98 lines
2.1 KiB
JavaScript
98 lines
2.1 KiB
JavaScript
export default class WxCanvas {
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constructor(ctx, canvasId) {
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this.ctx = ctx;
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this.canvasId = canvasId;
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this.chart = null;
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// this._initCanvas(zrender, ctx);
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this._initStyle(ctx);
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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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// canvasToTempFilePath(opt) {
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// if (!opt.canvasId) {
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// opt.canvasId = this.canvasId;
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// }
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// return wx.canvasToTempFilePath(opt, this);
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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 () {
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// noop
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}
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detachEvent() {
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// noop
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}
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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);
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});
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}
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_initStyle(ctx) {
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var styles = ['fillStyle', 'strokeStyle', 'globalAlpha',
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'textAlign', 'textBaseAlign', 'shadow', 'lineWidth',
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'lineCap', 'lineJoin', 'lineDash', 'miterLimit', 'fontSize'];
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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 !== 'fillStyle' && style !== 'strokeStyle'
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|| value !== 'none' && value !== null
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) {
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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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ctx.createRadialGradient = () => {
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return ctx.createCircularGradient(arguments);
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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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}
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