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How to scale a Line object to a given height using FabricJS?
In this tutorial, we are going to learn how to scale a Line object to a given height using FabricJS. A Line element is one of the basic elements provided in FabricJS. It is used for creating straight lines. Because line elements are geometrically one-dimensional and do not contain an interior, they are never filled. We can create a line object by creating an instance of fabric.Line, specifying the x and y coordinates of the line and adding it to the canvas. In order to scale a Line object to a given height we use the scaleToHeight method.
Syntax
scaleToHeight(value: Number, absolute: Boolean): fabric.Object
Parameters
value − This parameter accepts a Number which determines the new height value of our line object.
absolute − This parameter accepts a Boolean value which determines whether the viewport is to be ignored or not.
Default appearance of the Line object
Example
Let’s see a code example to see how our line object looks when the scaleToHeight method is not used. In this case, our line object will not be scaled in horizontal or vertical 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>Default appearance of the Line object</h2> <p> You can see that the object has not been scaled in horizontal or vertical direction </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, }); // Add it to the canvas canvas.add(line); </script> </body> </html>
Passing the scaleToHeight method with a custom value
Example
In this example, we will see how assigning a value to the scaleToHeight method scales our line object to a given height. Since we have passed the value as 100, that will be the new height of our line object.
<!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>Passing the scaleToHeight method with a custom value</h2> <p>You can see that the new height of our line object is 100</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, }); // Using scaleToHeight method line.scaleToHeight(100, false); // Add it to the canvas canvas.add(line); </script> </body> </html>
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