Moved from private git forge to gitlab

src/utils/interaction.ts

@@ -0,0 +1,24 @@
+import { ViewportOffset, CONSTANTS } from '../types';
+import { clamp, calculateDistance } from './math';
+
+// Zoom-related functions
+export const calculateZoomDelta = (
+  wheelDelta: number,
+  accelerationFactor: number,
+  baseMultiplier = 0.001
+): number => clamp(wheelDelta * baseMultiplier * accelerationFactor, -0.5, 0.5);
+
+export const calculateInitialViewport = (initialZoom: number): ViewportOffset => ({
+  x: (CONSTANTS.VIRTUAL_CANVAS_SIZE - window.innerWidth / initialZoom) / 2,
+  y: (CONSTANTS.VIRTUAL_CANVAS_SIZE - window.innerHeight / initialZoom) / 2,
+});
+
+export const clampZoom = (zoom: number): number => 
+  clamp(zoom, CONSTANTS.ZOOM_LEVELS.min, CONSTANTS.ZOOM_LEVELS.max);
+
+// Touch-related functions
+export const calculateTouchDistance = (touch1: React.Touch | Touch, touch2: React.Touch | Touch): number =>
+  calculateDistance(touch1.clientX, touch1.clientY, touch2.clientX, touch2.clientY);
+
+export const calculateZoomFactor = (currentDistance: number, startDistance: number): number =>
+  startDistance > 0 ? currentDistance / startDistance : 1;