Hi,
I'm trying to do first steps with creating three-dimensional drawings
with pgf/TikZ. My first attempt was Sketch, but I really need curves,
circles and so on (while the graphs are quite simple at all).
My next step are currently the examples shown on Kjell's great
TikZ-page. Here arouses the following question. When analyzing
the example 3d-graph-model.tex by Andreas Menge I tried to
integrate a circle. But it seems that the pgftransformcm and my
definition of the circle (in line 62) don't harmonize. I'd really appreciate
it if someone can give me a hint where my mistake is.
Regards,
Juergen
% Author: Andreas Menge
\documentclass[10pt]{article}
\usepackage{tikz}
%%%<
\usepackage{verbatim}
\usepackage[active,tightpage]{preview}
\PreviewEnvironment{tikzpicture}
\setlength\PreviewBorder{5pt}%
%%%>
\begin{comment}
:Title: A simple graph-model in 3D
:slug: 3d-graph-model
A simple graph-model in 3D with a helping grid but not with a rotation of 45 degrees to avoid overlapping edges. The graph lines are drawn with a white background to visualize the ones closer to the viewer and hence improve the 3D-view. Code duplication is reduced.
\end{comment}
%transforms all coordinates the same way when used (use it within a scope!)
%(rotation is not 45 degress to avoid overlapping edges)
% Input: point of origins x and y coordinate
\newcommand{\myGlobalTransformation}[2]
{
\pgftransformcm{1}{0}{0.4}{0.5}{\pgfpoint{#1cm}{#2cm}}
}
% draw a 4x4 helper grid in 3D
% Input: point of origins x and y coordinate and additional drawing-parameters
\newcommand{\gridThreeD}[3]
{
\begin{scope}
\myGlobalTransformation{#1}{#2};
\draw [#3,step=2cm] grid (8,8);
\end{scope}
}
\tikzstyle myBG=[line width=3pt,opacity=1.0]
% draws lines with white background to show which lines are closer to the
% viewer (Hint: draw from bottom up and from back to front)
%Input: start and end point
\newcommand{\drawLinewithBG}[2]
{
\draw[white,myBG] (#1) -- (#2);
\draw[black,very thick] (#1) -- (#2);
}
% draws all horizontal graph lines within grid
\newcommand{\graphLinesHorizontal}
{
\drawLinewithBG{1,1}{7,1};
\drawLinewithBG{1,3}{7,3};
\drawLinewithBG{1,5}{7,5};
\drawLinewithBG{1,7}{7,7};
% \fill[red,opacity=0.5] (4,4) circle (1.5cm);
}
% draws all vertical graph lines within grid
\newcommand{\graphLinesVertical}
{
%swaps x and y coordinate (hence vertical lines):
\pgftransformcm{0}{1}{1}{0}{\pgfpoint{0cm}{0cm}}
\fill[red,opacity=0.5] (2,2) circle (1.5cm); <--- this circle isn't transformed <--- <--- <---
\graphLinesHorizontal;
}
%draws nodes of the grid
%Input: point of origins x and y coordinate
\newcommand{\graphThreeDnodes}[2]
{
\begin{scope}
\myGlobalTransformation{#1}{#2};
\foreach \x in {1,3,5,7} {
\foreach \y in {1,3,5,7} {
\node at (\x,\y) [circle,fill=black] {};
%this way circle of nodes will not be transformed
}
}
\end{scope}
}
\begin{document}
\pagestyle{empty}
\begin{tikzpicture}
%draws helper-grid:
\gridThreeD{0}{0}{black!50};
\gridThreeD{0}{4.25}{black!50};
%draws lower graph lines and those in z-direction:
\begin{scope}
\myGlobalTransformation{0}{0};
\graphLinesHorizontal;
%draws all graph lines in z-direction (reset transformation first!):
\foreach \x in {1,3,5,7} {
\foreach \y in {1,3,5,7} {
\node (thisNode) at (\x,\y) {};
{
\pgftransformreset
\draw[white,myBG] (thisNode) -- ++(0,4.25);
\draw[black,very thick] (thisNode) -- ++(0,4.25);
}
}
}
\end{scope}
%draws upper graph-lines:
\begin{scope}
\myGlobalTransformation{0}{4.25};
\graphLinesVertical;
\end{scope}
% draws all graph nodes:
\graphThreeDnodes{0}{0};
\graphThreeDnodes{0}{4.25};
\end{tikzpicture}
\end{document}
Fabien
"Goebel, Juergen" <juergen.goebel <at> eads.com> a écrit :
> Hi,
>
> I would really like a feature like this one:
>
> \draw (A) -|- (B);
>
> for
>
> (A) -------+
> |
> |
> |
> |
> |
> +-------- (B)
>
> and correspondingly
>
> \draw (A) |-| (B);
>
> for
>
> (A)
> |
> |
> +--------------------+
> |
> |
> (B)
>
> Is this possible?
>
> Regards,
>
> Juergen
>
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