mirror of
https://git.sr.ht/~rabbits/uxn
synced 2024-11-23 14:25:10 +00:00
88 lines
No EOL
1.5 KiB
Text
88 lines
No EOL
1.5 KiB
Text
( tests/draw )
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%RTN { JMP2r }
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%RTN? { JMP2r? }
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;cursor { x 2 y 2 }
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;a { x 2 y 2 }
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;b { x 2 y 2 }
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;s { x 2 y 2 }
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|0100 @RESET
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#0020 #0020 #0070 #0080 ,draw-line JSR2
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#0020 #0080 #0070 #0030 ,draw-line JSR2
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#00a0 #0020 #0050 #00b0 ,draw-line JSR2
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#00b0 #0090 #0030 #0010 ,draw-line JSR2
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BRK
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@draw-line ( x1 y1 x2 y2 )
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=b.y =b.x ( target, b )
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=a.y =a.x ( target, a )
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~a.x =Screen.x ~a.y =Screen.y #02 =Screen.color
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~b.x =Screen.x ~b.y =Screen.y #02 =Screen.color
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( dx = abs[bx - ax] )
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~b.x ~a.x SUB2 ABS2 =d.x
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( dy = -abs[by - ay] )
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~b.y ~a.y SUB2 ABS2 #0000 SWP2 SUB2 =d.y
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( sx = ax < bx ? 1 : -1; )
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#ffff #00 ~a.x ~b.x LTH2 #0002 MUL2 ADD2 =s.x
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( sy = ay < by ? 1 : -1; )
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#ffff #00 ~a.y ~b.y LTH2 #0002 MUL2 ADD2 =s.y
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( err = dx + dy )
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~d.x ~d.y ADD2 =err
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( loop )
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$loop
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( putchr[ax, ay, color]; )
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~a.x =Screen.x ~a.y =Screen.y #01 =Screen.color
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( if[ax == bx && ay == by] break; )
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,$end ~a.x ~b.x EQU2 ~a.y ~b.y EQU2 #0101 EQU2 JMP2?
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( fallback, remove )
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,$end ~i #90 GTH JMP2? ~i #01 ADD =i
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( err2 = 2 * err; )
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~err #0002 MUL2 =err2
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~err2 =Console.short
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( if[err2 >= dy] )
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,$skipy ~err2 ~d.y LTH2 JMP2?
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( err += dy; )
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~err ~d.y ADD2 =err
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( ax += sx; )
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~a.x ~s.x ADD2 =a.x
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$skipy
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( if[err2 <= dx] )
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,$skipx ~err2 ~d.x GTH2 JMP2?
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( err += dx; )
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~err ~d.x ADD2 =err
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( ay += sy; )
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~a.y ~s.y ADD2 =a.y
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$skipx
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,$loop JMP2
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$end
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RTN
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|c000 @FRAME
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|d000 @ERROR
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|FF00 ;Console { pad 8 char 1 byte 1 short 2 }
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|FFF0 .RESET .FRAME .ERROR ( vectors )
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|FFF8 [ 13fd 1ef3 1bf2 ] ( palette ) |