133 lines
3.3 KiB
Vue
133 lines
3.3 KiB
Vue
<template>
|
|
<div class="s-canvas">
|
|
<canvas id="s-canvas" :width="contentWidth" :height="contentHeight" />
|
|
</div>
|
|
</template>
|
|
<script>
|
|
export default {
|
|
name: 'SIdentify',
|
|
props: {
|
|
identifyCode: {
|
|
type: String,
|
|
default: '1234'
|
|
},
|
|
fontSizeMin: {
|
|
type: Number,
|
|
default: 20
|
|
},
|
|
fontSizeMax: {
|
|
type: Number,
|
|
default: 35
|
|
},
|
|
backgroundColorMin: {
|
|
type: Number,
|
|
default: 180
|
|
},
|
|
backgroundColorMax: {
|
|
type: Number,
|
|
default: 240
|
|
},
|
|
colorMin: {
|
|
type: Number,
|
|
default: 50
|
|
},
|
|
colorMax: {
|
|
type: Number,
|
|
default: 160
|
|
},
|
|
lineColorMin: {
|
|
type: Number,
|
|
default: 40
|
|
},
|
|
lineColorMax: {
|
|
type: Number,
|
|
default: 180
|
|
},
|
|
dotColorMin: {
|
|
type: Number,
|
|
default: 0
|
|
},
|
|
dotColorMax: {
|
|
type: Number,
|
|
default: 255
|
|
},
|
|
contentWidth: {
|
|
type: Number,
|
|
default: 112
|
|
},
|
|
contentHeight: {
|
|
type: Number,
|
|
default: 47
|
|
}
|
|
},
|
|
watch: {
|
|
identifyCode() {
|
|
this.drawPic()
|
|
}
|
|
},
|
|
mounted() {
|
|
this.drawPic()
|
|
},
|
|
methods: {
|
|
// 生成一个随机数
|
|
randomNum(min, max) {
|
|
return Math.floor(Math.random() * (max - min) + min)
|
|
},
|
|
// 生成一个随机的颜色
|
|
randomColor(min, max) {
|
|
const r = this.randomNum(min, max)
|
|
const g = this.randomNum(min, max)
|
|
const b = this.randomNum(min, max)
|
|
return 'rgb(' + r + ',' + g + ',' + b + ')'
|
|
},
|
|
drawPic() {
|
|
const canvas = document.getElementById('s-canvas')
|
|
const ctx = canvas.getContext('2d')
|
|
ctx.textBaseline = 'bottom'
|
|
// 绘制背景
|
|
ctx.fillStyle = this.randomColor(this.backgroundColorMin, this.backgroundColorMax)
|
|
ctx.fillRect(0, 0, this.contentWidth, this.contentHeight)
|
|
// 绘制文字
|
|
for (let i = 0; i < this.identifyCode.length; i++) {
|
|
this.drawText(ctx, this.identifyCode[i], i)
|
|
}
|
|
this.drawLine(ctx)
|
|
this.drawDot(ctx)
|
|
},
|
|
drawText(ctx, txt, i) {
|
|
ctx.fillStyle = this.randomColor(this.colorMin, this.colorMax)
|
|
ctx.font = this.randomNum(this.fontSizeMin, this.fontSizeMax) + 'px SimHei'
|
|
const x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))
|
|
const y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)
|
|
var deg = this.randomNum(-45, 45)
|
|
// 修改坐标原点和旋转角度
|
|
ctx.translate(x, y)
|
|
ctx.rotate(deg * Math.PI / 180)
|
|
ctx.fillText(txt, 0, 0)
|
|
// 恢复坐标原点和旋转角度
|
|
ctx.rotate(-deg * Math.PI / 180)
|
|
ctx.translate(-x, -y)
|
|
},
|
|
drawLine(ctx) {
|
|
// 绘制干扰线
|
|
for (let i = 0; i < 3; i++) {
|
|
ctx.strokeStyle = this.randomColor(this.lineColorMin, this.lineColorMax)
|
|
ctx.beginPath()
|
|
ctx.moveTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight))
|
|
ctx.lineTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight))
|
|
ctx.stroke()
|
|
}
|
|
},
|
|
drawDot(ctx) {
|
|
// 绘制干扰点
|
|
for (let i = 0; i < 30; i++) {
|
|
ctx.fillStyle = this.randomColor(0, 255)
|
|
ctx.beginPath()
|
|
ctx.arc(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight), 1, 0, 2 * Math.PI)
|
|
ctx.fill()
|
|
}
|
|
}
|
|
}
|
|
}
|
|
</script>
|