mirror of
https://github.com/irmen/prog8.git
synced 2024-11-23 07:32:10 +00:00
116 lines
3.0 KiB
Lua
116 lines
3.0 KiB
Lua
%import math
|
|
|
|
; Draw sine and cosine graphs. The sine and cosine functions are table lookups
|
|
; where the tables are generated by 64tass list functions.
|
|
|
|
; Note: this program is compatible with CX16 only.
|
|
; it doesn't work correctly on C64 because the bitmap screen data overlaps
|
|
; the program itself in memory $2000-...
|
|
|
|
|
|
main {
|
|
const uword width = 320
|
|
const ubyte height = 200
|
|
|
|
sub start() {
|
|
sys.gfx_enable(0) ; enable lo res screen
|
|
|
|
sincos255()
|
|
sys.wait(120)
|
|
|
|
sys.gfx_clear(0)
|
|
|
|
sincos180()
|
|
sys.wait(120)
|
|
|
|
sys.gfx_clear(0)
|
|
circles()
|
|
|
|
sys.wait(120)
|
|
}
|
|
|
|
sub sincos255() {
|
|
graphics_line(256)
|
|
|
|
ubyte pixelyb
|
|
ubyte pixelxb
|
|
byte pixelys
|
|
|
|
for pixelxb in 0 to 255 {
|
|
pixelyb = math.cos8u(pixelxb) / 2
|
|
sys.gfx_plot(pixelxb, pixelyb+20, 255)
|
|
pixelyb = math.sin8u(pixelxb) / 2
|
|
sys.gfx_plot(pixelxb, pixelyb+20, 255)
|
|
}
|
|
|
|
for pixelxb in 0 to 255 {
|
|
pixelys = math.cos8(pixelxb) / 2
|
|
sys.gfx_plot(pixelxb, pixelys as uword + 90, 255)
|
|
pixelys = math.sin8(pixelxb) / 2
|
|
sys.gfx_plot(pixelxb, pixelys as uword + 90, 255)
|
|
}
|
|
}
|
|
|
|
sub sincos180() {
|
|
graphics_line(180)
|
|
|
|
ubyte pixelyb
|
|
ubyte pixelxb
|
|
byte pixelys
|
|
|
|
for pixelxb in 0 to 179 {
|
|
pixelyb = math.cosr8u(pixelxb) / 2
|
|
sys.gfx_plot(pixelxb, pixelyb+20, 255)
|
|
pixelyb = math.sinr8u(pixelxb) / 2
|
|
sys.gfx_plot(pixelxb, pixelyb+20, 255)
|
|
}
|
|
|
|
for pixelxb in 0 to 179 {
|
|
pixelys = math.cosr8(pixelxb) / 2
|
|
sys.gfx_plot(pixelxb, pixelys as uword + 90, 255)
|
|
pixelys = math.sinr8(pixelxb) / 2
|
|
sys.gfx_plot(pixelxb, pixelys as uword + 90, 255)
|
|
}
|
|
}
|
|
|
|
sub circles() {
|
|
ubyte pixelyb
|
|
uword pixelxw
|
|
ubyte r
|
|
|
|
; circle with "degrees" from 0 to 255
|
|
for r in 0 to 255 {
|
|
pixelxw = (math.sin8(r)/2 as uword) + 80
|
|
pixelyb = (math.cos8(r)/2 as uword + height/2) as ubyte
|
|
sys.gfx_plot(pixelxw, pixelyb, 255)
|
|
}
|
|
|
|
for r in 0 to 255 {
|
|
pixelxw = math.sin8u(r)/2
|
|
pixelyb = math.cos8u(r)/2
|
|
sys.gfx_plot(pixelxw + 16, pixelyb+50, 255)
|
|
}
|
|
|
|
; circle with half-degrees from 0 to 179 (=full degrees 0..358 with steps of 2 degrees)
|
|
for r in 0 to 179 {
|
|
pixelxw = (math.sinr8(r) as word /2 + 220) as uword
|
|
pixelyb = (math.cosr8(r)/2 + height/2) as ubyte
|
|
sys.gfx_plot(pixelxw, pixelyb, 255)
|
|
}
|
|
|
|
for r in 0 to 179 {
|
|
pixelxw = math.sinr8u(r)/2
|
|
pixelyb = math.cosr8u(r)/2
|
|
sys.gfx_plot(pixelxw + 156, pixelyb+50, 255)
|
|
}
|
|
}
|
|
|
|
sub graphics_line(uword x) {
|
|
uword y
|
|
for y in 0 to height-1 {
|
|
sys.gfx_plot(x, y, 100)
|
|
}
|
|
}
|
|
|
|
}
|