Now let's apply what we have learned about mouse event handling to create an interactive bar graph. Mouse events on a bar chart can provide useful contextual information to the person interacting with the graph.

The data for the examples will use a stripped-down version of the life expectancy vs fertility dataset that was used in earlier chapters. This dataset will use the data for the Latin American and Caribbean economic regions only, which contain roughly 35 countries, for the year 2013.

The bars in the examples will represent the longevity, will be annotated at the top with the country code, and have vertically oriented text representing the actual longevity value and the full country name. The examples will omit axes and margins to keep things simple.

The code and live example for this example is available at the following location:

This interaction pattern can be used to visually accentuate a particular bar...