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flip the y coordinate sign

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Brooke Vibber 2025-02-22 20:24:04 -08:00
parent 6e66145ec6
commit 89b4e45901
1 changed files with 3 additions and 2 deletions
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mandel.s
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@ -1549,11 +1549,11 @@ minus:
dec zoom dec zoom
jmp done jmp done
up: up:
sub32 oy, oy, temp add32 oy, oy, temp
jsr display_coords jsr display_coords
jmp done jmp done
down: down:
add32 oy, oy, temp sub32 oy, oy, temp
jsr display_coords jsr display_coords
jmp done jmp done
left: left:
@ -1854,6 +1854,7 @@ not_skipped_mask:
zoom_factor cx, sx, aspect_x zoom_factor cx, sx, aspect_x
add32 cx, cx, ox add32 cx, cx, ox
zoom_factor cy, sy, aspect_y zoom_factor cy, sy, aspect_y
neg32 cy
add32 cy, cy, oy add32 cy, cy, oy
jsr mandelbrot jsr mandelbrot
jsr pset jsr pset