// Create a new display instance const display = new Display(); // Start the game with default dimensions (480x270) display.start(); // Or specify custom dimensions display.start(800, 600); // With custom parent element const gameContainer = document.getElementById('game-container'); display.start(800, 600, gameContainer); 

class Display { constructor() { this.canvas = document.createElement("canvas"); this.context = this.canvas.getContext("2d"); this.frameNo = 0; // Frame counter this.keys = []; // Keyboard state array this.x = false; // Mouse/touch X this.y = false; // Mouse/touch Y this.interval = null; // Game loop interval this.tile = null; // Tile definitions this.map = null; // Map data this.tileFace = null; // TileMap instance this.scene = 0; // Current scene index this.camera = new Camera(); // Camera instance } } 

// Start the game loop display.start(width = 480, height = 270, parent = document.body); // Stop the game loop display.stop(); // Example: Full game lifecycle const display = new Display(); display.start(800, 600); // Later, when pausing the game display.stop(); // Resume the game display.start(); // Maintains previous dimensions 

// Background colors and gradients display.backgroundColor("navy"); // Solid color display.lgradient("bottom", "blue", "lightblue"); // Linear gradient display.rgradient("blue", "darkblue"); // Radial gradient // Border styling display.borderColor("white"); display.borderSize("2px"); display.borderStyle("solid"); // Text styling display.fontColor("white"); // Fullscreen control display.fullScreen(); // Enter fullscreen mode display.exitScreen(); // Exit fullscreen mode // Canvas scaling display.scale(1024, 768); // Resize canvas dimensions 

// The internal update method handles: display.updat() { this.clear(); // Clear canvas this.frameNo += 1; // Increment frame counter this.context.save(); // Save context state this.context.translate(-this.camera.x, -this.camera.y); // Apply camera try { update(); // Global update function } catch (e) { // Handle errors silently } // Render components in current scene comm.forEach(component => { if(component.scene == this.scene) { component.x.move(); component.x.update(this.context); } }); this.context.restore(); // Restore context state } 

// Add components to specific scenes const player = new Component(30, 30, "blue", 100, 100, "rect"); const menuBg = new Component(800, 600, "darkblue", 0, 0, "rect"); const gameBg = new Component(800, 600, "lightblue", 0, 0, "rect"); // Add to scenes (scene 0 = menu, scene 1 = game) display.add(menuBg, 0); display.add(gameBg, 1); display.add(player, 1); // Switch between scenes display.scene = 0; // Show menu display.scene = 1; // Show game // Check current scene console.log("Current scene:", display.scene); 

// Keyboard states are stored in display.keys array function update() { // Arrow keys (key codes: 37=left, 38=up, 39=right, 40=down) if (display.keys[37]) { /* Left arrow pressed */ } if (display.keys[39]) { /* Right arrow pressed */ } if (display.keys[38]) { /* Up arrow pressed */ } if (display.keys[40]) { /* Down arrow pressed */ } // Spacebar (key code 32) if (display.keys[32]) { /* Space pressed */ } // Letter keys (65='A', 66='B', etc.) if (display.keys[65]) { /* A key pressed */ } if (display.keys[87]) { /* W key pressed */ } } // Common key codes: // 13: Enter, 27: Escape, 32: Space, 16: Shift, 17: Ctrl // 65-90: A-Z, 48-57: 0-9 

function update() { // Mouse/touch position (relative to canvas) if (display.x !== false && display.y !== false) { console.log("Input at:", display.x, display.y); } // Check if mouse/touch is currently down if (display.x !== false) { // Input is active (mouse down or touch) } } // Global mouse object (alternative access) console.log("Mouse position:", mouse.x, mouse.y); console.log("Mouse down:", mouse.down); 

// Define tiles (index 0 is reserved for empty) const tiles = [ new Component(0, 0, "green", 0, 0, "rect"), // Index 1 - ground new Component(0, 0, "gray", 0, 0, "rect") // Index 2 - wall ]; // Create map layout const mapLayout = [ [2, 2, 2, 2, 2], [2, 1, 1, 1, 2], [2, 1, 1, 1, 2], [2, 2, 2, 2, 2] ]; // Assign to display and create TileMap display.tile = tiles; display.map = mapLayout; display.tileMap(); // Creates tileFace instance display.tileFace.show(); // Renders the tilemap 

