Animated growing pie chart with Rapahel JS

This is my first post after a long gap – almost one year. During this period I got busy with my regular work, family and other commitments. It was really hard to keep writing although I wanted to do that.
One of the tasks that I worked on a few months back was animating a pie chart as if it is growing from 0 to 360 degrees. And this post will share that with you. So let’s get started….
You might already be knowing that Raphael JS is a great JavaScript library to work with SVG in your web projects. So did I to create the pie chart. I am using Raphael and its features to create the pie chart and animate it. Here’s the demo link. Run this in your browser http://jsphkhan.github.io/growing_pie/

growing_pie

Quick Concepts: 
Most important functionality in the growing pie chart code is defining a custom Raphael paper attribute. So here’s the concept. If you have an attribute that you want to represent as a function and add your logic to it, you can create a custom attribute. For details you can see the official reference here. But here’s how I defined a custom sector attribute that represents a pie slice sector.Read More »

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Controlling SVG Pie Chart with a slider control

I have already talked about creating a simple HTML5 – SVG pie chart in one of my earlier post. This time, I thought of adding some interactivity to the pie chart and came up with controlling the number of pie slices on the fly with a slider control. This tutorial will describe how to increase or decrease the number of pie slices/sectors in the pie chart by scrolling a slider control. I do not know why I tried this but this example might come to your rescue someday and then do not forget to thank me. Check out the demo,

Demo: http://jbk404.site50.net/html5/svgpie/

In Mozilla Firefox the slider control is not displayed, instead a text input is displayed. It works though, you can enter the value and press Enter to see the changes in the pie chart. Google Chrome and Safari works fine. This is how it looks in Chrome,

There is nothing much to describe here other than the code. You must have seen the demo till now. Let’s dive into the code.

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