Keyframes

Keyframe (abstract)

Base class for all keyframes. Handles position in the timeline editor and selection state.

Extend it and implement createMenu(), which returns the popup UI for editing this keyframe's properties.

Protected fields

Field	Type	Description
x, y	int	Position in the editor UI
tick	int	Temporal position
isSelected	boolean	Selection state
layer	CutsceneLayer	Parent layer

Constants

Constant	Value	Description
SIZE	7	Visual size in the editor
KEYFRAME_SPRITE	Identifier	Default sprite
KEYFRAME_SELECTED_SPRITE	Identifier	Selected sprite

KeyframeMenu<T extends Keyframe> (abstract)

Contextual popup UI for editing keyframe properties. Implement getContentHeight, renderContent, applyChanges, and initContent.

Constants

Constant	Value
WIDTH	110
PADDING	5
BUTTON_HEIGHT	14
BUTTON_WIDTH	50

KeyframeSegment<K extends Keyframe>

Record holding the two keyframes around a tick and the Catmull-Rom control points.

record KeyframeSegment<K extends Keyframe>(
    K from,      // start keyframe
    K to,        // end keyframe
    K p0,        // control point before `from`
    K p3,        // control point after `to`
    double rawT  // normalized t in [0, 1]
)

Produced by CutsceneLayer.findSegment(...).

EasingType

Value	Interpolation
LINEAR	Linear
EASE_IN	Accelerating
EASE_OUT	Decelerating
SMOOTH	Ease in + out

Interpolation

Utility class for animating values between keyframes.

// Apply an easing curve to t in [0, 1]
double t2 = Interpolation.applyEasing(EasingType.SMOOTH, t);

// Standard lerp
double v = Interpolation.lerp(a, b, t);

// Angular lerp (handles 0 to 360 wrap)
double angle = Interpolation.lerpAngle(fromDeg, toDeg, t);

// Catmull-Rom (4 control points)
double v = Interpolation.catmullRom(p0, p1, p2, p3, t);