Boids flocking · qwen3.7-plus
Create a full-screen flocking simulation of boids using separation, alignment, and cohesion, drawn as oriented triangles that steer smoothly and flee from the mouse cursor.
transcript · 4 messages
Create a full-screen flocking simulation of boids using separation, alignment, and cohesion, drawn as oriented triangles that steer smoothly and flee from the mouse cursor.
thinking
The user wants a full-screen boids flocking simulation with: 1. Separation, alignment, and cohesion behaviors 2. Oriented triangles (showing direction) 3. Smooth steering 4. Flee from mouse cursor 5. All in one self-contained index.html file 6. No external dependencies Let me build this with a canvas-based simulation. I'll need: - A boid class with position, velocity, acceleration - The three flocking rules (separation, alignment, cohesion) - Mouse avoidance - Smooth steering (limiting forces) - Oriented triangle rendering - Full-screen canvas with animation loop Let me write a comprehensive implementation.
/workspace/index.html (9909 bytes)Successfully wrote 9909 bytes to /workspace/index.html
thinking
The file has been created successfully. Let me summarize what I built.
Done. Here's what's in `index.html`: **Simulation features:** - **300 boids** rendered as oriented triangles that rotate to face their velocity direction - **Three classic flocking rules** — separation (avoid crowding), alignment (steer toward average heading), cohesion (steer toward center of mass) - **Spatial hash grid** for O(n) neighbor lookups instead of O(n²) - **Mouse flee behavior** — boids are repelled by the cursor with a force that scales by proximity, shown with a subtle red radial indicator - **Soft edge avoidance** — boids steer away from screen edges with a smooth falloff zone - **Smooth steering** — all forces are accumulated as acceleration and clamped against `MAX_FORCE` / `MAX_SPEED` for natural movement - **Visual polish** — HSL coloring shifts with speed and position, subtle glow edges, trail effect via semi-transparent background fade, chevron-shaped triangles (not just equilateral — they have a tail notch for better direction readability) - **Touch support** for mobile devices Everything runs fully self-contained with zero network requests.
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
Boids flock smoothly as oriented triangles, react to mouse with a visible red repulsion field, and animate continuously.
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.