Graphics, Figures & Tables ⇒ line changing color latex tikz

[joshmccraney]

hi latex community!

So I'm drawing a picture in tikz and when I use the \shade command my lines are changing from black into the color I'm shading with. Does anyone know how to prevent this?

Thanks so much!

[Johannes_B]

Hi and welcome,

can you show us a small but compilable example so we know what you are doing? Just like a picture, a compilable example is worth a thousand words. And it saves time for helpers.

[joshmccraney]

Hi! Thanks for the welcome. Below is what I think you're asking for. Let me know if it's something different and I'll do my best to attach what you need. Thanks so much for helping!

Code: Select all

%------------------------------------------------------------
%
\documentclass{article}
%
%----------------------------------------------------------
%
\usepackage{amsmath}%
\usepackage{bm}%
\usepackage{mathtools}%
\usepackage{amsfonts}%
\usepackage{amssymb}%
\usepackage{amsthm}%
\usepackage{mathrsfs}%
\usepackage{graphicx}%
\usepackage{float}%
\usepackage{cases}%
\usepackage{tikz}%
\usepackage{epigraph}%
\usepackage{verbatim}%
\usepackage{setspace}
%
%
%------------------------------------------------------------
% Theorem like environments
%
\tikzset{>=latex}
---------
%
\begin{document}

\begin{figure}[H]
	\centering

\begin{tikzpicture}

\draw[thick,black,-] (0,0) to (5.5,0);
\draw[thick,->] (6.65,0) to (10,0);
\node[right] at (10,0) {$z$};


\draw[semithick] (5,-1.5) arc (270:90:0.5 and 1.5);% left half of the inner ellipse
\draw[semithick] (5,-1.5) arc (-90:90:0.5 and 1.5);% right half of the inner ellipse
\shade[left color=blue!5!white,right color=blue!60!white,opacity=0.7] (5,-1.5) arc (270:90:0.5 and 1.5) -- (5,-1.5) arc (-90:90:0.5 and 1.5) -- cycle; %inside cylinder

\end{tikzpicture}
		\caption{Control volume approach for energy balance.}
	\label{overflow}
\end{figure}

\end{document}

[mas]

You should remove all the unwanted stuff from the code and post a really minimum example (minimal working example). Also, you should use the code tags to input you code

The shade command uses the same color unless you specify a different color by way of draw parameter. Look at the code below to see the difference:

Code: Select all

\documentclass{standalone}
%
\usepackage{tikz}%
%
\tikzset{>=latex}
%
\begin{document}

\begin{tikzpicture}

\shade[left color=blue!5!white, right color=blue!60!white,
       opacity=0.7] 
       (5,-1.5) arc (270:90:0.5 and 1.5) -- (5,-1.5) 
       arc (-90:90:0.5 and 1.5) -- cycle; 

\begin{scope}[xshift=3cm]
\shade[left color=blue!5!white, right color=blue!60!white,
       opacity=0.7, draw=black] 
       (5,-1.5) arc (270:90:0.5 and 1.5) -- (5,-1.5) 
       arc (-90:90:0.5 and 1.5) -- cycle; 
\end{scope}

\end{tikzpicture}
[attachment=0]x.png[/attachment]
\end{document}

The output is as below:

[joshmccraney]

Sorry about not making it minimum! I'll work on doing a better job. What do you mean by "code tags"? And thanks so much for helping!

But it seems that using the "draw=black" command puts a black border around the shaded region. This is adding areas of black where I was trying to avoid (since some shaded areas were not suppose to have lines through them) and not darkening other lines passing through the shade region (it shades those lines). Any idea how to proceed?

[mas]

What do you mean by "code tags"? And thanks so much for helping!

When you are in the editing box, click on the

Code: Select all

 button at the top and paste your code snippet netween the [code]

tags.

But it seems that using the "draw=black" command puts a black border around the shaded region.

Try draw=none. Does that help? Are you trying to draw a cylinder?