DIST_PLOT
Contour Plots of Distance Function
DIST_PLOT
is a MATLAB program which
creates a color contour plot of the distance function, as used in Strang and
Persson's DISTMESH program.
Usage:
dist_plot ( p, t, @fd )
where

p, a list of node coordinates;

t, a list of node indices forming a triangulation of the nodes;

@fd, points to a distance function d = fd ( p )
which computes the distance d from the region to any
point p.
Licensing:
DIST_PLOT is based in part on DISTMESH, which
is Copyright (C) 2004 PerOlof Persson.
This program is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2 of the License, or (at your
option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
59 Temple Place  Suite 330, Boston, MA 021111307, USA.
If you use DISTMESH in any program or publication, please
acknowledge its authors by citing the reference.
Languages:
DIST_PLOT is available in
a MATLAB version.
Related Data and Programs:
DISTMESH,
a MATLAB program which
is Strang and Persson's code for generating meshes over regions
with an associated distance function.
dist_plot_test
LEVELS,
a MATLAB library which
makes a contour plot, choosing the contour levels using random sampling.
TABLE_IO,
a MATLAB library which
reads and writes files
using the TABLE format; these routines are used by
DIST_PLOT_DEMO when reading the input files.
TEST_TRIANGULATION,
a MATLAB library which
defines some test regions for triangulation.
TRIANGULATION_ORDER3,
a data directory which
discusses order 3 triangulations;
The node and triangle files input to DIST_PLOT are an example
of such triangulations.
TRIANGULATION_PLOT,
a MATLAB program which
can make a plot of a triangulation.
TRIANGLE,
a C program which
can triangulate a region.
Reference:

http://math.mit.edu/~persson/mesh
PerOlof Persson's web site.

PerOlof Persson, Gilbert Strang,
A Simple Mesh Generator in MATLAB,
SIAM Review,
Volume 46, Number 2, June 2004, pages 329345.
Source Code:

dcircle.m
returns the signed distance of one or more points to a circle.

ddiff.m
returns the signed distance of one or more points to a region
defined as the set difference of two regions.

dexpr.m
computes the signed distance for a general implicit expression.

dintersect.m
returns the signed distance to a region that is the intersection
of two regions.

dist_plot.m
displays a plot of the distance function over the region.

dpoly.m
returns the signed distance of one or more points to a polygon.

drectangle.m
returns the signed distance of one or more points to a rectangle.

dsegment.m
returns the signed distance
of one or more points to a set of line segments.

dsegment.dll
(binary file), a Windows DLL file, returns the signed distance
of one or more points to a set of line segments. This version
is faster than the Mfile.

dunion.m
returns the signed distance to a region that is the union of
two regions.

file_column_count.m
counts the number of columns in a table file.

file_row_count.m
counts the number of rows in a table file.

i4mat_data_read.m
reads the data of an I4MAT file.

i4mat_header_read.m
reads the header of an I4MAT file.

i4mat_read.m
reads an I4MAT file.

i4mat_write.m
writes an I4MAT file.

protate.m
rotates a set of points by a given angle.

pshift.m
shifts a set of points by a given increment.

r8mat_data_read.m
reads the data of an R8MAT file.

r8mat_header_read.m
reads the header of an R8MAT file.

r8mat_write.m
writes an R8MAT file.

s_len_trim.m
returns the length of a string to the last nonblank.

s_word_count.m
counts the number of "words" in a string.

timestamp.m
prints the current YMDHMS date as a timestamp.
Last revised on 08 January 2019