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FabricJS β How to center a Line object horizontally on the current viewport of a canvas?
In this tutorial, we are going to learn about how to center a Line object horizontally on current viewport of canvas 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 center a Line object horizontally on current viewport of canvas, we use the viewportCenterH method.
Syntax
viewportCenterH(): fabric.Object
Default appearance of the Line object
Example
Letβs see a code example to see how our Line object looks when the viewportCenterH method is not used. In this case, the Line object will not be centered horizontally on the canvas.
<!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 line object is not centered horizontally with respect to the current viewport of canvas </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: 6, }); // Add it to the canvas canvas.add(line); </script> </body> </html>
Using the viewportCenterH method
Example
Letβs see a code example to see how the line object looks like when the viewportCenterH method is used. In this case, our line object will be centered horizontally with respect to the current viewport of the canvas.
<!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 viewportCenterH method</h2> <p> You can see that the line object is centered horizontally with respect to the current viewport of canvas </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: 6, }); // Add it to the canvas canvas.add(line); // Using the viewportCenterH method line.viewportCenterH(); </script> </body> </html>
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