/usr/share/octave/packages/geometry-1.7.0/geom2d/readme.txt is in octave-geometry 1.7.0-1build1.
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%% 2007-2011, David Legland <david.legland@grignon.inra.fr>
%% 2011 Adapted to Octave by Juan Pablo Carbajal <carbajal@ifi.uzh.ch>
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Description of the geom2d library.
The aim of geom2d library is to handle and visualize geometric primitives such
as points, lines, circles and ellipses, polylines and polygons... It provides
low-level functions for manipulating geometrical primitives, making easier the
development of more complex geometric algorithms.
Some features of the library are:
- creation of various shapes (points, circles, lines, ellipses, polylines,
polygons...) through an intuitive syntax.
Ex: createCircle(p1, p2, p3) to create a circle through 3 points.
- derivation of new shapes: intersection between 2 lines, between line and
circle, between polylines... or point on a curve from its parametrisation
- functions for polylines and polygons: compute centroid and area, expand,
self-intersections, clipping with half-plane...
- manipulation of planar transformation. Ex.:
ROT = createRotation(CENTER, THETA);
P2 = transformPoint(P1, ROT);
- direct drawing of shapes with specialized functions. Clipping is performed
automatically for infinite shapes such as lines or rays. Ex:
drawCircle([50 50 25]); % draw circle with radius 25 and center [50 50]
drawLine([X0 Y0 DX DY]); % clip and draw straight line
- measure distances (between points, a point and a line, a point and a group
of points), angle (of a line, between 3 points), or test geometry (point
on a line, on a circle).
Additional help is provided in geom/Contents.m file, as well as summary files
like 'points2d.m' or 'lines2d.m'.
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