Top-down alien shooter · gemma-4-26b-a4b-it
Using the pre-provided phaser.min.js (global Phaser), build a top-down alien shooter: move with WASD, aim and fire at waves of advancing aliens, with health, score, and increasing difficulty. Use ONLY procedurally generated graphics, no external image or audio assets.
transcript · 10 messages
Using the pre-provided phaser.min.js (global Phaser), build a top-down alien shooter: move with WASD, aim and fire at waves of advancing aliens, with health, score, and increasing difficulty. Use ONLY procedurally generated graphics, no external image or audio assets.
thinking
The user wants a single-page web app (index.html) containing a top-down alien shooter game built with Phaser. Constraints: - All in one file: `index.html`. - CSS in `<style>`, JS in `<script>`. - No external resources, CDNs, or network requests. - Use the pre-provided `phaser.min.js` (it's already in the current directory). - Procedurally generated graphics (no external images). - No external audio. - Gameplay: WASD move, aim and fire at waves of advancing aliens, health, score, increasing difficulty. Plan: 1. Check if `phaser.min.js` exists in the current directory. 2. Create the `index.html` with the full game implementation. Game mechanics details: - Player: A triangle or simple shape. - Movement: WASD. - Aiming: Mouse. - Firing: Click/Space (let's use mouse click). - Aliens: Different colors/shapes, move towards player. - Waves: More aliens and faster/stronger aliens as time goes on. - Graphics: Use Phaser's graphics objects to create textures at runtime. - UI: Score and Health displayed on screen. - Game States: Start, Playing, Game Over. Let's check the directory first.
{"command":"ls phaser.min.js"}phaser.min.js
index.html (8477 bytes)Successfully wrote 8477 bytes to index.html
{"edits":[{"newText":"<!DOCTYPE html>\n<<hthtml lang=\"en\">\n<<hehead>\n <<memeta charset=\"UTF-8\">\n <<memeta name=\"viewport\" conValidation failed for tool "edit": - path: must have required properties path - root: must not have additional properties - edits.0.oldText: must have required properties oldText - edits.0: must not have additional properties Received arguments: { "edits": [ { "newText": "<!DOCTYPE html>\n<<hthtml lang=\"en\">\n<<hehead>\n <<memeta charset=\"UTF-8\">\n <<memeta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\">\n <<tittitle>Alien Shooter</title>\n <<scriscript src=\"phaser.min.js\"></script>\n <<stystyle>\n body {\n margin: 0;\n padding: 0;\n background-color: #000;\n display: flex;\n justify-content: center;\n align-items: center;\n height: 100vh;\n overflow: hidden;\n }\n canvas {\n box-shadow: 0 0 20px rgba(0, 255, 0, 0.2);\n }\n </style>\n</head>\n<body>\n<<scriscript>\nconst config = {\n type: Phaser.AUTO,\n width: 800,\n height: 600,\n physics: {\n default: 'arcade',\n arcade: {\n gravity: { y: 0 },\n debug: false\n }\n },\n scene: {\n preload: preload,\n create: create,\n update: update\n }\n};\n\nconst game = new Phaser.Game(config);\n\nlet player;\nlet cursors;\nlet wasd;\nlet bullets;\nlet aliens;\nlet score = 0;\nlet health = 100;\nlet scoreText;\nlet healthText;\nlet waveText;\nlet wave = 1;\nlet lastFired = 0;\nlet gameOver = false;\n\nfunction preload() {\n // No external assets to load\n}\n\nfunction create() {\n // --- Procedural Graphics Generation ---\n \n // Player Texture (a blue spaceship)\n const playerGraphics = this.make.graphics({ x: 0, y: 0, add: false });\n playerGraphics.fillStyle(0x00ffff, 1);\n playerGraphics.fillTriangle(0, 32, 16, 0, 32, 32); // Triangle shape\n playerGraphics.lineStyle(2, 0xffffff, 1);\n playerGraphics.strokeTriangle(0, 32, 16, 0, 32, 