mirror of
https://github.com/irmen/prog8.git
synced 2024-11-03 13:07:54 +00:00
139 lines
4.3 KiB
Lua
139 lines
4.3 KiB
Lua
%target cx16
|
|
%import syslib
|
|
%import textio
|
|
|
|
; Bitmap pixel graphics module for the CommanderX16
|
|
; wraps the graphics functions that are in ROM.
|
|
; only black/white monchrome 320x200 for now. (i.e. truncated at the bottom)
|
|
; For full-screen 640x480 or 320x240 graphics, use the "gfx2" module instead. (but that is Cx16-specific)
|
|
; Note: there is no color palette manipulation here, you have to do that yourself or use the "palette" module.
|
|
|
|
|
|
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.GRAPH_init(0)
|
|
clear_screen(1, 0)
|
|
}
|
|
|
|
sub disable_bitmap_mode() {
|
|
; enables text mode, erase the text screen, color white
|
|
void cx16.screen_set_mode(2)
|
|
txt.fill_screen(' ', 1) ; doesn't seem to fully clear the text screen after returning from gfx mode
|
|
}
|
|
|
|
|
|
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.GRAPH_draw_line(x1, y1, x2, y2)
|
|
}
|
|
|
|
sub fillrect(uword x, uword y, uword width, uword height) {
|
|
cx16.GRAPH_draw_rect(x, y, width, height, 0, 1)
|
|
}
|
|
|
|
sub rect(uword x, uword y, uword width, uword height) {
|
|
cx16.GRAPH_draw_rect(x, y, width, height, 0, 0)
|
|
}
|
|
|
|
sub horizontal_line(uword x, uword y, uword length) {
|
|
if length
|
|
cx16.GRAPH_draw_line(x, y, x+length-1, y)
|
|
}
|
|
|
|
sub vertical_line(uword x, uword y, uword height) {
|
|
if height
|
|
cx16.GRAPH_draw_line(x, y, x, y+height-1)
|
|
}
|
|
|
|
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) ; currently this call is not implemented on cx16, does a BRK
|
|
|
|
; Midpoint algorithm
|
|
if radius==0
|
|
return
|
|
ubyte @zp xx = radius
|
|
ubyte @zp yy = 0
|
|
word @zp decisionOver2 = (1 as word)-xx
|
|
|
|
while xx>=yy {
|
|
cx16.r0 = xcenter + xx
|
|
cx16.r1 = ycenter + yy
|
|
cx16.FB_cursor_position2()
|
|
cx16.FB_set_pixel(1)
|
|
cx16.r0 = xcenter - xx
|
|
cx16.FB_cursor_position2()
|
|
cx16.FB_set_pixel(1)
|
|
cx16.r0 = xcenter + xx
|
|
cx16.r1 = ycenter - yy
|
|
cx16.FB_cursor_position2()
|
|
cx16.FB_set_pixel(1)
|
|
cx16.r0 = xcenter - xx
|
|
cx16.FB_cursor_position2()
|
|
cx16.FB_set_pixel(1)
|
|
cx16.r0 = xcenter + yy
|
|
cx16.r1 = ycenter + xx
|
|
cx16.FB_cursor_position2()
|
|
cx16.FB_set_pixel(1)
|
|
cx16.r0 = xcenter - yy
|
|
cx16.FB_cursor_position2()
|
|
cx16.FB_set_pixel(1)
|
|
cx16.r0 = xcenter + yy
|
|
cx16.r1 = ycenter - xx
|
|
cx16.FB_cursor_position2()
|
|
cx16.FB_set_pixel(1)
|
|
cx16.r0 = xcenter - yy
|
|
cx16.FB_cursor_position2()
|
|
cx16.FB_set_pixel(1)
|
|
yy++
|
|
if decisionOver2<=0 {
|
|
decisionOver2 += (yy as word)*2+1
|
|
} else {
|
|
xx--
|
|
decisionOver2 += (yy as word -xx)*2+1
|
|
}
|
|
}
|
|
}
|
|
|
|
sub disc(uword xcenter, ubyte ycenter, ubyte radius) {
|
|
if radius==0
|
|
return
|
|
ubyte @zp yy = 0
|
|
word decisionOver2 = (1 as word)-radius
|
|
|
|
while radius>=yy {
|
|
horizontal_line(xcenter-radius, ycenter+yy, radius*2+1)
|
|
horizontal_line(xcenter-radius, ycenter-yy, radius*2+1)
|
|
horizontal_line(xcenter-yy, ycenter+radius, yy*2+1)
|
|
horizontal_line(xcenter-yy, ycenter-radius, yy*2+1)
|
|
yy++
|
|
if decisionOver2<=0
|
|
decisionOver2 += (yy as word)*2+1
|
|
else {
|
|
radius--
|
|
decisionOver2 += (yy as word -radius)*2+1
|
|
}
|
|
}
|
|
}
|
|
|
|
inline asmsub plot(uword plotx @R0, uword ploty @R1) clobbers(A, X, Y) {
|
|
%asm {{
|
|
jsr cx16.FB_cursor_position
|
|
lda #1
|
|
jsr cx16.FB_set_pixel
|
|
}}
|
|
}
|
|
}
|