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There is a newer version: 0.9.0

package ru.casperix.spine.animation

class ShearTimeline(
    override val boneIndex: Int,
    override val frames: List,
) : AbstractTimeline(frames), CurveTimeline1, BoneTimeline {
    val xFrames = frames.map { createFrame(it.time, it.x, it.curve, 0) }
    val yFrames = frames.map { createFrame(it.time, it.y, it.curve, 1) }

    override fun apply(context: AnimationContext) = context.run {
        val bone = skeleton.bones[boneIndex]
        if (bone.isActive) {
            val x = FrameCalculator.getRelativeValue(xFrames, time, weight, blend, bone.local.shearX, bone.data.local.shearX, false)
            val y = FrameCalculator.getRelativeValue(yFrames, time, weight, blend, bone.local.shearY, bone.data.local.shearY, false)
            bone.local = bone.local.copy(shearX = x, shearY = y)
        }
    }


}