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FabricJS - How to enable retina scaling in the URL string of a Line object?
FabricJS - How to enable retina scaling in the URL string of a Line object?
In this tutorial, we will learn how to enable retina scaling in a 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 enable retina scaling in the URL string of a Line object, we use the enableRetinaScaling property. This has no effect on the image itself, but the canvas is scaled by devicePixelRatio to render better on retina screens.
Syntax
toDataURL({ enableRetinaScaling: Boolean }: Object): String Parameters
Options (optional) - This parameter is a provided Additional Custom Objects The URL representation of the Line object. Height, mass, multiplier, and many other properties can be changed using this parameter, of which enableRetinaScaling is a property.
Option Key ##enableRetinaScaling: This property accepts Boolean Value that allows us to enable retina scaling for the image.
Using the enableRetinaScaling attribute and passing it an error value
Example< h3>
Let’s look at a code example to see Output logged when using the toDataURL method without using the ##enableRetinaScaling: This property accepts Boolean Value that allows us to enable retina scaling for the image.
enableRetinaScaling 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 have passed a false value to the enableRetinaScaling property, retina scaling will not be enabled.
<!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 enableRetinaScaling property and passing it a false value</h2>
<p>
You can open console from dev console and see the URL representation with retina scaling disabled
</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({
enableRetinaScaling: false
}));
</script>
</body>
</html>
enableRetinaScaling attribute and pass it a true value
ExampleLet’s look at a code example to see when
enableRetinaScaling The property has been passed a true value. In this case, retina scaling will be enabled.
<!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 enableRetinaScaling property and passing it a true value</h2>
<p>
You can open console from dev console and see the URL representation with retina scaling enabled
</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({
enableRetinaScaling: true
}));
</script>
</body>
</html>
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