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63 lines
1.9 KiB
Lua
63 lines
1.9 KiB
Lua
%import diskio
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%import textio
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%import sprites
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%zeropage basicsafe
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%option no_sysinit
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; an example that displays and moves a single dragon (actually 2 sprites).
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main {
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; we choose arbitrary unused vram location for sprite data: $12000
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const ubyte SPRITE_DATA_BANK = 1
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const uword SPRITE_DATA_ADDR = $2000
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const ubyte SPRITE_PALETTE_OFFSET_IDX = 16
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sub start() {
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txt.plot(32,30)
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txt.print("there be dragons!")
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; load the sprite data and color palette directly into Vera ram
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void diskio.vload_raw("dragonsprite.bin", SPRITE_DATA_BANK, SPRITE_DATA_ADDR)
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void diskio.vload_raw("dragonsprite.pal", 1, $fa00 + SPRITE_PALETTE_OFFSET_IDX*2)
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; initialize the dragon sprites
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sprites.init(1, SPRITE_DATA_BANK, SPRITE_DATA_ADDR, sprites.SIZE_64, sprites.SIZE_64, sprites.COLORS_16, SPRITE_PALETTE_OFFSET_IDX)
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sprites.init(2, SPRITE_DATA_BANK, SPRITE_DATA_ADDR + 64*64/2, sprites.SIZE_64, sprites.SIZE_64, sprites.COLORS_16,SPRITE_PALETTE_OFFSET_IDX)
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ubyte tt = 0
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word xpos = -64
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word ypos
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bool flippedx = false
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sprites.pos(1, 0, 100)
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sprites.pos(2, 100, 300)
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repeat {
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if flippedx
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xpos -= 2
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else
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xpos += 2
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if xpos >= 640 or xpos <= -64
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flippedx = not flippedx
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ypos = (240-64 as word) + math.sin8(tt)
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tt++
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txt.plot(32, 32)
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txt.print("at: ")
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txt.print_w(sprites.getx(1))
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txt.chrout(',')
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txt.print_w(sprites.gety(1))
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txt.print(" ")
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sys.waitvsync()
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; we set absolute sprite position, rather than the relative move() routines
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sprites.pos(1, xpos, ypos)
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sprites.pos(2, xpos, ypos+64)
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sprites.flipx(1, flippedx)
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sprites.flipx(2, flippedx)
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}
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}
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}
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