feat(highcharts): implement chernoff-basic (#6834)

## Implementation: `chernoff-basic` - python/highcharts

Implements the **python/highcharts** version of `chernoff-basic`.

**File:** `plots/chernoff-basic/implementations/python/highcharts.py`

**Parent Issue:** #3003

---
:robot: *[impl-generate
workflow](https://github.com/MarkusNeusinger/anyplot/actions/runs/25925422377)*

---------

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: Markus Neusinger <2921697+MarkusNeusinger@users.noreply.github.com>

Author: github-actions[bot]

plots/chernoff-basic/implementations/python/highcharts.py

@@ -1,10 +1,11 @@
-""" pyplots.ai
+""" anyplot.ai
 chernoff-basic: Chernoff Faces for Multivariate Data
-Library: highcharts unknown | Python 3.13.11
-Quality: 91/100 | Created: 2025-12-31
+Library: highcharts unknown | Python 3.13.13
+Quality: 80/100 | Updated: 2026-05-15
 """
 
 import base64
+import os
 import tempfile
 import time
 from pathlib import Path
@@ -15,7 +16,16 @@
 from sklearn.datasets import load_iris
 
 
-# Data - Using Iris dataset (4 variables per flower)
+THEME = os.getenv("ANYPLOT_THEME", "light")
+PAGE_BG = "#FAF8F1" if THEME == "light" else "#1A1A17"
+ELEVATED_BG = "#FFFDF6" if THEME == "light" else "#242420"
+INK = "#1A1A17" if THEME == "light" else "#F0EFE8"
+INK_SOFT = "#4A4A44" if THEME == "light" else "#B8B7B0"
+INK_MUTED = "#6B6A63" if THEME == "light" else "#A8A79F"
+
+OKABE_ITO = ["#009E73", "#D55E00", "#0072B2"]
+
+# Data
 np.random.seed(42)
 iris = load_iris()
 X = iris.data
@@ -36,96 +46,80 @@
 X_max = X_sample.max(axis=0)
 X_norm = (X_sample - X_min) / (X_max - X_min + 1e-8)
 
-# Colors for species - colorblind-safe
-species_colors = ["#306998", "#FFD43B", "#9467BD"]
-
 # SVG dimensions
 svg_width = 4800
 svg_height = 2700
 
-# Build custom Chernoff faces HTML/SVG
-# Feature mappings:
-# - Variable 0 (sepal length): face width
-# - Variable 1 (sepal width): eye size
-# - Variable 2 (petal length): mouth curvature
-# - Variable 3 (petal width): eyebrow slant
-
 
 def create_face_svg(values, color, label, x_pos, y_pos, size=450):
     """Create SVG for a single Chernoff face."""
-    # Extract normalized values (0-1)
-    face_width = 0.7 + values[0] * 0.3  # 0.7 to 1.0 multiplier
-    eye_size = 0.7 + values[1] * 0.5  # 0.7 to 1.2 multiplier
-    mouth_curve = values[2] * 2 - 1  # -1 to 1 (sad to happy)
-    eyebrow_slant = (values[3] - 0.5) * 30  # -15 to +15 degrees
+    face_width = 0.7 + values[0] * 0.3
+    eye_size = 0.7 + values[1] * 0.5
+    mouth_curve = values[2] * 2 - 1
+    eyebrow_slant = (values[3] - 0.5) * 30
 
     cx = x_pos + size // 2
     cy = y_pos + size // 2
     face_rx = int(size * 0.4 * face_width)
     face_ry = int(size * 0.45)
 
-    # Eye positions and sizes
     eye_cx_left = cx - int(size * 0.15)
     eye_cx_right = cx + int(size * 0.15)
     eye_cy = cy - int(size * 0.08)
     eye_r = int(18 * eye_size)
     pupil_r = int(9 * eye_size)
 
-    # Mouth (cubic bezier curve)
     mouth_y = cy + int(size * 0.2)
     mouth_width = int(size * 0.25)
     mouth_curve_offset = int(mouth_curve * size * 0.12)
 
