Description Details Author(s) References See Also Examples

Generate 2D Quality meshes and constrained Delaunay triangulations

This package is a wrapper of Jonathan Richard Shewchuk's Triangle
package. `triangulate`

triangulates a *Planar
Straight Line Graph* (PSLG), a collection of vertices and
segments created with `pslg`

. A mesh in the can be
created within an arbitrary closed outline and the maximum area
and minimum angle of the triangles in the mesh can be specified.

David C. Sterratt david.c.sterratt@ed.ac.uk

Jonathan Richard Shewchuk,

*Triangle: Engineering a 2D Quality Mesh Generator and Delaunay Triangulator*, in “Applied Computational Geometry: Towards Geometric Engineering” (Ming C. Lin and Dinesh Manocha, editors), volume 1148 of Lecture Notes in Computer Science, pages 203-222, Springer-Verlag, Berlin, May 1996. (From the First ACM Workshop on Applied Computational Geometry.)Jonathan Richard Shewchuk,

*Delaunay Refinement Algorithms for Triangular Mesh Generation*, Computational Geometry: Theory and Applications 22(1-3):21-74, May 2002.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 | ```
## Create an object with a concavity
p <- pslg(P=rbind(c(0, 0), c(0, 1), c(0.5, 0.5), c(1, 1), c(1, 0)),
S=rbind(c(1, 2), c(2, 3), c(3, 4), c(4, 5), c(5, 1)))
## Plot it
plot(p)
## Triangulate it
tp <- triangulate(p)
plot(tp)
## Triangulate it subject to minimum area constraint
tp <- triangulate(p, a=0.01)
plot(tp)
## Load a data set containing a hole
A <- read.pslg(file.path(system.file(package = "RTriangle"), "extdata", "A.poly"))
plot(A)
## Triangulate the PSLG
tA <- triangulate(A)
plot(tA)
## Triangulate the PSLG with triangles in which no angle
## is smaller than 20 degrees
tA <- triangulate(A, q=20)
plot(tA)
## Triangulate the PSLG with triangles in which no triangle has
## area greater than 0.001
tA <- triangulate(A, a=0.001)
plot(tA)
``` |

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