1f4c460f4f
Add GitHub Actions CI with automated build and test. Implement real terminal I/O with raw mode (enable_raw/disable_raw, proper INKEY$ polling via VMIN=0/VTIME=0, INPUT$ function). Add Sixel graphics engine with virtual framebuffer (SCREEN 1: 320x200, SCREEN 2: 640x200), Bresenham line drawing, midpoint circle, flood fill PAINT, DRAW mini-language parser, and Sixel encoder with RLE. Replace all graphics stubs with real implementations (PSET, LINE, CIRCLE, DRAW, PAINT, COLOR, SCREEN, POINT). Fix AND/OR/XOR operator precedence to be lower than relational operators. Add 13 classic test programs (39 total). Bump version to 0.5.0.
12 lines
285 B
QBasic
12 lines
285 B
QBasic
10 REM Diamond pattern using STRING$ and SPACE$
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20 N% = 7
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30 REM Top half
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40 FOR I = 1 TO N%
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50 PRINT SPACE$(N% - I); STRING$(2 * I - 1, "*")
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60 NEXT I
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70 REM Bottom half
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80 FOR I = N% - 1 TO 1 STEP -1
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90 PRINT SPACE$(N% - I); STRING$(2 * I - 1, "*")
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100 NEXT I
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110 PRINT "Diamond OK"
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