mirror of
https://github.com/irmen/prog8.git
synced 2024-08-26 15:29:46 +00:00
147 lines
5.5 KiB
Lua
147 lines
5.5 KiB
Lua
%import math
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%import gfx2
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main {
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sub start() {
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gfx2.screen_mode(4)
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uword[128] flakes1_xx
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uword[128] flakes1_yy
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uword[128] flakes2_xx
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uword[128] flakes2_yy
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ubyte @zp idx
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for idx in 0 to 127 {
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flakes1_xx[idx] = math.rndw() % 320
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flakes1_yy[idx] = math.rndw() % 240
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flakes2_xx[idx] = math.rndw() % 320
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flakes2_yy[idx] = math.rndw() % 240
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}
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draw_screen()
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const ubyte FALLING_SNOW_COLOR = 1
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const ubyte FALLING_SNOW_COLOR2 = 12
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const ubyte PILED_SNOW_COLOR = 15
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ubyte[] PILED_SNOW_COLORS = [PILED_SNOW_COLOR, 5, 2] ; falling snow colors should NOT be in here!
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bool fall_layer_2 = false
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repeat {
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for idx in 0 to len(flakes1_xx)-1 {
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gfx2.plot(flakes1_xx[idx], flakes1_yy[idx], FALLING_SNOW_COLOR)
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gfx2.plot(flakes2_xx[idx], flakes2_yy[idx], FALLING_SNOW_COLOR2)
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}
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sys.waitvsync()
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for idx in 0 to len(flakes1_xx)-1 {
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if flakes1_yy[idx]==239 {
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; reached the floor
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gfx2.plot(flakes1_xx[idx], flakes1_yy[idx], PILED_SNOW_COLOR)
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flakes1_yy[idx] = 0
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flakes1_xx[idx] = math.rndw() % 320
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} else if gfx2.pget(flakes1_xx[idx], flakes1_yy[idx]+1) in PILED_SNOW_COLORS {
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; pile up
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; TODO somehow prevent growing horizontally/diagonally like a crystal
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uword @zp snowx = flakes1_xx[idx]
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if snowx!=0 and snowx!=319 { ; check to avoid x coordinate under/overflow
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uword pilex1
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uword pilex2
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if math.rnd() & 1 {
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pilex1 = snowx-1
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pilex2 = snowx+1
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} else {
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pilex1 = snowx+1
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pilex2 = snowx-1
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}
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ubyte pixel_side1 = gfx2.pget(pilex1, flakes1_yy[idx]+1)
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ubyte pixel_side2 = gfx2.pget(pilex2, flakes1_yy[idx]+1)
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if pixel_side1 == 0 or pixel_side1 == FALLING_SNOW_COLOR2 {
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gfx2.plot(snowx, flakes1_yy[idx], 0)
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gfx2.plot(pilex1, flakes1_yy[idx]+1, PILED_SNOW_COLOR)
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} else if pixel_side2 == 0 or pixel_side2 == FALLING_SNOW_COLOR2 {
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gfx2.plot(snowx, flakes1_yy[idx], 0)
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gfx2.plot(pilex2, flakes1_yy[idx]+1, PILED_SNOW_COLOR)
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} else {
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gfx2.plot(snowx, flakes1_yy[idx], PILED_SNOW_COLOR)
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}
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}
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flakes1_yy[idx] = 0
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flakes1_xx[idx] = math.rndw() % 320
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} else {
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; fall
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gfx2.plot(flakes1_xx[idx], flakes1_yy[idx], 0)
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flakes1_yy[idx]++
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when math.rnd() & 3 {
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1 -> {
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if flakes1_xx[idx]
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flakes1_xx[idx]--
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}
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2 -> {
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if flakes1_xx[idx] < 319
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flakes1_xx[idx]++
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}
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}
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}
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}
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fall_layer_2 = not fall_layer_2
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if fall_layer_2 {
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for idx in 0 to len(flakes2_xx)-1 {
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; the second 'layer' of snowflakes
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if flakes2_yy[idx]==239 {
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; reached the floor, don't pile up just fall again
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flakes2_yy[idx] = 0
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flakes2_xx[idx] = math.rndw() % 320
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} else if gfx2.pget(flakes2_xx[idx], flakes2_yy[idx]+1) in PILED_SNOW_COLORS {
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; reached an obstruction, don't pile up just fall again
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flakes2_yy[idx] = 0
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flakes2_xx[idx] = math.rndw() % 320
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} else {
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; fall normally
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gfx2.plot(flakes2_xx[idx], flakes2_yy[idx], 0)
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flakes2_yy[idx]+=1
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when math.rnd() & 3 {
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1 -> {
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if flakes2_xx[idx]
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flakes2_xx[idx]--
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}
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2 -> {
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if flakes2_xx[idx] < 319
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flakes2_xx[idx]++
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}
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}
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}
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}
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}
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}
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repeat {
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}
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}
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sub draw_screen() {
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gfx2.text(32, 130, 2, sc: "******************" )
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gfx2.text(40, 140, 5, sc: "happy holidays !" )
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gfx2.text(32, 150, 5, sc: "from commander x16" )
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gfx2.text(32, 160, 2, sc: "******************" )
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; draw a tree
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const uword TREEX = 240
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ubyte maxwidth = 20
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ubyte branchesy = 100
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gfx2.fillrect(TREEX-5, 210, 10, 30, 9)
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repeat 5 {
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ubyte width
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for width in 1 to maxwidth {
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gfx2.horizontal_line(TREEX-width/2, branchesy, width, 5)
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branchesy++
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}
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branchesy -= maxwidth/2
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maxwidth += 8
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}
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}
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}
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