1 files changed, 45 insertions, 11 deletions

diff --git a/html/tower/js/renderer.js b/html/tower/js/renderer.js
index cf52ebc..f37b5f3 100644
--- a/html/tower/js/renderer.js
+++ b/html/tower/js/renderer.js
@@ -1,7 +1,25 @@
+/**
+ * Rendering Module
+ * 
+ * This module handles all game rendering operations using HTML5 Canvas.
+ * Demonstrates key game development patterns:
+ * 1. Layer-based rendering
+ * 2. Particle systems
+ * 3. Visual state feedback
+ * 4. Canvas state management
+ */
+
+/**
+ * Renders the game grid with path and hover previews
+ * Implements visual feedback for player actions
+ * 
+ * @param {CanvasRenderingContext2D} ctx - Canvas rendering context
+ * @param {Array<Array<string>>} grid - Game grid state
+ */
 function renderGrid(ctx, grid) {
     const cellSize = canvas.width / 20;
     
-    // Draw grid lines
+    // Draw grid lines for visual reference
     ctx.strokeStyle = '#ccc';
     ctx.lineWidth = 1;
     
@@ -19,7 +37,7 @@ function renderGrid(ctx, grid) {
         ctx.stroke();
     }
     
-    // Draw cells
+    // Render grid cells with path highlighting
     grid.forEach((row, y) => {
         row.forEach((cell, x) => {
             if (cell === 'path') {
@@ -29,12 +47,13 @@ function renderGrid(ctx, grid) {
         });
     });
 
-    // Draw hover preview
+    // Render tower placement preview
     if (gameState.phase === GamePhase.PLACEMENT && draggedTowerType && hoverCell) {
         const tower = TowerTypes[draggedTowerType];
         const canPlace = grid[hoverCell.y][hoverCell.x] === 'empty' &&
                         gameState.playerCurrency >= tower.cost;
         
+        // Visual feedback for placement validity
         ctx.fillStyle = canPlace ? tower.color + '80' : 'rgba(255, 0, 0, 0.3)';
         ctx.fillRect(
             hoverCell.x * cellSize,
@@ -43,7 +62,7 @@ function renderGrid(ctx, grid) {
             cellSize
         );
         
-        // Draw range preview
+        // Range indicator preview
         ctx.beginPath();
         ctx.arc(
             (hoverCell.x + 0.5) * cellSize,
@@ -57,19 +76,27 @@ function renderGrid(ctx, grid) {
     }
 }
 
+/**
+ * Renders all enemies with health indicators and effects
+ * Implements visual state representation
+ * 
+ * @param {CanvasRenderingContext2D} ctx - Canvas rendering context
+ * @param {Array<Object>} enemies - Array of enemy objects
+ */
 function renderEnemies(ctx, enemies) {
     const cellSize = canvas.width / 20;
     
     enemies.forEach(enemy => {
+        // Health-based opacity for visual feedback
         const healthPercent = enemy.currentHealth / enemy.maxHealth;
         const opacity = 0.3 + (healthPercent * 0.7);
         
-        // Use enemy type color
+        // Dynamic color based on enemy state
         ctx.fillStyle = `${EnemyTypes[enemy.type].color}${Math.floor(opacity * 255).toString(16).padStart(2, '0')}`;
         ctx.strokeStyle = 'rgba(0, 0, 0, 0.8)';
         ctx.lineWidth = 2;
         
-        // Draw enemy body
+        // Enemy body
         ctx.beginPath();
         ctx.arc(
             (enemy.position.x + 0.5) * cellSize,
@@ -81,7 +108,7 @@ function renderEnemies(ctx, enemies) {
         ctx.fill();
         ctx.stroke();
         
-        // Draw range indicator for ranged enemies
+        // Range indicator for special enemy types
         if (EnemyTypes[enemy.type].isRanged) {
             ctx.beginPath();
             ctx.arc(
@@ -97,6 +124,13 @@ function renderEnemies(ctx, enemies) {
     });
 }
 
+/**
+ * Renders game UI elements with clean state management
+ * Implements heads-up display (HUD) pattern
+ * 
+ * @param {CanvasRenderingContext2D} ctx - Canvas rendering context
+ * @param {Object} gameState - Current game state
+ */
 function renderUI(ctx, gameState) {
     const padding = 20;
     const lineHeight = 30;
@@ -110,17 +144,17 @@ function renderUI(ctx, gameState) {
     // Reset any transformations
     ctx.setTransform(1, 0, 0, 1, 0, 0);
     
-    // Draw semi-transparent background
+    // Semi-transparent background for readability
     ctx.fillStyle = 'rgba(255, 255, 255, 0.8)';
     ctx.fillRect(0, 0, width, height + padding);
     
-    // Set text properties
+    // Text rendering setup
     ctx.fillStyle = 'black';
     ctx.font = '20px Arial';
     ctx.textAlign = 'left';
-    ctx.textBaseline = 'top';  // Add this to ensure consistent vertical alignment
+    ctx.textBaseline = 'top';
     
-    // Draw UI elements
+    // Game state information
     ctx.fillText(`Level: ${gameState.level}`, padding, startY);
     ctx.fillText(`Currency: $${gameState.currency}`, padding, startY + lineHeight);
     ctx.fillText(`Phase: ${gameState.phase}`, padding, startY + lineHeight * 2);