Asteroids · glm-5.3-flash
Output generated Cost / run $0.0049 Runtime 249.8s
Prompt for this run
Build a playable Asteroids-style game on a canvas using procedural vector graphics. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. No third-party libraries are provided. Required behavior: - Use Left/Right to rotate the ship, Up to thrust, and Space to fire. Show the controls. The ship retains momentum and wraps around every screen edge; asteroids also wrap. - Spawn moving large asteroids. A bullet hit splits a large asteroid into smaller pieces; hitting a smallest piece removes it. Hits increase the score. - Start with three lives. A ship-asteroid collision removes one life, respawns the ship, and briefly protects it from immediate repeated damage. - Clearing all asteroids starts another wave. Losing all lives shows Game Over and a Restart control that resets score, lives, and the arena. - Keep projectile lifetime bounded and prevent gameplay keys from scrolling the page. Verify: Test rotation, thrust, and firing near the initial spawn. Check that the ship changes heading, gains momentum, and emits moving projectiles. Sample the scene to inspect screen wrapping when an object crosses an edge.
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
METRICS
Transcript · 49 messages
Build a playable Asteroids-style game on a canvas using procedural vector graphics. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. No third-party libraries are provided. Required behavior: - Use Left/Right to rotate the ship, Up to thrust, and Space to fire. Show the controls. The ship retains momentum and wraps around every screen edge; asteroids also wrap. - Spawn moving large asteroids. A bullet hit splits a large asteroid into smaller pieces; hitting a smallest piece removes it. Hits increase the score. - Start with three lives. A ship-asteroid collision removes one life, respawns the ship, and briefly protects it from immediate repeated damage. - Clearing all asteroids starts another wave. Losing all lives shows Game Over and a Restart control that resets score, lives, and the arena. - Keep projectile lifetime bounded and prevent gameplay keys from scrolling the page. Verify: Test rotation, thrust, and firing near the initial spawn. Check that the ship changes heading, gains momentum, and emits moving projectiles. Sample the scene to inspect screen wrapping when an object crosses an edge.
index.html (5975 bytes)Successfully wrote to index.html
{"action":"reload"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
thinking
Test rotation/thrust/fire. Hold ArrowLeft then screenshot.
The game renders correctly. Now testing rotation, thrust, and firing:
{"action":"key","text":"ArrowLeft"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
thinking
The key event fired once (browser tool key is a tap); can't hold. Rotation effect unclear since tap only held briefly. I'll verify logic directly in the page via inspecting console — but browser tool only does inspect/screenshot. Alternative: use browser "type"? Actually I could dispatch multiple keys. Instead, verify via a quick JS check: I can't eval JS with the browser tool. But I can test in node by extracting logic? Simpler: temporarily add a debug hook? The tool has key with text — maybe passing "ArrowLeft" holds? It seems it was a tap and the ship rotated a bit (hard to tell, only ~4 frames of 0.07 rad). Ship looks same angle. I could add keyboard-hold simulation by sending multiple key events. Let me send several ArrowLeft keys, then thrust with ArrowUp a few times, screenshot, check flame and heading; then Space, screenshot to check bullet.
The key tool sends taps; let me send several rotation taps, then thrust and fire to verify heading change, momentum, and projectiles.
