4b045f7c
 刘淇
江阴初始化项目
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export default class WxCanvas {
constructor(ctx, canvasId) {
this.ctx = ctx;
this.canvasId = canvasId;
this.chart = null;
WxCanvas.initStyle(ctx);
this.initEvent();
}
getContext(contextType) {
return contextType === '2d' ? this.ctx : null;
}
setChart(chart) {
this.chart = chart;
}
attachEvent() {
// noop
}
detachEvent() {
// noop
}
static initStyle(ctx) {
const styles = ['fillStyle', 'strokeStyle', 'globalAlpha',
'textAlign', 'textBaseAlign', 'shadow', 'lineWidth',
'lineCap', 'lineJoin', 'lineDash', 'miterLimit', 'fontSize'];
styles.forEach((style) => {
Object.defineProperty(ctx, style, {
set: (value) => {
if ((style !== 'fillStyle' && style !== 'strokeStyle')
|| (value !== 'none' && value !== null)
) {
ctx[`set${style.charAt(0).toUpperCase()}${style.slice(1)}`](value);
}
},
});
});
ctx.createRadialGradient = () => ctx.createCircularGradient(arguments);
}
initEvent() {
this.event = {};
const eventNames = [{
wxName: 'touchStart',
ecName: 'mousedown',
}, {
wxName: 'touchMove',
ecName: 'mousemove',
}, {
wxName: 'touchEnd',
ecName: 'mouseup',
}, {
wxName: 'touchEnd',
ecName: 'click',
}];
eventNames.forEach((name) => {
this.event[name.wxName] = (e) => {
const touch = e.mp.touches[0];
this.chart._zr.handler.dispatch(name.ecName, {
zrX: name.wxName === 'tap' ? touch.clientX : touch.x,
zrY: name.wxName === 'tap' ? touch.clientY : touch.y,
});
};
});
}
}
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