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🐛 fix zoom-to-mouse: capture worldX/Y before setZoom

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tekki mariani
2026-03-20 20:39:53 +00:00
parent fb4abb7256
commit d354a26a80
1 changed files with 4 additions and 2 deletions
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6
src/systems/CameraSystem.ts
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@@ -66,9 +66,11 @@ export class CameraSystem {
this.scene.input.on('wheel', (ptr: Phaser.Input.Pointer, _objs: unknown, _dx: number, dy: number) => { this.scene.input.on('wheel', (ptr: Phaser.Input.Pointer, _objs: unknown, _dx: number, dy: number) => {
const newZoom = Phaser.Math.Clamp(cam.zoom - Math.sign(dy) * ZOOM_STEP, MIN_ZOOM, MAX_ZOOM) const newZoom = Phaser.Math.Clamp(cam.zoom - Math.sign(dy) * ZOOM_STEP, MIN_ZOOM, MAX_ZOOM)
if (newZoom === cam.zoom) return if (newZoom === cam.zoom) return
const worldX = ptr.worldX // capture BEFORE zoom changes the value
const worldY = ptr.worldY
cam.setZoom(newZoom) cam.setZoom(newZoom)
cam.scrollX = ptr.worldX - ptr.x / newZoom cam.scrollX = worldX - ptr.x / newZoom
cam.scrollY = ptr.worldY - ptr.y / newZoom cam.scrollY = worldY - ptr.y / newZoom
const centerX = cam.scrollX + cam.width / (2 * cam.zoom) const centerX = cam.scrollX + cam.width / (2 * cam.zoom)
const centerY = cam.scrollY + cam.height / (2 * cam.zoom) const centerY = cam.scrollY + cam.height / (2 * cam.zoom)
console.log(`[zoom] ptr=(${ptr.x.toFixed(0)},${ptr.y.toFixed(0)}) world=(${ptr.worldX.toFixed(0)},${ptr.worldY.toFixed(0)}) center=(${centerX.toFixed(0)},${centerY.toFixed(0)}) zoom=${cam.zoom.toFixed(2)}`) console.log(`[zoom] ptr=(${ptr.x.toFixed(0)},${ptr.y.toFixed(0)}) world=(${ptr.worldX.toFixed(0)},${ptr.worldY.toFixed(0)}) center=(${centerX.toFixed(0)},${centerY.toFixed(0)}) zoom=${cam.zoom.toFixed(2)}`)