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How to lock the horizontal movement of a Triangle using FabricJS?
In this tutorial, we are going to learn how to lock the horizontal movement of a Triangle using FabricJS. Just as we can specify the position, colour, opacity and dimension of a Triangle object in the canvas, we can also specify whether we want it to move only in the Y-axis. This can be done by using the lockMovementX property.
Syntax
new fabric.Triangle({ lockMovementX: 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 lockMovementX is a property.
Options Keys
lockMovementX This property accepts a Boolean value. If we assign it a 'true' value, then the object will no longer be able to move in the horizontal direction.
Example 1
Default behaviour of a Triangle object in the canvas
Let's see a code example to understand how we can move our triangle object in the X-axis or the Y-axis freely when lockMovementX property is not assigned a 'true' value.
<!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 behaviour of a Triangle object in the canvas</h2>
<p>Select and drag the triangle around to see that its movement in both X-direction and Y-direction is feasible.</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: 105,
top: 70,
width: 90,
height: 80,
fill: "#ffc1cc",
stroke: "#fbaed2",
strokeWidth: 5,
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html>
Example 2
Passing lockMovementX as key with 'true' value
In this example, we will see how we can lock the horizontal movement of a triangle object. By assigning the lockMovementX property a 'true' value, we essentially cease its movement in the horizontal direction.
<!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 lockMovementX as key with 'true' value</h2>
<p>Select the triangle and drag it around to see that its movement in the X-direction is no longer allowed.</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: 105,
top: 70,
width: 90,
height: 80,
fill: "#ffc1cc",
stroke: "#fbaed2",
strokeWidth: 5,
lockMovementX: true,
});
// Add it to the canvas
canvas.add(triangle);
</script>
</body>
</html>
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