millerjv@rigel.crd.ge.com (Jim V Miller) (07/31/90)
I am looking for a reference on filling a polygon with a "cross-hatch" pattern. Specifically I am looking to emulate HP-GL's fill patterns. These patterns are composed of lines oreinted in various directions. I need a method to "fill" arbitrary polygons with this fill pattern (the patterns change during execution based on user-defined scale, etc). To make the problem even more difficult, I would like to break the polygon into several horizontal slabs and fill each one separately. I suppose I could perform the fill operation on each slab and clip appropriately, but I would prefer not. Incidently, the motivation for splitting the polygon into horizontal slabs is that we are rasterizing a vector scene which will be dumped to a printer. Our computers do not have enough memory to hold the entire raster image in memory. Also, what is the status of HP-GL in terms of public domain, copyrights, patents, licenses, etc. This is for a HP-GL interpreter and I would like to know what sort of arrangements (in any) would have to be made to market such a beast. I have been basing the interpreter on the "Colorpro Programmer's Manual". Thanks. -- Jimmy Miller General Electric Corporate Research and Developement: millerjv@crd.ge.com Rensselaer Design Research Center (RPI): jvmiller@rdrc.rpi.edu "All I need is room to play."