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Home  >  Article  >  Web Front-end  >  How to add default horizontal scaling to canvas type text using JavaScript?

How to add default horizontal scaling to canvas type text using JavaScript?

王林
王林forward
2023-08-24 10:45:08958browse

How to add default horizontal scaling to canvas type text using JavaScript?

We can add a default horizontal scaling for canvas type text by accessing the canvas context and setting the scale property to a specific value. This is accomplished by calling the context's zoom method and passing in the desired horizontal zoom value. By doing this, all text drawn on the canvas will have the default horizontal scaling applied.

HTMLCanvas

HTML Canvas is a 2D drawing surface that can be used to create dynamic and interactive graphics, charts, and animations on web pages. It is an HTML element that allows developers to draw graphics using JavaScript.

The canvas element is a container for graphics. You can use the canvas API to draw shapes, text, and images. It is a powerful tool that allows developers to create rich, interactive user experiences on the web without using external libraries or plug-ins.

method

To add a default horizontal scaling for canvas type text using JavaScript, you can follow these steps −

  • Create a canvas element and set its width and height.

  • Get the 2D context of the canvas by calling the getContext() method.

  • Use the fillText() method to draw text on the canvas.

  • Set the default horizontal scaling by calling the scale() method on the 2D context and passing in the scaling factor as the first argument.

  • Use the fillText() method to redraw text on the canvas.

The following is an example showing how to accomplish this task −

// Create a canvas element
var canvas = document.createElement("canvas");
canvas.width = 500;
canvas.height = 500;

// Get the 2D context of the canvas
var ctx = canvas.getContext("2d");

// Draw the text on the canvas
ctx.fillText("Hello World!", 50, 50);

// Set the default horizontal scaling
ctx.scale(1.5, 1);

// Draw the text again on the canvas
ctx.fillText("Hello World!", 50, 50);
The Chinese translation of

Example

is:

Example

<!DOCTYPE html>
<html>
<head>
   <title>Canvas Text Scaling</title>
</head>
   <body>
      <canvas id="myCanvas"></canvas>
      <script>
         // Get the canvas element by its id
         var canvas = document.getElementById("myCanvas");
         canvas.width = 500;
         canvas.height = 500;
         
         // Get the 2D context of the canvas
         var ctx = canvas.getContext("2d");
         
         // Set the font and text color
         ctx.font = "30px Arial";
         ctx.fillStyle = "black";
         
         // Draw the text on the canvas
         ctx.fillText("Hello World!", 50, 50);
         
         // Set the default horizontal scaling
         ctx.scale(1.5, 1);
         
         // Draw the text again on the canvas
         ctx.fillText("Hello World!", 50, 100);
      </script>
   </body>
</html>
The Chinese translation of

Explanation

is:

Explanation

In this example, the text "Hello World!" is drawn on the canvas with the default horizontal scaling of 1.5. This means that the text will be scaled 1.5x horizontally, making it appear wider on the canvas. The text will be drawn twice, first at normal size and second at 1.5x scaled size.

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