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

A Canvas component for React Native

var scale = function (ratio) {
    return function (item) {
        if (typeof item === "number") {
            return item * ratio;
        }
        return item;
    };
};
/**
 * Extracted from https://github.com/component/autoscale-canvas
 * @param {Canvas} canvas
 * @return {Canvas}
 */
function autoScaleCanvas(canvas) {
    var ctx = canvas.getContext("2d");
    var ratio = window.devicePixelRatio || 1;
    if (ratio !== 1) {
        canvas.style.width = canvas.width + "px";
        canvas.style.height = canvas.height + "px";
        canvas.width *= ratio;
        canvas.height *= ratio;
        ctx.scale(ratio, ratio);
        ctx.isPointInPath = function () {
            var args = [];
            for (var _i = 0; _i < arguments.length; _i++) {
                args[_i] = arguments[_i];
            }
            return CanvasRenderingContext2D.prototype.isPointInPath.apply(ctx, args.map(scale(ratio)));
        };
    }
    return canvas;
}
window.autoScaleCanvas = autoScaleCanvas;