add canvas extend plugin

src/plugins/canvasExtend.js

@@ -0,0 +1,23 @@
+export function drawLine (ctx, lineBegin, lineEnd, lineWidth = 2, lineColor = '#000') {
+  if (!ctx || !lineBegin || !lineEnd) return
+
+  ctx.beginPath()
+
+  ctx.moveTo(...lineBegin)
+  ctx.lineTo(...lineEnd)
+
+  ctx.closePath()
+
+  ctx.lineWidth = lineWidth
+  ctx.strokeStyle = lineColor
+
+  ctx.stroke()
+}
+
+const canvas = {
+  drawLine
+}
+
+export default function (Vue) {
+  Vue.prototype.canvas = canvas
+}

src/plugins/index.js

@@ -1,5 +1,8 @@
 import methodsExtend from './methodsExtend'
 
+import canvasExtend from './canvasExtend'
+
 export default function (Vue) {
   methodsExtend(Vue)
+  canvasExtend(Vue)
 }