wx-qr/dist/util.js

微信小程序生成二维码组件，支持图标、底色、dotScale等各种配置

export const COMPONENT_NAME = "wx-qr";
export const DEFAULT_SIZE = "200rpx";
const screenWidth = wx.getSystemInfoSync()['screenWidth'];
export function getPxFromRpx(rpx) {
    return Math.round(rpx * screenWidth / 750);
}
export function getRpxFromPx(px) {
    return Math.round(px * 750 / screenWidth);
}
export function loadImage(canvas, imgSrc) {
    return new Promise((reslove, reject) => {
        const img = canvas.createImage();
        img.src = imgSrc;
        img.onload = () => {
            reslove(img);
        };
        img.onerror = (e) => {
            reject(e);
        };
    });
}
export function resetCanvasHeighAndWidth(canvas, size, scale) {
    const ctx = canvas.getContext('2d');
    let dpr = wx.getSystemInfoSync().pixelRatio;
    if (scale) {
        dpr = scale;
    }
    canvas.width = size * dpr;
    canvas.height = size * dpr;
    ctx.scale(dpr, dpr);
    return canvas;
}
export function getRoundNum(num, fixedNum = 0) {
    return Number(num.toFixed(fixedNum));
}
export function getPxFromStringOrNumber(pixel) {
    let px = 0;
    if (!pixel) {
        return px;
    }
    if (typeof pixel !== 'string') {
        return getPxFromRpx(pixel);
    }
    px = Number(pixel.match(/\d+\.?\d+?/)[0]);
    if (pixel.endsWith('px')) {
        return px;
    }
    else {
        return getPxFromRpx(px);
    }
}
export function getRpxFromStringOrNumber(rpx) {
    let px = 0;
    if (!rpx) {
        return px;
    }
    if (typeof rpx === 'number') {
        return rpx;
    }
    px = Number(rpx.match(/\d+\.?\d+?/)[0]);
    if (rpx.endsWith('px')) {
        return getRpxFromPx(px);
    }
    else {
        return px;
    }
}