tui-vcode.vue
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<template>
<canvas class="tui-vcode--box" :canvas-id="canvasId" :id="canvasId"
:style="{width:width + 'px',height: height + 'px'}" @tap="draw" v-if="canvasId"></canvas>
</template>
<script>
/**
* 获取范围内的随机数
* @param {Number} min 最小值
* @param {Number} max 最大值
*/
const randomNum = (min, max) => {
return Math.floor(Math.random() * (max - min) + min)
}
/**
* 获取范围内的随机颜色值
* @param {Number} min 最小值
* @param {Number} max 最大值
*/
const randomColor = (min, max) => {
const _r = randomNum(min, max)
const _g = randomNum(min, max)
const _b = randomNum(min, max)
return `rgb(${_r}, ${_g}, ${_b})`
}
const canvasId = `tui_${Math.ceil(Math.random() * 10e5).toString(36)}`
export default {
name: "tui-vcode",
emits: ['change'],
props: {
//验证码范围字符串
vcodeStr: {
type: String,
default: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789',
},
//验证码长度
length: {
type: [Number, String],
default: 4,
},
//画布宽度
width: {
type: [Number, String],
default: 100,
},
//画布高度
height: {
type: [Number, String],
default: 36,
},
//画布背景色
bgColor: {
type: String,
default: '',
},
//画布字体颜色
fontColor: {
type: String,
default: '',
},
//是否显示干扰点
hasPoint: {
type: Boolean,
default: true,
},
//是否显示干扰线
hasLine: {
type: Boolean,
default: true
}
},
data() {
return {
canvasId
};
},
created() {
this.ctx = null
},
mounted() {
this.$nextTick(()=>{
setTimeout(() => {
this.draw()
}, 50)
})
},
// #ifndef VUE3
beforeDestroy() {
this.ctx = null
},
// #endif
// #ifdef VUE3
beforeUnmount() {
this.ctx = null
},
// #endif
methods: {
render(ctx) {
let vcode = ''
if (typeof ctx.setTextBaseline === 'function') {
ctx.setTextBaseline('bottom')
}
let width = Number(this.width)
let height = Number(this.height)
// 绘制矩形，并设置填充色
ctx.setFillStyle(this.bgColor ? this.bgColor : randomColor(180, 240))
ctx.fillRect(0, 0, width, height)
let num = Number(this.length) || 4
// 绘制随机生成 n 位的验证码
for (let i = 0; i < num; i++) {
const x = (width - 10) / num * i + 10
const y = randomNum(height / 2, height)
const deg = randomNum(-45, 45)
const txt = this.vcodeStr[randomNum(0, this.vcodeStr.length)]
const fontSize = randomNum(16, 40)
const halfHeight = parseInt(height / 2)
vcode += txt
ctx.setFillStyle(this.fontColor ? this.fontColor : randomColor(10, 100))
ctx.setFontSize(fontSize > halfHeight ? halfHeight : fontSize)
ctx.translate(x, y)
ctx.rotate(deg * Math.PI / 180)
ctx.fillText(txt, 0, 0)
ctx.rotate(-deg * Math.PI / 180)
ctx.translate(-x, -y)
}
// 绘制干扰线
if (!!this.hasLine) {
for (let i = 0; i < num; i++) {
ctx.setStrokeStyle(randomColor(90, 180))
ctx.beginPath()
ctx.moveTo(randomNum(0, width), randomNum(0, height))
ctx.lineTo(randomNum(0, width), randomNum(0, height))
ctx.stroke()
}
}
// 绘制干扰点
if (!!this.hasPoint) {
for (let i = 0; i < num * 10; i++) {
ctx.setFillStyle(randomColor(0, 255))
ctx.beginPath()
ctx.arc(randomNum(0, width), randomNum(0, height), 1, 0, 2 * Math.PI)
ctx.fill()
}
}
return vcode
},
draw() {
if (!this.ctx) {
this.ctx = uni.createCanvasContext(this.canvasId, this)
}
this.ctx.clearRect(0, 0, this.width, this.height)
const value = this.render(this.ctx)
this.ctx.draw(false, () => this.$emit('change', {
value
}))
}
}
}
</script>
<style scoped></style>