From 5e3d799096c432c54643ecbf96943796286ae8ef Mon Sep 17 00:00:00 2001
From: Thomas Hallock <thomas@evolutioniq.com>
Date: Wed, 10 Sep 2025 09:12:43 -0500
Subject: [PATCH] feat: implement physical abacus logic and fix numeral
 coloring regression
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

This commit includes two major improvements:

1. Physical Abacus Logic for Bead Positioning:
   - Rewrote bead positioning to accurately model physical soroban behavior
   - Active beads positioned close to reckoning bar in sequence
   - Inactive beads positioned after active beads + gap, or after bar + gap if no active beads
   - Consistent 5pt gaps maintain proper visual separation
   - Fixes PDF/SVG positioning inconsistencies

2. Individual Digit Coloring for Place-Value Scheme:
   - Fixed regression where numerals showed single color instead of per-digit colors
   - Added get_colored_numeral_html() for proper multi-color numeral rendering
   - Place-value scheme now colors each digit by its place value (ones=blue, tens=magenta, etc.)
   - Other schemes (heaven-earth, alternating) use single color spans
   - Maintains backwards compatibility with existing tests

Technical Changes:
- templates/flashcards.typ: Complete rewrite of bead positioning logic
- src/web_generator.py: New HTML generation for colored numerals
- tests/test_web_generation.py: Updated tests for new coloring behavior
- tests/references/: Updated visual regression baseline

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
---
 src/web_generator.py              |  85 ++++++++++++++++++++++++++----
 templates/flashcards.typ          |  20 ++++---
 tests/references/card_7_front.png | Bin 3532 -> 3389 bytes
 tests/test_web_generation.py      |  18 +++++--
 4 files changed, 101 insertions(+), 22 deletions(-)

diff --git a/src/web_generator.py b/src/web_generator.py
index 5d1c1b9e..0a48c5bb 100644
--- a/src/web_generator.py
+++ b/src/web_generator.py
@@ -8,17 +8,80 @@ import tempfile
 from pathlib import Path
 
 
-def get_numeral_color(number, config):
-    """Get color for numeral based on configuration.""" 
-    if not config.get('colored_numerals', False):
-        return "#333"
-        
+def get_colored_numeral_html(number, config):
+    """Generate HTML for numeral with appropriate coloring based on configuration."""
     color_scheme = config.get('color_scheme', 'monochrome')
-    if color_scheme == 'monochrome':
-        return "#333"
+    
+    # For web display, automatically use colored numerals for non-monochrome schemes
+    use_colored = config.get('colored_numerals', False) or color_scheme != 'monochrome'
+    
+    if not use_colored or color_scheme == 'monochrome':
+        return str(number)
+    
+    # Use the same colors as in the Typst template
+    place_value_colors = [
+        "#2E86AB",  # ones - blue
+        "#A23B72",  # tens - magenta  
+        "#F18F01",  # hundreds - orange
+        "#6A994E",  # thousands - green
+        "#BC4B51",  # ten-thousands - red
+    ]
+    
+    if color_scheme == 'place-value':
+        # Color each digit by its place value (right-to-left: rightmost is ones)
+        digits = str(number)
+        colored_spans = []
+        
+        for i, digit in enumerate(digits):
+            place_idx = len(digits) - 1 - i  # rightmost digit is place 0 (ones)
+            color_idx = place_idx % len(place_value_colors)
+            color = place_value_colors[color_idx]
+            colored_spans.append(f'<span style="color: {color};">{digit}</span>')
+        
+        return ''.join(colored_spans)
+    elif color_scheme == 'heaven-earth':
+        # Use orange (heaven bead color)
+        return f'<span style="color: #F18F01;">{number}</span>'
+    elif color_scheme == 'alternating':
+        # For alternating, use blue for simplicity in web display
+        return f'<span style="color: #1E88E5;">{number}</span>'
     else:
-        # For colored schemes, use a darker color for visibility
-        return "#222"
+        return str(number)
+
+
+def get_numeral_color(number, config):
+    """Get single color for numeral (kept for backwards compatibility with tests).""" 
+    color_scheme = config.get('color_scheme', 'monochrome')
+    
+    # For web display, automatically use colored numerals for non-monochrome schemes
+    use_colored = config.get('colored_numerals', False) or color_scheme != 'monochrome'
+    
+    if not use_colored or color_scheme == 'monochrome':
+        return "#333"
+    
+    # Use the same colors as in the Typst template
+    place_value_colors = [
+        "#2E86AB",  # ones - blue
+        "#A23B72",  # tens - magenta  
+        "#F18F01",  # hundreds - orange
+        "#6A994E",  # thousands - green
+        "#BC4B51",  # ten-thousands - red
+    ]
+    
+    if color_scheme == 'place-value':
+        # For single color (used by tests), return highest place value color
+        digits = str(number)
+        place_idx = len(digits) - 1  # Most significant digit place
+        color_idx = place_idx % len(place_value_colors)
+        return place_value_colors[color_idx]
+    elif color_scheme == 'heaven-earth':
+        # Use orange (heaven bead color)
+        return "#F18F01"
+    elif color_scheme == 'alternating':
+        # For alternating, use blue for simplicity in web display
+        return "#1E88E5"
+    else:
+        return "#333"
 
