r - How do I change the polygon fill color and border color for SpatialPolygons objects? - Geographic Information Systems Stack Exchange

I have SpatialPolygons or SpatialPolygonsDataFrames which I'd like to plot. How do I change the color using the three plotting systems in R (base graphics, lattice graphics, and ggplot2)? Example

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r - ggplot2 - how to fill nested polygons with colour? - Stack Overflow

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r - SpatialPolygonDataFrame plotting using ggplot - Stack Overflow

r - Improving positioning of map / polygon labels - Stack Overflow

qgis - Changing polygon boundary thickness/color - Geographic Information Systems Stack Exchange

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