feat(matplotlib): implement bar-basic

plots/bar-basic/implementations/matplotlib.py

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+"""
+bar-basic: Basic Bar Chart
+Library: matplotlib
+"""
+
+import matplotlib.pyplot as plt
+
+
+# Data - Product sales by category
+categories = ["Electronics", "Clothing", "Home & Garden", "Sports", "Books", "Toys"]
+values = [45200, 32800, 28500, 21300, 18900, 15600]
+
+# Create plot
+fig, ax = plt.subplots(figsize=(16, 9))
+
+# Bar chart with Python Blue color
+bars = ax.bar(categories, values, color="#306998", width=0.6, edgecolor="white", linewidth=1)
+
+# Add value labels on top of bars
+for bar, value in zip(bars, values, strict=True):
+    height = bar.get_height()
+    ax.annotate(
+        f"${value:,}",
+        xy=(bar.get_x() + bar.get_width() / 2, height),
+        xytext=(0, 8),
+        textcoords="offset points",
+        ha="center",
+        va="bottom",
+        fontsize=14,
+    )
+
+# Labels and styling
+ax.set_xlabel("Product Category", fontsize=20)
+ax.set_ylabel("Sales ($)", fontsize=20)
+ax.set_title("Product Sales by Category", fontsize=20)
+
+# Style tick labels
+ax.tick_params(axis="both", labelsize=16)
+
+# Subtle grid on y-axis only
+ax.yaxis.grid(True, alpha=0.3, linestyle="-")
+ax.set_axisbelow(True)
+
+# Remove top and right spines for cleaner look
+ax.spines["top"].set_visible(False)
+ax.spines["right"].set_visible(False)
+
+# Set y-axis to start at 0
+ax.set_ylim(bottom=0)
+
+plt.tight_layout()
+plt.savefig("plot.png", dpi=300, bbox_inches="tight")

plots/bar-basic/metadata/matplotlib.yaml

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+# Per-library metadata for matplotlib implementation of bar-basic
+# Auto-generated by impl-generate.yml
+
+library: matplotlib
+specification_id: bar-basic
+
+preview_url: https://storage.googleapis.com/pyplots-images/plots/bar-basic/matplotlib/plot.png
+preview_html: null
+
+current:
+  version: 0
+  generated_at: 2025-12-11T22:56:21Z
+  generated_by: claude-opus-4-5-20251101
+  workflow_run: 20150015715
+  issue: 612
+  quality_score: 92
+
+history: []