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Fix EPC symbol jump on mouseup: preserve rotation center when updating bounds

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recalcEpcBounds now properly normalizes the bounding box to start at
(0,0) in local space, adjusting sym.x/y to compensate so the world
position and rotation center stay constant. Handles rotated symbols
by rotating the center offset into world space.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
This commit is contained in:
igurielidze 2026-03-30 15:18:54 +04:00
parent eb4a570a70
commit c3da2da20d
1 changed files with 31 additions and 3 deletions
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34
svelte-app/src/lib/canvas/interactions.ts
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@ -370,9 +370,37 @@ function recalcEpcBounds(sym: typeof layout.symbols[0]) {
// Add small padding
minX -= 1; minY -= 1; maxX += 1; maxY += 1;
// Set w/h to cover full extent from origin (allow negative local coords)
sym.w = Math.max(maxX, 1);
sym.h = Math.max(maxY, 1);
const newW = Math.max(maxX - minX, 1);
const newH = Math.max(maxY - minY, 1);
// Compute old and new rotation centers (local space)
const oldCx = sym.w / 2;
const oldCy = sym.h / 2;
const newCx = minX + newW / 2;
const newCy = minY + newH / 2;
// Shift origin so the rotation center stays at the same world position.
// For rotated symbols, the center offset must be rotated into world space.
const dCx = newCx - oldCx;
const dCy = newCy - oldCy;
if (sym.rotation) {
const rad = (sym.rotation * Math.PI) / 180;
const cos = Math.cos(rad), sin = Math.sin(rad);
sym.x += cos * dCx - sin * dCy;
sym.y += sin * dCx + cos * dCy;
} else {
sym.x += dCx;
sym.y += dCy;
}
// Adjust waypoints so their local coords are relative to the new origin
for (const wp of wps) {
wp.x -= minX;
wp.y -= minY;
}
sym.w = newW;
sym.h = newH;
}
function snapWidth(w: number, ctrlKey: boolean, minW: number = CONVEYOR_MIN_W): number {