gantt-chart

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---
name: "gantt-chart"
description: "Generate Gantt charts for construction scheduling. Create visual project timelines with dependencies and progress tracking."
homepage: "https://datadrivenconstruction.io"
metadata: {"openclaw": {"emoji": "🎬", "os": ["darwin", "linux", "win32"], "homepage": "https://datadrivenconstruction.io", "requires": {"bins": ["python3"]}}}
---
# Gantt Chart Generator

## Business Case

### Problem Statement
Schedule visualization challenges:
- Complex task dependencies
- Progress tracking
- Critical path visibility
- Multi-level WBS display

### Solution
Generate interactive Gantt charts from schedule data with dependency visualization, progress tracking, and export capabilities.

## Technical Implementation

```python
import pandas as pd
from typing import Dict, Any, List, Optional
from dataclasses import dataclass, field
from datetime import date, timedelta
from enum import Enum


class TaskStatus(Enum):
    NOT_STARTED = "not_started"
    IN_PROGRESS = "in_progress"
    COMPLETED = "completed"
    DELAYED = "delayed"
    ON_HOLD = "on_hold"


class DependencyType(Enum):
    FS = "finish_to_start"
    SS = "start_to_start"
    FF = "finish_to_finish"
    SF = "start_to_finish"


@dataclass
class Task:
    task_id: str
    name: str
    start_date: date
    end_date: date
    wbs_code: str = ""
    progress: float = 0  # 0-100
    status: TaskStatus = TaskStatus.NOT_STARTED
    assignee: str = ""
    level: int = 0
    is_milestone: bool = False
    is_summary: bool = False
    parent_id: str = ""


@dataclass
class Dependency:
    predecessor_id: str
    successor_id: str
    dep_type: DependencyType = DependencyType.FS
    lag: int = 0


class GanttChartGenerator:
    """Generate Gantt charts for construction scheduling."""

    def __init__(self, project_name: str):
        self.project_name = project_name
        self.tasks: Dict[str, Task] = {}
        self.dependencies: List[Dependency] = []

    def add_task(self, task: Task):
        """Add task to chart."""
        self.tasks[task.task_id] = task

    def add_dependency(self, predecessor_id: str, successor_id: str,
                       dep_type: DependencyType = DependencyType.FS,
                       lag: int = 0):
        """Add dependency between tasks."""
        self.dependencies.append(Dependency(
            predecessor_id=predecessor_id,
            successor_id=successor_id,
            dep_type=dep_type,
            lag=lag
        ))

    def import_from_df(self, df: pd.DataFrame):
        """Import tasks from DataFrame."""

        for _, row in df.iterrows():
            task = Task(
                task_id=str(row['task_id']),
                name=row['name'],
                start_date=pd.to_datetime(row['start_date']).date(),
                end_date=pd.to_datetime(row['end_date']).date(),
                wbs_code=str(row.get('wbs_code', '')),
                progress=float(row.get('progress', 0)),
                level=int(row.get('level', 0)),
                is_milestone=bool(row.get('is_milestone', False)),
                is_summary=bool(row.get('is_summary', False)),
                parent_id=str(row.get('parent_id', ''))
            )
            self.add_task(task)

    def get_project_range(self) -> tuple:
        """Get project date range."""

        if not self.tasks:
            return (date.today(), date.today())

        min_date = min(t.start_date for t in self.tasks.values())
        max_date = max(t.end_date for t in self.tasks.values())
        return (min_date, max_date)

    def get_duration(self, task_id: str) -> int:
        """Get task duration in days."""

        task = self.tasks.get(task_id)
        if task:
            return (task.end_date - task.start_date).days + 1
        return 0

    def generate_text_gantt(self, width: int = 60) -> str:
        """Generate text-based Gantt chart."""

        if not self.tasks:
            return "No tasks"

        lines = []
        start, end = self.