@cobinhood/react-native-canvas/dist/autoscale-canvas.js

<div align="center"> <img src="https://emojipedia-us.s3.amazonaws.com/thumbs/240/apple/96/fireworks_1f386.png"/> <h1>react-native-canvas</h1> </div>

var scale = function scale(ratio) {
  return function (item) {
    if (typeof item === 'number') {
      return item * ratio;
    }
    return item;
  };
};

window.autoScaleCanvas = function autoScaleCanvas(canvas) {
  var ctx = canvas.getContext('2d');
  var ratio = window.devicePixelRatio || 1;
  if (ratio !== 1) {
    var width = canvas.layoutWidth || canvas.width;
    var height = canvas.layoutHeight || canvas.height;
    canvas.style.width = width + 'px';
    canvas.style.height = height + 'px';
    canvas.width = width * ratio;
    canvas.height = height * ratio;
    ctx.scale(ratio, ratio);
    ctx.isPointInPath = function () {
      for (var _len = arguments.length, args = Array(_len), _key = 0; _key < _len; _key++) {
        args[_key] = arguments[_key];
      }

      return CanvasRenderingContext2D.prototype.isPointInPath.apply(ctx, args.map(scale(ratio)));
    };
  }
  return canvas;
};