Mandelbrot explorer · deepseek-v4-flash-0731
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
Let me build a Mandelbrot set renderer in a single index.html file. Let me write it with smooth coloring, pan/zoom controls. Let me create the file.
/workspace/index.html (8277 bytes)Successfully wrote 8277 bytes to /workspace/index.html
thinking
Let me verify the file works by checking it exists.
{"command":"ls -la /workspace/index.html && node -e \"console.log('file ok')\""}-rw-r--r-- 1 node node 8277 Aug 1 05:17 /workspace/index.html file ok
The app is complete in `/workspace/index.html` — a single self-contained file with no external dependencies. **What it does:** - **Full-screen canvas** rendering the Mandelbrot set, with crisp output via devicePixelRatio scaling. - **Smooth color gradient** — smooth (continuous) iteration count with a normalized interpolation into a 5-stop blue→cyan→cream palette. Interior points render black. - **Click-and-drag to pan** — pointer events track the drag and shift the complex-plane center opposite the cursor. - **Mouse-wheel to zoom** — zoom keeps the complex coordinate under the cursor fixed, with clamping between sane bounds. - **Bonus:** pinch-to-zoom and single-finger pan for touch devices. - **Efficient rendering** — a per-row precomputed real-coordinate array, early magnitude-squared bailout, and rAF-coalesced redraws so interaction stays smooth. Rendering runs purely on the CPU (no network, no GPU shaders), so it works fully sandboxed. Open the file in any browser to use it.
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 drag-pan and wheel-zoom working; click/keyboard cause no change as expected since not part of prompt.
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.