Boids flocking · glm-5.3-flash
Output generated Cost / run $0.0016 Runtime 98.5s
Prompt for this run
Build a full-screen canvas flocking simulation with 150 boids drawn as oriented triangles. 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: - Combine separation, alignment, and cohesion so nearby boids avoid crowding, align their headings, and form moving groups. Triangles point in their direction of travel. - Use bounded speed and steering so motion changes smoothly instead of teleporting. Wrap boids across screen edges. - Boids within a visible or documented cursor-influence radius steer away from the pointer. They resume flocking after the pointer moves away. - Provide Pause/Resume and Reset. Pause freezes simulation state; Reset restores a fresh population of 150 boids. - Fit the canvas to the viewport and keep the population and controls usable after resizing. Verify: Sample the flock at several moments to check coordinated movement and triangles pointing along their travel direction. Try the cursor interaction with available pointer actions, then pause and resume to check that the flock freezes and continues.
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 · 19 messages
Build a full-screen canvas flocking simulation with 150 boids drawn as oriented triangles. 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: - Combine separation, alignment, and cohesion so nearby boids avoid crowding, align their headings, and form moving groups. Triangles point in their direction of travel. - Use bounded speed and steering so motion changes smoothly instead of teleporting. Wrap boids across screen edges. - Boids within a visible or documented cursor-influence radius steer away from the pointer. They resume flocking after the pointer moves away. - Provide Pause/Resume and Reset. Pause freezes simulation state; Reset restores a fresh population of 150 boids. - Fit the canvas to the viewport and keep the population and controls usable after resizing. Verify: Sample the flock at several moments to check coordinated movement and triangles pointing along their travel direction. Try the cursor interaction with available pointer actions, then pause and resume to check that the flock freezes and continues.
index.html (3800 bytes)Successfully wrote to index.html
{"action":"screenshot"}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":"Pause\nReset\nMove cursor into the flock — boids within 120px steer away","images":"attached"}
thinking
Initial spread is fine (random). Let flock cohere over time — check later frames. Also test pointer interaction and pause.
Initial state renders correctly. Let me check coordinated movement after a few seconds, and the pointer interaction.
{"action":"motion"}Frame 1, +0ms
[Browser image supplied to model]
Frame 2, +582ms
[Browser image supplied to model]
Frame 3, +1179ms
[Browser image supplied to model]
Frame 4, +1743ms
[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":"Pause\nReset\nMove cursor into the flock — boids within 120px steer away","images":"attached"}
thinking
Flocks form nicely, triangles point along travel. Now test cursor avoidance, pause/resume.
Flocking works well — coordinated groups with triangles aligned to travel direction. Now testing cursor avoidance, then pause/resume.
{"action":"drag","toX":250,"toY":150}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":"Pause\nReset\nMove cursor into the flock — boids within 120px steer away","images":"attached"}
thinking
Cursor influence circle visible, flock cleared out of it. Now pause → screenshot → resume → screenshot.
Cursor avoidance works — the flock clears the 120px radius circle. Now testing pause/resume.
{"action":"click","x":47,"y":25}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":"Resume\nReset\nMove cursor into the flock — boids within 120px steer away","images":"attached"}
{"action":"screenshot"}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":"Resume\nReset\nMove cursor into the flock — boids within 120px steer away","images":"attached"}
thinking
Flock is frozen — identical position across frames. Resume and verify motion, then reset.
Frozen frame confirmed (identical across screenshots). Now resume and check motion restarts.
{"action":"click","x":47,"y":25}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":"Pause\nReset\nMove cursor into the flock — boids within 120px steer away","images":"attached"}
thinking
Motion resumed (boids shifted, buttons show Pause again). Reset check: click Reset and confirm re-scattered population.
Resume works — flock continues moving and button flipped back to "Pause". Final check: Reset.
{"action":"click","x":134,"y":25}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":"Pause\nReset\nMove cursor into the flock — boids within 120px steer away","images":"attached"}
All verified. `index.html` is complete. **What I checked in the browser:** - **Flocking** — motion frames over ~2s show 150 boids coalescing into several coherent groups whose triangles all point along shared travel direction (separation keeps spacing, alignment/cohesion form groups). - **Cursor avoidance** — dragging the pointer into the flock showed the 120px influence circle and the flock evacuating it; boids regroup and resume flocking after the pointer moves on. - **Pause/Resume** — pausing produced identical frames (state fully frozen); resuming restarted smooth motion from the frozen positions. - **Reset** — population re-scattered randomly across the viewport as a fresh 150-boid start. **Implementation notes:** bounded speed (60–170 px/s) with capped steering force gives smooth turns; edge wrapping; canvas sized to viewport via `resize` handler; controls fixed top-left with a hint documenting the cursor radius. Unverified: long-run stability over many minutes and behavior under window resize (code handles it, but not exercised).