549 lines
18 KiB
JavaScript
549 lines
18 KiB
JavaScript
const QR = require('./qrcode.js');
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const GD = require('./gradient.js');
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export default class Painter {
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constructor(ctx, data) {
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this.ctx = ctx;
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this.data = data;
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this.globalWidth = {};
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this.globalHeight = {};
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}
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paint(callback) {
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this.style = {
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width: this.data.width.toPx(),
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height: this.data.height.toPx(),
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};
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this._background();
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for (const view of this.data.views) {
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this._drawAbsolute(view);
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}
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this.ctx.draw(false, () => {
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callback();
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});
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}
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_background() {
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this.ctx.save();
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const {
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width,
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height,
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} = this.style;
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const bg = this.data.background;
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this.ctx.translate(width / 2, height / 2);
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this._doClip(this.data.borderRadius, width, height);
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if (!bg) {
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// 如果未设置背景，则默认使用白色
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this.ctx.fillStyle = '#fff';
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this.ctx.fillRect(-(width / 2), -(height / 2), width, height);
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} else if (bg.startsWith('#') || bg.startsWith('rgba') || bg.toLowerCase() === 'transparent') {
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// 背景填充颜色
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this.ctx.fillStyle = bg;
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this.ctx.fillRect(-(width / 2), -(height / 2), width, height);
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} else if (GD.api.isGradient(bg)) {
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GD.api.doGradient(bg, width, height, this.ctx);
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this.ctx.fillRect(-(width / 2), -(height / 2), width, height);
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} else {
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// 背景填充图片
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this.ctx.drawImage(bg, -(width / 2), -(height / 2), width, height);
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}
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this.ctx.restore();
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}
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_drawAbsolute(view) {
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// 证明 css 为数组形式，需要合并
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if (view.css && view.css.length) {
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/* eslint-disable no-param-reassign */
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view.css = Object.assign(...view.css);
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}
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switch (view.type) {
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case 'image':
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this._drawAbsImage(view);
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break;
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case 'text':
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this._fillAbsText(view);
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break;
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case 'rect':
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this._drawAbsRect(view);
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break;
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case 'qrcode':
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this._drawQRCode(view);
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break;
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default:
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break;
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}
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}
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/**
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* 根据 borderRadius 进行裁减
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*/
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_doClip(borderRadius, width, height) {
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if (borderRadius && width && height) {
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const r = Math.min(borderRadius.toPx(), width / 2, height / 2);
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// 防止在某些机型上周边有黑框现象，此处如果直接设置 fillStyle 为透明，在 Android 机型上会导致被裁减的图片也变为透明， iOS 和 IDE 上不会
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// globalAlpha 在 1.9.90 起支持，低版本下无效，但把 fillStyle 设为了 white，相对默认的 black 要好点
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this.ctx.globalAlpha = 0;
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this.ctx.fillStyle = 'white';
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this.ctx.beginPath();
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this.ctx.arc(-width / 2 + r, -height / 2 + r, r, 1 * Math.PI, 1.5 * Math.PI);
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this.ctx.lineTo(width / 2 - r, -height / 2);
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this.ctx.arc(width / 2 - r, -height / 2 + r, r, 1.5 * Math.PI, 2 * Math.PI);
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this.ctx.lineTo(width / 2, height / 2 - r);
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this.ctx.arc(width / 2 - r, height / 2 - r, r, 0, 0.5 * Math.PI);
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this.ctx.lineTo(-width / 2 + r, height / 2);
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this.ctx.arc(-width / 2 + r, height / 2 - r, r, 0.5 * Math.PI, 1 * Math.PI);
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this.ctx.closePath();
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this.ctx.fill();
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// 在 ios 的 6.6.6 版本上 clip 有 bug，禁掉此类型上的 clip，也就意味着，在此版本微信的 ios 设备下无法使用 border 属性
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if (!(getApp().systemInfo &&
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getApp().systemInfo.version <= '6.6.6' &&
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getApp().systemInfo.platform === 'ios')) {
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this.ctx.clip();
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}
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this.ctx.globalAlpha = 1;
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}
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}
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/**
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* 画边框
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*/
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_doBorder(view, width, height) {
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if (!view.css) {
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return;
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}
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const {