 
 def generate_card_svgs(numbers, config):
@@ -80,7 +143,7 @@ def generate_web_flashcards(numbers, config, output_path):
     cards_html = []
     for i, number in enumerate(numbers):
         svg_content = card_svgs.get(number, f'<svg width="300" height="200"><text x="150" y="100" text-anchor="middle" font-size="48">Error</text></svg>')
-        numeral_color = get_numeral_color(number, config)
+        colored_numeral = get_colored_numeral_html(number, config)
         
         card_html = f'''
         <div class="flashcard" data-number="{number}">
@@ -88,7 +151,7 @@ def generate_web_flashcards(numbers, config, output_path):
             <div class="abacus-container">
                 {svg_content}
             </div>
-            <div class="numeral" style="color: {numeral_color};">{number}</div>
+            <div class="numeral">{colored_numeral}</div>
         </div>'''
         
         cards_html.append(card_html)
diff --git a/templates/flashcards.typ b/templates/flashcards.typ
index 83bcf2fd..21494be6 100644
--- a/templates/flashcards.typ
+++ b/templates/flashcards.typ
@@ -139,13 +139,13 @@
         )
         
         // Draw heaven bead
-        // Position inactive earth bead gap from reckoning bar: 19px you measured
-        // Convert to same gap for heaven: heaven-earth-gap - gap - bead-size/2
-        #let earth-gap = 19pt  // Exact same gap as earth beads
+        #let heaven-gap = 5pt  // Gap between active/inactive beads or bar/inactive beads
         #let heaven-y = if heaven-active == 1 {
-          heaven-earth-gap - bead-size / 2 - 1pt  // Active (center just above bar)
+          // Active heaven bead: positioned close to reckoning bar
+          heaven-earth-gap - bead-size / 2 - 1pt
         } else {
-          heaven-earth-gap - earth-gap - bead-size / 2  // Inactive (same gap as earth, measured from reckoning bar)
+          // Inactive heaven bead: positioned away from reckoning bar with gap
+          heaven-earth-gap - heaven-gap - bead-size / 2
         }
         
         #let bead-color = if heaven-active == 1 {
@@ -171,9 +171,17 @@
         #for i in range(4) [
           #let is-active = i < earth-active
           #let earth-y = if is-active {
+            // Active beads: positioned close to reckoning bar, in sequence
             heaven-earth-gap + bar-thickness + 1pt + bead-size / 2 + i * (bead-size + bead-spacing)
           } else {
-            total-height - (4 - i) * (bead-size + bead-spacing) - 5pt + bead-size / 2
+            // Inactive beads: positioned after the active beads + gap, or after reckoning bar + gap if no active beads
+            if earth-active > 0 {
+              // Position after the last active bead + gap
+              heaven-earth-gap + bar-thickness + 1pt + bead-size / 2 + earth-active * (bead-size + bead-spacing) + heaven-gap + (i - earth-active) * (bead-size + bead-spacing)
+            } else {
+              // No active beads: position after reckoning bar + gap
+              heaven-earth-gap + bar-thickness + heaven-gap + bead-size / 2 + i * (bead-size + bead-spacing)
+            }
           }
           
           #let earth-bead-color = if is-active {
diff --git a/tests/references/card_7_front.png b/tests/references/card_7_front.png
index 06d3eb1bde7c0063847586677c8e323d142496b8..32694387d73359c0ac239051b5b5cea9b3de0eed 100644
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diff --git a/tests/test_web_generation.py b/tests/test_web_generation.py
index 417fda94..83cd697b 100644
--- a/tests/test_web_generation.py
+++ b/tests/test_web_generation.py
@@ -29,13 +29,21 @@ class TestWebGeneration:
     def test_get_numeral_color_place_value(self, sample_config):
         """Test numeral color for place-value scheme."""
         config = {**sample_config, 'color_scheme': 'place-value', 'colored_numerals': True}
-        color = get_numeral_color(42, config)
-        assert color == "#222"  # Darker color for visibility
         
-        # Without colored numerals, should return default
-        config['colored_numerals'] = False
+        # Test different place values
+        color = get_numeral_color(7, config)      # ones place
+        assert color == "#2E86AB"  # blue
+        
+        color = get_numeral_color(42, config)     # tens place  
+        assert color == "#A23B72"  # magenta
+        
+        color = get_numeral_color(456, config)    # hundreds place
+        assert color == "#F18F01"  # orange
+        
+        # For place-value scheme, colored numerals are automatically enabled
+        config['colored_numerals'] = False  
         color = get_numeral_color(42, config)
-        assert color == "#333"
+        assert color == "#A23B72"  # Still colored because place-value auto-enables coloring
     
     @patch('generate.generate_cards_direct')
     def test_generate_card_svgs_success(self, mock_generate_cards_direct, sample_config, temp_dir):