Mandelbrot explorer · deepseek-v4-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 · 4 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. Full-screen canvas 2. Smooth color gradient 3. Click-and-drag to pan 4. Mouse-wheel to zoom Let me create a self-contained index.html file.
/workspace/index.html (9195 bytes)Successfully wrote 9195 bytes to /workspace/index.html
thinking
Let me verify the file was created and looks correct.
The file is ready. Here's a summary of what `/workspace/index.html` does: **Mandelbrot Set — Single-Page App** - **Full-screen canvas** with device pixel ratio support for crisp rendering on retina displays. - **Smooth color gradient** — a 2048-entry HSL palette built at startup that cycles through blues, magentas, and reds with smoothly varying saturation and lightness. - **Smooth iteration counting** — uses the normalized iteration count algorithm (`iter + 1 - log(log(|z|)) / log(2)`) to eliminate color banding. - **Click-drag to pan** — drag the mouse (or single-finger drag on touch) to move around. - **Mouse-wheel to zoom** — zooms toward the cursor position (or pinch-zoom on touch with two fingers). - **Adaptive max iterations** — `maxIter` automatically increases as you zoom in (from 100 up to 2000), keeping deep zooms detailed. - **Progressive rendering** — renders in row chunks and uses an abort flag, so panning/zooming during an ongoing render cancels and restarts immediately, keeping the UI responsive. - **Touch support** — single-finger drag to pan, two-finger pinch to zoom.
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 set with smooth gradient renders correctly; drag pans and wheel zooms as expected, click/keys do nothing (correct).
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.