Creating Svg Circles With Javascript

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In this article, we will learn how to create circles using Scalable Vector Graphics (SVG) in JavaScript. SVG is a vector graphic format that is used to display images on the web. It is an open standard developed by the World Wide Web Consortium (W3C). SVG graphics are resolution independent, meaning they can be scaled to any size without losing quality.

The SVG circle element is used to create circles on the screen. It is a basic shape that can be used to create more complex shapes, such as polygons. In this article, we will create a basic circle and then look at how we can customize it using the SVG attributes.

Defining a Circle with SVG

The SVG circle element is used to define a circle shape. It has three attributes, cx, cy and r, which define the x and y coordinates of the center of the circle, as well as the radius of the circle. The following code defines a circle with a radius of 100 pixels, centered at the point (200, 200):

We can also use the SVG path element to create a circle. The following code creates a circle with a radius of 100 pixels, centered at the point (200, 200):

Customizing a Circle with SVG

We can customize the circle by adding attributes to the SVG element. The following table lists the attributes that can be used to customize the circle:

AttributeDescription
fillThe color of the inside of the circle.
strokeThe color of the outline of the circle.
stroke-widthThe width of the outline of the circle.
opacityThe opacity of the circle.
transformThe transformation to apply to the circle.

The following code creates a circle with a filled color of red, an outline of blue, an outline width of 5 pixels, an opacity of 0.5, and a transformation of rotate(45deg):

The result of the above code is shown in the image below:

Animating a Circle with JavaScript

We can animate the circle with JavaScript. We can use the setInterval() function to call a function at regular intervals. The following code uses the setInterval() function to call the animate() function every 0.5 seconds.

setInterval(animate, 500);

The animate() function changes the cx attribute of the circle to move it across the screen. The following code moves the circle 100 pixels to the right every 0.5 seconds:

function animate() {
 var circle = document.getElementById("circle");
 var cx = parseInt(circle.getAttribute("cx"));
 cx += 100;
 circle.setAttribute("cx", cx);
 }

The result of the above code is shown in the image below:

Conclusion

In this article, we have learned how to create circles using SVG in JavaScript. We have also seen how to customize the circle and animate it with JavaScript. SVG is a powerful vector graphic format and can be used to create a variety of shapes and images on the web. Hopefully, this article has helped you understand how to work with SVG in JavaScript.