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67 lines
2.0 KiB
Plaintext
67 lines
2.0 KiB
Plaintext
Re-implementation of the Print Shop "Thinking / Printing" animated banner.
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Was struggling to get this to fit in 141 bytes for the Apple II Basic Bot.
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Managed in the end to get a version that had animated bars instead of boxes.
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****************
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"Proper" Version
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****************
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See the thinking_flip.s / THINKING_FLIP code.
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This draws offscreen. First the boxes, cascading inward,
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(using direct RAM writes to draw the boxes).
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A separate loop then overwrites with the bitmap.
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Page flipping is used, so it alternates PAGE1/PAGE2.
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The code is callable as a function so you can add hooks into
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it from existing code as a progress indicator.
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Downsides: lots of over-writing (speed), also you need to
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have the 1k of RAM at $800 free for PAGE2 use.
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Total size approaches 256 bytes
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**************
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Other attempts
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**************
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Various other attempts tried:
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+ Drawing the boxes using Applesoft/Monitor ROM routines for a box
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(4 sides), then drawing the bitmap on top.
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This is too slow and makes flicker, also the code is large.
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(some preliminary attempt to this is in THINKING_ATTEMPT4)
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+ Drawing the boxes using HLINE instead of direct mem writes.
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Slower, so very noticable that you're drawing things.
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Still couldn't get below 153 bytes.
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See thinking_slow.s / THINKING_SLOW
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+ Using box drawing code from my various box-drawing demos.
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This ends up being too large
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+ RLE encoding the image. Too big
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+ Looking for the color progression in ROM (Didn't have to be exact,
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just low bytes the same). Sadly not there
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+ Drawing the boxes/text offscreen and basically do a palette-shifting
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type thing. This is possible (though tricky as there are 10
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boxes but only 8 colors so it's not a straight up palette shift).
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This has the same limitations that page-flipping does in that
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you need an offscreen area.
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See t3.s / T3 for implementation. Still large (192 bytes)
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+ BOT version
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Fits in 141 bytes.
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See thinking_bot.s THINKING_BOT
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Only draws lines that rotate, not boxes.
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Draws bitmap at same time as drawing lines, meaning there is no
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overdraw so no flicker.
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