reactjs - 如何在 react 中获得 Canvas 的正确宽度和高度？

Question

我正在尝试在 React 中使用 Canvas 。下面的代码应该给我一个黑色的 800x800 Canvas ，但出于某种原因它忽略了我的尺寸并显示了一个 300x150 的 Canvas 。

import React, {Component} from "react";

class Sample extends Component {

    state = {
        canvasWidth: 800,
        canvasHeight: 800
    }
    canvasRef = React.createRef();

    componentDidMount() {
        const canvas = this.canvasRef.current;
        const context = canvas.getContext('2d');
        context.fillRect(0, 0, this.state.canvasWidth, this.state.canvasHeight);
    }

    render() {
        return (
            <div>
                <canvas ref={this.canvasRef} />
            </div>
        );
    }
}

export default Sample

Answer 1

您需要将宽度和高度设置为 html 属性:

   <canvas ref={this.canvasRef} width={this.state.canvasWidth} height={this.state.canvasHeight}/>