@devexperts/dxcharts-lite
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JavaScript
/*
* Copyright (C) 2019 - 2025 Devexperts Solutions IE Limited
* This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
* If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
import { ceil, floor, round } from '../math.utils';
export let dpr = window.devicePixelRatio;
// A media matcher which watches for changes in the device pixel ratio.
let mediaMatcher = window.matchMedia(`screen and (resolution: ${window.devicePixelRatio}dppx)`);
const updateDevicePixelRatio = () => {
mediaMatcher.removeEventListener('change', updateDevicePixelRatio);
dpr = window.devicePixelRatio;
mediaMatcher = window.matchMedia(`screen and (resolution: ${window.devicePixelRatio}dppx)`);
mediaMatcher.addEventListener('change', updateDevicePixelRatio);
};
mediaMatcher.addEventListener('change', updateDevicePixelRatio);
export const getDPR = () => dpr;
/**
* Rounds a given number according to the inverse of current DPR.
* For example, DPR = 2, num = 2, res => 2; DPR = 2, num = 2.5, res => 2.5; DPR = 2, num = 2.333, res => 2.5
* @param num
* @doc-tags chart-core,math,dpr
*/
export const roundToDPR = (num) => round(dpr * num) / dpr;
export const floorToDPR = (num) => floor(dpr * num) / dpr;
export const ceilToDPR = (num) => ceil(dpr * num) / dpr;