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31 lines
904 B
31 lines
904 B
import { useCallback, useEffect, useRef } from "react";
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export default function RealtimeLayer(props: {
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width: number;
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height: number;
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leftPadding: number;
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rightPadding: number;
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topPadding: number;
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bottomPadding: number;
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}) {
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const canvasRef = useRef<HTMLCanvasElement | null>(null);
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const draw = useCallback((ctx: CanvasRenderingContext2D) => {
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// 使用context对象进行绘图
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ctx.fillStyle = "skyblue"; // 设置填充颜色
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ctx.fillRect(50, 50, 150, 100); // 绘制一个矩形
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}, []);
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useEffect(() => {
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const canvas = canvasRef.current;
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if (!canvas) return;
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const context = canvas.getContext("2d");
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if (!context) return;
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draw(context);
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}, [draw]);
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return (
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<div>
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<canvas ref={canvasRef} width={props.width} height={props.height}></canvas>
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</div>
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);
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}
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