123 lines
3.2 KiB
Vue
123 lines
3.2 KiB
Vue
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<template>
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<div class="s-canvas">
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<canvas id="s-canvas" :width="contentWidth" :height="contentHeight" />
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</div>
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</template>
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<script setup>
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import { onMounted, watch } from "vue";
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defineOptions({
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name: "AppVerificationCode",
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});
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const props = defineProps({
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identifyCode: { type: String, default: "1234" },
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fontSizeMin: { type: Number, default: 25 },
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fontSizeMax: { type: Number, default: 30 },
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backgroundColorMin: { type: Number, default: 255 },
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backgroundColorMax: { type: Number, default: 255 },
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colorMin: { type: Number, default: 0 },
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colorMax: { type: Number, default: 160 },
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lineColorMin: { type: Number, default: 100 },
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lineColorMax: { type: Number, default: 255 },
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dotColorMin: { type: Number, default: 0 },
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dotColorMax: { type: Number, default: 255 },
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contentWidth: { type: Number, default: 112 },
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contentHeight: { type: Number, default: 31 },
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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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const r = randomNum(min, max);
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const g = randomNum(min, max);
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const 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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const canvas = document.getElementById("s-canvas");
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const 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(
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props.backgroundColorMin,
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props.backgroundColorMax
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);
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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(props.colorMin, props.colorMax);
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ctx.font = randomNum(props.fontSizeMin, props.fontSizeMax) + "px SimHei";
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const x = (i + 1) * (props.contentWidth / (props.identifyCode.length + 1));
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const y = randomNum(props.fontSizeMax, props.contentHeight - 5);
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const deg = 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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const drawLine = (ctx) => {
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// 绘制干扰线
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for (let i = 0; i < 5; i++) {
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ctx.strokeStyle = randomColor(props.lineColorMin, props.lineColorMax);
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ctx.beginPath();
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ctx.moveTo(
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randomNum(0, props.contentWidth),
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randomNum(0, props.contentHeight)
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);
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ctx.lineTo(
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randomNum(0, props.contentWidth),
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randomNum(0, props.contentHeight)
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);
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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 < 80; i++) {
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ctx.fillStyle = randomColor(0, 255);
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ctx.beginPath();
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ctx.arc(
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randomNum(0, props.contentWidth),
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randomNum(0, props.contentHeight),
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1,
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0,
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2 * Math.PI
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);
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ctx.fill();
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}
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};
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watch(
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() => props.identifyCode,
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() => {
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drawPic();
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}
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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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<style scoped lang="scss">
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.s-canvas {
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height: 38px;
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padding-top: 3px;
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canvas {
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margin-top: 1px;
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margin-right: 10px;
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}
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}
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</style>
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