# defining Style of flowchart tikz

I have been trying to define styles to make a good block flowchart in TikZ package, but I'm not very good at it, could you make one with a combination of blue, cyan and green? I need to describe the process of solving a pair of differential equations. I have this in the preamble:

\usepackage{tikz}
\usetikzlibrary{%
decorations.pathreplacing,%
decorations.pathmorphing,%
arrows,
shapes,
shapes.geometric
}
\tikzstyle{stress} = [-latex]
\tikzstyle{dim}    = [latex-latex]
\tikzstyle{axis}   = [-latex,black!55]
\tikzstyle{startstop} = [rectangle, rounded corners, minimum width=3cm, minimum height=1cm,text centered, draw=black, fill=red!30]
\tikzstyle{io} = [trapezium, trapezium left angle=70, trapezium right angle=110, minimum width=3cm, minimum height=1cm, text centered, draw=black, fill=blue!30]
\tikzstyle{process} = [rectangle, minimum width=4cm, minimum height=1cm, text centered, text width=4cm, draw=black, fill=orange!30]
\tikzstyle{decision} = [diamond, minimum width=3cm, minimum height=1cm, text width=3cm, text centered, draw=black, fill=green!30]
\tikzstyle{arrow} = [thick,->,>=stealth]


One of the flowcharts I do is this

\begin{center}
\begin{tikzpicture}[node distance=3cm]
\node (start) [startstop] {Dada una EDO de $1^{er}$ orden};
\node (dec1) [decision, below of=start,yshift=-1cm] {¿Es de la forma $\frac{dy}{dx}=f(x)\cdot g(y)$?};
\node (pro1a) [process, right of=dec1, xshift=2cm] {Emplee una sustitución $u$, tal que $\frac{du}{dx}=G(u)F(x)$ y siga el caso como si:};
\node (pro1b) [process, below of=dec1,yshift=-1cm] {Transforme en $\frac{dy}{g(y)}=f(x)dx$};
\node (pro2) [process, below of=pro1b] {Integre};
\node (end) [startstop, below of=pro2] {$H(y)=T(x)+C$, Solución general};
\draw [arrow] (start) -- (dec1);
\draw [arrow] (dec1) -- node[anchor=east] {sí} (pro1b);
\draw [arrow] (dec1) -- node[anchor=south] {no} (pro1a);
\draw [arrow] (pro1a) |- (pro1b);
\draw [arrow] (pro1b) -- (pro2);
\draw [arrow] (pro2) -- (end);
\end{tikzpicture}
\end{center}


and I get this:

I've been watching and these styles have caught my attention

-
Welcome to TeX.SX! Is it just the styles you need help with, are you able to setup the structure of the flowchart? If so, can you add a small compilable document (just the necessary packages and the tikzpicture) to your question? – Torbjørn T. Aug 3 '14 at 7:54

Here are some definitions of three different node set styles to get the aspect of the images you posted:

The code:

\documentclass[varwidth]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{%
decorations.pathreplacing,%
decorations.pathmorphing,%
arrows,
arrows.meta,
positioning,
shapes,
shapes.geometric
}

\definecolor{myblue1}{RGB}{0,157,209}
\definecolor{myblue2}{RGB}{161,224,255}
\definecolor{myblue3}{RGB}{216,229,245}
\definecolor{myblue4}{RGB}{0,149,229}

\tikzset{
startend1/.style={
rectangle,
rounded corners=15pt,
text width=2cm,
minimum height=1cm,
align=center,
line width=2pt,
draw=white,
font=\color{white}\sffamily,
fill=myblue1,
},
data1/.style={
trapezium,
trapezium left angle=70,
trapezium right angle=110,
text width=1.5cm,
inner ysep=17pt,
align=center,
line width=2pt,
draw=white,
font=\color{black}\sffamily,
top color=myblue2,
bottom color=myblue2!20,
},
process1/.style={
rounded corners,
text width=2.6cm,
minimum height=1.5cm,
align=center,
font=\color{white}\sffamily,
line width=2pt,
draw=white,
top color=myblue1,
bottom color=myblue1!30,
},
decision1/.style={
diamond,
text width=1.5cm,
align=center,
font=\color{white}\sffamily,
line width=2pt,
draw=white,
fill=myblue1,
},
arrow1/.style={
{Square[]}->,
myblue1,
>=stealth
},
}

\tikzset{
startend2/.style={
rectangle,
rounded corners=15pt,
text width=2cm,
minimum height=1cm,
align=center,
line width=1pt,
draw=myblue1!70!black,
font=\color{white}\sffamily,
fill=myblue1,
},
data2/.style={
trapezium,
trapezium left angle=70,
trapezium right angle=110,
text width=1.5cm,
inner ysep=17pt,
align=center,
line width=1pt,
draw=myblue1!70!black,
font=\color{black}\sffamily,
fill=myblue1,
},
process2/.style={
rounded corners,
text width=2.6cm,
minimum height=1.5cm,
align=center,
font=\color{white}\sffamily,
draw=myblue1!70!black,
line width=1pt,
fill=myblue1,
},
decision2/.style={
diamond,
text width=1.5cm,
align=center,
font=\color{white}\sffamily,
line width=1pt,
draw=myblue1!70!black,
fill=myblue1,
},
arrow2/.style={
->,
myblue1,
>=stealth
},
}

