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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. When set to
true, the triangle appears upside down compared to its default orientation.
Example 1: flipY set to false (Default Orientation)
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>Triangle with flipY: false</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(400);
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: flipY set to true (Vertically Flipped)
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 with a true value to the triangle object, it flips vertically and thus we see that the triangle appears upside down.
<!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>Triangle with flipY: true</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(400);
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>
Key Points
The
flipYproperty only affects the vertical orientation of the triangleSetting
flipY: falsemaintains the default triangle orientation (pointing upward)Setting
flipY: trueflips the triangle vertically (pointing downward)The flip transformation affects the entire triangle including its fill and stroke properties
Conclusion
The flipY property in FabricJS provides a simple way to flip triangle objects vertically. By setting it to true, you can easily create downward-pointing triangles without manually adjusting coordinates.
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