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optimized disc (filled circle) drawing on cx16

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This commit is contained in:
Irmen de Jong 2020-12-06 00:01:19 +01:00
parent 44019d1a61
commit fa2d87f3dd
1 changed files with 23 additions and 35 deletions
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42
compiler/res/prog8lib/cx16/graphics.p8
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@ -21,7 +21,7 @@ graphics {
sub disable_bitmap_mode() {
; enables text mode, erase the text screen, color white
void cx16.screen_set_mode(2)
txt.fill_screen(' ', 1) ; TODO doesn't seem to fully clear the text screen after returning from gfx mode
txt.fill_screen(' ', 1) ; doesn't seem to fully clear the text screen after returning from gfx mode
}
@ -43,7 +43,7 @@ graphics {
;cx16.r1 = ycenter - radius/2
;cx16.r2 = radius*2
;cx16.r3 = radius*2
;cx16.GRAPH_draw_oval(false) ; TODO currently is not implemented on cx16, does a BRK
;cx16.GRAPH_draw_oval(false) ; currently this call is not implemented on cx16, does a BRK
; Midpoint algorithm
ubyte @zp xx = radius
@ -94,7 +94,7 @@ graphics {
; cx16.r1 = ycenter - radius/2
; cx16.r2 = radius*2
; cx16.r3 = radius*2
; cx16.GRAPH_draw_oval(true) ; TODO currently is not implemented on cx16, does a BRK
; cx16.GRAPH_draw_oval(true) ; currently this call is not implemented on cx16, does a BRK
ubyte xx = radius
ubyte yy = 0
@ -107,42 +107,30 @@ graphics {
ubyte ycenter_min_xx = ycenter - xx
uword @zp plotx
for plotx in xcenter to xcenter+xx {
cx16.r0 = plotx
cx16.r0 = xcenter-xx
cx16.r1 = ycenter_plus_yy
cx16.FB_cursor_position()
repeat xx*2
cx16.FB_set_pixel(1)
cx16.r0 = xcenter-xx
cx16.r1 = ycenter_min_yy
cx16.FB_cursor_position()
repeat xx*2
cx16.FB_set_pixel(1)
}
for plotx in xcenter-xx to xcenter-1 {
cx16.r0 = plotx
cx16.r1 = ycenter_plus_yy
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
cx16.r1 = ycenter_min_yy
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
}
for plotx in xcenter to xcenter+yy {
cx16.r0 = plotx
cx16.r0 = xcenter-yy
cx16.r1 = ycenter_plus_xx
cx16.FB_cursor_position()
repeat yy*2
cx16.FB_set_pixel(1)
cx16.r0 = xcenter-yy
cx16.r1 = ycenter_min_xx
cx16.FB_cursor_position()
repeat yy*2
cx16.FB_set_pixel(1)
}
for plotx in xcenter-yy to xcenter {
cx16.r0 = plotx
cx16.r1 = ycenter_plus_xx
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
cx16.r1 = ycenter_min_xx
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
}
yy++
if decisionOver2<=0
decisionOver2 += 2*yy+1