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author | Karl Berry <karl@freefriends.org> | 2014-02-27 00:01:50 +0000 |
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committer | Karl Berry <karl@freefriends.org> | 2014-02-27 00:01:50 +0000 |
commit | 90ae413a94da014dbf7a6a8ab584f7c668483a5a (patch) | |
tree | 4e0528a2b2fb2004988e7fc804ea2f1354f1f5d5 /Master/texmf-dist/tex/generic/pgf/graphdrawing/lua/pgf/gd/force/ControlSprings.lua | |
parent | 800cc56380d1edfe567a6a66bef13e8950eb2b0c (diff) |
pgf 3.0.0
git-svn-id: svn://tug.org/texlive/trunk@33057 c570f23f-e606-0410-a88d-b1316a301751
Diffstat (limited to 'Master/texmf-dist/tex/generic/pgf/graphdrawing/lua/pgf/gd/force/ControlSprings.lua')
-rw-r--r-- | Master/texmf-dist/tex/generic/pgf/graphdrawing/lua/pgf/gd/force/ControlSprings.lua | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/Master/texmf-dist/tex/generic/pgf/graphdrawing/lua/pgf/gd/force/ControlSprings.lua b/Master/texmf-dist/tex/generic/pgf/graphdrawing/lua/pgf/gd/force/ControlSprings.lua new file mode 100644 index 00000000000..2ef55169bca --- /dev/null +++ b/Master/texmf-dist/tex/generic/pgf/graphdrawing/lua/pgf/gd/force/ControlSprings.lua @@ -0,0 +1,58 @@ +-- Copyright 2012 by Till Tantau +-- +-- This file may be distributed an/or modified +-- +-- 1. under the LaTeX Project Public License and/or +-- 2. under the GNU Public License +-- +-- See the file doc/generic/pgf/licenses/LICENSE for more information + +-- @release $Header: /cvsroot/pgf/pgf/generic/pgf/graphdrawing/lua/pgf/gd/force/ControlSprings.lua,v 1.3 2013/05/23 20:01:27 tantau Exp $ + + +-- Imports +local declare = require("pgf.gd.interface.InterfaceToAlgorithms").declare + + +--- +-- @section subsubsection {Forces and Their Effects: Springs} +-- +-- The most important parameter of springs is their ``natural +-- length'', which can be configured using the general-purpose +-- |node distance| parameter. It is the ``equilibrium length'' of a +-- spring between two nodes in the graph. When an edge has this +-- lenght, no forces will ``push'' or ``pull'' along the edge. +-- +-- The following examples shows how a simple graph can be scaled by +-- changing the |node distance|: +-- \begin{codeexample}[] +-- \tikz \graph [spring layout, node distance=7mm] { subgraph C_n[n=3] }; +-- \tikz \graph [spring layout] { subgraph C_n[n=3] }; +-- \tikz \graph [spring layout, node distance=15mm]{ subgraph C_n[n=3] }; +-- \end{codeexample} +-- \begin{codeexample}[] +-- \tikz \graph [spring electrical layout, node distance=0.7cm] { subgraph C_n[n=3] }; +-- \tikz \graph [spring electrical layout] { subgraph C_n[n=3] }; +-- \tikz \graph [spring electrical layout, node distance=1.5cm] { subgraph C_n[n=3] }; +-- \end{codeexample} +-- +-- @end + + + +--- + +declare { + key = "spring constant", + type = "number", + initial = "0.01", + + summary = [[" + The ``spring constant'' is a factor from Hooke's law describing the + ``stiffness'' of a spring. This factor is used inside spring-based + algorithms to determine how strongly edges ``pull'' and ``push'' at + the nodes they connect. + "]] + } + + |