import json
import matplotlib.pyplot as plt

# 读取 json 文件
with open('real.json', 'r') as f:
    data = json.load(f)

intervals = data['intervals']
times = [i['sum']['start'] for i in intervals]
bandwidth = [i['sum']['bits_per_second'] / 1e6 for i in intervals] # 转为 Mbps
loss = [i['sum']['lost_percent'] for i in intervals]

# 绘图
fig, ax1 = plt.subplots()

ax1.set_xlabel('Time (s)')
ax1.set_ylabel('Bandwidth (Mbps)', color='tab:blue')
ax1.plot(times, bandwidth, color='tab:blue', label='Bandwidth')
ax1.set_ylim(0, 25) # 20M带宽建议坐标上限设为25

ax2 = ax1.twinx()
ax2.set_ylabel('Loss (%)', color='tab:red')
ax2.plot(times, loss, color='tab:red', linestyle='--', label='Loss %')

plt.title('iperf3 UDP 20M Pull Test')
plt.show()