Synthwave sunset · muse-wonder
Output generated Cost / run $0.4715 Runtime 147.3s
Prompt for this run
Build an animated synthwave landscape on a full-screen canvas. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. No third-party libraries are provided. Required behavior: - Draw a glowing gradient sun broken by horizontal scanline bands, a starfield, and a perspective neon grid extending from the foreground to a horizon. - Animate the grid toward the viewer to suggest forward travel. Move the sun slowly down toward the horizon while keeping the composition visible. - Below the horizon, include a stylized reflection of the sun's colors on the ground plane, visually distinct from a second sun in the sky. - Use a loop of 10 to 20 seconds that repeats without a distracting reset jump. Provide Pause/Resume and Restart controls. - Use procedural drawing and colors only. Fit the canvas to the viewport; choose the palette and decorative details freely. Verify: Sample several moments to inspect grid travel, sun movement, and the reflected colors below the horizon. Pause and resume to check animation control, then use Restart and compare the starting composition.
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
METRICS
Transcript · 27 messages
Build an animated synthwave landscape on a full-screen canvas. Use HTML, CSS, and JavaScript as needed. Write it to `index.html` in the current working directory using your file tools. Inline your own CSS and JavaScript. Do not use external assets, CDNs, or network requests. No third-party libraries are provided. Required behavior: - Draw a glowing gradient sun broken by horizontal scanline bands, a starfield, and a perspective neon grid extending from the foreground to a horizon. - Animate the grid toward the viewer to suggest forward travel. Move the sun slowly down toward the horizon while keeping the composition visible. - Below the horizon, include a stylized reflection of the sun's colors on the ground plane, visually distinct from a second sun in the sky. - Use a loop of 10 to 20 seconds that repeats without a distracting reset jump. Provide Pause/Resume and Restart controls. - Use procedural drawing and colors only. Fit the canvas to the viewport; choose the palette and decorative details freely. Verify: Sample several moments to inspect grid travel, sun movement, and the reflected colors below the horizon. Pause and resume to check animation control, then use Restart and compare the starting composition.
thinking
Designing a single-file full-screen canvas synthwave animation with seamless 16s loop, grid offset, and sun reflection.Resolving the sun descent reset by smoothing the loop transition to avoid a visible jump.Switching to a cosine-based ping-pong motion for a seamless sun loop without a visible reset jump.
index.html (18814 bytes)Successfully wrote to index.html
thinking
{"action":"inspect"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"NEON HORIZON\n\nMIDNIGHT DRIVE • 1986\n\n❚❚ PAUSE\n↺ RESTART\nPLAYING · 0.8 / 16.0S\nSpace = Pause / Resume","images":"attached"}
thinking
Analyzing canvas clip path logic for the sun and adjusting reflection shape to be more streaky.
{"path":"index.html","edits":[{"oldText":" ctx.save();\n ctx.beginPath(); ctx.arc(sunX, sunY, sunR, 0, TAU); ctx.rect(0, 0, W, horizonSuccessfully replaced 2 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"NEON HORIZON\n\nMIDNIGHT DRIVE • 1986\n\n❚❚ PAUSE\n↺ RESTART\nPLAYING · 1.0 / 16.0S\nSpace = Pause / Resume","images":"attached"}
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{"path":"index.html","edits":[{"oldText":" ctx.globalAlpha = 0.30;","newText":" ctx.globalAlpha = 0.52;"},{"oldText":" const alphSuccessfully replaced 3 block(s) in index.html.
{"action":"motion"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"NEON HORIZON\n\nMIDNIGHT DRIVE • 1986\n\n❚❚ PAUSE\n↺ RESTART\nPLAYING · 0.5 / 16.0S\nSpace = Pause / Resume","images":"attached"}
thinking
Analyzing motion frames to verify sun descent timing and reflection visibility issues with alpha blending and gradient.Adjusting reflection layering and alpha to make it visible over the grid while preserving the ground gradient.
{"path":"index.html","edits":[{"oldText":" // Horizon glow line","newText":" // Reflection sheen over the grid: broken, rippling streaSuccessfully replaced 1 block(s) in index.html.
{"action":"reload"}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"NEON HORIZON\n\nMIDNIGHT DRIVE • 1986\n\n❚❚ PAUSE\n↺ RESTART\nPLAYING · 0.8 / 16.0S\nSpace = Pause / Resume","images":"attached"}
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{"action":"click","x":380,"y":736}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"NEON HORIZON\n\nMIDNIGHT DRIVE • 1986\n\n▶ RESUME\n↺ RESTART\nPAUSED · 3.8 / 16.0S\nSpace = Pause / Resume","images":"attached"}
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{"action":"click","x":380,"y":736}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"NEON HORIZON\n\nMIDNIGHT DRIVE • 1986\n\n❚❚ PAUSE\n↺ RESTART\nPLAYING · 4.2 / 16.0S\nSpace = Pause / Resume","images":"attached"}
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{"action":"click","x":510,"y":736}Frame 1, +0ms
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{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"NEON HORIZON\n\nMIDNIGHT DRIVE • 1986\n\n❚❚ PAUSE\n↺ RESTART\nPLAYING · 0.9 / 16.0S\nSpace = Pause / Resume","images":"attached"}
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{"command":"ls -lh index.html && grep -iE \"http://|https://|cdn|url\\(|@import|<link|<img\" index.html || echo \"no external references fou-rw-r--r-- 1 node node 20K Oct 15 04:12 index.html no external references found
thinking
Built and saved the animated synthwave landscape to `index.html` (single self-contained file, no external assets). **What it includes:** - Full-screen canvas with a glowing yellow→orange→pink→purple gradient sun, broken by widening horizontal scanline bands that show the sky through them - Twinkling procedural starfield (seeded, so restarts match exactly), nebula washes, a periodic shooting star, and mountain silhouettes on the horizon - Perspective neon grid (cyan/pink) whose horizontal lines rush toward the viewer and wrap by exactly one row, so travel is seamless - Sun slowly sinking toward the horizon via a smooth cosine descent (zero velocity at loop ends, no jump) over a **16-second loop** - A distinct sun reflection below the horizon: a tapered, rippling column of dashed orange/pink/purple streaks with a sheen pass over the grid — no second disc - **Pause/Resume** and **Restart** controls with a live time/progress readout (Space also toggles pause) **Verified in the browser:** - Initial render, plus a motion capture showing grid lines advancing toward the viewer - Sun visibly lower at ~3.8s than at ~0.5s, and the loop wrapping from ~15.2s back to ~0.3s without a jump - Reflected sun colours clearly visible below the horizon after strengthening the sheen (checked in screenshots) - Pause froze the clock at 3.8s ("Paused"), Resume continued from 4.0s rather than resetting, and Restart returned the timer to ~0.6s with the original starting composition (sun back at the top) **Not verified:** behaviour at mobile/small viewport sizes and window-resize mid-animation (resize handling is implemented but wasn't exercised), and keyboard Space toggling was not tested via synthetic key events.