Mandelbrot explorer · qwen3.7-flash
Render the Mandelbrot set with a smooth color gradient on a full-screen canvas, with click-and-drag to pan and mouse-wheel to zoom.
transcript · 6 messages
Render the Mandelbrot set with a smooth color gradient on a full-screen canvas, with click-and-drag to pan and mouse-wheel to zoom.
thinking
The user wants a single-page web app that renders the Mandelbrot set with: 1. Smooth color gradient 2. Full-screen canvas 3. Click-and-drag to pan 4. Mouse-wheel to zoom I'll create a self-contained index.html with all CSS and JS inline, no external resources. I need to implement the Mandelbrot set rendering using canvas 2D context, with smooth coloring (normalized iteration count), panning via mouse drag, and zooming via wheel. Let me write this efficiently with a good implementation including: - Canvas filling the viewport - Mandelbrot computation with escape time algorithm - Smooth coloring using continuous/normalized iteration count - Beautiful color palette (using HSL or cosine palette) - Pan interaction (mousedown/mousemove/mouseup) - Zoom interaction (wheel event) - Responsive resize handling
/tmp/ws/index.html (7703 bytes)Successfully wrote 7703 bytes to /tmp/ws/index.html
thinking
The file has been written successfully. Let me verify it exists and is complete.
{"command":"wc -l /tmp/ws/index.html && head -3 /tmp/ws/index.html && echo \"---\" && tail -3 /tmp/ws/index.html"}267 /tmp/ws/index.html <!DOCTYPE html> <html lang="en"> <head> --- </script> </body> </html>
thinking
File is present and complete. Let me summarize what was built.
Done — `index.html` is ready (267 lines, fully self-contained, no external resources). Features: - **Mandelbrot set** rendered on a full-screen canvas with device pixel ratio support for crisp rendering on HiDPI displays - **Smooth coloring** using normalized iteration count + cosine palette (vibrant, continuous gradient) - **Click-and-drag to pan** across the fractal - **Mouse-wheel to zoom**, zooming towards cursor position - **Double-click** to reset view back to the default framing - **Touch support**: single-finger drag to pan, two-finger pinch to zoom - **Live HUD** showing zoom level and center coordinates in high precision - Renders via `setTimeout` chunking so the UI stays responsive during computation
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
Mandelbrot renders with pink/red gradient; drag pans view and wheel zooms slightly, but click and keyboard inputs do nothing.
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.