32);\n playerGraphics.generateTexture('player', 32, 32);\n\n // Bullet Texture (a small yellow glow)\n const bulletGraphics = this.make.graphics({ x: 0, y: 0, add: false });\n bulletGraphics.fillStyle(0xffff00, 1);\n bulletGraphics.fillCircle(4, 4, 4);\n bulletGraphics.generateTexture('bullet', 8, 8);\n\n // Alien Texture (a green blob)\n const alienGraphics = this.make.graphics({ x: 0, y: 0, add: false });\n alienGraphics.fillStyle(0x00ff00, 1);\n alienGraphics.fillCircle(16, 16, 16);\n alienGraphics.lineStyle(2, 0xffffff, 1);\n alienGraphics.strokeCircle(16, 16, 16);\n // Eye\n alienGraphics.fillStyle(0xff0000, 1);\n alienGraphics.fillCircle(10, 12, 3);\n alienGraphics.fillCircle(22, 12, 3);\n alienGraphics.generateTexture('alien', 32, 32);\n\n // Particle for explosions\n const particleGraphics = this.make.graphics({ x: 0, y: 0, add: false });\n particleGraphics.fillStyle(0xffa500, 1);\n particleGraphics.fillRect(0, 0, 4, 4);\n particleGraphics.generateTexture('particle', 4, 4);\n\n // --- Game Objects ---\n\n // Player setup\n player = this.physics.add.sprite(400, 300, 'player');\n player.setCollideWorldBounds(true);\n\n // Groups\n bullets = this.physics.add.group({\n defaultKey: 'bullet',\n maxSize: 30\n });\n\n aliens = this.physics.add.group();\n\n // Input\n wasd = this.input.keyboard.addKeys({\n up: Phaser.Input.Keyboard.KeyCodes.W,\n down: Phaser.Input.Keyboard.KeyCodes.S,\n left: Phaser.Input.Keyboard.KeyCodes.A,\n right: Phaser.Input.Keyboard.KeyCodes.D\n });\n \n // UI\n scoreText = this.add.text(16, 16, 'Score: 0', { fontSize: '24px', fill: '#fff', fontFamily: 'Arial' });\n healthText = this.add.text(16, 45, 'Health: 100', { fontSize: '24px', fill: '#f00', fontFamily: 'Arial' });\n waveText = this.add.text(350, 16, 'Wave: 1', { fontSize: '24px', fill: '#0f0', fontFamily: 'Arial' });\n\n // Collisions\n this.physics.add.overlap(bullets, aliens, hitAlien, null, this);\n this.physics.add.overlap(player, aliens, hitPlayer, null, this);\n\n // Start first wave\n spawnWave(this, wave);\n}\n\nfunction update(time) {\n if (gameOver) return;\n\n // Movement\n player.setVelocity(0);\n const speed = 200;\n\n if (wasd.left.isDown) {\n player.setVelocityX(-speed);\n } else if (wasd.right.isDown) {\n player.setVelocityX(speed);\n }\n\n if (wasd.up.isDown) {\n player.setVelocityY(-speed);\n } else if (wasd.down.isDown) {\n player.setVelocityY(speed);\n }\n\n // Aiming - player faces the mouse\n const pointer = this.input.activePointer;\n const angle = Phaser.Math.Angle.Between(player.x, player.y, pointer.x, pointer.y);\n player.setRotation(angle + Math.PI/2);\n\n // Auto-fire if pointer is held\n if (pointer.isDown && time > lastFired) {\n shoot.call(this);\n lastFired = time + 150; // Fire rate\n }\n\n // Alien behavior: Move towards player\n aliens.getChildren().forEach(alien => {\n this.physics.moveToObject(alien, player, 50 + (wave * 5));\n });\n\n // Check if wave is cleared\n if (aliens.countActive() === 0 && !gameOver) {\n wave++;\n waveText.setText('Wave: ' + wave);\n spawnWave(this, wave);\n }\n}\n\nfunction shoot() {\n const pointer = this.input.activePointer;\n const bullet = bullets.get(player.x, player.y);\n\n if (bullet) {\n bullet.setActive(true);\n bullet.setVisible(true);\n bullet.body.enable(true);\n \n const angle = Phaser.Math.Angle.Between(player.x, player.y, pointer.x, pointer.y);\n this.physics.velocityFromRotation(angle, 400, bullet.body.velocity);\n \n // Ensure bullet doesn't live forever\n this.time.delayedCall(2000, () => {\n if(bullet.active) {\n bullet.setActive(false);\n bullet.setVisible(false);\n bullet.body.enable(false);\n }\n });\n }\n}\n\nfunction spawnWave(scene, waveNum) {\n