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martinez-rueda's Introduction

Martinez-Rueda polygon boolean operations algorithm

PHP implementation of original algorithm http://www4.ujaen.es/~fmartin/bool_op.html

Algorithm is used for computing Boolean operations on polygons:

  • union
  • difference
  • intersection
  • xor

Usage

Input parameter is a multipolygon - an array of polygons. And each polygon is an array of points x,y.

   TODO

Some visual examples

Let's consider two polygons: green multipolygon of two polygons and yellow polygon.

Snow-white polygon is result of Boolean operation on two polygons.

Union

Difference (green NOT yellow)

Intersection

Xor

martinez-rueda's People

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martinez-rueda's Issues

orb.Polygon intersection example

Heya, your lib looks great but I'm struggling to figure out how to use it...

I have two orb.Polygon geometries which I'd like to generate the intersection of.
Do you possibly have an example of how I can achieve this using your lib?

From the code it looks like I can convert each orb.Loop to a martinez_rueda.Contour and then construct a martinez_rueda.Polygon which I can use with martinez_rueda.Compute() to generate the intersection and then reverse the process to convert back to an orb.Polygon?

Are there any gotchas I should be aware of such as whether the orb.Point values in the martinez_rueda.Contour should be closed (ie the first point should/should not be repeated as the last point) and whether winding order is important?

Thanks!

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