 04 0d 04 |........$.......| 00000760 38 1d dd f2 64 6f 5f 64 72 61 67 28 f8 20 78 25 |8...do_drag(. x%| 00000770 2c 20 f8 20 79 25 2c 20 73 24 29 0d 04 42 13 20 |, . y%, s$)..B. | 00000780 20 ea 20 6d 78 25 2c 6d 79 25 2c 6d 62 25 0d 04 | . mx%,my%,mb%..| 00000790 4c 04 0d 04 56 09 20 20 ef 20 35 0d 04 60 14 20 |L...V. . 5..`. | 000007a0 20 c8 97 20 6d 78 25 2c 6d 79 25 2c 6d 62 25 0d | .. mx%,my%,mb%.| 000007b0 04 6a 30 20 20 c8 99 20 22 43 6f 6c 6f 75 72 54 |.j0 .. "ColourT| 000007c0 72 61 6e 73 5f 53 65 74 47 43 4f 4c 22 2c 26 30 |rans_SetGCOL",&0| 000007d0 30 30 30 46 46 30 30 2c 2c 2c 32 35 36 2c 33 0d |000FF00,,,256,3.| 000007e0 04 74 15 20 20 ec 20 30 2c 30 3a df 20 6d 78 25 |.t. . 0,0:. mx%| 000007f0 2c 6d 79 25 0d 04 7e 0a 20 20 f1 20 73 24 0d 04 |,my%..~. . s$..| 00000800 88 17 20 20 78 25 20 3d 20 6d 78 25 3a 79 25 20 |.. x% = mx%:y% | 00000810 3d 20 6d 79 25 0d 04 92 07 20 20 f5 0d 04 9c 16 |= my%.... .....| 00000820 20 20 20 20 c8 97 20 6d 78 25 2c 6d 79 25 2c 6d | .. mx%,my%,m| 00000830 62 25 0d 04 a6 04 0d 04 b0 21 20 20 20 20 e7 20 |b%.......! . | 00000840 6d 78 25 20 3c 3e 20 78 25 20 84 20 6d 79 25 20 |mx% <> x% . my% | 00000850 3c 3e 20 79 25 20 8c 0d 04 ba 0f 20 20 20 20 20 |<> y% ..... | 00000860 20 ec 20 30 2c 30 0d 04 c4 11 20 20 20 20 20 20 | . 0,0.... | 00000870 df 20 78 25 2c 79 25 0d 04 ce 0e 20 20 20 20 20 |. x%,y%.... | 00000880 20 f1 20 73 24 0d 04 d8 0f 20 20 20 20 20 20 ec | . s$.... .| 00000890 20 30 2c 30 0d 04 e2 13 20 20 20 20 20 20 df 20 | 0,0.... . | 000008a0 6d 78 25 2c 6d 79 25 0d 04 ec 0e 20 20 20 20 20 |mx%,my%.... | 000008b0 20 f1 20 73 24 0d 04 f6 1b 20 20 20 20 20 20 78 | . s$.... x| 000008c0 25 20 3d 20 6d 78 25 3a 79 25 20 3d 20 6d 79 25 |% = mx%:y% = my%| 000008d0 0d 05 00 09 20 20 20 20 cd 0d 05 0a 10 20 20 fd |.... ..... .| 000008e0 20 6d 62 25 20 3c 3e 20 30 0d 05 14 04 0d 05 1e | mb% <> 0.......| 000008f0 20 20 20 f5 3a c8 97 20 6d 78 25 2c 6d 79 25 2c | .:.. mx%,my%,| 00000900 6d 62 25 3a fd 20 6d 62 25 20 3d 20 30 0d 05 28 |mb%:. mb% = 0..(| 00000910 09 20 20 ef 20 34 0d 05 32 07 20 20 87 0d 05 3c |. . 4..2. ...<| 00000920 04 0d 05 46 05 e1 0d 05 50 04 0d 05 5a 04 0d ff |...F....P...Z...| 00000930
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