\tikzset{
startend3/.style={
rectangle,
rounded corners=15pt,
text width=2cm,
minimum height=1cm,
align=center,
line width=2pt,
font=\color{myblue1}\sffamily,
fill=myblue3,
},
data3/.style={
trapezium,
trapezium left angle=70,
trapezium right angle=110,
text width=1.5cm,
inner ysep=17pt,
align=center,
draw=myblue1,
font=\color{myblue1}\sffamily,
fill=white
},
process3/.style={
text width=2.6cm,
minimum height=1.5cm,
align=center,
font=\color{white}\sffamily,
fill=myblue4,
},
decision3/.style={
diamond,
text width=1.5cm,
align=center,
font=\color{myblue1}\sffamily,
fill=myblue3,
},
arrow3/.style={
->,
myblue1,
>=stealth
},
}

\begin{document}

\begin{tikzpicture}[node distance=1.5cm and 2cm]
\node[startend1]
(start)
{start};
\node[decision1,right=of start]
(dec)
{dec1};
\node[process1,right=of dec]
(pro)
{process};
\node[data1,below=of dec]
(data)
{data};
\coordinate[below=of data] (aux);
\node[startend1]
(end)
at (pro|-aux)
{end};

\begin{scope}[arrow1]
\draw
(start) --  (dec);
\draw
(dec) --  node[fill=white] {yes} (pro);
\draw
(dec) --  node[fill=white] {no} (data);
\draw
(pro) |- (data);
\draw
(data) |- (end);
\end{scope}
\end{tikzpicture}

\begin{tikzpicture}[node distance=1.5cm and 2cm]
\node[startend2]
(start)
{start};
\node[decision2,right=of start]
(dec)
{dec2};
\node[process2,right=of dec]
(pro)
{process};
\node[data2,below=of dec]
(data)
{data};
\coordinate[below=of data] (aux);
\node[startend2]
(end)
at (pro|-aux)
{end};

\begin{scope}[arrow2]
\draw
(start) --  (dec);
\draw
(dec) --  node[fill=white] {yes} (pro);
\draw
(dec) --  node[fill=white] {no} (data);
\draw
(pro) |- (data);
\draw
(data) |- (end);
\end{scope}
\end{tikzpicture}

\begin{tikzpicture}[node distance=1.5cm and 2cm]
\node[startend3]
(start)
{start};
\node[decision3,right=of start]
(dec)
{dec3};
\node[process3,right=of dec]
(pro)
{process};
\node[data3,below=of dec]
(data)
{data};
\coordinate[below=of data] (aux);
\node[startend3]
(end)
at (pro|-aux)
{end};

\begin{scope}[arrow3]
\draw
(start) --  (dec);
\draw
(dec) --  node[fill=white] {yes} (pro);
\draw
(dec) --  node[fill=white] {no} (data);
\draw
(pro) |- (data);
\draw
(data) |- (end);
\end{scope}
\end{tikzpicture}

\end{document}


\documentclass[varwidth,border=3pt]{standalone}
\usepackage[utf8]{inputenc}
\usepackage{tikz}
\usetikzlibrary{%
decorations.pathreplacing,%
decorations.pathmorphing,%
arrows,
arrows.meta,
positioning,
shapes,
shapes.geometric
}

\definecolor{myblue1}{RGB}{0,157,209}
\definecolor{myblue2}{RGB}{161,224,255}
\definecolor{myblue3}{RGB}{216,229,245}
\definecolor{myblue4}{RGB}{0,149,229}

\tikzset{
startend1/.style={
rectangle,
rounded corners=15pt,
text width=3cm,
minimum height=1cm,
align=center,
line width=2pt,
draw=white,
font=\color{white}\sffamily,
fill=myblue1,
},
data1/.style={
trapezium,
trapezium left angle=70,
trapezium right angle=110,
text width=1.5cm,
inner ysep=17pt,
align=center,
line width=2pt,
draw=white,
font=\color{black}\sffamily,
top color=myblue2,
bottom color=myblue2!20,
},
process1/.style={
rounded corners,
text width=4cm,
minimum height=1.5cm,
align=center,
font=\color{white}\sffamily,
line width=2pt,
draw=white,
top color=myblue1,
bottom color=myblue1!30,
},
decision1/.style={
diamond,
text width=3cm,
align=center,
font=\color{white}\sffamily,
line width=2pt,
draw=white,
fill=myblue1,
},
arrow1/.style={
{Square[]}->,
myblue1,
>=stealth
},
}

\begin{document}

\begin{tikzpicture}[node distance=1cm]
\node[startend1]
(start)
{Dada una EDO de $1^{er}$ orden};
\node[decision1,below=of start]
(dec1)
{¿Es de la forma $\frac{dy}{dx}=f(x)\cdot g(y)$?};
\node[process1, right=of dec1]
(pro1a)
{Emplee una sustitución $u$, tal que $\frac{du}{dx}=G(u)F(x)$ y siga el caso como si:};
\node[process1, below= of dec1]
(pro1b)
{Transforme en $\frac{dy}{g(y)}=f(x)dx$};
\node[process1, below=of pro1b]
(pro2)
{Integre};
\node[startend1, below=of pro2]
(end)
{$H(y)=T(x)+C$, Solución general};

\draw[arrow1]
(start) -- (dec1);
\draw[arrow1]
(dec1) -- node[anchor=east] {sí} (pro1b);
\draw[arrow1]
(dec1) -- node[anchor=south] {no} (pro1a);
\draw[arrow1]
(pro1a) |- (pro1b);
\draw[arrow1]
(pro1b) -- (pro2);
\draw[arrow1]
(pro2) -- (end);
\end{tikzpicture}

\end{document}


## Remarks

• The shadows library was used to add a drop shadow to the node shapes.

• The arrows.meta library was used to produce the arrow tips using {Square[]}->.

• Using the top color and bottom color keys the nodes were colorized using vertical shadings.

• The old and inappropriate of= syntax was replaced with =of with the help of the positioning library.

• The old \tikzstyle was replaced with the newer and more convenient \tikzset.

-
oh!!! thanks!!!! :33 – Cristian Rodríguez Aug 4 '14 at 2:52