app.py

import streamlit as st
import numpy as np
import matplotlib.pyplot as plt
from matplotlib.patches import Polygon, Circle

# Function to calculate the distance between two points
def calculate_distance(x1, y1, x2, y2):
    return np.sqrt((x2 - x1) ** 2 + (y2 - y1) ** 2)

# Function to calculate angles using the Law of Cosines
def calculate_angle(a, b, c):
    try:
        angle = np.degrees(np.arccos((b ** 2 + c ** 2 - a ** 2) / (2 * b * c)))
    except ValueError:
        angle = 0  # Handle possible domain error in acos
    return angle

# Function to calculate the area of a triangle using Heron's formula
def calculate_area(a, b, c):
    s = (a + b + c) / 2
    return np.sqrt(s * (s - a) * (s - b) * (s - c))

# Function to calculate the perimeter of the triangle
def calculate_perimeter(a, b, c):
    return a + b + c

# Main function to run the app
def main():
    st.set_page_config(
        page_title="Advanced Triangle Solver",
        layout="wide",
        initial_sidebar_state="expanded",
    )

    st.markdown(
        """
        <style>
        body {
            background-color: #f7f9fc;
            color: #333333;
            font-family: 'Open Sans', sans-serif;
        }
        .stTitle, .stHeader, .stSubheader {
            color: #1a73e8;
            font-weight: bold;
        }
        .stSidebar {
            background-color: #f0f4f8;
            color: #333333;
        }
        .stMarkdown {
            font-size: 16px;
        }
        .stButton > button {
            background-color: #1a73e8;
            color: white;
            border: none;
            border-radius: 5px;
            padding: 10px 20px;
            font-size: 16px;
            cursor: pointer;
        }
        .stButton > button:hover {
            background-color: #155ab3;
        }
        </style>
        """,
        unsafe_allow_html=True,
    )

    st.title("🔺 Advanced Triangle Solver")
    st.sidebar.header("📌 Input Coordinates")

    # Collect user input
    x1 = st.sidebar.number_input("X1", min_value=-100.0, max_value=100.0, step=0.1, format="%.2f")
    y1 = st.sidebar.number_input("Y1", min_value=-100.0, max_value=100.0, step=0.1, format="%.2f")
    x2 = st.sidebar.number_input("X2", min_value=-100.0, max_value=100.0, step=0.1, format="%.2f")
    y2 = st.sidebar.number_input("Y2", min_value=-100.0, max_value=100.0, step=0.1, format="%.2f")
    x3 = st.sidebar.number_input("X3", min_value=-100.0, max_value=100.0, step=0.1, format="%.2f")
    y3 = st.sidebar.number_input("Y3", min_value=-100.0, max_value=100.0, step=0.1, format="%.2f")

    if st.sidebar.button("Calculate 🔍"):
        # Calculate distances
        a = calculate_distance(x2, y2, x3, y3)
        b = calculate_distance(x1, y1, x3, y3)
        c = calculate_distance(x1, y1, x2, y2)

        # Calculate angles
        angle_A = calculate_angle(b, a, c)
        angle_B = calculate_angle(c, a, b)
        angle_C = calculate_angle(a, b, c)

        # Calculate area and perimeter
        area = calculate_area(a, b, c)
        perimeter = calculate_perimeter(a, b, c)

        # Display results
        st.subheader("📐 Triangle Properties")
        st.write(f"**Side a (between points (x2, y2) and (x3, y3)): {a:.2f} units**")
        st.write(f"**Side b (between points (x1, y1) and (x3, y3)): {b:.2f} units**")
        st.write(f"**Side c (between points (x1, y1) and (x2, y2)): {c:.2f} units**")
        st.write(f"**Angle A (at point (x1, y1)): {angle_A:.2f}°**")
        st.write(f"**Angle B (at point (x2, y2)): {angle_B:.2f}°**")
        st.write(f"**Angle C (at point (x3, y3)): {angle_C:.2f}°**")
        st.write(f"**Area of the Triangle: {area:.2f} square units**")
        st.write(f"**Perimeter of the Triangle: {perimeter:.2f} units**")

        # Plot the triangle
        fig, ax = plt.subplots()
        triangle = Polygon([(x1, y1), (x2, y2), (x3, y3)], closed=True, fill=None, edgecolor='r')
        ax.add_patch(triangle)
        ax.text(x1, y1, f'({x1}, {y1})', fontsize=12, ha='right')
        ax.text(x2, y2, f'({x2}, {y2})', fontsize=12, ha='right')
        ax.text(x3, y3, f'({x3}, {y3})', fontsize=12, ha='right')

        ax.set_xlim(min(x1, x2, x3) - 5, max(x1, x2, x3) + 5)
        ax.set_ylim(min(y1, y2, y3) - 5, max(y1, y2, y3) + 5)
        ax.set_aspect('equal', adjustable='box')
        ax.set_title("Triangle Visualization")
        st.pyplot(fig)

if __name__ == "__main__":
    main()