prog8/examples/cx16/sincos.p8

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%import graphics
%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() {
graphics.enable_bitmap_mode()
sincos255()
sys.wait(120)
graphics.clear_screen(1, 0)
sincos180()
sys.wait(120)
graphics.clear_screen(1, 0)
circles()
repeat {
}
}
sub sincos255() {
graphics.line(256,0,256,height-1)
ubyte pixelyb
uword pixelyw
ubyte pixelxb
for pixelxb in 0 to 255 {
pixelyb = math.cos8u(pixelxb) / 2
graphics.plot(pixelxb, pixelyb)
pixelyb = math.sin8u(pixelxb) / 2
graphics.plot(pixelxb, pixelyb)
}
for pixelxb in 0 to 255 {
pixelyw = math.cos16u(pixelxb) / 1024 + 120
graphics.plot(pixelxb, pixelyw)
pixelyw = math.sin16u(pixelxb) / 1024 + 120
graphics.plot(pixelxb, pixelyw)
}
}
sub sincos180() {
graphics.line(180,0,180,height-1)
ubyte pixelyb
uword pixelyw
ubyte pixelxb
for pixelxb in 0 to 179 {
pixelyb = math.cosr8u(pixelxb) / 2
graphics.plot(pixelxb, pixelyb)
pixelyb = math.sinr8u(pixelxb) / 2
graphics.plot(pixelxb, pixelyb)
}
for pixelxb in 0 to 179 {
pixelyw = math.cosr16u(pixelxb) / 1024 + 120
graphics.plot(pixelxb, pixelyw)
pixelyw = math.sinr16u(pixelxb) / 1024 + 120
graphics.plot(pixelxb, pixelyw)
}
}
sub circles() {
ubyte pixelyb
uword pixelxw
ubyte r
; circles with "degrees" from 0 to 255
for r in 0 to 255 {
pixelxw = ((math.sin8(r)/2 as word) + 80) as uword
pixelyb = (math.cos8(r)/2 + height/2) as ubyte
graphics.plot(pixelxw, pixelyb)
}
for r in 0 to 255 {
pixelxw = (math.sin16(r)/1024 + 80) as uword
pixelyb = (math.cos16(r)/1024 + height/2) as ubyte
graphics.plot(pixelxw, pixelyb)
}
; circles 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
graphics.plot(pixelxw, pixelyb)
}
for r in 0 to 179 {
pixelxw = (math.sinr16(r) as word /1024 + 220) as uword
pixelyb = (math.cosr16(r)/1024 + height/2) as ubyte
graphics.plot(pixelxw, pixelyb)
}
}
}