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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 for current depth using same logic as graph_generator_utils
lightening_factor = 0.12
# Convert base_color hex to RGB for interpolation
if not isinstance(base_color, str) or not base_color.startswith('#') or len(base_color) != 7:
base_color_safe = '#19191a' # Fallback to default dark if invalid
else:
base_color_safe = base_color
base_r = int(base_color_safe[1:3], 16)
base_g = int(base_color_safe[3:5], 16)
base_b = int(base_color_safe[5:7], 16)
# Calculate current node color by blending towards white
current_r = base_r + int((255 - base_r) * current_depth * lightening_factor)
current_g = base_g + int((255 - base_g) * current_depth * lightening_factor)
current_b = base_b + int((255 - base_b) * current_depth * lightening_factor)
# Clamp values to 255 to stay within valid RGB range
current_r = min(255, current_r)
current_g = min(255, current_g)
current_b = min(255, current_b)
node_color = f'#{current_r:02x}{current_g:02x}{current_b:02x}'
# Font color: white for dark nodes, black for very light nodes for readability
font_color = 'white' if current_depth * lightening_factor < 0.6 else 'black'
# Font size adjusts based on depth, ensuring a minimum size
font_size = max(9, 14 - (current_depth * 2))
# Add the current node
dot.node(
node_id,
node_label,
shape='circle',
style='filled',
fillcolor=node_color,
fontcolor=font_color,
fontsize=str(font_size),
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='#4a4a4a', # Dark gray for lines
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='#4a4a4a', # Dark gray for lines
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)}" |