Document Classes ⇒ Edges not dashed

[paulosousa]

Hi all,
Need some help, why [OE], [OA] e [OC] are not appearing dash?

Code: Select all

\documentclass[12pt, twoside, a4paper]{article}
\usepackage[portuguese]{babel}
\usepackage[applemac]{inputenc}
\usepackage[left=2.0cm,top=1.5cm,right=2.0cm,bottom=1.75cm]{geometry}
\usepackage{amsmath,amssymb,amsfonts,textcomp,setspace,color,graphicx, graphics}
\usepackage{pgf,tikz}

\pagestyle{empty}

\usepackage{tikz}
\usepackage{tikz-3dplot}
\usetikzlibrary{patterns}

\begin{tikzpicture}[scale=1,cm={-1,-1,1,0,(0,0)},x=3.85mm,z=-1cm]
    %draw the axes (x-axis: towards you; y-axis: to the right; z-axis: up)
    \draw[thick,->,black] (0,0,0) -- (5,0,0) node[anchor=north east]{$x$};
    \draw[thick,->] (0,0,0) -- (0,5,0) node[anchor=north east]{$y$};
    \draw[thick,->] (0,0,0) -- (0,0,6) node[anchor=east]{$z$};

	%draw the top and bottom of the parallelepiped	
	\draw[dashed] (0,0,0) -- (0,3,0);
	\draw[dashed] (0,0,0) -- (3,0,0);
	\draw[very thick] (3,0,0) -- (3,3,0);
	\draw[very thick] (0,3,0) -- (3,3,0);
	\draw[very thick] (3,0,5) -- (0,0,5);
	\draw[very thick] (0,0,5) -- (0,3,5);
	\draw[very thick] (0,3,5) -- (3,3,5);
	\draw[very thick] (3,0,5) -- (3,3,5);
	
	%draw the edges of the parallelepiped
	\draw[very thick] (0,3,0) -- (0,3,5);
	\draw[very thick] (3,0,0) -- (3,0,5);
	\draw[very thick] (3,3,0) -- (3,3,5);
	
	%draw dashed lines to represent hidden edges
	\draw[dashed] (0,0,0) -- (0,0,5);

        %nodes and edge labels
	\draw (-0.15,-0.30,0) node {O};
	\draw (2.90,-0.30,0) node {A};
	\draw (3.60,3.20,0) node {B};
	\draw (0,3.20,0.20) node {C};
	\draw (0,3.20,5.15) node {D};
	\draw (0,-0.20,5.15) node {E};
	\draw (3,-0.20,5.15) node {F};
	\draw (3,3.25,4.85) node {G};

\end{tikzpicture}

[Johannes_B]

Try the following line(s)

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        %draw dashed lines to represent hidden edges
        \draw[dashed,color=orange,ultra thick] (0,0,0) -- (0,0,5);

Do you notice something? If you are absolutely sure that you will have a white background at the end, you could just set the color of the line wo white. Ugly, but ok.

On the other hand, there might be an easier solution hidden in some library. Unfortunately, i don't know TikZ well.

[paulosousa]

Thanks a lot for the excellent idea:

this is very fine:

Code: Select all

\draw[dashed,color=white,ultra thick] (0,0,0) -- (0,0,5);

[Johannes_B]

Just to be sure, you know why the line did not appear to be dashed before?

[Stefan Kottwitz]

It was just the axis line towards z which was in the background of the dashed line, so the gaps in the dashed line showed the axis, which is black too.

Stefan