#!/usr/bin/env python3
# -*- coding: utf-8 -*-
"""stem: stem plot demo."""
import numpy as np
from figrecipe.styles import load_style
[docs]
def plot_stem(plt, rng, ax=None):
"""Stem plot demo with multiple series and legend.
Demonstrates: ax.stem() with SCITEX color palette and legend
"""
if ax is None:
fig, ax = plt.subplots()
else:
fig = ax.get_figure() if hasattr(ax, "get_figure") else ax.fig
# Get SCITEX color palette
style = load_style()
palette = style.get("colors", {}).get("palette", [])
colors = [tuple(v / 255.0 for v in c) for c in palette[:3]]
x = np.arange(10)
# Multiple stem series with legend
# Use color kwarg (figrecipe extension) for reproducible coloring
series = [("Signal A", 0), ("Signal B", 0.3), ("Signal C", -0.3)]
for (label, offset), color in zip(series, colors):
y = rng.uniform(0, 1, 10) + offset
ax.stem(x, y, label=label, color=color, id=f"stem_{label}")
ax.set_xlabel("X")
ax.set_ylabel("Y")
ax.set_title("stem")
ax.legend()
return fig, ax
# EOF