Network Traffic Heatmap

import matplotlib.pyplot as plt
import numpy as np
from matplotlib.colors import LinearSegmentedColormap
from matplotlib.patches import FancyBboxPatch

fig, ax = plt.subplots(figsize=(14, 7), facecolor='#ffffff')
ax.set_facecolor('#ffffff')

np.random.seed(42)
nodes = ['Gateway', 'Firewall', 'Load Bal.', 'App Srv 1', 'App Srv 2', 'DB Master']
hours = [f'{h:02d}:00' for h in range(0, 24, 2)]
data = np.random.gamma(4, 500, (len(nodes), len(hours)))

colors = ['#1e293b', '#701a75', '#c026d3', '#e879f9', '#fae8ff']
cmap = LinearSegmentedColormap.from_list('modern', colors, N=256)

cell_w, cell_h = 0.88, 0.82
for i in range(len(nodes)):
    for j in range(len(hours)):
        val = data[i, j]
        rect = FancyBboxPatch((j - cell_w/2, i - cell_h/2), cell_w, cell_h,
                               boxstyle="round,pad=0.02,rounding_size=0.12",
                               facecolor=cmap((val - 0) / (data.max() - 0)), edgecolor='#e2e8f0', linewidth=1.5)
        ax.add_patch(rect)
        

ax.set_xlim(-0.5, len(hours)-0.5)
ax.set_ylim(-0.5, len(nodes)-0.5)
ax.set_aspect('equal')
ax.invert_yaxis()
ax.set_xticks(range(len(hours)))
ax.set_yticks(range(len(nodes)))
ax.set_xticklabels(hours, color='#64748b', fontsize=10, fontweight='500')
ax.set_yticklabels(nodes, color='#1e293b', fontsize=11, fontweight='500')

sm = plt.cm.ScalarMappable(cmap=cmap, norm=plt.Normalize(0, data.max()))
cbar = plt.colorbar(sm, ax=ax, shrink=0.8, pad=0.02)
cbar.set_label('Mbps', color='#1e293b', fontsize=11)
cbar.outline.set_edgecolor('#e2e8f0')
plt.setp(plt.getp(cbar.ax.axes, 'yticklabels'), color='#64748b')

for spine in ax.spines.values(): spine.set_visible(False)
ax.tick_params(length=0)
ax.set_title('Network Traffic by Node', fontsize=18, color='#1e293b', fontweight='bold', pad=20)
plt.tight_layout()
plt.show()