82 lines
2.3 KiB
TypeScript
82 lines
2.3 KiB
TypeScript
import { createEffect } from 'solid-js';
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type CaptchaCanvasProps = {
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code: string;
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class?: string;
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};
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export default function CaptchaCanvas(props: CaptchaCanvasProps) {
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let canvasRef: HTMLCanvasElement | undefined;
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createEffect(() => {
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const canvas = canvasRef;
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if (!canvas) return;
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const ctx = canvas.getContext('2d');
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if (!ctx) return;
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const width = 176;
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const height = 52;
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const dpr = typeof window !== 'undefined' ? Math.max(1, window.devicePixelRatio || 1) : 1;
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canvas.style.width = `${width}px`;
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canvas.style.height = `${height}px`;
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canvas.width = Math.floor(width * dpr);
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canvas.height = Math.floor(height * dpr);
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ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
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// Clear and fill background
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ctx.clearRect(0, 0, width, height);
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ctx.fillStyle = '#ffffff';
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ctx.fillRect(0, 0, width, height);
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// Draw decorative lines
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for (let i = 0; i < 2; i += 1) {
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ctx.strokeStyle = i % 2 === 0 ? 'rgba(253,98,22,0.16)' : 'rgba(27,36,64,0.14)';
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ctx.lineWidth = 1;
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ctx.beginPath();
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ctx.moveTo(Math.random() * width, Math.random() * height);
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ctx.lineTo(Math.random() * width, Math.random() * height);
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ctx.stroke();
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}
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// Draw decorative circles
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for (let i = 0; i < 3; i += 1) {
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ctx.fillStyle = i % 2 === 0 ? 'rgba(253,98,22,0.10)' : 'rgba(27,36,64,0.09)';
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ctx.beginPath();
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ctx.arc(Math.random() * width, Math.random() * height, Math.random() * 1.8 + 0.6, 0, Math.PI * 2);
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ctx.fill();
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}
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// Draw characters
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const chars = String(props.code || '').slice(0, 6).split('');
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const startX = 16;
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const charGap = 24;
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chars.forEach((char, index) => {
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const x = startX + index * charGap;
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const y = height / 2 + 1;
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const rotation = 0;
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ctx.save();
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ctx.translate(x, y);
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ctx.rotate(rotation);
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ctx.textBaseline = 'middle';
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ctx.font = '800 22px "Courier New", monospace';
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ctx.fillStyle = index % 2 === 0 ? '#0f172a' : '#c2410c';
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ctx.lineWidth = 0;
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ctx.fillText(char, 0, 0);
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ctx.restore();
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});
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});
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return (
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<canvas
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ref={canvasRef}
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width={176}
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height={52}
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aria-label="Captcha image"
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draggable={false}
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onContextMenu={(event) => event.preventDefault()}
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class={props.class}
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/>
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);
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}
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