mirror of https://github.com/CGAL/cgal
57 lines
2.0 KiB
Plaintext
57 lines
2.0 KiB
Plaintext
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namespace CGAL {
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/*!
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\mainpage User Manual
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\anchor Chapter_Geomview
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\cgalAutoToc
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\authors Andreas Fabri and Sylvain Pion
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\section GeomviewDefinition Definition
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This chapter presents the \cgal interface to Geomview \cgalFootnote{http://www.geomview.org/}, which is a
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viewer for three-dimensional objects, originally developed at the Geometry
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Center in Minneapolis \cgalFootnote{http://www.geom.umn.edu/}.
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<B>Note:</B> The functionality described in this chapter is not available on Windows.
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An object of the class `Geomview_stream` is a stream in which geometric
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objects can be inserted and where geometric objects can be extracted
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from. The constructor starts Geomview either on the local either on
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a remote machine.
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Not all but most classes of the \cgal kernel have output
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operators for the `Geomview_stream`.
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2D objects are embedded in the `xy`-plane.
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Input is only provided for points.
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Polyhedron and 2D and 3D triangulations have output
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operators for the `Geomview_stream`.
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\section GeomviewImplementation Implementation
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The constructor forks a process and establishes two pipes between the
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processes. The forked process is then overlaid with Geomview. The
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file descriptors `stdin` and `stdout` of Geomview are hooked
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on the two pipes.
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All insert operators construct expressions in `gcl`, the Geomview
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command language, which is a subset of <span class="textsc">Lisp</span>. These expressions
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are sent to Geomview via the pipe. The extract operators notify `interest`
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for a certain kind of events. When such an event happens Geomview
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sends a description of the event in `gcl` and the extract operator has
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to parse this expression.
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In order to implement further insert and extract operators you should
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take a look at the implementation and at the Geomview manual.
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\section GeomviewExample Example
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The following program ouputs successively a 2D
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Delaunay triangulation (projected), a 3D Delaunay, and a terrain
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from the set of points.
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\cgalExample{Geomview/gv_terrain.cpp}
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*/
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} /* namespace CGAL */
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