Data visualization
There are several definitions for data visualization and many articles talk about how beneficial it is when it is about communicating with data. I think that old idiom "a picture is worth a 1,000 words" summarizes it better. Since we are dealing with - literally - thousands of words, lets see how we can benefit from data visualization libraries in our project in order to get the insight we have been talking about since the beginning of this chapter.
In this section, we are going to use a graph to represent clusters (centers and their articles). We can use the current template to show the graph, but instead we are going to introduce another Angular concept called child components and see how we can use other views as the children of the current view. So, as usual, let's create the blueprints first and develop them progressively as we proceed.
The modal component
When we click the Build clusters button, it does the job, but doesn't show anything back to the user. Lets keep...