-    # Eyebrows
     brow_y = eye_cy - int(size * 0.12)
     brow_len = int(size * 0.12)
 
     svg = f"""
     <!-- Face {label} -->
     <ellipse cx="{cx}" cy="{cy}" rx="{face_rx}" ry="{face_ry}"
-             fill="{color}" stroke="#333333" stroke-width="4"/>
+             fill="{color}" stroke="{INK}" stroke-width="4"/>
 
     <!-- Left eye -->
-    <circle cx="{eye_cx_left}" cy="{eye_cy}" r="{eye_r}" fill="white" stroke="#333333" stroke-width="3"/>
-    <circle cx="{eye_cx_left}" cy="{eye_cy}" r="{pupil_r}" fill="#333333"/>
+    <circle cx="{eye_cx_left}" cy="{eye_cy}" r="{eye_r}" fill="{ELEVATED_BG}" stroke="{INK}" stroke-width="3"/>
+    <circle cx="{eye_cx_left}" cy="{eye_cy}" r="{pupil_r}" fill="{INK}"/>
 
     <!-- Right eye -->
-    <circle cx="{eye_cx_right}" cy="{eye_cy}" r="{eye_r}" fill="white" stroke="#333333" stroke-width="3"/>
-    <circle cx="{eye_cx_right}" cy="{eye_cy}" r="{pupil_r}" fill="#333333"/>
+    <circle cx="{eye_cx_right}" cy="{eye_cy}" r="{eye_r}" fill="{ELEVATED_BG}" stroke="{INK}" stroke-width="3"/>
+    <circle cx="{eye_cx_right}" cy="{eye_cy}" r="{pupil_r}" fill="{INK}"/>
 
     <!-- Left eyebrow -->
     <line x1="{eye_cx_left - brow_len}" y1="{brow_y + int(eyebrow_slant)}"
           x2="{eye_cx_left + brow_len}" y2="{brow_y - int(eyebrow_slant)}"
-          stroke="#333333" stroke-width="5" stroke-linecap="round"/>
+          stroke="{INK}" stroke-width="5" stroke-linecap="round"/>
 
     <!-- Right eyebrow -->
     <line x1="{eye_cx_right - brow_len}" y1="{brow_y - int(eyebrow_slant)}"
           x2="{eye_cx_right + brow_len}" y2="{brow_y + int(eyebrow_slant)}"
-          stroke="#333333" stroke-width="5" stroke-linecap="round"/>
+          stroke="{INK}" stroke-width="5" stroke-linecap="round"/>
 
     <!-- Nose -->
     <line x1="{cx}" y1="{cy - int(size * 0.02)}" x2="{cx}" y2="{cy + int(size * 0.1)}"
-          stroke="#333333" stroke-width="4" stroke-linecap="round"/>
+          stroke="{INK}" stroke-width="4" stroke-linecap="round"/>
 
     <!-- Mouth -->
     <path d="M {cx - mouth_width} {mouth_y} Q {cx} {mouth_y + mouth_curve_offset} {cx + mouth_width} {mouth_y}"
-          fill="none" stroke="#333333" stroke-width="5" stroke-linecap="round"/>
+          fill="none" stroke="{INK}" stroke-width="5" stroke-linecap="round"/>
 
     <!-- Label -->
     <text x="{cx}" y="{y_pos + size + 50}" text-anchor="middle"
-          font-size="36" font-family="Arial, sans-serif" font-weight="bold">{label}</text>
+          font-size="36" font-family="Arial, sans-serif" font-weight="bold" fill="{INK}">{label}</text>
     """
     return svg
 
 
-# Create the complete HTML with embedded SVG
+# Create faces grid
 faces_svg = ""
 face_size = 580
 cols = 3
 rows = 3
 
-# Calculate grid to center faces properly across the canvas
-# Leave space for legends on right (about 600px) and title at top (about 220px)
 grid_left = 100
 grid_right = 3350
 grid_top = 250
@@ -134,52 +128,50 @@ def create_face_svg(values, color, label, x_pos, y_pos, size=450):
 grid_width = grid_right - grid_left
 grid_height = grid_bottom - grid_top
 
