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Most people do not understand the knowledge points of this article "how to use canvas in react", so the editor summarizes the following content, detailed content, clear steps, and has a certain reference value. I hope you can get something after reading this article. Let's take a look at this "how to use canvas in react" article.

In react, canvas is used to draw a variety of charts, animations, etc.; you can use the "react-konva" plug-in to use canvas, a canvas third-party library for drawing complex canvas graphics using React manipulation canvas, and provides support for element event mechanisms and drag-and-drop operations.

The operating environment of this tutorial: Windows10 system, react17.0.1 version, Dell G3 computer.

What is the use of canvas in react

Canvas is a new component of HTML5, it is like a curtain, you can use JavaScript to draw a variety of charts, animations, and so on.

Only being able to drive js scripts is a feature of Canvas.

Canvas element

Your browser does not support the canvas element.

Browsers that support canvas render only the canvas tag and ignore the alternative content. Browsers that do not support canvas render alternate content directly.

Indicates that other dom structures cannot be nested within canvas.

React-konva

Learn about the application of canvas in react. We will use the react-konva plug-in.

React-konva and react-canvas are react-related canvas third-party libraries with many stars on github. Since react-canvas has not been updated since March 17 and does not support react 16, it is no longer considered. This paper mainly introduces the use of react-konva.

React Konva is a JavaScript library for drawing complex canvas graphics using React. It allows us to manipulate canvas in the same way as DOM, and provides support for the event mechanism of elements in canvas, drag-and-drop operations.

Basic concept

Think of the entire view as a stage stage. And every layer in the stage is regarded as layer. There are many group groups in the layer layer. Draw pictures, pictures and other shape in group.

Examples are as follows

Import React, {Component} from "react"; import Konva from "konva"; import {render} from "react-dom"; import {Stage, Layer, Rect, Text} from "react-konva"; class ColoredRect extends React.Component {state = {color: "green"}; handleClick = () = > {this.setState ({color: Konva.Util.getRandomColor ()}); render () {return () }} class App extends Component {render () {return ();}} the above is about "how to use canvas in react". I believe everyone has a certain understanding. I hope the content shared by the editor will be helpful to you. If you want to know more about the relevant knowledge, please follow the industry information channel.

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