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What js do you need to introduce to use canvas?

百草Original: 2023-08-21 10:42:411461browse

To use canvas, you need to introduce the "canvas.js" js file, and also need to introduce the Canvas API in the HTML file and JavaScript file. The HTML file is used to create Canvas elements, and the JavaScript file is used to introduce the Canvas API and draw graphics. Wait for operations.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

Using Canvas requires the introduction of the following JavaScript files:

HTML file: A tag needs to be included in the HTML file to create the Canvas element. The sample code is as follows:

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  b2386ffb911b14667cb8f0f91ea547a7Canvas Example6e916e0f7d1e588d4f442bf645aedb2f
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  b4da519db76d410d9c151835a262cc8dc2caaf3fc160dd2513ce82f021917f8b
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This HTML code will create a Canvas element with a width of 800 pixels and a height of 600 pixels, and its id attribute is "myCanvas".

JavaScript file: The Canvas API needs to be introduced into the JavaScript file for operations such as drawing graphics and handling user interaction. There are many ways to introduce JavaScript files into HTML files. You can use the 3f1c4e4b6b16bbbd69b2ee476dc4f83a tag to embed it directly, or you can use an external file to introduce it. The sample code is as follows:

<!DOCTYPE html>
<html>
<head>
  <title>Canvas Example</title>
  <script src="canvas.js"></script>
</head>
<body>
  <canvas id="myCanvas" width="800" height="600"></canvas>
</body>
</html>

This code introduces a JavaScript file named "canvas.js".

JavaScript file content: In the imported JavaScript file, you can use the Canvas API for graphics drawing, event processing and other operations. The sample code is as follows:

window.onload = function() {
  var canvas = document.getElementById("myCanvas");
  var ctx = canvas.getContext("2d");
  // 在Canvas上绘制一个矩形
  ctx.fillStyle = "red";
  ctx.fillRect(50, 50, 200, 100);
  // 绘制一条直线
  ctx.strokeStyle = "blue";
  ctx.lineWidth = 5;
  ctx.beginPath();
  ctx.moveTo(100, 200);
  ctx.lineTo(300, 200);
  ctx.stroke();
};

This code uses the Canvas API to draw a red rectangle and a blue straight line on the Canvas.

To sum up, using Canvas requires introducing HTML files, JavaScript files, and the Canvas API in JavaScript files. HTML files are used to create Canvas elements, and JavaScript files are used to introduce the Canvas API and perform graphics drawing and other operations.

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