const cacheChart = {}
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class Image {
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constructor() {
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// __zr.dom
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this.currentSrc = null
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this.naturalHeight = 0
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this.naturalWidth = 0
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this.width = 0
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this.height = 0
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this.tagName = 'IMG'
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}
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set src(src) {
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this.currentSrc = src
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uni.getImageInfo({
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src,
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success: (res) => {
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this.naturalWidth = this.width = res.width
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this.naturalHeight = this.height = res.height
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this.onload()
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},
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fail: () => {
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this.onerror()
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}
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})
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}
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get src() {
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return this.currentSrc
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}
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}
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export default class Canvas {
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constructor(ctx, canvasId, isNew, canvasNode) {
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cacheChart[canvasId] = {ctx}
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this.canvasId = canvasId;
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this.chart = null;
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this.isNew = isNew
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if (isNew) {
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this.canvasNode = canvasNode;
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} else {
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this.canvasNode = {
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createImage: () => {
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return new Image()
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}
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};
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this._initStyle(ctx);
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}
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this._initEvent();
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}
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getContext(contextType) {
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if (contextType === '2d') {
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return this.ctx;
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}
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}
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setChart(chart) {
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this.chart = chart;
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}
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attachEvent(e) {}
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detachEvent() {}
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addEventListener() {}
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removeEventListener() {}
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_initCanvas(zrender, ctx) {
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zrender.util.getContext = function() {
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return ctx;
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};
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zrender.util.$override('measureText', function(text, font) {
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ctx.font = font || '12px sans-serif';
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return ctx.measureText(text, font);
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});
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}
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strLen(str) {
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let len = 0;
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for (let i = 0; i < str.length; i++) {
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if (str.charCodeAt(i) > 0 && str.charCodeAt(i) < 128) {
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len++;
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} else {
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len += 2;
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}
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}
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return len;
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}
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_initStyle(ctx) {
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var styles = [
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'fillStyle',
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'strokeStyle',
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'fontSize',
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'globalAlpha',
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'opacity',
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'textAlign',
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'textBaseline',
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'shadow',
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'lineWidth',
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'lineCap',
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'lineJoin',
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'lineDash',
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'miterLimit',
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// #ifdef MP-TOUTIAO
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'font'
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// #endif
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];
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const fontSizeReg = /([\d\.]+)px/;
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const colorReg = /#([0-9a-fA-F])([0-9a-fA-F])([0-9a-fA-F])\b/g;
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styles.forEach(style => {
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Object.defineProperty(ctx, style, {
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set: value => {
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if (style === 'font' && fontSizeReg.test(value)) {
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const match = fontSizeReg.exec(value);
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ctx.setFontSize(match[1]);
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return;
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}
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if (style === 'opacity') {
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ctx.setGlobalAlpha(value)
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return;
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}
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if (style !== 'fillStyle' && style !== 'strokeStyle' || value !== 'none' && value !== null) {
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// #ifdef H5 || APP-PLUS || MP-BAIDU
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if(typeof value == 'object') {
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if (value.hasOwnProperty('colorStop') || value.hasOwnProperty('colors')) {
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ctx['set' + style.charAt(0).toUpperCase() + style.slice(1)](value);
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}
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return
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}
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// #endif
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// #ifdef MP-TOUTIAO
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if(colorReg.test(value)) {
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value = value.replace(colorReg, '#$1$1$2$2$3$3')
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}
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// #endif
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ctx['set' + style.charAt(0).toUpperCase() + style.slice(1)](value);
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}
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}
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});
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});
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if(!this.isNew) {
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ctx.uniDrawImage = ctx.drawImage
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ctx.drawImage = (...a) => {
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a[0] = a[0].src
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ctx.uniDrawImage(...a)
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}
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}
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if(!ctx.createRadialGradient) {
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ctx.createRadialGradient = function() {
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return ctx.createCircularGradient(...[...arguments].slice(-3))
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};
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}
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// 字节不支持
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if (!ctx.strokeText) {
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ctx.strokeText = (...a) => {
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ctx.fillText(...a)
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}
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}
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// 钉钉不支持
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if (!ctx.measureText) {
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ctx.measureText = (text, font) => {
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let fontSize = 12;
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if (font) {
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fontSize = parseInt(font.match(/([\d\.]+)px/)[1])
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}
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fontSize /= 2;
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return {
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width: this.strLen(text) * fontSize
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};
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}
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}
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}
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_initEvent() {
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this.event = {};
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const eventNames = [{
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wxName: 'touchStart',
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ecName: 'mousedown'
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}, {
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wxName: 'touchMove',
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ecName: 'mousemove'
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}, {
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wxName: 'touchEnd',
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ecName: 'mouseup'
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}, {
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wxName: 'touchEnd',
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ecName: 'click'
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}];
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eventNames.forEach(name => {
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this.event[name.wxName] = e => {
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const touch = e.touches[0];
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this.chart.getZr().handler.dispatch(name.ecName, {
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zrX: name.wxName === 'tap' ? touch.clientX : touch.x,
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zrY: name.wxName === 'tap' ? touch.clientY : touch.y
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});
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};
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});
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}
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set width(w) {
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if (this.canvasNode) this.canvasNode.width = w
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}
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set height(h) {
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if (this.canvasNode) this.canvasNode.height = h
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}
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get width() {
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if (this.canvasNode)
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return this.canvasNode.width
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return 0
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}
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get height() {
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if (this.canvasNode)
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return this.canvasNode.height
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return 0
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}
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get ctx() {
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return cacheChart[this.canvasId]['ctx'] || null
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}
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set chart(chart) {
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cacheChart[this.canvasId]['chart'] = chart
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}
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get chart() {
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return cacheChart[this.canvasId]['chart'] || null
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}
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}
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