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FabricJS - How to set the zoom multiplier in the URL string of a Line object?
FabricJS - How to set the zoom multiplier in the URL string of a Line object?
In this tutorial, we will learn how to set the zoom multiplier in the URL string of a Line object using FabricJS. Line element is one of the basic elements provided in FabricJS. It is used to create straight lines. Since line elements are geometrically one-dimensional and contain no interiors, they are never filled. We can create a line object by creating a fabric.Line instance, specifying the x and y coordinates of the line and adding it to the canvas. To set the zoom multiplier in the URL string of the Line object, we use the multiplier property.
grammar
toDataURL({ multiplier: Number }: Object): String
parameter
Options (optional) - This parameter is an object that provides additional customization for the URL representation of the Line object. Height, quality, format, and many other properties can be changed using this parameter, where multiplier is a property.
Option key
multiplier - This property accepts a Number value that represents the multiplier by which the final Line output image is scaled. The default value is 1.
Do not use multiplierAttribute
Example
Let's look at a code example to see the output image when not using the multiplier attribute. Once we open the console from the dev tools, we can see the URL representation of the Line object. We can copy the URL and paste it into the address bar of a new tab to see the final output. Since we are not using the multiplier attribute, the default multiplier value will be used, which is 1.
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
<h2>Without using the multiplier property</h2>
<p>
You can open console from dev tools and see the output URL. You can copy that and paste it in the address bar of a new tab to see the image.
</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiate a Line object
var line = new fabric.Line([200, 100, 100, 40], {
stroke: "blue",
strokeWidth: 20,
angle: 70,
});
// Add it to the canvas
canvas.add(line);
// Using the toDataURL method
console.log(line.toDataURL());
</script>
</body>
</html>
Use MultiplierProperties
Example
Let's look at a code example to see what the final output image of a Line object looks like when using the multiplier property. In this case, we passed it a value of 2. So the final image will be scaled twice in the x and y directions.
<!DOCTYPE html>
<html>
<head>
<!-- Adding the Fabric JS Library-->
<script src="https://cdnjs.cloudflare.com/ajax/libs/fabric.js/510/fabric.min.js"></script>
</head>
<body>
<h2>Using the multiplier property</h2>
<p>
You can open console from dev tools and see the output URL. You can copy that and paste it in the address bar of a new tab to see the image.
</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
// Initiate a Line object
var line = new fabric.Line([200, 100, 100, 40], {
stroke: "blue",
strokeWidth: 20,
angle: 70,
});
// Add it to the canvas
canvas.add(line);
// Using the toDataURL method
console.log(line.toDataURL({ multiplier: 2 }));
</script>
</body>
</html>
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