Having gone over the main strategies for initiating and diverting streams of data, let's practice the theory by creating a service to stream (aptly named)
PNG (Portable Network Graphics) images to a client. This will not be a simple file server, however. The goal is to create PNG data streams by piping the output stream of an ImageMagick convert
operation executing in a separate process into the response stream of an HTTP connection, where the converter is translating another stream of SVG (Scalable Vector Graphics) data generated within a virtualized DOM (Document Object Model) existing in the Node runtime. Let's get started.
Our goal is to use Node to generate pie charts dynamically on a server based on client requests. A client will specify some data values, and a PNG representing that data in a pie will be generated. We are going to use the D3.js library, which provides a Javascript...