From 69a91f59f2b48d0cb434d6858915bda605f7a12e Mon Sep 17 00:00:00 2001
From: jiaming <743192023@qq.com>
Date: Mon, 10 Dec 2018 18:23:02 +0800
Subject: [PATCH] add some new fun to extend canvas draw

---
 src/plugins/canvasExtend.js | 79 +++++++++++++++++++++++++++++++++----
 1 file changed, 72 insertions(+), 7 deletions(-)

diff --git a/src/plugins/canvasExtend.js b/src/plugins/canvasExtend.js
index 2fbc345..040194f 100644
--- a/src/plugins/canvasExtend.js
+++ b/src/plugins/canvasExtend.js
@@ -1,4 +1,4 @@
-export function drawLine (ctx, lineBegin, lineEnd, lineWidth = 2, lineColor = '#000', dashArray = [10, 10]) {
+export function drawLine (ctx, lineBegin, lineEnd, lineWidth = 2, lineColor = '#000', dashArray = [10, 0]) {
   if (!ctx || !lineBegin || !lineEnd) return
 
   ctx.beginPath()
@@ -15,14 +15,19 @@ export function drawLine (ctx, lineBegin, lineEnd, lineWidth = 2, lineColor = '#
   ctx.stroke()
 }
 
+export function drawPolylinePath (ctx, points, close = false) {
+  if (!ctx || !points.length) return
+
+  points.forEach((point, i) =>
+    point && (i === 0 ? ctx.moveTo(...point) : ctx.lineTo(...point)))
+
+  close && ctx.lineTo(...points[0])
+}
+
 export function drawPolyline (ctx, points, lineWidth = 2, lineColor = '#000', close = false, dashArray = [10, 0]) {
   if (!ctx || !points.length) return
 
-  ctx.beginPath()
-
-  points.forEach((point, i) => i === 0 ? ctx.moveTo(...point) : ctx.lineTo(...point))
-
-  close && ctx.lineTo(...points[0])
+  drawPolylinePath(ctx, points, close)
 
   ctx.lineWidth = lineWidth
   ctx.strokeStyle = lineColor
@@ -31,9 +36,69 @@ export function drawPolyline (ctx, points, lineWidth = 2, lineColor = '#000', cl
   ctx.stroke()
 }
 
+export function drawSmoothlinePath (ctx, points, close = false) {
+  if (!ctx || !points.length) return
+
+  const pointsNum = points.length
+
+  points.forEach((point, i) => {
+    if (i === 0) {
+
+    } if (i === pointsNum - 1) {
+
+    } else {
+
+    }
+  })
+}
+
+export function getBezierCurveLineControlPoints (pointBefore, pointMiddle, pointAfter) {
+  const [offsetA, offsetB] = [6, 6]
+
+  return [
+    [
+      pointMiddle[0] + offsetA(pointAfter[0] - pointBefore[0]),
+      pointMiddle[1] + offsetA(pointAfter[1] - pointBefore[1])
+    ],
+    [
+      (pointAfter[0] - offsetB())
+    ]
+  ]
+}
+
+export function drawSmoothline (ctx, points, lineWidth = 2, lineColor = '#000', close = false, dashArray = [10, 0]) {
+  if (!ctx || !points.length) return
+
+  drawSmoothlinePath()
+}
+
+export function drawBezierCurveLinePath (ctx, points) {
+  if (!ctx || !points.length) return
+
+  points.forEach(point => ctx.bezierCurveTo(...point))
+}
+
+export function drawPoints (ctx, points, radius = 10, color = '#000') {
+  points.forEach(point => {
+    if (!point) return
+
+    ctx.beginPath()
+
+    ctx.arc(...point, radius, 0, Math.PI * 2)
+
+    ctx.fillStyle = color
+
+    ctx.fill()
+  })
+}
+
 const canvas = {
   drawLine,
-  drawPolyline
+  drawPolylinePath,
+  drawPolyline,
+  drawSmoothlinePath,
+  drawSmoothline,
+  drawPoints
 }
 
 export default function (Vue) {