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How to flip a Triangle vertically using FabricJS?
In this tutorial, we are going to learn how we can flip a Triangle object vertically using FabricJS. Triangle is one of the various shapes provided by FabricJS. In order to create a triangle, we will have to create an instance of fabric.Triangle class and add it to the canvas. We can flip a triangle object vertically using the flipY property.
Syntax
new fabric.Triangle({ flipY: Boolean }: Object)
Parameters
Options (optional) − This parameter is an Object which provides additional customizations to our triangle. Using this parameter, properties such as colour, cursor, stroke width, and a lot of other properties can be changed related to the object of which flipY is a property.
Options Keys
flipY − This property accepts a Boolean value which allows us to flip an object vertically.
Example 1
Passing flipY as key with a 'false' value
Let's see a code example that shows us the default orientation of a triangle object in FabricJS. Since we are passing the flipY property a False value, the triangle object will not be flipped vertically.
<!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 flipY as key with a 'false' value</h2> <p>You can see that the triangle object has not been flipped vertically.</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 triangle object var triangle = new fabric.Triangle({ left: 75, top: 45, width: 180, height: 109, stroke: "#e3f988", strokeWidth: 5, flipY: false, }); // Create gradient fill triangle.set( "fill", new fabric.Gradient({ type: "linear", coords: { x1: 0, y1: 0, x2: 0, y2: 100 }, colorStops: [ { offset: 0, color: "#545a2c" }, { offset: 1, color: "#6495ed" }, ], }) ); // Add it to the canvas canvas.add(triangle); </script> </body> </html>
Example 2
Passing the flipY property as key with a 'true' value
In this example, we have a triangle object of width 180px and height 109px with a vertical linear gradient fill. As we apply the flipY property to the triangle object, it flips vertically and thus we see that the triangle has flipped as well.
<!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 flipY property as key with a 'true' value</h2> <p>You can see that the triangle object has been flipped vertically</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 triangle object var triangle = new fabric.Triangle({ left: 75, top: 45, width: 180, height: 109, stroke: "#e3f988", strokeWidth: 5, flipY: true, }); // Create gradient fill triangle.set( "fill", new fabric.Gradient({ type: "linear", coords: { x1: 0, y1: 0, x2: 0, y2: 100 }, colorStops: [ { offset: 0, color:"#545a2c" }, { offset: 1, color: "#6495ed" }, ], }) ); // Add it to the canvas canvas.add(triangle); </script> </body> </html>