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borderRadius,
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borderWidth,
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borderColor,
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} = view.css;
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if (!borderWidth) {
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return;
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}
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this.ctx.save();
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this._preProcess(view, true);
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let r;
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if (borderRadius) {
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r = Math.min(borderRadius.toPx(), width / 2, height / 2);
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} else {
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r = 0;
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}
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const lineWidth = borderWidth.toPx();
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this.ctx.lineWidth = lineWidth;
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this.ctx.strokeStyle = (borderColor || 'black');
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this.ctx.beginPath();
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this.ctx.arc(-width / 2 + r, -height / 2 + r, r + lineWidth / 2, 1 * Math.PI, 1.5 * Math.PI);
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this.ctx.lineTo(width / 2 - r, -height / 2 - lineWidth / 2);
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this.ctx.arc(width / 2 - r, -height / 2 + r, r + lineWidth / 2, 1.5 * Math.PI, 2 * Math.PI);
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this.ctx.lineTo(width / 2 + lineWidth / 2, height / 2 - r);
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this.ctx.arc(width / 2 - r, height / 2 - r, r + lineWidth / 2, 0, 0.5 * Math.PI);
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this.ctx.lineTo(-width / 2 + r, height / 2 + lineWidth / 2);
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this.ctx.arc(-width / 2 + r, height / 2 - r, r + lineWidth / 2, 0.5 * Math.PI, 1 * Math.PI);
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this.ctx.closePath();
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this.ctx.stroke();
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this.ctx.restore();
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}
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_preProcess(view, notClip) {
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let width = 0;
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let height;
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let extra;
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switch (view.type) {
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case 'text': {
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const textArray = view.text.split('\n');
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// 处理多个连续的'\n'
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for (let i = 0; i < textArray.length; ++i) {
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if (textArray[i] === '') {
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textArray[i] = ' ';
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}
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}
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const fontWeight = view.css.fontWeight === 'bold' ? 'bold' : 'normal';
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view.css.fontSize = view.css.fontSize ? view.css.fontSize : '20rpx';
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this.ctx.font = `normal ${fontWeight} ${view.css.fontSize.toPx()}px ${view.css.fontFamily ? view.css.fontFamily : 'sans-serif'}`;
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// this.ctx.setFontSize(view.css.fontSize.toPx());
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// 计算行数
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let lines = 0;
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const linesArray = [];
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for (let i = 0; i < textArray.length; ++i) {
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const textLength = this.ctx.measureText(textArray[i]).width;
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const partWidth = view.css.width ? view.css.width.toPx() : textLength;
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const calLines = Math.ceil(textLength / partWidth);
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width = partWidth > width ? partWidth : width;
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lines += calLines;
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linesArray[i] = calLines;
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}
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lines = view.css.maxLines < lines ? view.css.maxLines : lines;
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const lineHeight = view.css.lineHeight ? view.css.lineHeight.toPx() : view.css.fontSize.toPx();
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height = lineHeight * lines;
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extra = {
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lines: lines,
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lineHeight: lineHeight,
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textArray: textArray,
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linesArray: linesArray,
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};
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break;
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}
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case 'image': {
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// image的长宽设置成auto的逻辑处理
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const ratio = getApp().systemInfo.pixelRatio ? getApp().systemInfo.pixelRatio : 2;
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// 有css却未设置width或height，则默认为auto
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if (view.css) {
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if (!view.css.width) {
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view.css.width = 'auto';
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}
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if (!view.css.height) {
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view.css.height = 'auto';
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}
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}
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if (!view.css || (view.css.width === 'auto' && view.css.height === 'auto')) {
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width = Math.round(view.sWidth / ratio);
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height = Math.round(view.sHeight / ratio);
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} else if (view.css.width === 'auto') {
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height = view.css.height.toPx();
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width = view.sWidth / view.sHeight * height;
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} else if (view.css.height === 'auto') {
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width = view.css.width.toPx();
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height = view.sHeight / view.sWidth * width;
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} else {
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width = view.css.width.toPx();
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height = view.css.height.toPx();
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}
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break;
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}
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default:
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if (!(view.css.width && view.css.height)) {
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console.error('You should set width and height');
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return;
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}
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width = view.css.width.toPx();
