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import graphviz
import json
from tempfile import NamedTemporaryFile
import os
def generate_binary_tree_diagram(json_input: str, output_format: str) -> str:
"""
Generates a binary tree diagram from JSON input.
Args:
json_input (str): A JSON string describing the binary tree structure.
It must follow the Expected JSON Format Example below.
Expected JSON Format Example:
{
"root": {
"id": "root",
"label": "50",
"left": {
"id": "left_1",
"label": "30",
"left": {
"id": "left_2",
"label": "20"
},
"right": {
"id": "right_2",
"label": "40"
}
},
"right": {
"id": "right_1",
"label": "70",
"left": {
"id": "left_3",
"label": "60"
},
"right": {
"id": "right_3",
"label": "80"
}
}
}
}
Returns:
str: The filepath to the generated PNG image file.
"""
try:
if not json_input.strip():
return "Error: Empty input"
data = json.loads(json_input)
if 'root' not in data:
raise ValueError("Missing required field: root")
dot = graphviz.Digraph(
name='BinaryTree',
format='png',
graph_attr={
'rankdir': 'TB', # Top-to-Bottom layout (vertical hierarchy)
'splines': 'line', # Straight lines
'bgcolor': 'white', # White background
'pad': '0.5', # Padding around the graph
'nodesep': '0.8', # Spacing between nodes
'ranksep': '1.0' # Spacing between levels
}
)
base_color = '#19191a' # Hardcoded base color
def add_binary_tree_nodes(node, current_depth=0):
"""
Add binary tree nodes recursively with proper styling.
"""
if not node:
return
node_id = node.get('id', f'node_{current_depth}')
node_label = node.get('label', 'Node')
# Calculate color opacity based on depth
max_depth = 5 # Assume maximum depth for color calculation
if current_depth >= max_depth:
opacity = '80' # Minimum opacity
else:
opacity_value = int(255 * (1.0 - (current_depth * 0.6 / max_depth)))
opacity = format(opacity_value, '02x')
node_color = f"{base_color}{opacity}"
font_color = 'white' if current_depth < 3 else 'black'
# Add the current node
dot.node(
node_id,
node_label,
shape='circle',
style='filled',
fillcolor=node_color,
fontcolor=font_color,
fontsize='14',
width='0.8',
height='0.8'
)
# Process left child
left_child = node.get('left')
if left_child:
add_binary_tree_nodes(left_child, current_depth + 1)
left_id = left_child.get('id', f'node_{current_depth + 1}_left')
dot.edge(
node_id,
left_id,
color='#666666',
arrowsize='0.8'
)
# Process right child
right_child = node.get('right')
if right_child:
add_binary_tree_nodes(right_child, current_depth + 1)
right_id = right_child.get('id', f'node_{current_depth + 1}_right')
dot.edge(
node_id,
right_id,
color='#666666',
arrowsize='0.8'
)
# Add binary tree nodes and edges recursively
add_binary_tree_nodes(data['root'], current_depth=0)
with NamedTemporaryFile(delete=False, suffix=f'.{output_format}') as tmp:
dot.render(tmp.name, format=output_format, cleanup=True)
return f"{tmp.name}.{output_format}"
except json.JSONDecodeError:
return "Error: Invalid JSON format"
except Exception as e:
return f"Error: {str(e)}" |