import matplotlib.pyplot as plt
import networkx as nx
 
# สร้างกราฟแทนวงจร
G = nx.Graph()
 
# ตำแหน่งของจุดต่าง ๆ
positions = {
    'A': (0, 0),
    'M': (1, 1.5),
    'C': (2, 3),
    'D': (2, 0),
    'E': (3, 1.5),
    'B': (4, 0)
}
 
# เพิ่มตัวต้านทาน (หน่วย: โอห์ม)
edges = [
    ('A', 'M', 1.905),
    ('M', 'C', 1.905),
    ('M', 'D', 3.048),
    ('C', 'E', 8),
    ('D', 'E', 6),
    ('E', 'B', 8),
    ('A', 'B', 7)
]
 
# เพิ่มเส้นเชื่อมและค่าความต้านทานลงในกราฟ
for u, v, r in edges:
    G.add_edge(u, v, resistance=r)
 
# วาดวงจร
plt.figure(figsize=(10, 6))
nx.draw(G, pos=positions, with_labels=True, node_color='lightblue', node_size=1200, font_size=14, font_weight='bold')
edge_labels = {(u, v): f"{d['resistance']}Ω" for u, v, d in G.edges(data=True)}
nx.draw_networkx_edge_labels(G, pos=positions, edge_labels=edge_labels, font_size=12)
 
plt.title("วงจรที่แปลงรูปสามเหลี่ยม A-C-D เป็นรูปดาว (Delta to Star)", fontsize=14)
plt.axis('off')
plt.tight_layout()
plt.show()
 

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