// Access the TileMap instance const tilemap = display.tileFace; // Check collisions if (tilemap.crashWith(player)) { // Player collided with any tile } if (tilemap.crashWith(player, 2)) { // Player collided with wall tiles (id=2) } // Get specific tiles const groundTiles = tilemap.tiles(1); // All ground tiles const specificTile = tilemap.rTile(2, 3); // Tile at column 2, row 3 // Modify tilemap dynamically tilemap.add(1, 2, 2); // Add ground at position (2,2) tilemap.remove(3, 1); // Remove tile at position (3,1) 

// Camera is automatically created with Display const camera = display.camera; // Set world boundaries camera.worldWidth = 2000; camera.worldHeight = 1500; // Follow a component camera.follow(player, false); // Direct follow (no smoothing) camera.follow(player, true); // Smooth follow (lerping) // Manual camera control camera.x = 500; // Set camera position directly camera.y = 300; // Camera properties console.log("Camera position:", camera.x, camera.y); console.log("World size:", camera.worldWidth, camera.worldHeight); 

// Complete game initialization example const display = new Display(); // Setup display display.start(800, 600); display.lgradient("bottom", "#87CEEB", "#E0F7FA"); display.borderColor("#333"); display.borderSize("1px"); // Create game objects const player = new Component(30, 30, "red", 100, 100, "rect"); player.physics = true; player.gravity = 0.5; display.add(player); // Setup camera display.camera.worldWidth = 1600; display.camera.worldHeight = 1200; display.camera.follow(player, true); // Global update function function update() { // Input handling if (display.keys[37]) player.speedX = -5; // Left if (display.keys[39]) player.speedX = 5; // Right if (display.keys[38]) player.speedY = -10; // Jump // Game logic here... } 

// Menu scene (scene 0) const menuBg = new Component(800, 600, "darkblue", 0, 0, "rect"); const startButton = new Component(200, 50, "green", 300, 300, "rect"); startButton.text = "Start Game"; display.add(menuBg, 0); display.add(startButton, 0); // Game scene (scene 1) const gameBg = new Component(800, 600, "lightblue", 0, 0, "rect"); const player = new Component(30, 30, "red", 100, 100, "rect"); display.add(gameBg, 1); display.add(player, 1); // Scene switching logic function update() { if (display.scene === 0 && startButton.clicked()) { display.scene = 1; // Switch to game scene } if (display.scene === 1 && display.keys[27]) { // ESC key display.scene = 0; // Switch to menu scene } } 

// 1. Use appropriate frame rate // Default is 50 FPS (20ms interval), adjust as needed display.interval = setInterval(() => display.updat(), 33); // ~30 FPS // 2. Minimize context operations in update loop // Bad: Creating gradients every frame // Good: Create gradients once in setup // 3. Use scene system to disable rendering of invisible objects // Only objects in current scene are rendered // 4. Leverage TileMap for static level geometry // More efficient than individual Component objects 

// Proper cleanup when destroying the game function destroyGame() { display.stop(); // Stop game loop display.canvas.remove(); // Remove canvas from DOM // Additional cleanup as needed } // Remove components properly function removeComponent(component) { const index = comm.findIndex(c => c.x === component); if (index !== -1) { comm.splice(index, 1); } } 

// Access the raw canvas context for custom drawing const ctx = display.context; // Custom rendering example function customRender() { ctx.fillStyle = "rgba(255, 0, 0, 0.5)"; ctx.beginPath(); ctx.arc(400, 300, 50, 0, Math.PI * 2); ctx.fill(); } // Call in update function function update() { customRender(); // Other game logic... } 

// Create multiple game instances on same page const game1 = new Display(); const game2 = new Display(); game1.start(400, 300, document.getElementById('game1-container')); game2.start(400, 300, document.getElementById('game2-container')); // Each has independent state, input, and rendering 

// Ensure parent element exists and is visible const container = document.getElementById('game-container'); if (container) { display.start(800, 600, container); } else { console.error("Container element not found!"); } 

// Check if event listeners are properly set // Verify key codes are correct function update() { console.log("Keys pressed:", display.keys.filter(k => k)); // Debugging output to see what keys are detected } 

// Reduce frame rate for better performance display.interval = setInterval(() => display.updat(), 33); // 30 FPS // Use fewer active components // Implement object pooling for frequently created/destroyed objects