Plot Gantt Chart Using JSON

plot.py

import matplotlib.pyplot as plt
import matplotlib.dates as mdates
from datetime import datetime
import pandas as pd

task_data = {
    "Task Name": [
        "Project Setup and Environment Configuration", "Design UI and Dashboard",
        "Develop Home Screen and Dashboard", "Implement Navigation Logic", 
        "Develop Program Management Module", "Develop Area Management Module", 
        "Develop Employee Management Module", "Integrate Management Modules", 
        "Develop New Bug Entry Form", "Develop Bug Search Functionality", 
        "Develop Bug Results Page", "Develop Update Bug Form", 
        "Integrate Bug Management Features", "Develop Database Maintenance Page", 
        "Testing and Quality Assurance", "Final Deployment and Documentation"
    ],
    "Start Date": [
        "2024-10-30", "2024-10-30", "2024-11-05", "2024-11-08", 
        "2024-11-10", "2024-11-10", "2024-11-10", "2024-11-14", 
        "2024-11-16", "2024-11-16", "2024-11-20", "2024-11-20", 
        "2024-11-23", "2024-11-16", "2024-11-25", "2024-12-01"
    ],
    "End Date": [
        "2024-10-31", "2024-11-04", "2024-11-07", "2024-11-09", 
        "2024-11-12", "2024-11-12", "2024-11-13", "2024-11-15", 
        "2024-11-19", "2024-11-19", "2024-11-22", "2024-11-22", 
        "2024-11-24", "2024-11-18", "2024-11-30", "2024-12-02"
    ]
}

df_tasks = pd.DataFrame(task_data)

df_tasks["Start Date"] = pd.to_datetime(df_tasks["Start Date"])
df_tasks["End Date"] = pd.to_datetime(df_tasks["End Date"])
df_tasks["Duration"] = df_tasks["End Date"] - df_tasks["Start Date"]

colors = ["#FF9999", "#66B2FF", "#99FF99", "#FFCC99", "#FF6666", "#66FFB2", "#FFB266", "#B266FF", 
          "#FF66B2", "#66FF66", "#9999FF", "#FF66FF", "#FF9966", "#B2FF66", "#66B2FF", "#FFB2FF"]

fig, ax = plt.subplots(figsize=(12, 8))
for i, task in df_tasks.iterrows():
    color = colors[i % len(colors)]
    ax.barh(task["Task Name"], task["Duration"].days, left=task["Start Date"], align='center', color=color, edgecolor="black")
    ax.text(task["Start Date"] + task["Duration"] / 2, i, f"{task['Duration'].days}d", va='center', ha='center', color="black")

ax.xaxis.set_major_locator(mdates.WeekdayLocator(interval=1))
ax.xaxis.set_major_formatter(mdates.DateFormatter("%b %d"))

plt.xlabel("Date")
plt.ylabel("Tasks")
plt.title("Project Schedule Gantt Chart with Individual Colors")

plt.xticks(rotation=45)
plt.tight_layout()
plt.show()