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IO Tools for REMB Agent
Tools for reading/writing CAD files and rendering images
"""
from langchain_core.tools import tool
from typing import Dict, Any, Optional, List
import tempfile
import os
import ezdxf
from shapely.geometry import Polygon
@tool
def read_dxf(file_path: str) -> Dict[str, Any]:
"""
Read and parse a DXF or DWG CAD file to extract site boundary geometry.
Args:
file_path: Path to DXF or DWG file
Returns:
Dictionary containing:
- boundary: GeoJSON Feature with polygon geometry
- metadata: Area, perimeter, bounds, centroid
- status: Success or error info
"""
if not os.path.exists(file_path):
return {
"status": "error",
"message": f"File not found: {file_path}"
}
filename_lower = file_path.lower()
if not (filename_lower.endswith('.dxf') or filename_lower.endswith('.dwg')):
return {
"status": "error",
"message": "File must be .dxf or .dwg format"
}
try:
# Parse the file
doc = ezdxf.readfile(file_path)
msp = doc.modelspace()
# Find closed polylines (potential boundaries)
polygons = []
for entity in msp:
if entity.dxftype() == 'LWPOLYLINE':
if entity.closed:
points = list(entity.get_points())
if len(points) >= 3:
coords = [(p[0], p[1]) for p in points]
coords.append(coords[0]) # Close polygon
poly = Polygon(coords)
if poly.is_valid:
polygons.append((poly, coords))
elif entity.dxftype() == 'POLYLINE':
if entity.is_closed:
points = list(entity.points())
if len(points) >= 3:
coords = [(p[0], p[1]) for p in points]
coords.append(coords[0])
poly = Polygon(coords)
if poly.is_valid:
polygons.append((poly, coords))
if not polygons:
return {
"status": "error",
"message": "No closed polygons found in file"
}
# Get largest polygon as site boundary
polygon, coords = max(polygons, key=lambda x: x[0].area)
# Create GeoJSON
geojson_data = {
"type": "Feature",
"geometry": {
"type": "Polygon",
"coordinates": [coords]
},
"properties": {"source": os.path.basename(file_path)}
}
# Calculate metadata
metadata = {
"area": polygon.area,
"perimeter": polygon.length,
"bounds": list(polygon.bounds),
"centroid": [polygon.centroid.x, polygon.centroid.y],
"vertex_count": len(coords) - 1
}
return {
"status": "success",
"boundary": geojson_data,
"metadata": metadata,
"coords": coords
}
except IOError as e:
if filename_lower.endswith('.dwg'):
return {
"status": "error",
"message": "DWG files require conversion to DXF first. Please convert using AutoCAD or online converter."
}
return {
"status": "error",
"message": f"Failed to read file: {str(e)}"
}
except Exception as e:
return {
"status": "error",
"message": f"Error processing file: {str(e)}"
}
@tool
def write_dxf(layout: Dict[str, Any], output_path: str) -> Dict[str, Any]:
"""
Export a layout with plots to a DXF file for CAD software.
Args:
layout: Dictionary containing boundary coords and plots list
output_path: Path for output DXF file
Returns:
Dictionary with status and file path
"""
from datetime import datetime
from ezdxf.enums import TextEntityAlignment
try:
# Create new DXF document
doc = ezdxf.new(dxfversion="R2010")
msp = doc.modelspace()
# Setup layers
layers = {
'BOUNDARY': {'color': 7}, # White
'SETBACK': {'color': 1}, # Red
'PLOTS': {'color': 5}, # Blue
'LABELS': {'color': 7}, # White
'ANNOTATIONS': {'color': 2}, # Yellow
}
for name, props in layers.items():
doc.layers.add(name, color=props['color'])
# Draw boundary
boundary_coords = layout.get("boundary_coords", [])
if boundary_coords:
msp.add_lwpolyline(boundary_coords, dxfattribs={'layer': 'BOUNDARY', 'closed': True})
# Draw setback zone (50m buffer)
boundary_poly = Polygon(boundary_coords)
setback = boundary_poly.buffer(-50)
if not setback.is_empty:
setback_coords = list(setback.exterior.coords)
msp.add_lwpolyline(setback_coords, dxfattribs={'layer': 'SETBACK', 'closed': True})
# Draw plots
plots = layout.get("plots", [])
for i, plot in enumerate(plots):
coords = plot.get("coords", [])
if coords:
msp.add_lwpolyline(coords, dxfattribs={'layer': 'PLOTS', 'closed': True})
# Add label
plot_poly = Polygon(coords)
centroid = plot_poly.centroid
msp.add_text(
f"P{i+1}",
dxfattribs={
'layer': 'LABELS',
'height': 5,
'insert': (centroid.x, centroid.y)
}
)
# Add area annotation
area = plot.get("area", plot_poly.area)
msp.add_text(
f"{area:.0f}m²",
dxfattribs={
'layer': 'ANNOTATIONS',
'height': 3,
'insert': (centroid.x, centroid.y - 8)
}
)
# Save file
doc.saveas(output_path)
return {
"status": "success",
"file_path": output_path,
"plots_exported": len(plots)
}
except Exception as e:
return {
"status": "error",
"message": f"Failed to write DXF: {str(e)}"
}
@tool
def validate_geometry(coords: List[List[float]]) -> Dict[str, Any]:
"""
Validate geometry coordinates for correctness and fix if possible.
