# Ticker Text Design

## Problem

The `BounceMarqueeText` composable in `NowPlayingScreen.kt` scrolls long text at a speed proportional to overflow, clamped to 2000–8000ms. For very long titles, the 8000ms cap means the text covers more distance in the same time — making it visibly faster and harder to read. The bounce-back pattern (scroll left, pause, scroll right) also feels unnatural compared to a continuous ticker.

## Decision

Replace `BounceMarqueeText` with a `TickerText` composable that scrolls at a constant 33 dp/s leftward, regardless of text length.

## Design

### `TickerText` composable

**Parameters:**
- `text`, `style`, `color`, `strokeColor`, `strokeWidth`, `modifier` — same as current `BounceMarqueeText`
- `velocityDpPerSecond: Float = 33f` — constant scroll speed

**Behavior:**
- Text fits in container: rendered centered and static (no animation).
- Text overflows: scrolls continuously leftward at 33 dp/s.
- After the text exits the left edge, a gap equal to the container width passes (screen appears empty), then the text reappears from the start position and repeats.

**Animation math:**
- `totalScrollPx = textWidthPx + containerWidthPx`
- `durationMs = (totalScrollPx / (velocityDpPerSecond * density)) * 1000`
- No upper clamp — longer text simply takes longer at the same speed.
- Keyframes: `0f` → `-(textWidthPx)` with `LinearEasing`, then restart.
- Initial delay of ~1.5s before first scroll so user can read the beginning.

**Stroke overlay:** Both the stroke `Text` and fill `Text` remain in the same translated `Box`, moving together.

**Callers:** `TrackInfoSection` swaps `BounceMarqueeText` → `TickerText` with no other changes.

## Rejected alternatives

- **`Modifier.basicMarquee()`** — less control over gap/looping, uncertain Compose BOM version support, harder to keep the stroke overlay working.
- **Custom `Canvas` + `drawText`** — maximum control but overkill; significantly more code for the same result.