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How to set the angle of a Line in FabricJS?
In this tutorial, we are going to learn about how to set the angle of a Line object 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 set the angle of a line object we use the angle property.
Syntax
new fabric.Line( points: Array , { angle: Number }: Object)
Parameters
points − This parameter accepts an Array of points which determines the (x1, y1) and (x2, y2) values, those being the x- and y-axis coordinates of the start and end of the line respectively.
options (optional) − This parameter is an Object which provides additional customizations to our Line object. Using this parameter stroke, corner colour, origin and a lot of other properties can be changed related to the Line object of which angle is a property.
Options Keys
angle − This property accepts a Number that determines the angle of rotation of an object in degrees.
Default appearance of Line object
Example
Let’s see a code example of how the Line object appears when the angle property is not used.
<!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 Line object</h2> <p> You can see the default appearance of line object </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>
Using the angle property
Example
In this example, we have used the angle property and assigned it a value of 60. This will make sure that our Line object has an angle of rotation of 60 degrees.
<!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 angle property</h2> <p> You can see the angle of rotation is 60 degrees </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: 60 }); // Add it to the canvas canvas.add(line); </script> </body> </html>
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