huffman-py/huffman_py/gui/generate_node.py

#
#     Sam Hadow - Huffman-py
#     Copyright (C) 2023
#
#     This program is free software: you can redistribute it and/or modify
#     it under the terms of the GNU General Public License as published by
#     the Free Software Foundation, either version 3 of the License, or
#     (at your option) any later version.
#
#     This program is distributed in the hope that it will be useful,
#     but WITHOUT ANY WARRANTY; without even the implied warranty of
#     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#     GNU General Public License for more details.
#
#     You should have received a copy of the GNU General Public License
#     along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
import graphviz

def generate_node(graph, node, father = None):
    if node.left and node.right:
        # not a leaf
        graph.node(str(node.identifier), label = str(node.occurrence) , style = "filled", fillcolor = "red", shape="circle")
    else:
        # a leaf
        graph.node(str(node.identifier), label = graphviz.escape(str(node.occurrence)+'\n'+str(node.char)), style = "filled", fillcolor = "green")
        # https://graphviz.readthedocs.io/en/stable/api.html#graphviz.escape

    if father != None:
        graph.edge(str(father), str(node.identifier), label=str(node.code))

    if node.left:
        generate_node(graph, node.left, node.identifier)
    if node.right:
        generate_node(graph, node.right, node.identifier)