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How to set the minimum allowed scale value of Rectangle using FabricJS?
In this tutorial, we are going to learn how to set the minimum allowed scale of Rectangle using FabricJS. Rectangle is one of the various shapes provided by FabricJS. In order to create a rectangle, we will have to create an instance of fabric.Rect class and add it to the canvas.
We can customize a rectangle object by adding a fill colour to it, eliminate its borders or even make changes in its dimensions. Similarly, we can also set its minimum allowed scale by using the minScaleLimit property.
Syntax
new fabric.Rect({ minScaleLimit : Number }: Object)Parameters
Options (optional) − This parameter is an Object which provides additional customizations to our rectangle. Using this parameter, properties such as colour, cursor, border width and a lot of other properties can be changed related to the object of which minScaleLimit is a property.
Options keys
minScaleLimit − This property allows us to control the minimum allowed scale value of a rectangle. It accepts a Number as a value.
Example 1
Default appearance of the rectangle object
Let’s see a code example to see how our rectangle object looks like when the minScaleLimit property is not used. In this case, we will be able to freely scale our object since there is no minimum limit set.
<!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 appearance of the rectangle object</h2>
<p>You can try scaling the rectangle to see that there is no minimum allowed scale value.</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 rectangle object
var rect = new fabric.Rect({
left: 155,
top: 90,
width: 170,
height: 70,
fill: "#6f2da8",
padding: 9,
stroke: "#b666d2",
strokeWidth: 5,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>Example 2
Passing the minScaleLimit property as key with a custom value
In this example, we will see how assigning a value to the minScaleLimit property changes the minimum allowed scale value of the rectangle object in our canvas. Here we have used 0.8 as value which means we will not be able to scale down our object lesser than a width of 136px and a height of 56px which is calculated by radius * limit (0.8 * 170 = 136px, 0.8 * 70 = 56px).
<!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 minScaleLimit property as key with a custom value</h2>
<p>You can try scaling the rectangle and observer that it isn't possible to scale down the rectangle lesser than a width of 136px and height of 56px.</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 rectangle object
var rect = new fabric.Rect({
left: 155,
top: 90,
width: 170,
height: 70,
fill: "#6f2da8",
padding: 9,
stroke: "#b666d2",
strokeWidth: 5,
minScaleLimit: 0.8,
});
// Add it to the canvas
canvas.add(rect);
</script>
</body>
</html>
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