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Easing curves, sequences, yoyo/loop.\n\nPart of the [zio-zig](https://github.com/deblasis/zio-zig) ecosystem.\n\n## Quick start\n\n```zig\nconst ztween = @import(\"ziotween\");\nconst ease = ztween.ease;\n\n// Create a tween: value goes from 0 to 100 over 1 second\nvar t = ztween.Tween(f32).init(0, 100, 1_000_000_000, ease.linear);\nt.start();\n\n// Update each frame\nconst value = t.update(16_000_000); // 16ms frame\n// value ≈ 1.6\n\n// Check state\nif (t.done()) { /* tween finished */ }\nconst progress = t.progress(); // 0.0 to 1.0\n\n// Create a sequence of tweens\nvar tweens = [_]ztween.Tween(f32){\n    ztween.Tween(f32).init(0, 50, 500_000_000, ease.cubicOut),\n    ztween.Tween(f32).init(50, 100, 500_000_000, ease.bounceOut),\n};\nvar seq = ztween.Sequence(f32).init(\u0026tweens);\nseq.start();\n```\n\n```bash\nzig build test          # Run 40 tests\nzig build run-example   # Run example\n```\n\n## Example output\n\n```\n$ zig build run-example\nAfter 16ms: 1.6\nProgress: 0.02\nDone: false\nAfter 1s: 100.0\nDone: true\nSequence done: false\n```\n\n## API\n\n### Tween(T)\n\nAnimates a value from `from` to `to` over `duration_ns` with an easing function.\n\n| Method | Description |\n|--------|-------------|\n| `init(from, to, duration_ns, easing)` | Create tween |\n| `start()` | Start/restart the tween |\n| `update(dt_ns)` | Advance time, returns current value |\n| `value()` | Current interpolated value |\n| `progress()` | Progress 0.0 to 1.0 |\n| `done()` | Whether tween is complete |\n\n### Sequence(T)\n\nPlays multiple tweens in order.\n\n| Method | Description |\n|--------|-------------|\n| `init(tweens)` | Create from tween array |\n| `start()` | Start/restart sequence |\n| `update(dt_ns)` | Advance, returns current value |\n| `done()` | Whether all tweens complete |\n\n### Easing functions\n\nUse any function with signature `fn(comptime T, T) T`. See [zioease](https://github.com/deblasis/zioease) for 30+ built-in easing functions.\n\n## License\n\nMIT. Copyright (c) 2026 Alessandro De Blasis.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdeblasis%2Fziotween","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fdeblasis%2Fziotween","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fdeblasis%2Fziotween/lists"}