How to use react-native-anchor-point with React Native Reanimated?

You can integrate it by applying the `withAnchorPoint` function to transform styles within Reanimated's animation code, but ensure compatibility with worklets or native threads for optimal performance, as it's a JavaScript utility.

react-native-anchor-point vs CSS-in-JS libraries for transform origin in React Native?

react-native-anchor-point is focused solely on native-like anchor point control for 3D transforms, whereas CSS-in-JS libraries might not handle 3D consistently. Choose this library for precise, cross-platform behavior similar to CSS transform-origin.

How to animate the anchor point dynamically over time?

The library doesn't support dynamic anchor point changes out of the box; you need to recalculate transforms on each animation frame using `withAnchorPoint` within your animation loop, which can be done with React Native's Animated API or Reanimated.

Does react-native-anchor-point work with Expo projects?

Yes, it's a pure JavaScript library with no native linking required, so it should work seamlessly with Expo's managed workflow, as long as React Native is set up correctly.

What are good alternatives for 3D rotations in React Native?

Alternatives include using react-native-reanimated for more comprehensive animations, native modules for platform-specific control, or CSS-in-JS solutions, but react-native-anchor-point is best for focused anchor point needs.

How to set anchor point to a corner for a card flip animation?

Use `withAnchorPoint` with anchor coordinates like {x: 0, y: 0} for top-left, and apply it to your transform styles, similar to the example in the README for rotating around custom points with specified width and height.

Open-Awesome

react-native-anchor-point

MITTypeScript

A React Native utility that provides CSS-like transform-origin functionality for better 3D transform animations.

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209 stars13 forks0 contributors

What is react-native-anchor-point?

react-native-anchor-point is a React Native utility library that provides CSS-like transform-origin functionality for 3D transform animations. It allows developers to set custom anchor points (like pivot points in Android or anchor points in iOS) for transforms, enabling more realistic and complex 3D rotations and animations. This solves the limitation in React Native where transforms default to rotating around the center, making advanced animations difficult.

Target Audience

React Native developers building apps with complex 3D animations or UI effects, particularly those needing precise control over transform pivot points similar to CSS or native platforms.

Value Proposition

Developers choose this library because it fills a specific gap in React Native's animation capabilities, offering a simple, lightweight solution for anchor point control without requiring native code or complex workarounds.

Overview

Provides a function like transform-origin in css, anchor point in iOS, pivot point in Android. It makes3D transform animation better in React-Native.

Use Cases

Best For

Creating 3D card flip animations with custom pivot points
Building complex UI components that rotate around edges or corners
Implementing CSS-like transform-origin behavior in React Native
Achieving consistent cross-platform 3D transform animations
Enhancing React Native animations with precise anchor control
Developing interactive 3D effects in mobile apps

Not Ideal For

Projects that only require basic 2D animations without custom pivot points
Apps with strict performance constraints where 3D transform overhead is prohibitive
Teams seeking a full-featured animation library with pre-built components and effects

Pros & Cons

Pros

Precise Anchor Control

Enables setting custom pivot points for transforms, similar to CSS transform-origin, as demonstrated in the example with rotateX and perspective for realistic 3D effects.

Simple API Integration

Provides a single `withAnchorPoint` function that easily integrates with existing transform styles, making it straightforward to adopt without overhauling animation code.

Cross-Platform Consistency

Delivers consistent transform behavior across iOS and Android, mimicking standards from CSS and native platforms, as highlighted in the key features.

3D Transform Support

Works with 3D properties like perspective, rotateX, and rotateY, enabling complex animations as shown in the GIF examples of rotating elements.

Cons

Niche Functionality

Only addresses anchor point control, so for complete animation solutions, developers need to pair it with other libraries like React Native's Animated or Reanimated, adding complexity.

Minimal Documentation

The README provides only a basic example; advanced usage, edge cases, or integration with other animation tools are not covered in detail, which might hinder adoption.

Performance Considerations

3D transforms can be resource-intensive on mobile devices, and this library doesn't include optimizations for smooth animations at scale, relying on React Native's underlying performance.

Frequently Asked Questions

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