<script setup>
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import {computed, onMounted, watch, defineEmits} from "vue";
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const props = defineProps({
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identifyCode: { //默认***
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type: String,
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default: '1234'
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},
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fontSizeMin: { // 字体最小值
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type: Number,
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default: 35
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},
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fontSizeMax: { // 字体最大值
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type: Number,
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default: 40
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},
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backgroundColorMin: { // 验证码图片背景色最小值
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type: Number,
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default: 200
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},
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backgroundColorMax: { // 验证码图片背景色最大值
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type: Number,
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default: 220
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},
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dotColorMin: { // 背景干扰点最小值
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type: Number,
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default: 60
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},
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dotColorMax: { // 背景干扰点最大值
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type: Number,
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default: 120
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},
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contentWidth: { //容器宽度
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type: Number,
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default: 130
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},
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contentHeight: { //容器高度
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type: Number,
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default: 43
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}
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});
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// 生成一个随机数
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const 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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const randomColor = (min, max) => {
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let r = randomNum(min, max)
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let g = randomNum(min, max)
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let b = randomNum(min, max)
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return 'rgb(' + r + ',' + g + ',' + b + ')'
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}
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const 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 = randomColor(props.backgroundColorMin, props.backgroundColorMax)
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ctx.fillRect(0, 0, props.contentWidth, props.contentHeight)
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// 绘制文字
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for (let i = 0; i < props.identifyCode.length; i++) {
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drawText(ctx, props.identifyCode[i], i)
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}
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drawLine(ctx)
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drawDot(ctx)
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};
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const drawText = (ctx, txt, i) => {
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ctx.fillStyle = randomColor(50, 160) //随机生成字体颜色
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ctx.font = randomNum(props.fontSizeMin, props.fontSizeMax) + 'px SimHei' //随机生成字体大小
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let x = (i + 1) * (props.contentWidth / (props.identifyCode.length + 1))
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let y = randomNum(props.fontSizeMax, props.contentHeight - 5)
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let deg = randomNum(-30, 30)
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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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const drawLine = (ctx) => {
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// 绘制干扰线
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for (let i = 0; i < 4; i++) {
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ctx.strokeStyle = randomColor(100, 200)
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ctx.beginPath()
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ctx.moveTo(randomNum(0, props.contentWidth), randomNum(0, props.contentHeight))
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ctx.lineTo(randomNum(0, props.contentWidth), randomNum(0, props.contentHeight))
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ctx.stroke()
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}
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};
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const drawDot = (ctx) => {
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// 绘制干扰点
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for (let i = 0; i < 30; i++) {
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ctx.fillStyle = randomColor(0, 255)
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ctx.beginPath()
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ctx.arc(randomNum(0, props.contentWidth), randomNum(0, props.contentHeight), 1, 0, 2 * Math.PI)
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ctx.fill()
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}
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};
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const emits = defineEmits(['click'])
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const handleClick = () => {
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emits('click');
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}
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const matchCode = computed(()=>{
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return props.identifyCode;
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});
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watch(matchCode, ()=>{
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drawPic();
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});
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onMounted(()=>{
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drawPic();
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});
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</script>
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<template>
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<div class="s-canvas" :style="{'width:': contentWidth+'px', 'height': contentHeight+'px'}" @click="handleClick">
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<canvas id="s-canvas" width="130" height="48"></canvas>
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</div>
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</template>
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<style scoped>
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.s-canvas {
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cursor: pointer;
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vertical-align: middle;
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}
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.s-canvas canvas {
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width: 100%;
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height: 100%;
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}
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</style>
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