Bouncing balls in a heptagon · qwen3.6-flash
Show 20 numbered balls (1 to 20) dropping from the center of a heptagon that spins 360 degrees every 5 seconds. The balls are affected by gravity and friction, collide with each other, and bounce realistically off the rotating walls; show each ball's spin via the rotation of its number. Implement all collision detection yourself.
transcript · 4 messages
Show 20 numbered balls (1 to 20) dropping from the center of a heptagon that spins 360 degrees every 5 seconds. The balls are affected by gravity and friction, collide with each other, and bounce realistically off the rotating walls; show each ball's spin via the rotation of its number. Implement all collision detection yourself.
thinking
The user wants a single-page HTML file with a physics simulation featuring: 1. A heptagon (7-sided polygon) that spins 360° every 5 seconds 2. 20 numbered balls (1-20) dropping from the center 3. Gravity and friction effects 4. Ball-to-ball collisions 5. Ball-to-wall collisions with the rotating heptagon 6. Ball spin visualization (numbers rotate on balls) 7. All physics implemented from scratch Let me build this with a canvas-based simulation. I need to implement: - Rotating heptagon geometry - Gravity physics - Friction/damping - Circle-circle collision detection and response - Circle-line segment collision detection and response (for rotating walls) - Ball spin (angular velocity affecting visual rotation of numbers) Let me write this carefully.
/workspace/index.html (13129 bytes)Successfully wrote 13129 bytes to /workspace/index.html
thinking
The user asked me to build a single-page web app with numbered balls (1-20) that drop from the center of a spinning heptagon, with gravity, friction, ball-ball collisions, wall collisions, and ball spin visualization via number rotation. Let me review what I built to make sure it's complete: 1. ✅ 20 numbered balls (1-20) 2. ✅ Dropping from center of a heptagon 3. ✅ Heptagon spins 360° every 5 seconds 4. ✅ Gravity 5. ✅ Friction (air friction + spin friction) 6. ✅ Ball-ball collisions with proper collision response 7. ✅ Ball-wall collisions with bouncing off rotating walls 8. ✅ Ball spin visualization (number rotation) 9. ✅ Self-implemented collision detection 10. ✅ Single index.html file, no external resources 11. ✅ Self-contained, sandboxed The code looks complete and correct. Let me verify the file exists.
✅ `index.html` created — a fully self-contained physics simulation with zero external dependencies. Here's what it includes: **Visuals** - 20 colorful numbered balls (1–20) with gradient shading and white crosshair lines so spin is clearly visible on the rotating numbers - A glowing, color-shifting heptagon that rotates 360° every 5 seconds - Background with subtle grid and radial gradient (all rendered on canvas) **Physics (all implemented from scratch)** - **Gravity** pulling balls downward at 980 px/s² - **Air friction** damping linear velocity over time - **Ball–ball collisions**: elastic impulse response with proper normal-based collision detection, overlap separation, and tangential spin transfer - **Ball–wall collisions**: closest-point-on-segment detection, reflection with configurable restitution, tangential friction from the wall's surface velocity (which accounts for the heptagon's rotation), and angular momentum transfer to ball spin - **Containment correction**: ray-casting point-in-heptagon test pushes any ball that escaped back inside - **Sub-stepping**: 4 physics sub-steps per frame for stability
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
Numbered balls drop into a spinning heptagon with physics, collisions, and rotation, animating continuously but unaffected by 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.