/**** * Plugins ****/ var tween = LK.import("@upit/tween.v1"); /**** * Classes ****/ var EnemyBullet = Container.expand(function () { var self = Container.call(this); var bulletGraphics = self.attachAsset('enemyBullet', { anchorX: 0.5, anchorY: 0.5 }); self.speed = 8; self.update = function () { self.y += self.speed; }; return self; }); var EnemyPlane = Container.expand(function () { var self = Container.call(this); var planeGraphics = self.attachAsset('enemyPlane', { anchorX: 0.5, anchorY: 0.5 }); planeGraphics.rotation = Math.PI; self.speed = 2; self.lastShot = 0; self.shotInterval = 120; // 2 seconds at 60fps self.health = 1; self.update = function () { // Move down vertically self.y += self.speed; // Shooting logic self.lastShot++; if (self.lastShot >= self.shotInterval) { self.shoot(); self.lastShot = 0; } }; self.shoot = function () { if (self.parent) { var bullet = new EnemyBullet(); bullet.x = self.x; bullet.y = self.y + 40; bullet.lastY = bullet.y; enemyBullets.push(bullet); game.addChild(bullet); LK.getSound('enemyShoot').play(); } }; return self; }); var PlayerBullet = Container.expand(function () { var self = Container.call(this); var bulletGraphics = self.attachAsset('playerBullet', { anchorX: 0.5, anchorY: 0.5 }); self.speed = -12; self.update = function () { self.y += self.speed; }; return self; }); var PlayerPlane = Container.expand(function () { var self = Container.call(this); var planeGraphics = self.attachAsset('playerPlane', { anchorX: 0.5, anchorY: 0.5 }); self.health = 3; self.lastShot = 0; self.shotCooldown = 10; // shots per second limit self.shoot = function () { if (self.lastShot <= 0) { var bullet = new PlayerBullet(); bullet.x = self.x; bullet.y = self.y - 50; bullet.lastY = bullet.y; playerBullets.push(bullet); game.addChild(bullet); LK.getSound('shoot').play(); self.lastShot = self.shotCooldown; } }; self.dropBomb = function () { if (specialBombsAvailable > 0) { // Find nearest enemy plane var nearestEnemy = null; var nearestDistance = Infinity; for (var i = 0; i < enemyPlanes.length; i++) { var enemy = enemyPlanes[i]; var dx = self.x - enemy.x; var dy = self.y - enemy.y; var distance = Math.sqrt(dx * dx + dy * dy); if (distance < nearestDistance) { nearestDistance = distance; nearestEnemy = enemy; } } // If we found an enemy, destroy it directly if (nearestEnemy) { // Award score for bomb kill LK.setScore(LK.getScore() + 20); scoreTxt.setText('Score: ' + LK.getScore()); // Track fighter jets hit fighterJetsHit++; if (fighterJetsHit >= 5) { // Award special bomb every 5 hits specialBombsAvailable++; bombTxt.setText('Bombs: ' + specialBombsAvailable); fighterJetsHit = 0; // Reset counter } // Destroy enemy with explosion LK.effects.flashObject(nearestEnemy, 0xff0000, 300); LK.getSound('explosion').play(); createExplosion(nearestEnemy); // Remove from enemy planes array for (var j = enemyPlanes.length - 1; j >= 0; j--) { if (enemyPlanes[j] === nearestEnemy) { enemyPlanes.splice(j, 1); break; } } // Create flash effect to show bomb was used LK.effects.flashScreen(0xFFFF00, 300); } specialBombsAvailable--; bombTxt.setText('Bombs: ' + specialBombsAvailable); LK.getSound('shoot').play(); } }; self.update = function () { if (self.lastShot > 0) { self.lastShot--; } }; return self; }); /**** * Initialize Game ****/ var game = new LK.Game({ backgroundColor: 0x87CEEB }); /**** * Game Code ****/ // Game variables var playerPlane; var enemyPlanes = []; var playerBullets = []; var enemyBullets = []; var specialBombs = []; var enemySpawnTimer = 0; var enemySpawnInterval = 180; // 3 seconds at 60fps var difficultyTimer = 0; var speedIncreaseTimer = 0; var baseEnemySpeed = 2; var dragNode = null; var enemySpawnCount = 1; // Number of enemy planes to spawn at once var enemyIncreaseTimer = 0; var fighterJetsHit = 0; // Track number of fighter jets hit var specialBombsAvailable = 0; // Track available special bombs var lastTapTime = 0; // For double-tap detection // Explosion effect function function createExplosion(target) { // Create explosion animation using tween tween(target, { scaleX: 2, scaleY: 2, alpha: 0, rotation: target.rotation + Math.PI }, { duration: 300, easing: tween.easeOut, onFinish: function onFinish() { target.destroy(); } }); } // Create score display var scoreTxt = new Text2('Score: 0', { size: 80, fill: 0xFFFFFF }); scoreTxt.anchor.set(0.5, 0); LK.gui.top.addChild(scoreTxt); // Create life bar display var lifeTxt = new Text2('Lives: 3', { size: 80, fill: 0xFF0000 }); lifeTxt.anchor.set(0.5, 0); lifeTxt.x = 0; lifeTxt.y = 100; LK.gui.top.addChild(lifeTxt); // Create time bar display var timeTxt = new Text2('Time: 0:00', { size: 80, fill: 0xFFFF00 }); timeTxt.anchor.set(0.5, 0); timeTxt.x = 0; timeTxt.y = 200; LK.gui.top.addChild(timeTxt); // Create special bomb display var bombTxt = new Text2('Bombs: 0', { size: 80, fill: 0x00FF00 }); bombTxt.anchor.set(0.5, 0); bombTxt.x = 0; bombTxt.y = 300; LK.gui.top.addChild(bombTxt); // Create player plane playerPlane = game.addChild(new PlayerPlane()); playerPlane.x = 1024; playerPlane.y = 2400; // Game event handlers function handleMove(x, y, obj) { if (dragNode) { // Keep player plane within screen bounds dragNode.x = Math.max(60, Math.min(1988, x)); dragNode.y = Math.max(40, Math.min(2692, y)); } } game.move = handleMove; game.down = function (x, y, obj) { // Start dragging player plane dragNode = playerPlane; handleMove(x, y, obj); // Check for double-tap to drop bomb var currentTime = LK.ticks; if (currentTime - lastTapTime < 30) { // 30 ticks = 0.5 seconds // Double-tap detected - drop bomb playerPlane.dropBomb(); } else { // Single tap - shoot bullet playerPlane.shoot(); } lastTapTime = currentTime; }; game.up = function (x, y, obj) { dragNode = null; }; // Main game update loop game.update = function () { // Update timers enemySpawnTimer++; difficultyTimer++; speedIncreaseTimer++; // Update time display var gameTimeSeconds = Math.floor(LK.ticks / 60); var minutes = Math.floor(gameTimeSeconds / 60); var seconds = gameTimeSeconds % 60; var timeString = minutes + ':' + (seconds < 10 ? '0' : '') + seconds; timeTxt.setText('Time: ' + timeString); // Increase difficulty over time if (difficultyTimer % 1800 == 0) { // Every 30 seconds enemySpawnInterval = Math.max(60, enemySpawnInterval - 20); } // Increase enemy plane speed every 30 seconds if (speedIncreaseTimer % 1800 == 0) { // Every 30 seconds (1800 ticks at 60fps) baseEnemySpeed += 0.5; // Update speed for all existing enemy planes for (var k = 0; k < enemyPlanes.length; k++) { enemyPlanes[k].speed = baseEnemySpeed; } } // Increase enemy spawn count every 45 seconds enemyIncreaseTimer++; if (enemyIncreaseTimer % 2700 == 0) { // Every 45 seconds (2700 ticks at 60fps) enemySpawnCount++; } // Spawn enemy planes if (enemySpawnTimer >= enemySpawnInterval) { // Spawn multiple enemy planes based on