const count = 5 + (waveNum * 2);\n let spawned = 0;\n let attempts = 0;\n\n while (spawned << cou count && attempts < 100) {\n attempts++;\n // Pick a random side of the screen\n const side = Phaser.Math.Between(0, 3);\n let x, y;\n if (side === 0) { x = Phaser.Math.Between(0, 800); y = -32; } // Top\n else if (side === 1) { x = Phaser.Math.Between(0, 800); y = 632; } // Bottom\n else if (side === 2) { x = -32; y = Phaser.Math.Between(0, 600); } // Left\n else { x = 832; y = Phaser.Math.Between(0, 600); } // Right\n\n if (Phaser.Math.Distance.Between(x, y, player.x, player.y) > 150) {\n const alien = aliens.create(x, y, 'alien');\n alien.setBounce(1);\n alien.setCollideWorldBounds(true);\n spawned++;\n }\n }\n}\n\nfunction hitAlien(bullet, alien) {\n // Create explosion particles\n const particles = this.add.particles(0, 0, 'particle', {\n speed: { min: -100, max: 100 },\n angle: { min: 0, max: 360 },\n scale: { start: 1, end: 0 },\n blendMode: 'ADD',\n lifespan: 500,\n quantity: 10,\n emitting: false\n });\n particles.explode(alien.x, alien.y);\n\n bullet.destroy();\n alien.destroy();\n \n score += 10;\n scoreText.setText('Score: ' + score);\n}\n\nfunction hitPlayer(player, alien) {\n health -= 10;\n healthText.setText('Health: ' + health);\n alien.destroy();\n\n // Flash player red\n this.cameras.main.shake(100, 0.01);\n\n if (health <= 0) {\n endGame.call(this);\n }\n}\n\nfunction endGame() {\n gameOver = true;\n this.physics.pause();\n player.setTint(0xff0000);\n \n this.add.text(400, 300, 'GAME OVER', { \n fontSize: '64px', \n fill: '#f00', \n fontFamily: 'Arial' \n }).setOrigin(0.5);\n \n this.add.text(400, 360, 'Click to Restart', { \n fontSize: '32px', \n fill: '#fff', \n fontFamily: 'Arial' \n }).setOrigin(0.5);\n\n this.input.once('pointerdown', () => {\n location.reload();\n });\n}\n\n</script>\n</body>\n</html>\n", "path": "index.html" } ], "type": "edit" }
thinking
The previous `edit` failed because I messed up the `oldText` and the structure of the `edit` call (I included a bunch of weird characters like `<<` and `<<hthtml` in my attempt, which was a mistake). I should have just used `write` to rewrite the file correctly or used a proper `edit`. Since I want to rewrite the whole file to ensure it's clean and correct, I will use `write` again with the correct content. I will fix the code and ensure it's a valid `index.html`. Changes needed in the code: 1. Correct the HTML tags (they were mangled in the previous attempt). 2. Fix the `spawnWave` function (it had a typo `spawned << cou count`). 3. Ensure the `bullet.body.enable(true)` and similar logic is correct for a group. 4. Fix the particle explosion logic. 5. Ensure the game is self-contained and uses `phaser.min.js`. Let's rewrite `index.html` from scratch with a clean version.
index.html (7684 bytes)Successfully wrote 7684 bytes to index.html
thinking
Okay, I have written the `index.html` file. I should verify that the code is complete and follows all requirements.
Requirements checklist:
- Single-page web app: Yes.
- Written into `index.html`: Yes.
- CSS in `<style>`: Yes.
- JS in `<script>`: Yes.
- No external resources/CDNs/network requests: Yes.
- Uses `phaser.min.js`: Yes.
- Top-down alien shooter: Yes.
- WASD movement: Yes.
- Aim and fire: Yes (mouse/pointer).
- Waves of advancing aliens: Yes.
- Health, score, increasing difficulty: Yes.
- Procedurally generated graphics: Yes (using Phaser's Graphics object to create textures).
The `spawnWave` function has been fixed.
The particle explosion logic has been fixed.
The bullet management (using `bullets.get`) has been improved with `body.enable(true)` and disabling it when not in use.
