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add draw poly line fun

This commit is contained in:
jiaming 2018-12-08 16:05:19 +08:00
parent 8fd59e4111
commit 2f53405159
1 changed files with 22 additions and 2 deletions
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24
src/plugins/canvasExtend.js
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@ -1,4 +1,4 @@
export function drawLine (ctx, lineBegin, lineEnd, lineWidth = 2, lineColor = '#000') { export function drawLine (ctx, lineBegin, lineEnd, lineWidth = 2, lineColor = '#000', dashArray = [10, 10]) {
if (!ctx || !lineBegin || !lineEnd) return if (!ctx || !lineBegin || !lineEnd) return
ctx.beginPath() ctx.beginPath()
@ -10,12 +10,32 @@ export function drawLine (ctx, lineBegin, lineEnd, lineWidth = 2, lineColor = '#
ctx.lineWidth = lineWidth ctx.lineWidth = lineWidth
ctx.strokeStyle = lineColor ctx.strokeStyle = lineColor
ctx.setLineDash(dashArray)
ctx.stroke()
}
export function drawPolyline (ctx, points, lineWidth = 2, lineColor = '#000', close = false, dashArray = [10, 10]) {
if (!ctx || !points.length) return
ctx.beginPath()
points.forEach((point, i) => i === 0 ? ctx.moveTo(...point) : ctx.LineTo(...point))
close && ctx.lineTo(...points[0])
ctx.closePath()
ctx.lineWidth = lineWidth
ctx.strokeStyle = lineColor
ctx.setLineDash(dashArray)
ctx.stroke() ctx.stroke()
} }
const canvas = { const canvas = {
drawLine drawLine,
drawPolyline
} }
export default function (Vue) { export default function (Vue) {