-# Calculate cell size for even distribution
 cell_width = grid_width // cols
 cell_height = grid_height // rows
 
 for idx in range(9):
     row = idx // cols
     col = idx % cols
 
-    # Center face within its cell
     cell_x = grid_left + col * cell_width
     cell_y = grid_top + row * cell_height
     x_pos = cell_x + (cell_width - face_size) // 2
-    y_pos = cell_y + (cell_height - face_size - 60) // 2  # -60 for label space
+    y_pos = cell_y + (cell_height - face_size - 60) // 2
 
     species_idx = y_sample[idx]
-    color = species_colors[species_idx]
+    color = OKABE_ITO[species_idx]
     label = f"{species_names[species_idx]} #{(idx % 3) + 1}"
 
     faces_svg += create_face_svg(X_norm[idx], color, label, x_pos, y_pos, face_size)
 
-# Create legend - positioned in right column, vertically centered
+# Species legend
 legend_x = 3550
 legend_y = 450
 legend_svg = f"""
-<rect x="{legend_x}" y="{legend_y}" width="550" height="380" fill="#f8f8f8" stroke="#333333" stroke-width="3" rx="15"/>
-<text x="{legend_x + 35}" y="{legend_y + 60}" font-size="44" font-family="Arial, sans-serif" font-weight="bold">Species Legend</text>
+<rect x="{legend_x}" y="{legend_y}" width="550" height="380" fill="{ELEVATED_BG}" stroke="{INK_SOFT}" stroke-width="3" rx="15"/>
+<text x="{legend_x + 35}" y="{legend_y + 60}" font-size="44" font-family="Arial, sans-serif" font-weight="bold" fill="{INK}">Species</text>
 """
 
-for i, (species, color) in enumerate(zip(species_names, species_colors, strict=True)):
+for i, (species, color) in enumerate(zip(species_names, OKABE_ITO, strict=True)):
     ly_item = legend_y + 130 + i * 80
     legend_svg += f"""
-    <circle cx="{legend_x + 60}" cy="{ly_item}" r="30" fill="{color}" stroke="#333333" stroke-width="3"/>
-    <text x="{legend_x + 110}" y="{ly_item + 14}" font-size="38" font-family="Arial, sans-serif">{species}</text>
+    <circle cx="{legend_x + 60}" cy="{ly_item}" r="30" fill="{color}" stroke="{INK}" stroke-width="3"/>
+    <text x="{legend_x + 110}" y="{ly_item + 14}" font-size="38" font-family="Arial, sans-serif" fill="{INK}">{species}</text>
     """
 
 # Feature mapping legend
 feature_legend_y = legend_y + 450
 feature_legend_svg = f"""
-<rect x="{legend_x}" y="{feature_legend_y}" width="550" height="480" fill="#f8f8f8" stroke="#333333" stroke-width="3" rx="15"/>
-<text x="{legend_x + 35}" y="{feature_legend_y + 60}" font-size="40" font-family="Arial, sans-serif" font-weight="bold">Feature Mapping</text>
-<text x="{legend_x + 35}" y="{feature_legend_y + 130}" font-size="30" font-family="Arial, sans-serif">Face Width → Sepal Length</text>
-<text x="{legend_x + 35}" y="{feature_legend_y + 190}" font-size="30" font-family="Arial, sans-serif">Eye Size → Sepal Width</text>
-<text x="{legend_x + 35}" y="{feature_legend_y + 250}" font-size="30" font-family="Arial, sans-serif">Mouth Curve → Petal Length</text>
-<text x="{legend_x + 35}" y="{feature_legend_y + 310}" font-size="30" font-family="Arial, sans-serif">Eyebrow Slant → Petal Width</text>
-<line x1="{legend_x + 35}" y1="{feature_legend_y + 355}" x2="{legend_x + 515}" y2="{feature_legend_y + 355}" stroke="#cccccc" stroke-width="2"/>
-<text x="{legend_x + 35}" y="{feature_legend_y + 410}" font-size="26" font-family="Arial, sans-serif" fill="#666666">All values normalized to 0-1 range</text>
+<rect x="{legend_x}" y="{feature_legend_y}" width="550" height="480" fill="{ELEVATED_BG}" stroke="{INK_SOFT}" stroke-width="3" rx="15"/>
+<text x="{legend_x + 35}" y="{feature_legend_y + 60}" font-size="40" font-family="Arial, sans-serif" font-weight="bold" fill="{INK}">Mapping</text>
+<text x="{legend_x + 35}" y="{feature_legend_y + 130}" font-size="30" font-family="Arial, sans-serif" fill="{INK_SOFT}">Face W → Sepal L</text>
+<text x="{legend_x + 35}" y="{feature_legend_y + 190}" font-size="30" font-family="Arial, sans-serif" fill="{INK_SOFT}">Eye Size → Sepal W</text>
+<text x="{legend_x + 35}" y="{feature_legend_y + 250}" font-size="30" font-family="Arial, sans-serif" fill="{INK_SOFT}">Mouth → Petal L</text>
+<text x="{legend_x + 35}" y="{feature_legend_y + 310}" font-size="30" font-family="Arial, sans-serif" fill="{INK_SOFT}">Brow → Petal W</text>
+<line x1="{legend_x + 35}" y1="{feature_legend_y + 355}" x2="{legend_x + 515}" y2="{feature_legend_y + 355}" stroke="{INK_MUTED}" stroke-width="2"/>
+<text x="{legend_x + 35}" y="{feature_legend_y + 410}" font-size="26" font-family="Arial, sans-serif" fill="{INK_MUTED}">Normalized 0–1</text>
 """
 
