How to Make Smoothed Density Maps in R
Too many points to plot often means obscured patterns in the clutter. Density maps offer a smooth alternative.
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Fill areas with varying line density to give more or less visual attention. With geographic maps, the technique is especially useful to adjust for population density.
Getting Started with Network Graphs in R
Add the vertices. Connect them with edges. Repeat as necessary.
Drawing Squares and Rectangles in R
R makes it easy to add squares and rectangles to your plots, but it gets a little tricky when you have a bunch to draw at once. The key is to break it down to the elements.