mirror of
https://github.com/irmen/prog8.git
synced 2024-07-05 06:29:02 +00:00
111 lines
2.9 KiB
Lua
111 lines
2.9 KiB
Lua
%import graphics
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%import math
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; Draw sine and cosine graphs. The sine and cosine functions are table lookups
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; where the tables are generated by 64tass list functions.
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; Note: this program is compatible with CX16 only.
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; it doesn't work correctly on C64 because the bitmap screen data overlaps
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; the program itself in memory $2000-...
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main {
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const uword width = 320
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const ubyte height = 200
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sub start() {
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graphics.enable_bitmap_mode()
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sincos255()
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sys.wait(120)
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graphics.clear_screen(1, 0)
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sincos180()
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sys.wait(120)
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graphics.clear_screen(1, 0)
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circles()
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repeat {
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}
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}
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sub sincos255() {
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graphics.line(256,0,256,height-1)
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ubyte pixelyb
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uword pixelyw
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ubyte pixelxb
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for pixelxb in 0 to 255 {
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pixelyb = math.cos8u(pixelxb) / 2
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graphics.plot(pixelxb, pixelyb)
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pixelyb = math.sin8u(pixelxb) / 2
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graphics.plot(pixelxb, pixelyb)
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}
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for pixelxb in 0 to 255 {
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pixelyw = math.cos16u(pixelxb) / 1024 + 120
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graphics.plot(pixelxb, pixelyw)
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pixelyw = math.sin16u(pixelxb) / 1024 + 120
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graphics.plot(pixelxb, pixelyw)
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}
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}
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sub sincos180() {
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graphics.line(180,0,180,height-1)
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ubyte pixelyb
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uword pixelyw
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ubyte pixelxb
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for pixelxb in 0 to 179 {
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pixelyb = math.cosr8u(pixelxb) / 2
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graphics.plot(pixelxb, pixelyb)
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pixelyb = math.sinr8u(pixelxb) / 2
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graphics.plot(pixelxb, pixelyb)
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}
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for pixelxb in 0 to 179 {
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pixelyw = math.cosr16u(pixelxb) / 1024 + 120
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graphics.plot(pixelxb, pixelyw)
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pixelyw = math.sinr16u(pixelxb) / 1024 + 120
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graphics.plot(pixelxb, pixelyw)
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}
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}
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sub circles() {
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ubyte pixelyb
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uword pixelxw
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ubyte r
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; circles with "degrees" from 0 to 255
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for r in 0 to 255 {
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pixelxw = ((math.sin8(r)/2 as word) + 80) as uword
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pixelyb = (math.cos8(r)/2 + height/2) as ubyte
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graphics.plot(pixelxw, pixelyb)
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}
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for r in 0 to 255 {
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pixelxw = (math.sin16(r)/1024 + 80) as uword
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pixelyb = (math.cos16(r)/1024 + height/2) as ubyte
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graphics.plot(pixelxw, pixelyb)
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}
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; circles with half-degrees from 0 to 179 (=full degrees 0..358 with steps of 2 degrees)
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for r in 0 to 179 {
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pixelxw = (math.sinr8(r) as word /2 + 220) as uword
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pixelyb = (math.cosr8(r)/2 + height/2) as ubyte
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graphics.plot(pixelxw, pixelyb)
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}
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for r in 0 to 179 {
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pixelxw = (math.sinr16(r) as word /1024 + 220) as uword
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pixelyb = (math.cosr16(r)/1024 + height/2) as ubyte
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graphics.plot(pixelxw, pixelyb)
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}
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}
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}
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