mirror of
https://github.com/irmen/prog8.git
synced 2024-06-30 18:29:48 +00:00
157 lines
4.7 KiB
Lua
157 lines
4.7 KiB
Lua
%target cx16
|
|
%import syslib
|
|
|
|
; bitmap pixel graphics module for the CommanderX16
|
|
; wraps the graphics functions that are in ROM.
|
|
; only black/white monchrome 320x200 for now.
|
|
|
|
graphics {
|
|
const uword WIDTH = 320
|
|
const ubyte HEIGHT = 200
|
|
|
|
sub enable_bitmap_mode() {
|
|
; enable bitmap screen, erase it and set colors to black/white.
|
|
void cx16.screen_set_mode($80)
|
|
cx16.r0 = 0
|
|
cx16.GRAPH_init()
|
|
clear_screen(1, 0)
|
|
}
|
|
|
|
sub clear_screen(ubyte pixelcolor, ubyte bgcolor) {
|
|
cx16.GRAPH_set_colors(pixelcolor, pixelcolor, bgcolor)
|
|
cx16.GRAPH_clear()
|
|
}
|
|
|
|
sub line(uword @zp x1, ubyte @zp y1, uword @zp x2, ubyte @zp y2) {
|
|
cx16.r0 = x1
|
|
cx16.r1 = y1
|
|
cx16.r2 = x2
|
|
cx16.r3 = y2
|
|
cx16.GRAPH_draw_line()
|
|
}
|
|
|
|
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
|
|
|
|
; 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
|
|
|
|
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_set_pixel(1)
|
|
}
|
|
}
|
|
|
|
|