{"action":"key","text":"ArrowLeft ArrowLeft ArrowLeft ArrowLeft ArrowLeft ArrowLeft ArrowLeft ArrowLeft ArrowLeft ArrowLeft"}keyboard.press: Unknown key: "ArrowLeft ArrowLeft ArrowLeft ArrowLeft ArrowLeft ArrowLeft ArrowLeft ArrowLeft ArrowLeft ArrowLeft"
{"action":"key","text":"ArrowLeft"}{"action":"key","text":"ArrowLeft"}{"action":"key","text":"ArrowLeft"}{"action":"key","text":"ArrowLeft"}{"action":"key","text":"ArrowLeft"}{"action":"key","text":"ArrowLeft"}{"action":"key","text":"ArrowUp"}{"action":"key","text":"Space"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
thinking
Interesting — between my earlier single ArrowLeft test and these keys, the ship died from asteroid collisions (an asteroid drifted into it), lives went to 0, game over — good, collision/lives/game over/restart all work. Restart worked (last frame shows fresh game with lives 3). But note: at game over, pressing Space to restart... last frame shows game restarted, good. However a problem: on game over, the Space key restarts — but I want to also verify rotation/momentum. The screenshots between keys happen at single frames; taps are too brief. The collision showing one life lost earlier... but the ship never respawned visibly? At game over after Space it did restart. Note bug risk: Space triggers restart immediately after game over and also fires — acceptable. For verifying rotation/thrust/momentum/bullet, the key taps are too brief to see. I can add a temporary debug: window test hook that simulates key holds. Actually I can verify via the "type" action? Let me instead add a small debug query param, e.g. if location.hash contains "test", run a scripted sequence. Simpler: use browser inspect to read game state? Inspect gives DOM, not JS vars. Alternative: hold keys via keyboard event simulation in page: add a test mode where pressing "T" runs a demo. Let me just add a hidden test harness: if `#test` in hash, after 500ms do: keys.ArrowRight=true for 60 frames, thrust 40 frames, fire. Then screenshot with motion to see bullet trail and rotated ship. I'll add a small block guarded by hash check.
Collision → lives loss → Game Over → restart all verified incidentally. Now I need to verify rotation, thrust momentum, and projectiles. Since the key tool only taps, I'll add a small hash-gated test script that simulates key holds.
{"edits":[{"newText":"function loop(){update();draw();requestAnimationFrame(loop);}\nreset();\nloop();\n\n// test harness: #test runs a scriSuccessfully replaced 1 block(s) in index.html.
{"command":"echo ok"}{"action":"reload"}ok
Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
thinking
The reload didn't have #test hash. I need to navigate with hash. The browser tool reload only reloads index.html without hash control? Maybe I can append hash by... no URL control. Instead trigger test via key: change harness to run when pressing "T". Then press T.
Reload didn't include the hash. Let me trigger the test with a key press instead.
{"edits":[{"newText":" window.__startTest=()=>{","oldText":"if(location.hash.includes('test')){\n let f=0, log=[];"},{"newText":" if(f=Successfully replaced 2 block(s) in index.html.
{"command":"sed -n '/test harness/,/KeyT/p' index.html"}// test harness: #test runs a scripted input sequence window.__startTest=()=>{ setInterval(()=>{ f++; if(f<40) keys.ArrowRight=true; else keys.ArrowRight=false; if(f>=40&&f<80) keys.ArrowUp=true; else keys.ArrowUp=false; if(f===45||f===55||f===65||f===75) fire(); if(f%20===0) log.push('f'+f,'ang:'+ship.angle.toFixed(2),'pos:'+ship.x.toFixed(0)+','+ship.y.toFixed(0),'vel:'+ship.vx.toFixed(2)+','+ship.vy.toFixed(2),'bullets:'+bullets.length); if(f===82){window.__TESTLOG=log.join(' | ');keys={};} },16);}; window.addEventListener('keydown',e=>{if(e.code==='KeyT')window.__startTest();});
thinking
Missing let f=0, log=[] and invuln may cause collision. Add declarations. Also disable collisions during test? Ship may die. Set invuln high.
{"edits":[{"newText":" window.__startTest=()=>{\n let f=0, log=[]; invuln=1e9;","oldText":" window.__startTest=()=>{\n setInterval((){"}Could not find the exact text in index.html. The old text must match exactly including all whitespace and newlines.
{"edits":[{"newText":" window.__startTest=()=>{\n let f=0, log=[]; invuln=1e9;\n setInterval(()=>{","oldText":" window.__startTest=()=>{Successfully replaced 1 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
{"action":"key","text":"t"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
thinking
The test ran (ship rotated right, ghosting from invulnerability blink). Now read the log. The inspect action might show console only; window.__TESTLOG isn't console. I could log to console at end. Quick edit: console.log.
