GEOS SDK TechDocs| | 
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5 Coordinate Space | 
7 Working With Bitmaps The data structure known as the Graphics State, or GState, keeps track of changes your code makes about how it wants to draw things. If your geode changes its transformation, everything you draw from that point will be drawn transformed until you change the transformation again. If your geode sets the line width to two points, all lines to come will be drawn two points wide until the width is set to something else. Many graphics routines ask that you pass a GState along as one of the parameters so they know where and how to draw what you've requested.
GEOS SDK TechDocs| | | 5 Coordinate Space | 7 Working With Bitmaps