133 lines
3.6 KiB
Vue
133 lines
3.6 KiB
Vue
<template>
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<div class="s-canvas">
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<canvas id="s-canvas" :width="contentWidth" :height="contentHeight"></canvas>
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</div>
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</template>
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<script>
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export default {
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name: 'SIdentify',
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props: {
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identifyCode: {
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type: String,
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default: '1234'
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},
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fontSizeMin: {
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type: Number,
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default: 16
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},
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fontSizeMax: {
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type: Number,
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default: 40
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},
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backgroundColorMin: {
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type: Number,
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default: 180
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},
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backgroundColorMax: {
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type: Number,
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default: 240
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},
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colorMin: {
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type: Number,
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default: 50
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},
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colorMax: {
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type: Number,
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default: 160
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},
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lineColorMin: {
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type: Number,
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default: 40
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},
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lineColorMax: {
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type: Number,
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default: 180
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},
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dotColorMin: {
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type: Number,
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default: 0
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},
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dotColorMax: {
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type: Number,
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default: 255
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},
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contentWidth: {
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type: Number,
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default: 160
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},
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contentHeight: {
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type: Number,
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default: 40
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}
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},
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methods: {
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// 生成一个随机数
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randomNum (min, max) {
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return Math.floor(Math.random() * (max - min) + min)
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},
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// 生成一个随机的颜色
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randomColor (min, max) {
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let r = this.randomNum(min, max)
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let g = this.randomNum(min, max)
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let b = this.randomNum(min, max)
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return 'rgb(' + r + ',' + g + ',' + b + ')'
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},
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drawPic () {
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let canvas = document.getElementById('s-canvas')
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let ctx = canvas.getContext('2d')
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ctx.textBaseline = 'bottom'
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// 绘制背景
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ctx.fillStyle = this.randomColor(this.backgroundColorMin, this.backgroundColorMax)
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ctx.fillRect(0, 0, this.contentWidth, this.contentHeight)
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// 绘制文字
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for (let i = 0; i < this.identifyCode.length; i++) {
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this.drawText(ctx, this.identifyCode[i], i)
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}
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this.drawLine(ctx)
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this.drawDot(ctx)
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},
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drawText (ctx, txt, i) {
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ctx.fillStyle = this.randomColor(this.colorMin, this.colorMax)
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ctx.font = this.randomNum(this.fontSizeMin, this.fontSizeMax) + 'px SimHei'
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let x = (i + 1) * (this.contentWidth / (this.identifyCode.length + 1))
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let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)
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var deg = this.randomNum(-45, 45)
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// 修改坐标原点和旋转角度
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ctx.translate(x, y)
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ctx.rotate(deg * Math.PI / 180)
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ctx.fillText(txt, 0, 0)
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// 恢复坐标原点和旋转角度
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ctx.rotate(-deg * Math.PI / 180)
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ctx.translate(-x, -y)
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},
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drawLine (ctx) {
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// 绘制干扰线
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// for (let i = 0; i < 8; i++) {
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// ctx.strokeStyle = this.randomColor(this.lineColorMin, this.lineColorMax)
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// ctx.beginPath()
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// ctx.moveTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight))
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// ctx.lineTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight))
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// ctx.stroke()
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// }
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},
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drawDot (ctx) {
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// 绘制干扰点
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// for (let i = 0; i < 100; i++) {
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// ctx.fillStyle = this.randomColor(0, 255)
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// ctx.beginPath()
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// ctx.arc(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight), 1, 0, 2 * Math.PI)
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// ctx.fill()
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// }
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}
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},
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watch: {
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identifyCode () {
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this.drawPic()
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}
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},
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mounted () {
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this.drawPic()
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}
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}
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</script>
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