Synthwave sunset · muse-spark-1.3
Output generated Cost / run $0.1173 Runtime 98.3s
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 · 21 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 15-second procedural synthwave canvas animation with grid, sun, starfield, reflection and pause/restart controls.Refining the seamless loop math with sinusoidal motion and modulo offsets for grid and sun.Extending the loop with star twinkle, sun glow and clipping, perspective grid motion, and distinct reflection shimmer.
Building your synthwave landscape — glowing sun, starfield, and traveling grid in one file.
index.html (13560 bytes)Successfully wrote to index.html
thinking
File saved — now verifying the loop, grid motion, and controls in the browser.
{"action":"inspect"}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SYNTHWAVE\nPause\nRestart\n16S SEAMLESS LOOP • PROCEDURAL CANVAS","images":"attached"}
thinking
Initial view looks great, but I spot a glitch in the right mountains — fixing that before the motion checks.
{"edits":[{"newText":" function ridge(side, seedArr, color, glowColor, heightMax){\n ctx.save();\n const x0 = side==='left' ? 0Successfully replaced 1 block(s) in index.html.
thinking
{"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":"SYNTHWAVE\nPause\nRestart\n16S SEAMLESS LOOP • PROCEDURAL CANVAS","images":"attached"}
thinking
{"action":"motion"}Frame 1, +0ms
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Frame 2, +1001ms
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Frame 3, +2024ms
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Frame 4, +3030ms
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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":"SYNTHWAVE\nPause\nRestart\n16S SEAMLESS LOOP • PROCEDURAL CANVAS","images":"attached"}
thinking
Motion looks good — grid rushing forward, sun descending. Now checking the playback controls.
{"action":"click","x":532,"y":37}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":"SYNTHWAVE\nResume\nRestart\n16S SEAMLESS LOOP • PROCEDURAL CANVAS","images":"attached"}
thinking
{"action":"motion"}Frame 1, +0ms
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Frame 2, +561ms
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Frame 3, +1105ms
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Frame 4, +1646ms
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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":"SYNTHWAVE\nResume\nRestart\n16S SEAMLESS LOOP • PROCEDURAL CANVAS","images":"attached"}
thinking
Pause freezes the frame perfectly — now testing resume and restart.
{"action":"click","x":536,"y":37}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SYNTHWAVE\nPause\nRestart\n16S SEAMLESS LOOP • PROCEDURAL CANVAS","images":"attached"}
thinking
{"action":"click","x":618,"y":38}Frame 1, +0ms
[Browser image supplied to model]
{"console":["warning: An iframe which has both allow-scripts and allow-same-origin for its sandbox attribute can escape its sandboxing."],"dom":"SYNTHWAVE\nPause\nRestart\n16S SEAMLESS LOOP • PROCEDURAL CANVAS","images":"attached"}
thinking
All checks passed — final summary: **Built `index.html`** — self-contained (inline CSS/JS, no network), full-viewport canvas with: - Gradient sun (yellow→orange→pink→purple) with glow and 6 growing scanline cuts - 220 twinkling procedural stars, mountain silhouettes with neon rims, horizon glow - Perspective grid: static converging verticals + 14 horizontal lines with `pow(f,2.8)` perspective rushing toward viewer via `(p%1)` modulo - Reflection: tapered light column + 22 shimmering streaks (gold/pink/cyan), clearly a streak-field not a second sun - 16s seamless loop: grid offset wraps by modulo, sun uses `0.5-0.5*cos(p*2π)` so it sinks toward horizon first half and rises second half with zero reset jump, stars twinkle with sine phases - Pause/Resume (freezes `run` time) + Restart (resets epoch) + progress bar, Space/R shortcuts **Verified in browser:** - Initial screenshot: full composition correct - 4-frame motion (~3s): grid horizontals move down/forward, sun descends slightly, reflection shimmers, progress bar advances - Pause click → button flips to Resume; 4-frame motion while paused → identical frozen frames - Resume click → animation continues; Restart click → progress bar resets to ~0 and sun returns to high start position matching initial composition - Fixed a mountain-ridge path bug found on first inspection **Unverified:** exact 16s wrap moment (would need 16s wait); no console errors seen (only sandbox warning).