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How to create a canvas with a help cursor using FabricJS?
In this article, we are going to create a canvas with a help cursor using FabricJS. The question mark in a help pointer indicates that useful information for the user is present. It is also often accompanied by useful links and can be seen while using a new application. help is one of the native cursor style available which can be used in the FabricJS canvas too.
FabricJS provides various types of cursors like default, all-scroll, crosshair, col-resize, row-resize, etc., that reuse the native cursor under the hood. Each of these cursors look slightly different based on operating system.
Syntax
new fabric.Canvas(element: HTMLElement|String, { defaultCursor: String }: Object)
Parameters
-
element ? This parameter is the <canvas> element itself which can be derived using document.getElementById() or the id of the <canvas> element itself. The FabricJS canvas will be initialized on this element.
-
options (optional) ? This parameter is an Object which provides additional customizations to our canvas. Using this parameter color, cursor, border width and a lot of other properties can be changed related to the canvas, of which defaultCursor is a property with which we can set the type of cursor that we want.
Example 1: Basic Help Cursor
The defaultCursor property accepts a String which determines the name of the cursor to be used on the canvas. We will set it to help to use the help cursor. Let's see a code to create a canvas with a help cursor in FabricJS.
<!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>Canvas with a help cursor using FabricJS</h2>
<p>Bring the cursor inside the canvas to see the changed shape of cursor</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas", {
defaultCursor: "help"
});
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Example 2: Help Cursor with Circle Object
In this example, we will add a circle to the canvas along with the help cursor to demonstrate how the cursor appears when interacting with objects.
<!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>Canvas with help cursor using FabricJS</h2>
<p>Here we have added a circle to the canvas along with a help cursor</p>
<canvas id="canvas"></canvas>
<script>
// Initiate a canvas instance
var canvas = new fabric.Canvas("canvas", {
defaultCursor: "help"
});
// Initiate a Circle instance
var circle = new fabric.Circle({
radius: 50,
fill: "green",
left: 100,
top: 50
});
// Render the circle in canvas
canvas.add(circle);
canvas.setWidth(document.body.scrollWidth);
canvas.setHeight(250);
</script>
</body>
</html>
Key Points
- The help cursor displays a question mark pointer, indicating interactive help is available
- The
defaultCursorproperty is set during canvas initialization - This cursor is useful for tutorial modes or help sections in applications
- The appearance may vary slightly across different operating systems
Conclusion
The help cursor in FabricJS provides a clear visual indication to users that assistance or additional information is available. By setting the defaultCursor property to "help", you can enhance user experience in educational or tutorial applications.
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