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https://github.com/irmen/prog8.git
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75 lines
2.0 KiB
Lua
75 lines
2.0 KiB
Lua
%import textio
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%zeropage basicsafe
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; Note: this program is compatible with C64 and CX16.
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main {
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sub start() {
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str input = ".........."
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ubyte ballCount
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ubyte[255] BX
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ubyte[255] BY
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ubyte[255] BC
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ubyte[255] DX
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ubyte[255] DY
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txt.print("number of balls (1-255)? ")
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void txt.input_chars(input)
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ballCount = conv.str2ubyte(input)
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txt.fill_screen(81, 0)
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; Setup Starting Ball Positions
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ubyte lp
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for lp in 0 to ballCount-1 {
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BX[lp] = rnd() % txt.DEFAULT_WIDTH
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BY[lp] = rnd() % txt.DEFAULT_HEIGHT
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BC[lp] = rnd() & 15
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DX[lp] = rnd() & 1
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DY[lp] = rnd() & 1
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}
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; display balls
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repeat {
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; Loop though all balls clearing current spot and setting new spot
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for lp in 0 to ballCount-1 {
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; Clear existing Location the ball is at
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txt.setclr(BX[lp], BY[lp], 0)
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if DX[lp] == 0 {
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if (BX[lp] == 0)
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DX[lp] = 1
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else
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BX[lp]=BX[lp]-1
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} else if DX[lp] == 1 {
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if (BX[lp] == txt.DEFAULT_WIDTH-1) {
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BX[lp] = txt.DEFAULT_WIDTH-2
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DX[lp] = 0
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} else {
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BX[lp]=BX[lp]+1
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}
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}
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if DY[lp] == 0 {
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if (BY[lp] == 0)
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DY[lp] = 1
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else
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BY[lp]=BY[lp]-1
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} else if DY[lp] == 1 {
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if (BY[lp] == txt.DEFAULT_HEIGHT-1) {
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BY[lp] = txt.DEFAULT_HEIGHT-2
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DY[lp] = 0
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} else {
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BY[lp]=BY[lp]+1
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}
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}
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; Put the new ball possition
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txt.setclr(BX[lp], BY[lp], BC[lp])
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}
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sys.waitvsync()
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}
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}
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}
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