signCanvas= React.createRef(); 设置签名组件的属性 <CanvasDraw ref={this.signCanvas} brushColor="#000" brushRadius={3} lazyRadius={10} canvasWidth={"100%"} canvasHeight={250}/> 4、得到签名并转化为图片 let signImg = this.signCanvas.current.canvas.drawing.toDataURL('image/png'); 5、清空...
2. 创建React组件以容纳Canvas元素 你可以通过创建一个React组件来封装Canvas元素。这个组件将负责渲染Canvas标签并提供一个画布用于绘图。 jsx import React, { useRef, useEffect } from 'react'; function DrawingCanvas() { // 使用useRef来引用Canvas元素 const canvasRef = useRef(null); useEffect(() =>...
A simple yet powerful canvas-drawing component for React (Demo) Installation Install via NPM: npm install react-canvas-draw --save or YARN: yarn add react-canvas-draw Usage importReactfrom"react";importReactDOMfrom"react-dom";importCanvasDrawfrom"react-canvas-draw";ReactDOM.render(<CanvasDraw/...
handleMouseDown= (e) =>{this.isDrawingShape =trueif(this.canvasElem !==undefined) {this.coordinateScaleX =this.canvasElem.clientWidth /this.props.widththis.coordinateScaleY =this.canvasElem.clientHeight /this.props.height }this.writingCtx.lineWidth =this.props.shapeWidth /this.coordinateScaleXthis....
React Canvas Draw A simple yet powerful canvas-drawing component for React (Demo) Installation Install via NPM: npm install react-canvas-draw --save or YARN: yarn add react-canvas-draw Usage importReactfrom"react";importReactDOMfrom"react-dom";importCanvasDrawfrom"react-canvas-draw";ReactDOM.re...
This component was inspired by Maxime Mangel'sElmish.Canvas. I created this component as a learning exercise mainly. I wanted to see if I could derive the React component entirely in Fable, and I also wanted to see how the drawing syntax would look as a Computation Expression. This is my...
使用RoughJS 在我们的 canvas 上画线,我们需要按照以下步骤进行; 初始化绘图状态:首先设置必要的状态以跟踪绘图交互: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 const[drawing,setDrawing]=useState(false);const[elements,setElements]=useState([]); ...
<canvas onMouseDown={startDrawing} onMouseUp={endDrawing} onMouseMove={draw} ref={canvasRef} width={screenSize-300} height={`720px`} /> </div> </div> ) } export default DrawingSEC 菜单为DrawSec: import React from "react"; import "./App.css"; ...
React Native Canvas 是一个用于在 React Native 应用中进行绘图的组件。它允许开发者使用 HTML5 Canvas API 来绘制图形、文字、图像等。Canvas 组件在 React Native 中是通过react-native-canvas库实现的。 相关优势 灵活性:使用 Canvas 可以绘制复杂的图形和动画,提供了极大的灵活性。
A simple yet powerful canvas-drawing component for React (Demo) Installation Install via NPM: npm install react-canvas-draw --save or YARN: yarn add react-canvas-draw Usage import React from "react"; import ReactDOM from "react-dom"; import CanvasDraw from "react-canvas-draw"; ReactDO...