In this exercise we will draw trees using the Graphviz tool "dot".

To get started do the following

• Download the Graphviz library we discussed in class: Graphviz.hs.
• Go to the Graphviz website and down load the tools.
• Install the tools on your computer. See here.
• Cut and paste the program template below to get started.
• Define your own tree like data type, called Tree, by adding a "data" declaration.
• Add Instance declarations for Tree, LabeledTree, and Functor
• Define several values, tree1, tree2, and tree3, of type Tree.
• Use the function toPng (from the Graphviz module) to draw pictures of your tree.

module UsingDot where

import Graphviz

data Tree a = ...

tree1:: Tree ?
tree1 = ...

tree2:: Tree ?
tree2 = ...

tree3:: Tree ?
tree3 = ...

main = toPng tree1

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