---
title: "Reactive psychedelic backgrounds: API"
package: "@phaser-ae/backdrop-trippatron"
tier: Pro
version: 3.0.0-3
released: 2026-10-14
updated: 2026-10-19
description: "Twenty full-screen neon backgrounds for psychedelic arcade arenas that bulge with explosions, pulse to the music and ripple behind a dragged finger."
url: https://phaser.io/packs/backdrop-trippatron/api
site: Phaser - https://phaser.io
---

# Reactive psychedelic backgrounds: API

`@phaser-ae/backdrop-trippatron` — Twenty full-screen reactive arcade backgrounds (neon grids, hexes, circuits, stars, aurora, tunnels, kaleidoscopes) that ripple with impacts and music.

## The pack

### `backdropTrippatron`

```ts
function backdropTrippatron(): Pack<{ tripBackdrop: TripBackdropApi }>
```

Install twenty impact-reactive geometric, organic and space-themed raster surfaces as `game.tripBackdrop`. Requires
`trippatron` composed first (its impact ring and audio state). Draws its own opaque `trippatron.backdrop` pass after
`backdrops` and before `sprites`.

## Helpers

### `tripBackdropStyles`

```ts
const tripBackdropStyles: readonly TripBackdropStyle[]
```

Available procedural surfaces, in stable shader order.

## Types

### `TripBackdropApi`

```ts
interface TripBackdropApi
```

The pack's single bounded procedural background layer.

- `show(config?: TripBackdropConfig): TripBackdropHandle` — Replace the background from one object (validated before anything is replaced). Scene-scoped: leaving the scene removes it.
- `clear(): void` — Remove the background.

### `TripBackdropConfig`

```ts
interface TripBackdropConfig
```

Live background settings. Distances are world units and hue is measured in turns. Non-finite numbers throw; the
ranges below are clamped. The docs page says what `spacing` and `lineWidth` mean for each style.

- `style?: TripBackdropStyle` — The surface, one of {@link tripBackdropStyles}. Default 'grid'.
- `spacing?: number` — The pattern's scale, 2..1000: cell size for the lattices, ring or line pitch, star sector size. Default 36.
- `lineWidth?: number` — Line half-width, 0.1..30, for the line styles; star size for 'starfield'; plasma, checker, aurora and nebula ignore it. Default 1.2.
- `warp?: number` — Ambient wobble of the whole surface, 0..500. Default 8.
- `speed?: number` — Animation speed, -20..20; negative runs backwards. Default 1.
- `hue?: number` — Base hue, turns. Default 0.55.
- `cycle?: number` — Hue cycles per second, -10..10. Default 0.07.
- `brightness?: number` — Light intensity, 0..3. Default 0.55.
- `rounding?: number` — Rounded bulge of the lattice cells, 0..1. Default 0.
- `audioGain?: number` — Response to `trip.audio` / `trip.listen` amplitude (wobble, brightness, hue), 0..10. Default 1.
- `waveform?: boolean` — Draw the supplied audio waveform as an oscilloscope trace across the middle. Default false.
- `reaction?: number` — Multiplier on the shared impact displacement, 0..10; 0 keeps the ambient motion without explosion waves. Default 1.

### `TripBackdropHandle`

```ts
interface TripBackdropHandle
```

The current backdrop controller. Replacing a backdrop retires its previous controller.

- `set(config: TripBackdropConfig): void` — Patch the settings live; the merged result is validated first, so a refused patch changes nothing. Inert once replaced or removed.
- `wake(config: TripWakeConfig): void` — Emit a background-only wake; 24 fixed shader segments, oldest recycled.
- `remove(): void` — Remove this background. Idempotent.

### `TripBackdropStyle`

```ts
type TripBackdropStyle = 'grid' | 'rings' | 'plasma' | 'tunnel' | 'raster' | 'hex' | 'triangles' | 'diamonds' | 'dots' | 'checker' | 'circuit' | 'contours' | 'interference' | 'starfield' | 'aurora' | 'nebula' | 'scanlines' | 'waves' | 'spiral' | 'kaleidoscope'
```

Procedural raster backgrounds; all rendered on a fullscreen 2D plane.

### `TripWakeConfig`

```ts
interface TripWakeConfig
```

A water-like wave emitted along a world-space drag segment.

- `x: number` — End position in world units.
- `y: number` — End position in world units.
- `fromX?: number` — Start position; defaults to x for a point ripple.
- `fromY?: number` — Start position; defaults to y for a point ripple.
- `strength?: number` — Displacement in world units, -100..100; negative pulls. Default 14.
- `width?: number` — Wave packet width in world units, 2..300. Default 28.
- `speed?: number` — Outward travel in world units/sec, 0..1000. Default 90.
- `duration?: number` — Seconds until completely settled, 0.05..10. Default 2.5.

---

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