prog8/compiler/res/prog8lib/cx16/graphics.p8

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%import syslib
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%import textio
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; Bitmap pixel graphics module for the CommanderX16
; wraps the graphics functions that are in ROM.
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; only black/white monochrome 320x200 for now. (i.e. truncated at the bottom)
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; 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 {
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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_mode($80, false)
cx16.GRAPH_init(0)
clear_screen(1, 0)
}
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sub disable_bitmap_mode() {
; enables text mode, erase the text screen, color white
void cx16.screen_mode(0, false)
txt.fill_screen(' ', 1) ; doesn't seem to fully clear the text screen after returning from gfx mode
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}
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
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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) {
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if radius==0
return
ubyte @zp yy = 0
word decisionOver2 = (1 as word)-radius
while radius>=yy {
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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
}
}
}
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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
}}
}
}