mirror of
https://github.com/irmen/prog8.git
synced 2024-09-30 15:57:06 +00:00
57 lines
1.0 KiB
Lua
57 lines
1.0 KiB
Lua
%import c64lib
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%import c64utils
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%import c64flt
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%zeropage basicsafe
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main {
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sub start() {
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line(1111,22,3333,22)
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line(1111,22,1111,22)
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line(1111,22,666,22)
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line(1111,22,1111,33)
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line(1111,22,1111,22)
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line(1111,22,1111,11)
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}
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sub line(uword x1, ubyte y1, uword x2, ubyte y2) {
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word dx
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word dy
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byte ix = 1
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byte iy = 1
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if x2>x1 {
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dx = x2-x1 as word
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} else {
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ix = -1
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dx = x1-x2 as word
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}
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if y2>y1 {
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dy = y2-y1
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} else {
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iy = -1
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dy = y1-y2
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}
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word dx2 = 2 * dx
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word dy2 = 2 * dy
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word d = 0
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plotx = x1
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c64scr.print("dx=")
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c64scr.print_w(dx)
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c64scr.print(" ix=")
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c64scr.print_b(ix)
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c64.CHROUT('\n')
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c64scr.print("dy=")
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c64scr.print_w(dy)
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c64scr.print(" iy=")
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c64scr.print_b(iy)
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c64.CHROUT('\n')
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}
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uword plotx
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}
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