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How to set the position of a Circle from left using FabricJS?
In this tutorial, we are going to learn how to set the position of a Circle from left using FabricJS. Circle is one of the various shapes provided by FabricJS. In order to create a circle, we have to create an instance of fabric.Circle class and add it to the canvas. We can manipulate a circle object by changing its position, opacity, stroke and also its dimension. The position from left can be changed by using the left property.
Syntax
new fabric.Circle({ left: Number })
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 left is a property.
Options Keys
-
left ? This property accepts a Number which sets the left position of an object. The value determines how far from left the object will be placed.
Example 1: Default placement of the circle object
Let's see a code example to understand the default placement of a circle object in the canvas when its position has not been changed.
<!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>Setting the position of Circle from left using FabricJS</h2>
<p>This is the default placement of the circle. Here we have not used the <b>left</b> property.</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var circle = new fabric.Circle({
fill: "white",
radius: 100,
stroke: "yellow",
strokeWidth: 3
});
// Adding it to the canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Example 2: Passing left property as key
In this example, we are assigning the left property with a custom value. Since it accepts a Number, you must assign it a numerical value which will represent its position from the left.
<!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>Setting the position of Circle from left using FabricJS</h2>
<p>Here we have used the <b>left</b> property and assigned it a custom value to set the position of the circle from left.</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas");
var circle = new fabric.Circle({
left: 115,
fill: "white",
radius: 100,
stroke: "yellow",
strokeWidth: 3,
});
// Adding it to the canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Key Points
The
leftproperty accepts a numerical value in pixels.Without specifying
left, the circle will be placed at the default position (usually starting from the left edge).Higher values move the circle further to the right on the canvas.
The position is measured from the left edge of the canvas to the left edge of the object.
Conclusion
The left property in FabricJS allows precise control over horizontal positioning of circle objects. By setting different numerical values, you can place circles at any desired position from the left edge of the canvas.
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