mirror of
https://github.com/sehugg/8bitworkshop.git
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46 lines
986 B
QBasic
46 lines
986 B
QBasic
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' P/M test program
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graphics 0 ' Setups graphics mode
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pmgraphics 2 ' And P/M mode
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P0Mem = pmadr(0) ' Get player 0 address
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oldPos = P0Mem ' and into "old position"
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mset P0Mem, 128, 0 ' Clears P/M 0 Memory
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setcolor -4, 1, 15
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' P/M data and blank (to clear P/M)
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DATA PMdata() byte = $38,$44,$54,$44,$38
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' Initial Conditions
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xPos = 6400 : yPos = 2560
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xSpd = 64 : ySpd = 0
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repeat
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xPos = xPos + xSpd : yPos = yPos + ySpd
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ySpd = ySpd + 2
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if (ySpd > 0) and (yPos > 12800)
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ySpd = -ySpd
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xSpd = Rand(512) - 256
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endif
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if xSpd > 0
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if xPos > 25600 Then xSpd = -xSpd
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else
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if xPos < 6400 Then xSpd = -xSpd
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endif
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exec MovePm ' Move P/M Graphics
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until Key()
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graphics 0
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END
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proc MovePm
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x = xPos / 128 : y = P0Mem + yPos / 128
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poke $D01A,$74 ' Change background color
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pause 0
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pmhpos 0, x ' Set new horizontal position
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mset oldPos, 5, 0 ' Clear old sprite
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move adr(PMdata), y, 5 ' Draw at new vertical pos.
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oldPos = y
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endproc
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