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How to create a string representation of a Line object using FabricJS?
How to create a string representation of a Line object using FabricJS?
In this tutorial, we will learn how to create a string representation of a Line object using FabricJS. Line element is one of the basic elements provided in FabricJS. It is used to create straight lines. Since line elements are geometrically one-dimensional and contain no interiors, they are never filled. We can create a line object by creating a fabric.Line instance, specifying the x and y coordinates of the line and adding it to the canvas. To create a string representation of a Line object, we use the toString method.
Syntax
toString(): String
Using toString Method
Example
Let’s look at a code example to see how to use toString Method is used to record the output. In this case, a string representation of the line instance is returned.
<!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>Using the toString method</h2>
<p>
You can open console from dev tools and see that the logged output contains the String representation of the line instance
</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 Line object
var line = new fabric.Line([200, 100, 100, 40], {
stroke: "blue",
strokeWidth: 20,
});
// Add it to the canvas
canvas.add(line);
// Using the toString method
console.log(
"String representation of the Line instance is: ",
line.toString()
);
</script>
</body>
</html>
Use the toString method to compare two different elements
Example
Let's look at a code example to see how to compare two objects by looking at their respective string representations. Here we initialize a line instance and a rectangle instance. As we apply the toString method to each object, we can see their respective string representations in the console.
<!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>Using toString method to compare two different elements</h2>
<p>
You can open console from dev tools and see that the logged output contains the String representation of the line instance and the rectangle instance
</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 Line object
var line = new fabric.Line([200, 100, 100, 40], {
stroke: "blue",
strokeWidth: 20,
});
// Initiate a Rectangle object
var rect = new fabric.Rect( {
stroke: "red",
strokeWidth: 20,
width:20,
height: 50,
left: 400,
top: 55
});
// Add them to the canvas
canvas.add(line);
canvas.add(rect)
// Using the toString method
console.log(
"String representation of the Line instance is: ", line.toString()
);
console.log(
"String representation of the Rectangle instance is: ",
rect.toString()
);
</script>
</body>
</html>
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