Test ran (ship visibly rotated). Let me log results to console.
{"edits":[{"newText":"if(f===82){window.__TESTLOG=log.join(' | ');console.log('TESTLOG:',window.__TESTLOG);keys={};}","oldText":"if(f===82){Successfully replaced 1 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
{"action":"key","text":"t"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
{"action":"inspect"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing.","log: TESTLOG: f20 | ang:-0.31 | pos:400,300 | vel:0.00,0.00 | bullets:0 | f40 | ang:1.09 | pos:400,300 | vel:0.00,0.00 | bullets:0 | f60 | ang:1.09 | pos:413,324 | vel:1.26,2.40 | bullets:1 | f80 | ang:1.09 | pos:448,392 | vel:2.40,4.59 | bullets:2","error: Assignment to constant variable."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
thinking
Test verified: rotation (ang -1.57→1.09), thrust momentum (vel grows, position moves), bullets spawn (2 remaining after firing 4, lifetime removes others). Also two asteroids crossed the left edge showing wrap (one ghost at edge). But there's an error: "Assignment to constant variable" — keys={} assigned to a const! `const keys = {}` reassigned in test harness at f===82 and in the game over Space? No, only test. That error occurred after f=82, killing the test interval only — but it may also have broken something else? It was thrown inside setInterval, so game loop unaffected. Still, fix: change keys={}} to clear properties.
Fix that, then also verify bullet lifetime bounded (LASER_LIFE=40 frames — good), wrap for bullets and asteroids done, remove test harness? Keeping KeyT harness is harmless but let's fix the error and remove the harness for cleanliness. Also verify game over restart worked earlier — yes.
Remove harness entirely.All core mechanics verified: angle changed from -1.57 to 1.09 (rotation), velocity grew and position moved (momentum), bullets spawned with bounded lifetime. One test-harness error ("Assignment to constant variable") was in my debug code only. Let me remove the harness to finalize.
{"edits":[{"newText":"function loop(){update();draw();requestAnimationFrame(loop);}\nreset();\nloop();","oldText":"function loop(){update();Successfully replaced 1 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"Left/Right: rotate | Up: thrust | Space: fire","images":"attached"}
thinking
Clean, no console errors. Done. Report.
Final version is clean — no console errors. `index.html` is complete. **What I built** (`/tmp/job-wGhzxw/index.html`, fully self-contained): - Procedural vector ship (polygon outline) and jagged procedural asteroids; thrust flame rendered when accelerating. - Controls shown below the canvas: Left/Right rotate, Up thrust, Space fire; those keys are `preventDefault`-ed so the page never scrolls. - Momentum + friction, screen wrap for ship, bullets, and asteroids. - Waves start with 4 large asteroids; hits split into two smaller pieces (score 20/50/100 by size); smallest pieces just vanish. Bullets last 40 frames and have a firing cooldown. - 3 lives; ship–asteroid collision costs a life, respawns the ship at center with a blinking invulnerability window (~2.5 s). Clearing all asteroids advances the wave (more asteroids). Game Over screen shows score, "Press Enter or Space to Restart" plus a clickable RESTART button that resets score/lives/arena. **What I verified in the browser:** - Initial render: ship centered, HUD (Score 0 / Lives 3 / Wave 1), asteroids spawned away from spawn point. - Instrumented input run: heading changed from −1.57 → 1.09 rad under right-rotation; velocity grew to (2.4, 4.6) and position advanced under thrust (momentum confirmed); 4 shots fired produced live projectiles that decay with bounded lifetime. - Screen wrap observed as asteroids crossed edges (ghost shapes at boundaries, re-entering the opposite side). - Collision path: lives decrement, Game Over appears, and Space/Enter restart resets to Score 0 / Lives 3 / Wave 1 with a fresh arena. **Not directly verified:** bullet-asteroid hit/split scoring visually (collision code is exercised by the same distance check used for ship hits), the restart click-button (keyboard restart tested instead), and extended multi-wave progression.