Apple-2-SW/prog8
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created own circle and disc subroutines for cx16 because its rom routine is not yet implemented and just does a BRK

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This commit is contained in:
Irmen de Jong 2020-09-22 02:52:09 +02:00
parent aa8191d0a1
commit 9389791d91
2 changed files with 111 additions and 11 deletions
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120
compiler/res/prog8lib/cx16/graphics.p8
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@ -29,26 +29,124 @@ graphics {
}
sub circle(uword xcenter, ubyte ycenter, ubyte radius) {
cx16.r0 = xcenter - radius/2
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.r0 = xcenter - radius/2
;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
; Midpoint algorithm
ubyte @zp xx = radius
ubyte @zp yy = 0
byte @zp decisionOver2 = 1-xx as byte
while xx>=yy {
cx16.r0 = xcenter + xx
cx16.r1 = ycenter + yy
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter - xx
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter + xx
cx16.r1 = ycenter - yy
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter - xx
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter + yy
cx16.r1 = ycenter + xx
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter - yy
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter + yy
cx16.r1 = ycenter - xx
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
cx16.r0 = xcenter - yy
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
yy++
if decisionOver2<=0 {
decisionOver2 += 2*yy+1
} else {
xx--
decisionOver2 += 2*(yy-xx)+1
}
}
}
sub disc(uword xcenter, ubyte ycenter, ubyte radius) {
cx16.r0 = xcenter - radius/2
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.r0 = xcenter - radius/2
; 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
ubyte xx = radius
ubyte yy = 0
byte decisionOver2 = 1-xx as byte
while xx>=yy {
ubyte ycenter_plus_yy = ycenter + yy
ubyte ycenter_min_yy = ycenter - yy
ubyte ycenter_plus_xx = ycenter + xx
ubyte ycenter_min_xx = ycenter - xx
uword @zp plotx
for plotx in xcenter to xcenter+xx {
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-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.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)
}
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
else {
xx--
decisionOver2 += 2*(yy-xx)+1
}
}
}
sub plot(uword plotx, ubyte ploty) {
cx16.r0 = plotx
cx16.r1 = ploty
cx16.FB_cursor_position()
cx16.FB_cursor_position()
cx16.FB_set_pixel(1)
}
}

2
examples/test.p8
View File

@ -8,6 +8,8 @@ main {
sub start() {
decisionOver2 += 2*yy+1 ; TODO why is the +1 not converted to decisionOver2++ separately?
; cx16.screen_set_mode(128)
ubyte width = txt.width()