enemySpawnCount for (var spawnIndex = 0; spawnIndex < enemySpawnCount; spawnIndex++) { var enemy = new EnemyPlane(); enemy.x = Math.random() * 1800 + 124; enemy.y = -100 - spawnIndex * 150; // Offset vertically to avoid overlap enemy.speed = baseEnemySpeed; enemy.lastY = enemy.y; enemy.lastIntersecting = false; enemyPlanes.push(enemy); game.addChild(enemy); } enemySpawnTimer = 0; } // Update player bullets for (var i = playerBullets.length - 1; i >= 0; i--) { var bullet = playerBullets[i]; if (bullet.lastY === undefined) bullet.lastY = bullet.y; // Remove bullets that go off screen if (bullet.lastY >= -50 && bullet.y < -50) { bullet.destroy(); playerBullets.splice(i, 1); continue; } // Check collision with enemy planes var hitEnemy = false; for (var j = enemyPlanes.length - 1; j >= 0; j--) { var enemy = enemyPlanes[j]; if (bullet.intersects(enemy)) { // Hit enemy LK.setScore(LK.getScore() + 10); scoreTxt.setText('Score: ' + LK.getScore()); // Track fighter jets hit fighterJetsHit++; if (fighterJetsHit >= 5) { // Award special bomb every 5 hits specialBombsAvailable++; bombTxt.setText('Bombs: ' + specialBombsAvailable); fighterJetsHit = 0; // Reset counter } // Destroy enemy with explosion LK.effects.flashObject(enemy, 0xff0000, 300); LK.getSound('explosion').play(); createExplosion(enemy); enemyPlanes.splice(j, 1); // Destroy bullet bullet.destroy(); playerBullets.splice(i, 1); hitEnemy = true; break; } } if (!hitEnemy) { bullet.lastY = bullet.y; } } // Update enemy bullets for (var i = enemyBullets.length - 1; i >= 0; i--) { var bullet = enemyBullets[i]; if (bullet.lastY === undefined) bullet.lastY = bullet.y; // Remove bullets that go off screen if (bullet.lastY <= 2782 && bullet.y > 2782) { bullet.destroy(); enemyBullets.splice(i, 1); continue; } // Check collision with player if (bullet.intersects(playerPlane)) { // Player hit - reduce life playerPlane.health--; lifeTxt.setText('Lives: ' + playerPlane.health); // Flash player plane red LK.effects.flashObject(playerPlane, 0xff0000, 500); LK.getSound('explosion').play(); // Remove the bullet that hit the player bullet.destroy(); enemyBullets.splice(i, 1); // Check if player is dead if (playerPlane.health <= 0) { createExplosion(playerPlane); LK.effects.flashScreen(0xff0000, 1000); LK.setTimeout(function () { LK.showGameOver(); }, 300); return; } continue; } bullet.lastY = bullet.y; } // Update enemy planes for (var i = enemyPlanes.length - 1; i >= 0; i--) { var enemy = enemyPlanes[i]; if (enemy.lastY === undefined) enemy.lastY = enemy.y; // Remove enemies that go off screen if (enemy.lastY <= 2782 && enemy.y > 2782) { enemy.destroy(); enemyPlanes.splice(i, 1); continue; } // Check collision with player if (enemy.intersects(playerPlane)) { // Player hit by enemy plane - reduce life playerPlane.health--; lifeTxt.setText('Lives: ' + playerPlane.health); // Flash player plane red LK.effects.flashObject(playerPlane, 0xff0000, 500); LK.getSound('explosion').play(); // Remove the enemy that hit the player createExplosion(enemy); enemyPlanes.splice(i, 1); // Check if player is dead if (playerPlane.health <= 0) { createExplosion(playerPlane); LK.effects.flashScreen(0xff0000, 1000); LK.setTimeout(function () { LK.showGameOver(); }, 300); return; } continue; } enemy.lastY = enemy.y; } // Victory condition - survive for high score if (LK.getScore() >= 500) { LK.showYouWin(); } }; // Start background music LK.playMusic('bgmusic');