 # Complete HTML
@@ -188,24 +180,24 @@ def create_face_svg(values, color, label, x_pos, y_pos, size=450):
 <head>
     <meta charset="utf-8">
     <style>
-        body {{ margin: 0; padding: 0; background: #ffffff; }}
+        body {{ margin: 0; padding: 0; background: {PAGE_BG}; }}
     </style>
 </head>
 <body>
     <svg width="{svg_width}" height="{svg_height}" xmlns="http://www.w3.org/2000/svg">
         <!-- Background -->
-        <rect width="100%" height="100%" fill="#ffffff"/>
+        <rect width="100%" height="100%" fill="{PAGE_BG}"/>
 
         <!-- Title -->
         <text x="{svg_width // 2}" y="100" text-anchor="middle"
-              font-size="64" font-family="Arial, sans-serif" font-weight="bold">
-            chernoff-basic · highcharts · pyplots.ai
+              font-size="64" font-family="Arial, sans-serif" font-weight="bold" fill="{INK}">
+            chernoff-basic · highcharts · anyplot.ai
         </text>
 
         <!-- Subtitle -->
         <text x="{svg_width // 2}" y="175" text-anchor="middle"
-              font-size="40" font-family="Arial, sans-serif" fill="#666666">
-            Iris Dataset: 4 Variables Mapped to Facial Features (9 Samples, 3 Per Species)
+              font-size="40" font-family="Arial, sans-serif" fill="{INK_SOFT}">
+            Iris Dataset: 4 Variables Mapped to Facial Features
         </text>
 
         <!-- Faces Grid -->
@@ -221,7 +213,7 @@ def create_face_svg(values, color, label, x_pos, y_pos, size=450):
 </html>"""
 
 # Save HTML version
-with open("plot.html", "w", encoding="utf-8") as f:
+with open(f"plot-{THEME}.html", "w", encoding="utf-8") as f:
     f.write(html_content)
 
 # Export to PNG via Selenium
@@ -241,13 +233,11 @@ def create_face_svg(values, color, label, x_pos, y_pos, size=450):
 driver.get(f"file://{temp_path}")
 time.sleep(3)
 
-# Use CDP to capture full page at exact dimensions
 driver.execute_cdp_cmd(
     "Emulation.setDeviceMetricsOverride", {"width": 4800, "height": 2700, "deviceScaleFactor": 1, "mobile": False}
 )
 time.sleep(1)
 
-# Take screenshot with clip to exact dimensions
 result = driver.execute_cdp_cmd(
     "Page.captureScreenshot",
     {
@@ -257,7 +247,7 @@ def create_face_svg(values, color, label, x_pos, y_pos, size=450):
     },
 )
 
-with open("plot.png", "wb") as f:
+with open(f"plot-{THEME}.png", "wb") as f:
     f.write(base64.b64decode(result["data"]))
 
 driver.quit()