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🐛 zoom-to-mouse: track world coords on pointermove, avoid ptr.worldX getter

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tekki mariani
2026-03-20 20:45:18 +00:00
parent d354a26a80
commit 6de4c1cbb9
1 changed files with 16 additions and 6 deletions
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22
src/systems/CameraSystem.ts
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@@ -26,6 +26,10 @@ export class CameraSystem {
private middlePanActive = false
private lastPanX = 0
private lastPanY = 0
private mouseScreenX = 0
private mouseScreenY = 0
private mouseWorldX = 0
private mouseWorldY = 0
private debugCross?: Phaser.GameObjects.Graphics
constructor(scene: Phaser.Scene, adapter: LocalAdapter) {
@@ -62,18 +66,24 @@ export class CameraSystem {
this.debugCross.lineBetween(cx - 12, cy, cx + 12, cy)
this.debugCross.lineBetween(cx, cy - 12, cx, cy + 12)
// Track mouse world position on every move so we have a stable value for zoom
this.scene.input.on('pointermove', (ptr: Phaser.Input.Pointer) => {
this.mouseScreenX = ptr.x
this.mouseScreenY = ptr.y
this.mouseWorldX = cam.scrollX + ptr.x / cam.zoom
this.mouseWorldY = cam.scrollY + ptr.y / cam.zoom
})
// Scroll wheel zoom — zoom toward mouse pointer
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)
if (newZoom === cam.zoom) return
const worldX = ptr.worldX // capture BEFORE zoom changes the value
const worldY = ptr.worldY
cam.setZoom(newZoom)
cam.scrollX = worldX - ptr.x / newZoom
cam.scrollY = worldY - ptr.y / newZoom
cam.scrollX = this.mouseWorldX - this.mouseScreenX / newZoom
cam.scrollY = this.mouseWorldY - this.mouseScreenY / newZoom
const centerX = cam.scrollX + cam.width / (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=${cam.zoom.toFixed(2)}`)
console.log(`[zoom] screen=(${this.mouseScreenX.toFixed(0)},${this.mouseScreenY.toFixed(0)}) world=(${this.mouseWorldX.toFixed(0)},${this.mouseWorldY.toFixed(0)}) center=(${centerX.toFixed(0)},${centerY.toFixed(0)}) zoom=${cam.zoom.toFixed(2)}`)
})
// Middle-click pan: start on button down