From 4c2fe71409c7318b85119bf63be0e311ba2f73f3 Mon Sep 17 00:00:00 2001
From: terrywan <terrywan@webank.com>
Date: Thu, 11 Aug 2022 11:58:37 +0800
Subject: [PATCH] =?UTF-8?q?feat:=20=E6=96=B0=E5=A2=9E=E4=BC=A0=E9=80=92thi?=
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 =?UTF-8?q?=E7=BB=84=E4=BB=B6=E5=86=85=E5=8F=AF=E4=BB=A5=E6=B8=B2=E6=9F=93?=
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文档参考:
https://developers.weixin.qq.com/miniprogram/dev/api/canvas/wx.createCanvasContext.html
CanvasContext wx.createCanvasContext(string canvasId, Object this)
在自定义组件下，当前组件实例的this，表示在这个自定义组件下查找拥有 canvas-id 的 canvas ，如果省略则不在任何自定义组件内查找
---
 src/app.js | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/app.js b/src/app.js
index fe3ee55..eb0dd55 100644
--- a/src/app.js
+++ b/src/app.js
@@ -5,7 +5,7 @@ import Event from './util/event';
 import { findCurrentIndex, findRadarChartCurrentIndex, findPieChartCurrentIndex, getSeriesDataItem, getToolTipData } from  './components/charts-data'
 import { calValidDistance } from './components/charts-util';
 
-let Charts = function(opts) {
+let Charts = function(opts, self) {
     opts.title = opts.title || {};
     opts.subtitle = opts.subtitle || {};
     opts.yAxis = opts.yAxis || {};
@@ -20,7 +20,7 @@ let Charts = function(opts) {
 
     this.opts = opts;
     this.config = config;
-    this.context = wx.createCanvasContext(opts.canvasId);
+    this.context = self ? wx.createCanvasContext(opts.canvasId, self) : wx.createCanvasContext(opts.canvasId);
     // store calcuated chart data
     // such as chart point coordinate
     this.chartData = {};
@@ -121,4 +121,4 @@ Charts.prototype.scrollEnd = function (e) {
     }
 }
 
-export default Charts;
\ No newline at end of file
+export default Charts;