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height = view.css.height.toPx();
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break;
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}
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let x;
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if (view.css && view.css.right) {
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if (typeof view.css.right === 'string') {
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x = this.style.width - view.css.right.toPx(true);
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} else {
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// 可以用数组方式，把文字长度计算进去
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// [right, 文字id, 乘数（默认 1）]
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const rights = view.css.right;
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x = this.style.width - rights[0].toPx(true) - this.globalWidth[rights[1]] * (rights[2] || 1);
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}
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} else if (view.css && view.css.left) {
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if (typeof view.css.left === 'string') {
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x = view.css.left.toPx(true);
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} else {
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const lefts = view.css.left;
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x = lefts[0].toPx(true) + this.globalWidth[lefts[1]] * (lefts[2] || 1);
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}
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} else {
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x = 0;
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}
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//const y = view.css && view.css.bottom ? this.style.height - height - view.css.bottom.toPx(true) : (view.css && view.css.top ? view.css.top.toPx(true) : 0);
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let y;
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if (view.css && view.css.bottom) {
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y = this.style.height - height - view.css.bottom.toPx(true);
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} else {
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if (view.css && view.css.top) {
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if (typeof view.css.top === 'string') {
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y = view.css.top.toPx(true);
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} else {
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const tops = view.css.top;
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y = tops[0].toPx(true) + this.globalHeight[tops[1]] * (tops[2] || 1);
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}
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} else {
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y = 0
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}
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}
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const angle = view.css && view.css.rotate ? this._getAngle(view.css.rotate) : 0;
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// 当设置了 right 时，默认 align 用 right，反之用 left
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const align = view.css && view.css.align ? view.css.align : (view.css && view.css.right ? 'right' : 'left');
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switch (align) {
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case 'center':
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this.ctx.translate(x, y + height / 2);
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break;
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case 'right':
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this.ctx.translate(x - width / 2, y + height / 2);
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break;
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default:
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this.ctx.translate(x + width / 2, y + height / 2);
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break;
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}
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this.ctx.rotate(angle);
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if (!notClip && view.css && view.css.borderRadius && view.type !== 'rect') {
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this._doClip(view.css.borderRadius, width, height);
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}
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this._doShadow(view);
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if (view.id) {
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this.globalWidth[view.id] = width;
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this.globalHeight[view.id] = height;
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}
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return {
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width: width,
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height: height,
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x: x,
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y: y,
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extra: extra,
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};
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}
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// 画文字的背景图片
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_doBackground(view) {
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this.ctx.save();
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const {
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width: rawWidth,
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height: rawHeight,
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} = this._preProcess(view, true);
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const {
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background,
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padding,
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} = view.css;
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let pd = [0, 0, 0, 0];
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if (padding) {
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const pdg = padding.split(/\s+/);
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if (pdg.length === 1) {
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const x = pdg[0].toPx();
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pd = [x, x, x, x];
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}
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if (pdg.length === 2) {
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const x = pdg[0].toPx();
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const y = pdg[1].toPx();
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pd = [x, y, x, y];
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}
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if (pdg.length === 3) {
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const x = pdg[0].toPx();
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const y = pdg[1].toPx();
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const z = pdg[2].toPx();
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pd = [x, y, z, y];
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}
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if (pdg.length === 4) {
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const x = pdg[0].toPx();
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const y = pdg[1].toPx();
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const z = pdg[2].toPx();
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const a = pdg[3].toPx();
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pd = [x, y, z, a];
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}
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}
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const width = rawWidth + pd[1] + pd[3];
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const height = rawHeight + pd[0] + pd[2];
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this._doClip(view.css.borderRadius, width, height)
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if (GD.api.isGradient(background)) {
