import analyser and migrate to solidjs, untested

script/viewer/Panner/Viewport.ts

@@ -0,0 +1,36 @@
+export interface ViewPortOptions {
+	x?: number;
+	y?: number;
+	width: number;
+	height: number;
+}
+
+export interface Point {
+	x: number;
+	y: number;
+}
+
+export class Viewport {
+	x: number;
+	y: number;
+	width: number;
+	height: number;
+
+	constructor(options: ViewPortOptions) {
+		this.x = options.x || 0;
+		this.y = options.y || 0;
+		this.width = options.width;
+		this.height = options.height;
+	}
+
+	static convert(point: Point, {from, to}: {from: Viewport, to: Viewport}): Point {
+		const widthScale = from.width / to.width;
+		const heightScale = from.height / to.height;
+
+		return {
+			x: point.x * widthScale - to.x * widthScale,
+			y: point.y * heightScale - to.y * heightScale
+		};
+	}
+}
+