Add Hover Effect to Line Graph Lines

[GeorgeBerdovskiy]

Background

Due to PR #34, PureChart finally supports line graphs! However, they are a little too simple right now. While another contributor works on rendering the axis (#35) we want to simultaneously add some fancy effects and interactivity.

Goal

When hovering over a line (represented by a path element), it should "glow" with the same color but at around 75% transparency. To achieve this, you may need to

• Look at the pie chart code for guidance,
• Modify the code in the line_graph helper method, which is located in purechart/chart_helper.rb
• Create a view in app/views, most likely called _line_graph.html.erb

This list isn't exhaustive, and it's also not required - if you can accomplish something similar to the picture below, that's all that matters! Good luck 😎

[nathancbao]

I’ll try this one!