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GD.api.doGradient(background, width, height, this.ctx);
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} else {
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this.ctx.fillStyle = background;
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}
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this.ctx.fillRect(-(width / 2), -(height / 2), width, height);
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this.ctx.restore();
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}
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_drawQRCode(view) {
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this.ctx.save();
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const {
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width,
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height,
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} = this._preProcess(view);
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QR.api.draw(view.content, this.ctx, -width / 2, -height / 2, width, height, view.css.background, view.css.color);
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this.ctx.restore();
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this._doBorder(view, width, height);
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}
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_drawAbsImage(view) {
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if (!view.url) {
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return;
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}
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this.ctx.save();
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const {
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width,
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height,
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} = this._preProcess(view);
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// 获得缩放到图片大小级别的裁减框
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let rWidth = view.sWidth;
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let rHeight = view.sHeight;
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let startX = 0;
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let startY = 0;
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// 绘画区域比例
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const cp = width / height;
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// 原图比例
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const op = view.sWidth / view.sHeight;
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if (cp >= op) {
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rHeight = rWidth / cp;
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startY = Math.round((view.sHeight - rHeight) / 2);
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} else {
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rWidth = rHeight * cp;
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startX = Math.round((view.sWidth - rWidth) / 2);
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}
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if (view.css && view.css.mode === 'scaleToFill') {
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this.ctx.drawImage(view.url, -(width / 2), -(height / 2), width, height);
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} else {
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this.ctx.drawImage(view.url, startX, startY, rWidth, rHeight, -(width / 2), -(height / 2), width, height);
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}
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this.ctx.restore();
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this._doBorder(view, width, height);
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}
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_fillAbsText(view) {
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if (!view.text) {
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return;
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}
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if (view.css.background) {
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// 生成背景
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this._doBackground(view);
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}
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this.ctx.save();
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const {
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width,
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height,
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extra,
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} = this._preProcess(view, view.css.background && view.css.borderRadius);
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this.ctx.fillStyle = (view.css.color || 'black');
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const {
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lines,
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lineHeight,
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textArray,
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linesArray,
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} = extra;
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// 如果设置了id，则保留 text 的长度
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if (view.id) {
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let textWidth = 0;
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for (let i = 0; i < textArray.length; ++i) {
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textWidth = this.ctx.measureText(textArray[i]).width > textWidth ? this.ctx.measureText(textArray[i]).width : textWidth;
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}
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this.globalWidth[view.id] = width ? (textWidth < width ? textWidth : width) : textWidth;
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}
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let lineIndex = 0;
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for (let j = 0; j < textArray.length; ++j) {
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const preLineLength = Math.round(textArray[j].length / linesArray[j]);
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let start = 0;
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let alreadyCount = 0;
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for (let i = 0; i < linesArray[j]; ++i) {
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// 绘制行数大于最大行数，则直接跳出循环
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if (lineIndex >= lines) {
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break;
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}
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alreadyCount = preLineLength;
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let text = textArray[j].substr(start, alreadyCount);
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let measuredWith = this.ctx.measureText(text).width;
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// 如果测量大小小于width一个字符的大小，则进行补齐，如果测量大小超出 width，则进行减除
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// 如果已经到文本末尾，也不要进行该循环
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while ((start + alreadyCount <= textArray[j].length) && (width - measuredWith > view.css.fontSize.toPx() || measuredWith > width)) {
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if (measuredWith < width) {
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text = textArray[j].substr(start, ++alreadyCount);
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} else {
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if (text.length <= 1) {
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// 如果只有一个字符时，直接跳出循环
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break;
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}
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text = textArray[j].substr(start, --alreadyCount);
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}
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measuredWith = this.ctx.measureText(text).width;
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}
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start += text.length;
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// 如果是最后一行了，发现还有未绘制完的内容，则加...
