#### Filter Results:

- Full text PDF available (7)

#### Publication Year

2000

2004

- This year (0)
- Last 5 years (0)
- Last 10 years (0)

#### Publication Type

#### Co-author

#### Journals and Conferences

#### Key Phrases

Learn More

- Sergio Cabello, Yuanxin Liu, Andrea Mantler, Jack Snoeyink
- Symposium on Computational Geometry
- 2002

In this paper we present an efficient algorithm to test if two given paths are homotopic; that is, whether they wind around obstacles in the plane in the same way. For simple paths specified by <i>n</i> line segments with obstacles described by <i>n</i> points, our algorithm runs in <i>O</i>(<i>n</i> log <i>n</i>) time, which we show is tight. For… (More)

- Andrea Mantler, Jack Snoeyink
- JCDCG
- 2000

A common geometric problem in computer graphics and geographic information systems is to compute the arrangement of a set of n segments that can be colored red and blue so that there are no red/red or blue/blue crossings. We give a sweep algorithm that uses the minimum arithmetic precision and runs in optimal O(n logn + k) time and O(n) space to output an… (More)

- Lutz Kettner, David G. Kirkpatrick, Andrea Mantler, Jack Snoeyink, Bettina Speckmann, Fumihiko Takeuchi
- Comput. Geom.
- 2001

We show that every set of n points in general position has a minimum pseudo-triangulation whose maximum vertex degree is five. In addition, we demonstrate that every point set in general position has a minimum pseudo-triangulation whose maximum face degree is four (i.e. each interior face of this pseudo-triangulation has at most four vertices). Both degree… (More)

- Marshall W. Bern, Erik D. Demaine, David Eppstein, Eric Kuo, Andrea Mantler, Jack Snoeyink
- Comput. Geom.
- 2003

Unfolding a convex polyhedron into a simple planar polygon is a well-studied problem. In this paper, we study the limits of unfoldability by studying nonconvex polyhedra with the same combinatorial structure as convex polyhedra. In particular, we give two examples of polyhedra, one with 24 convex faces and one with 36 triangular faces, that cannot be… (More)

- Andrea Mantler, Jack Snoeyink
- CCCG
- 2004

Finding a combinatorial test for rigidity in 3D is an open problem. We prove that vertex connectivity cannot be used to construct such a test by describing a class of mechanisms that increase the vertex connectivity of flexible graphs to 5. Our result is tight, as minimally rigid graphs in 3D can be at most 5-connected.

- Hans W. Guesgen, Joachim Hertzberg, Richard Lobb, Andrea Mantler
- Spatial Cognition & Computation
- 2003

In this paper, we show how standard GIS operations like the complement, union, intersection, and buffering of maps can be made more flexible by using fuzzy set theory. In particular, we present a variety of algorithms for operations on fuzzy raster maps, focusing on buffer operations for such maps. Furthermore, we show how widely-available special-purpose… (More)

- Andrea Mantler, Jack Snoeyink
- CCCG
- 2001

We present a planar convex hull algorithm, Heaphull, whose main data structure is a kinetic heap. We can limit the number of times a point needs to move up in the heap to establish that O(n lg n) heap operations are sufficient; the event queue for the kinetic structure brings the running time to O(n lg n). We also report on experiments.

- Andrea Mantler, Helen Cameron
- Int. J. Found. Comput. Sci.
- 2002

- ‹
- 1
- ›