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fix: match object rotation to cell canvas rotation in dungeons

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Two issues caused objects to float relative to dungeon map:
1. rotAngle used (heading + PI) but canvas uses (PI - heading)
   - these differ: sin(x+PI) = -sin(x) vs sin(PI-x) = sin(x)
2. Object dy was negated, but 180° heading offset already handles N/S
   - double N/S flip caused objects to drift with heading changes

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
Erik 2026-04-08 16:24:06 +02:00
parent 6c500f7cdb
commit 8432c5f7c3
1 changed files with 5 additions and 3 deletions
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8
static/script.js
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@ -3969,8 +3969,8 @@ function updateRadarWindow(msg) {
ctx.stroke();
// Rotate world by heading so player facing = up on canvas
// In dungeons, add 180° to match UB's (heading - 180) rotation
const rotAngle = isDungeon ? headingRad + Math.PI : headingRad;
// In dungeons, use (PI - heading) to match UB's canvas rotation
const rotAngle = isDungeon ? (Math.PI - headingRad) : headingRad;
// Draw objects and cache positions for click hit-testing
const cosA = Math.cos(rotAngle);
@ -3987,7 +3987,9 @@ function updateRadarWindow(msg) {
}
const dx = dX * cosA - dY * sinA;
const dy = -(dX * sinA + dY * cosA);
// In dungeons, don't negate dy (180° heading offset handles N/S)
// In overworld, negate for north-up
const dy = isDungeon ? (dX * sinA + dY * cosA) : -(dX * sinA + dY * cosA);
const px = cx + dx * scale;
const py = cy + dy * scale;