pnpm add @panscale/core transformation-matrix

import { Scaler } from "@panscale/core";

const scaler = new Scaler((values) => {
  console.log("scroll:", values.scrollLeft, values.scrollTop);
  console.log("zoom:", values.zoom);
});

scaler.setDimensions(800, 600, 2000, 1500);

// Programmatic scroll
scaler.scrollTo(100, 50, true);

// Programmatic zoom
scaler.zoomTo(1.5, true, 400, 300);

scaler.doTouchStart([{ pageX: 100, pageY: 200 }], Date.now());
scaler.doTouchMove([{ pageX: 120, pageY: 210 }], Date.now());
scaler.doTouchEnd(Date.now());