One small thing to check: `bullet.destroy()` in `hitAlien` might conflict with the `maxSize` of the group if I don't use `bullets.killAndHide(bullet)` or similar, but `destroy()` should be fine if I want them gone. However, using `bullets.get` with a `maxSize` usually means you should reuse them. Let's refine `hitAlien` slightly to be safer with the pool if needed, but `destroy()` is also acceptable in Phaser for simple games. Actually, `bullets.get` returns a new sprite if the pool is not full, but if it's full it might return null or something else depending on configuration.
Wait, `bullets = this.physics.add.group({ defaultKey: 'bullet', maxSize: 50 });`. When `bullets.get()` is called, it returns a sprite from the pool. If I call `bullet.destroy()`, it's removed from the group and the pool size effectively decreases.
Let's adjust `hitAlien` to use `bullets.killAndHide(bullet)` instead of `bullet.destroy()` to properly utilize the pool, and ensure `shoot` handles it correctly.
Actually, I'll just use `bullet.destroy()` for simplicity unless I hit the limit. But a better way is:
```javascript
function hitAlien(bullet, alien) {
// ...
bullet.destroy(); // This is fine, it's simpler.
alien.destroy();
// ...
}
```
Wait, if I use `bullet.destroy()`, the group `maxSize` might be an issue. Actually, in Phaser 3, `group.get()` doesn't automatically manage the `maxSize` in a way that prevents you from destroying things, but it does limit how many it *creates*. If I destroy them, I might run out of "slots" if I'm not careful. But actually, `destroy()` removes it from the group.
Let's check the `shoot` function. It uses `bullets.get(player.x, player.y)`.
If I use `bullets.get`, it will create a new sprite if there are fewer than `maxSize` sprites in the group. If I `destroy()` them, the number of sprites in the group decreases. So `bullets.get` will just create more until it hits `maxSize`. This is actually fine.
One more check: `this.physics.moveToObject(alien, player, 50 + (wave * 10));` in `update`. This is called every frame for every alien. It's fine for a small number of aliens.
I'll make one small improvement to `hitAlien` to ensure the particle emitter is handled correctly. I used `particles.explode()` which is good.
Final check on `spawnWave`:
```javascript
function spawnWave(scene, waveNum) {
const count = 5 + (waveNum * 2);
let spawned = 0;
let attempts = 0;
while (spawned < count && attempts < 100) {
attempts++;
// Pick a random side of the screen
const side = Phaser.Math.Between(0, 3);
let x, y;
if (side === 0) { x = Phaser.Math.Between(0, 800); y = -32; } // Top
else if (side === 1) { x = Phaser.Math.Between(0, 800); y = 632; } // Bottom
else if (side === 2) { x = -32; y = Phaser.Math.Between(0, 600); } // Left
else { x = 832; y = Phaser.Math.Between(0, 600); } // Right
if (Phaser.Math.Distance.Between(x, y, player.x, player.y) > 200) {
const alien = aliens.create(x, y, 'alien');
alien.setBounce(1);
alien.setCollideWorldBounds(true);
spawned++;
}
}
}
```
This looks solid.
I'm ready to finish.
The top-down alien shooter has been built as a self-contained single-page application in `index.html`. It uses the provided `phaser.min.js` and features procedurally generated graphics, WASD movement, mouse aiming/shooting, wave-based difficulty, and a score/health system. To play the game, simply open `index.html` in any modern web browser. ```html <!-- index.html content summary --> <!-- - Procedural Graphics: Player (blue triangle), Aliens (green blobs), Bullets (yellow circles), Particles (orange squares) - Controls: WASD to move, Mouse to aim and shoot - Mechanics: Waves of increasing difficulty, score tracking, and health management --> ``` index.html present.
TAKE IT TO CODE
A single self-contained HTML file — copy it and open in any browser, or reuse the prompt with your own pi-agent run.
RUN
EVALUATION
Alien shooter with player triangle and smiley aliens, but health drops to 0 quickly triggering game over from nearly all inputs.
Vision grade · anthropic/claude-sonnet-5
MEASUREMENTS
Raw readings from the capture, not a verdict — the grade above is the only judgement. Percentages are how much of the screen changed; the measure under-reports sparse motion on a dark background.