[alecu]

Two follow-ups to the LD60 Circular Arcade games (after #181).

Either controller plays all five games

The games are one-player, but they only read joy1. Anyone holding the second controller, or using the WASD half of the emulator's keyboard, couldn't even get past the title screen. Each game now reads its stick and buttons through held()/pressed(), which accept either controller. That covers A on the title and end screens too. It's the same joy1 … or joy2 … pattern the dream garden demo uses.

The cameras follow a moment behind, as in the prototype

In the prototype you move at once and the view eases after you. Here the camera was pinned to the player.

• Around the disc (all five games): the prototype turns its view by a share of the gap that grows with the gap: 4% of it per hundredth of a turn, each 60 fps frame. A gap of a twentieth of a turn or more is jumped. The ports turn by 1/36 of the gap per column of it per 30 ms tick, which is the same speed. A moving player is drawn about 5 columns ahead of the top, a little more at full speed. When you stop, the view drifts back onto you.
• In and out (Spiral Tunnel, Catch the Robots, Rim Runner): these are the levels the prototype scrolls that way, because they're taller than its screen. Its scroll closes 7% of the gap each frame; the ports close 12% per tick. Dodge 'Em and Defender fit on screen in the prototype too, so they only lag around the disc.
• Dodge 'Em's crash explosion now stays where the crash happened instead of on a fixed spot on screen, since the camera keeps moving after the crash.

Tests

• Second controller: the headless test harness now has one. Each game is played twice from the same seed, once on each controller, and must end in exactly the same state. A from joy2 must also restart from the end screen. This test fails on the old code for all five games.
• Around the disc: every game must draw the player 3 to 12.8 columns ahead while going around. In the three where you can stop, the camera must come back onto the player afterwards. In Spiral Tunnel and Dodge 'Em, faster must mean further ahead. Those checks average over ten ticks, because the camera snaps to whole columns.
• In and out: Spiral Tunnel steering, running down the maze, and a Rim Runner jump each show the player drawn off its usual depth while the view catches up.
• Existing tests: the ones that moved the player instantly now wait for the camera to catch up.
• Suite and build: tests/run_tests.py passes and mpy-cross compiles all five games. The menu icons are unchanged.
• Web emulator: each game was played briefly. joy2 starts and restarts games, and nothing shows a MicroPython error.

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