Introduction

Bool.dll is a library that performs two dimensional polygon booleans - it supports the basic operations needed when processing polygons for mask making and field analysis. These boolean operations include:

• union - combining touching or overlapping polygons into a single polygon
• difference - subtracting one polygon (or set) from another
• intersection - finding the intersection between two polygons (or sets)
• XOR - NOT the intersection of two sets.
• sizing - increasing or decreasing the size of a polygon by a specified amount
• de-embedding - sorting a collection of polygons into parent and children (for purposes of polarity calculations)

The calling program passes bool.dll a list (or two lists) of polygons, specifies the operation and parameters and then gets back a new set of polygons in memory.