feat(pygal): implement radar-basic

plots/radar-basic/implementations/python/pygal.py

@@ -1,7 +1,7 @@
 """ anyplot.ai
 radar-basic: Basic Radar Chart
-Library: pygal 3.1.0 | Python 3.13.13
-Quality: 90/100 | Updated: 2026-04-29
+Library: pygal 3.1.3 | Python 3.13.14
+Quality: 93/100 | Updated: 2026-07-24
 """
 
 import importlib
@@ -20,6 +20,7 @@
 PAGE_BG = "#FAF8F1" if THEME == "light" else "#1A1A17"
 INK = "#1A1A17" if THEME == "light" else "#F0EFE8"
 INK_MUTED = "#6B6A63" if THEME == "light" else "#A8A79F"
+INK_FAINT = "rgba(107, 106, 99, 0.35)" if THEME == "light" else "rgba(168, 167, 159, 0.35)"
 
 IMPRINT = ("#009E73", "#C475FD", "#4467A3", "#BD8233", "#AE3030", "#2ABCCD", "#954477")
 
@@ -31,44 +32,79 @@
 employee_b = [80, 68, 92, 82, 88, 74]  # Team Leader: peaks at Teamwork & Leadership
 employee_c = [72, 76, 70, 74, 85, 95]  # Creative Visionary: peaks at Creativity & Leadership
 
-# Style — font sizes corrected to pixel-based minimums for 3600px canvas
+# Highest overall average becomes the visual "hero" series — bolder stroke and
+# larger dots build a focal point so the viewer immediately spots the top
+# all-round performer, while the other two stay legible but recede slightly.
+series = [
+    ("Employee A — Technical Expert", employee_a),
+    ("Employee B — Team Leader", employee_b),
+    ("Employee C — Creative Visionary", employee_c),
+]
+hero_label, _ = max(series, key=lambda s: sum(s[1]) / len(s[1]))
+
+title = "radar-basic · python · pygal · anyplot.ai"
+
+# Style — native-pixel font sizes targeting ~67 source-px title height at the
+# canonical 2400x2400 square canvas (see default-style-guide.md "Proportional
+# Sizing"); title is well under the 67-char baseline so no length scaling needed.
+# Radial gridlines get a two-tier treatment (faint dotted minor rings, slightly
+# firmer dashed major rings every 2nd label) instead of pygal's flat default —
+# a subtler ring rhythm beyond the mandated style-guide baseline.
 custom_style = Style(
+    font_family='"Liberation Sans", "DejaVu Sans", Arial, sans-serif',
     background=PAGE_BG,
     plot_background=PAGE_BG,
     foreground=INK,
     foreground_strong=INK,
     foreground_subtle=INK_MUTED,
     colors=IMPRINT,
-    title_font_size=28,
-    label_font_size=22,  # axis category labels: minimum 22px
-    major_label_font_size=18,  # major labels: minimum 18px
-    legend_font_size=18,
-    value_font_size=16,  # spoke value labels: minimum 16px
-    opacity=0.25,
-    opacity_hover=0.6,
+    title_font_size=66,
+    label_font_size=56,
+    major_label_font_size=44,
+    legend_font_size=44,
+    value_font_size=36,
+    opacity=0.22,
+    opacity_hover=0.55,
+    stroke_opacity=0.9,
+    guide_stroke_color=INK_FAINT,
+    guide_stroke_dasharray="2,6",
+    major_guide_stroke_color=INK_MUTED,
+    major_guide_stroke_dasharray="9,4",
 )
 
 # Plot
 chart = pygal.Radar(
-    width=3600,
-    height=3600,
+    width=2400,
+    height=2400,
     style=custom_style,
-    title="radar-basic · pygal · anyplot.ai",
+    title=title,
     show_legend=True,
     legend_at_bottom=True,
-    legend_at_bottom_columns=3,
+    legend_at_bottom_columns=1,
     fill=True,
-    dots_size=8,
-    stroke_style={"width": 5, "linecap": "round", "linejoin": "round"},
+    dots_size=5,
+    stroke_style={"width": 3, "linecap": "round", "linejoin": "round", "dasharray": "14,6"},
     show_y_guides=True,
     y_labels_major_every=2,
     range=(0, 100),
+    margin=30,
+    spacing=16,
 )
 
 chart.x_labels = categories
-chart.add("Employee A — Technical Expert", employee_a)
-chart.add("Employee B — Team Leader", employee_b)
-chart.add("Employee C — Creative Visionary", employee_c)
+for label, values in series:
+    is_hero = label == hero_label
+    # Hero series reads as a bold, solid focal line; supporting series recede
+    # behind a thinner dashed stroke and smaller dots — a wider gap than a flat
+    # stroke-width bump alone so the top performer reads at a glance.
+    chart.add(
+        label,
+        values,
+        dots_size=11 if is_hero else 5,
+        stroke_style={"width": 7.5, "linecap": "round", "linejoin": "round"}
+        if is_hero
+        else {"width": 3, "linecap": "round", "linejoin": "round", "dasharray": "14,6"},
+    )
 
 # Save
 chart.render_to_png(f"plot-{THEME}.png")