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if (lineIndex === lines - 1 && (j < textArray.length - 1 || start < textArray[j].length)) {
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while (this.ctx.measureText(`${text}...`).width > width) {
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if (text.length <= 1) {
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// 如果只有一个字符时，直接跳出循环
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break;
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}
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text = text.substring(0, text.length - 1);
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}
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text += '...';
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measuredWith = this.ctx.measureText(text).width;
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}
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this.ctx.setTextAlign(view.css.textAlign ? view.css.textAlign : 'left');
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let x;
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switch (view.css.textAlign) {
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case 'center':
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x = 0;
|
||
break;
|
||
case 'right':
|
||
x = (width / 2);
|
||
break;
|
||
default:
|
||
x = -(width / 2);
|
||
break;
|
||
}
|
||
const y = -(height / 2) + (lineIndex === 0 ? view.css.fontSize.toPx() : (view.css.fontSize.toPx() + lineIndex * lineHeight));
|
||
lineIndex++;
|
||
if (view.css.textStyle === 'stroke') {
|
||
this.ctx.strokeText(text, x, y, measuredWith);
|
||
} else {
|
||
this.ctx.fillText(text, x, y, measuredWith);
|
||
}
|
||
const fontSize = view.css.fontSize.toPx();
|
||
if (view.css.textDecoration) {
|
||
this.ctx.beginPath();
|
||
if (/\bunderline\b/.test(view.css.textDecoration)) {
|
||
this.ctx.moveTo(x, y);
|
||
this.ctx.lineTo(x + measuredWith, y);
|
||
}
|
||
if (/\boverline\b/.test(view.css.textDecoration)) {
|
||
this.ctx.moveTo(x, y - fontSize);
|
||
this.ctx.lineTo(x + measuredWith, y - fontSize);
|
||
}
|
||
if (/\bline-through\b/.test(view.css.textDecoration)) {
|
||
this.ctx.moveTo(x, y - fontSize / 3);
|
||
this.ctx.lineTo(x + measuredWith, y - fontSize / 3);
|
||
}
|
||
this.ctx.closePath();
|
||
this.ctx.strokeStyle = view.css.color;
|
||
this.ctx.stroke();
|
||
}
|
||
}
|
||
}
|
||
this.ctx.restore();
|
||
this._doBorder(view, width, height);
|
||
}
|
||
|
||
_drawAbsRect(view) {
|
||
this.ctx.save();
|
||
const {
|
||
width,
|
||
height,
|
||
} = this._preProcess(view);
|
||
if (GD.api.isGradient(view.css.color)) {
|
||
GD.api.doGradient(view.css.color, width, height, this.ctx);
|
||
} else {
|
||
this.ctx.fillStyle = view.css.color;
|
||
}
|
||
const borderRadius = view.css.borderRadius
|
||
const r = borderRadius ? Math.min(borderRadius.toPx(), width / 2, height / 2) : 0;
|
||
this.ctx.beginPath();
|
||
this.ctx.arc(-width / 2 + r, -height / 2 + r, r, 1 * Math.PI, 1.5 * Math.PI); //左上角圆弧
|
||
this.ctx.lineTo(width / 2 - r, -height / 2);
|
||
this.ctx.arc(width / 2 - r, -height / 2 + r, r, 1.5 * Math.PI, 2 * Math.PI); // 右上角圆弧
|
||
this.ctx.lineTo(width / 2, height / 2 - r);
|
||
this.ctx.arc(width / 2 - r, height / 2 - r, r, 0, 0.5 * Math.PI); // 右下角圆弧
|
||
this.ctx.lineTo(-width / 2 + r, height / 2);
|
||
this.ctx.arc(-width / 2 + r, height / 2 - r, r, 0.5 * Math.PI, 1 * Math.PI); // 左下角圆弧
|
||
this.ctx.closePath();
|
||
this.ctx.fill();
|
||
this.ctx.restore();
|
||
this._doBorder(view, width, height);
|
||
}
|
||
|
||
// shadow 支持 (x, y, blur, color), 不支持 spread
|
||
// shadow:0px 0px 10px rgba(0,0,0,0.1);
|
||
_doShadow(view) {
|
||
if (!view.css || !view.css.shadow) {
|
||
return;
|
||
}
|
||
const box = view.css.shadow.replace(/,\s+/g, ',').split(' ');
|
||
if (box.length > 4) {
|
||
console.error('shadow don\'t spread option');
|
||
return;
|
||
}
|
||
this.ctx.shadowOffsetX = parseInt(box[0], 10);
|
||
this.ctx.shadowOffsetY = parseInt(box[1], 10);
|
||
this.ctx.shadowBlur = parseInt(box[2], 10);
|
||
this.ctx.shadowColor = box[3];
|
||
}
|
||
|
||
_getAngle(angle) {
|
||
return Number(angle) * Math.PI / 180;
|
||
}
|
||
} |