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Renumber chapters 15 to 21 up by one, to open a slot for collision

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A pure rename plus link rewrite and nothing else. Collision is a pluggable
subsystem with two implementations, shapes, a response hook and a tile binding;
that is a chapter, and burying it inside the physics chapter is the shape this
manual otherwise avoids -- rendering and drawing are 8 and 9, spritesheets and
characters and actors are 10, 11 and 12.

Kept separate from writing the chapter because **nothing validates a
cross-reference target.** The example harness reads fenced blocks; it does not
follow links. A rename mixed into five hundred lines of new prose is not
reviewable, and a broken link would land silently. As its own commit it is
reviewable as a rename, and a grep for dangling `](NN-` targets is clean.

Co-Authored-By: Claude Code <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Andrew Kesterson
2026-08-02 07:15:25 -04:00
parent fcad2822a9
commit bace818998
19 changed files with 49 additions and 49 deletions
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docs/14-physics.md
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@@ -333,8 +333,8 @@ contract is "nothing collides", which is an answer. The arcade one means "nobody
written this yet", and a caller who reaches it should find out.
Until it exists, collision belongs in your `movementlogicfunc`, as in the example above.
The sidescroller tutorial in [Chapter 19](19-tutorial-sidescroller.md) does exactly that and
says why. `akgl_collide_*` in [Chapter 18](18-utilities.md) gives you the rectangle tests.
The sidescroller tutorial in [Chapter 20](20-tutorial-sidescroller.md) does exactly that and
says why. `akgl_collide_*` in [Chapter 19](19-utilities.md) gives you the rectangle tests.
### Four gaps in the feel