Transform & Movement

Basic layer transformations mapping Alight Motion values to Bevy.

• Position: ✅ Supported (Linear interpolation)
• Rotation: ✅ Supported (Z-axis rotation)
• Scale: ✅ Supported (Uniform and Non-uniform)
• Pivot: ✅ Supported (Anchor point with position compensation)

Associated Test Files:

• basic_pivot.amproj
• basic_frame.amproj
• basic_bounce_box.amproj

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Technical Details & Implementation

Coordinate System

AM uses a top-left origin with Y increasing downwards. Bevy uses a center origin with Y increasing upwards. Formula: bevy_x = am_x - width/2, bevy_y = height/2 - am_y.

Pivot Compensation

In AM, changing the pivot point doesn't move the layer visually. We replicate this by applying a translation offset calculated from the pivot shift to maintain visual consistency.

Hierarchy

Layer parenting is implemented using Bevy's native parent-child system, ensuring transformation propagation.