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How to lock the horizontal movement of a Circle using FabricJS?
In this tutorial, we are going to learn how to lock the horizontal movement of a Circle using FabricJS. Just as we can specify the position, colour, opacity and dimension of a circle 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.Circle({ lockMovementX: Boolean }: Object)Parameters
options (optional) − This parameter is an Object which provides additional customizations to our circle. 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 Circle object in the canvas
Let's see a code to understand how we can move our circle 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>How to lock the horizontal movement of a circle using FabricJS?</h2>
<p>Here you can select the circle and move it freely, as we have not applied the <b>lockMovementX</b> property. This is the default behavior. By default, <b>lockMovementX</b> is set to False. </p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var circle = new fabric.Circle({
left: 115,
top: 50,
fill: "white",
radius: 50,
stroke: "black",
strokeWidth: 5
});
// Adding it to the canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</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 Circle object. By assigning the lockMovementX property a 'true' value, we essentially cease 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>How to lock the horizontal movement of circle using FabricJS?</h2>
<p>Select the object and try to move it horizontally. You can't do that as we have restricted the horizontal movement by setting <b>lockMovementX</b> to True. You can however move the circle in vertical direction. </p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var circle = new fabric.Circle({
left: 115,
top: 50,
fill: "white",
radius: 50,
stroke: "black",
strokeWidth: 5,
lockMovementX: true
});
// Adding it to the canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
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