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<template>
<div class="gc-canvas" @click="reloadPic">
<canvas id="gc-canvas" :width="contentWidth" :height="contentHeight"></canvas>
</div>
</template>
<script>
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import { getAction } from '@/api/manage'
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export default {
name: 'JGraphicCode',
props: {
length:{
type: Number,
default: 4
},
fontSizeMin: {
type: Number,
default: 20
},
fontSizeMax: {
type: Number,
default: 45
},
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:136
},
contentHeight: {
type: Number,
default: 38
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},
remote:{
type:Boolean,
default:false,
required:false
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}
},
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) {
let r = this.randomNum(min, max)
let g = this.randomNum(min, max)
let b = this.randomNum(min, max)
return 'rgb(' + r + ',' + g + ',' + b + ')'
},
drawPic () {
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this.randomCode().then(()=>{
let canvas = document.getElementById('gc-canvas')
let 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.code.length; i++) {
this.drawText(ctx, this.code[i], i)
}
this.drawLine(ctx)
this.drawDot(ctx)
this.$emit("success",this.code)
})
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},
drawText (ctx, txt, i) {
ctx.fillStyle = this.randomColor(this.colorMin, this.colorMax)
let fontSize = this.randomNum(this.fontSizeMin, this.fontSizeMax)
ctx.font = fontSize + 'px SimHei'
let padding = 10;
let offset = (this.contentWidth-40)/(this.code.length-1)
let x=padding;
if(i>0){
x = padding+(i*offset)
}
//let x = (i + 1) * (this.contentWidth / (this.code.length + 1))
let y = this.randomNum(this.fontSizeMax, this.contentHeight - 5)
if(fontSize>40){
y=40
}
var deg = this.randomNum(-10,10)
// 修改坐标原点和旋转角度
ctx.translate(x, y)
ctx.rotate(deg * Math.PI / 180)
ctx.fillText(txt, 0, 0)
// 恢复坐标原点和旋转角度
ctx.rotate(-deg * Math.PI / 180)
ctx.translate(-x, -y)
},
drawLine (ctx) {
// 绘制干扰线
for (let i = 0; i <1; i++) {
ctx.strokeStyle = this.randomColor(this.lineColorMin, this.lineColorMax)
ctx.beginPath()
ctx.moveTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight))
ctx.lineTo(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight))
ctx.stroke()
}
},
drawDot (ctx) {
// 绘制干扰点
for (let i = 0; i < 100; i++) {
ctx.fillStyle = this.randomColor(0, 255)
ctx.beginPath()
ctx.arc(this.randomNum(0, this.contentWidth), this.randomNum(0, this.contentHeight), 1, 0, 2 * Math.PI)
ctx.fill()
}
},
reloadPic(){
this.drawPic()
},
randomCode(){
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return new Promise((resolve)=>{
if(this.remote==true){
getAction("/sys/getCheckCode").then(res=>{
console.log("aaaaa",res)
if(res.success){
this.checkKey = res.result.key
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this.code = window.atob(res.result.code)
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resolve();
}else{
this.$message.error("生成验证码错误,请联系系统管理员")
this.code = 'BUG'
resolve();
}
}).catch(()=>{
console.log("生成验证码连接服务器异常")
this.code = 'BUG'
resolve();
})
}else{
this.randomLocalCode();
resolve();
}
})
},
randomLocalCode(){
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let random = ''
//去掉了I l i o O
let str = "QWERTYUPLKJHGFDSAZXCVBNMqwertyupkjhgfdsazxcvbnm1234567890"
for(let i = 0; i < this.length; i++) {
let index = Math.floor(Math.random()*57);
random += str[index];
}
this.code = random
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},
getLoginParam(){
return {
checkCode:this.code,
checkKey:this.checkKey
}
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}
},
mounted () {
this.drawPic()
},
data(){
return {
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code:"",
checkKey:""
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}
}
}
</script>
<style scoped>
</style>
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