Args:
coords: List of [x, y] coordinate pairs forming a polygon
Returns:
Dictionary with validation status and fixed geometry if needed
"""
try:
# Create polygon
polygon = Polygon(coords)
# Check validity
is_valid = polygon.is_valid
if not is_valid:
# Try to fix with buffer(0)
fixed = polygon.buffer(0)
if fixed.is_valid:
fixed_coords = list(fixed.exterior.coords)
return {
"status": "fixed",
"original_valid": False,
"fixed_coords": fixed_coords,
"area": fixed.area,
"message": "Geometry was invalid but has been fixed"
}
else:
return {
"status": "invalid",
"original_valid": False,
"message": "Geometry is invalid and could not be fixed"
}
return {
"status": "valid",
"original_valid": True,
"area": polygon.area,
"perimeter": polygon.length,
"is_convex": polygon.convex_hull.area == polygon.area
}
except Exception as e:
return {
"status": "error",
"message": f"Validation error: {str(e)}"
}
@tool
def render_layout_preview(
boundary_coords: List[List[float]],
plots: List[Dict[str, Any]],
width: int = 800,
height: int = 600
) -> Dict[str, Any]:
"""
Generate a preview image of the layout for visualization.
Args:
boundary_coords: Site boundary coordinates
plots: List of plot dictionaries with coords
width: Image width in pixels
height: Image height in pixels
Returns:
Dictionary with base64 encoded image or error
"""
try:
import matplotlib
matplotlib.use('Agg') # Non-interactive backend
import matplotlib.pyplot as plt
from matplotlib.patches import Polygon as MplPolygon
from matplotlib.collections import PatchCollection
import io
import base64
fig, ax = plt.subplots(figsize=(width/100, height/100), dpi=100)
# Draw boundary
if boundary_coords:
boundary_patch = MplPolygon(boundary_coords, fill=False, edgecolor='black', linewidth=2)
ax.add_patch(boundary_patch)
# Draw setback
boundary_poly = Polygon(boundary_coords)
setback = boundary_poly.buffer(-50)
if not setback.is_empty:
setback_coords = list(setback.exterior.coords)
setback_patch = MplPolygon(setback_coords, fill=False, edgecolor='red', linestyle='--', linewidth=1)
ax.add_patch(setback_patch)
# Draw plots with colors
colors = plt.cm.Set3.colors
for i, plot in enumerate(plots):
coords = plot.get("coords", [])
if coords:
color = colors[i % len(colors)]
plot_patch = MplPolygon(coords, alpha=0.6, facecolor=color, edgecolor='blue', linewidth=1)
ax.add_patch(plot_patch)
# Add label
plot_poly = Polygon(coords)
centroid = plot_poly.centroid
ax.text(centroid.x, centroid.y, f"P{i+1}", ha='center', va='center', fontsize=8)
# Set axis limits
if boundary_coords:
xs = [c[0] for c in boundary_coords]
ys = [c[1] for c in boundary_coords]
margin = 50
ax.set_xlim(min(xs) - margin, max(xs) + margin)
ax.set_ylim(min(ys) - margin, max(ys) + margin)
ax.set_aspect('equal')
ax.set_xlabel('X (m)')
ax.set_ylabel('Y (m)')
ax.set_title('Layout Preview')
ax.grid(True, alpha=0.3)
# Save to base64
buffer = io.BytesIO()
plt.savefig(buffer, format='png', bbox_inches='tight')
buffer.seek(0)
image_base64 = base64.b64encode(buffer.getvalue()).decode('utf-8')
plt.close(fig)
return {
"status": "success",
"image_base64": image_base64,
"format": "png"
}
except ImportError:
return {
"status": "error",
"message": "matplotlib not installed for rendering"
}
except Exception as e:
return {
"status": "error",
"message": f"Render error: {str(e)}"
}
# Export all tools
io_tools = [read_dxf, write_dxf, validate_geometry, render_layout_preview]
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