Check out a free preview of the full Interactive Data Visualization with D3.js course:
The "Creating the Brush" Lesson is part of the full, Interactive Data Visualization with D3.js course featured in this preview video. Here's what you'd learn in this lesson:

Ian ports the Brush code from Tributary into the application. During the port, he strips out any of the data calls and adjusts the sizing to be based on the chart's parameters.

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