I am trying to change the direction of the arrows and generally figure out how best to manipulate this diagram. I have placed my own text but I want the box with the dotted lines do have a white background and the middle box to have its left and right arrows pointing out the way. I cannot see an obvious way to do this from the code at all!

Here is the link to the code.



Simply add fill=white:

\node [force, text width=3cm, dashed, left=1cm of substitutes, fill=white] (state) {Public policies};

and reverse the edge statements

(substitutes) edge (rivalry)
%(suppliers) edge (rivalry)
(rivalry) edge  (suppliers)
%(users) edge (rivalry)
(rivalry) edge (users)
(entrants) edge (comment-rivalry);

enter image description here


% Porter model
% Author: Charles-Axel Dein

\renewcommand{\rmdefault}{bch} % change default font



[node distance = 1cm, auto,font=\footnotesize,
every node/.style={node distance=3cm},
% The comment style is used to describe the characteristics of each force
comment/.style={rectangle, inner sep= 5pt, text width=4cm, node distance=0.25cm, font=\scriptsize\sffamily},
% The force style is used to draw the forces' name
force/.style={rectangle, draw, fill=black!10, inner sep=5pt, text width=4cm, text badly centered, minimum height=1.2cm, font=\bfseries\footnotesize\sffamily}] 

% Draw forces
\node [force] (rivalry) {Rivalry among existing competitors};
\node [force, above of=rivalry] (substitutes) {Threat of substitutes};
\node [force, text width=3cm, dashed, left=1cm of substitutes, fill=white] (state) {Public policies};
\node [force, left=1cm of rivalry] (suppliers) {Bargaining power of suppliers};
\node [force, right=1cm of rivalry] (users) {Bargaining power of users};
\node [force, below of=rivalry] (entrants) {Threat of new entrants};

% Change data from here

\node [comment, below=0.25 of rivalry] (comment-rivalry) {(+) A war against Microsoft\\
(+) Limiting sunk costs\\
(+) Coopetition};

\node [comment, below=0.25cm of suppliers] {(+) Efficiency\\
(+) Attracting other developers\\
(+) Creating a Chrome community};

\node [comment, right=0.25 of substitutes] {(+) Portability};

\node [comment, below=0.25 of users] {(+) Increasing the user information\\
(+) Reducing the switching costs};

\node [comment, right=0.25 of entrants] {(+) EC vs. Microsoft};

\node [comment, text width=3cm, below=0.25 of state] {(+) Positively framed\\
(+) Transparency\\
(--) A new monopoly?};


(substitutes) edge (rivalry)
%(suppliers) edge (rivalry)
(rivalry) edge  (suppliers)
%(users) edge (rivalry)
(rivalry) edge (users)
(entrants) edge (comment-rivalry);

\caption{FOSS in Chrome influences industry structure by increasing competition}


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