commonMain.io.nacular.doodle.animation.transition.StepTransition.kt Maven / Gradle / Ivy

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A pure Kotlin, UI framework for the Web

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package io.nacular.doodle.animation.transition

import io.nacular.doodle.animation.Moment
import io.nacular.measured.units.Measure
import io.nacular.measured.units.Time
import io.nacular.measured.units.Units

/**
 * Created by Nicholas Eddy on 3/30/18.
 */
public class StepTransition(private val delay: Measure, remaining: Measure, private val finalValue: Measure): FixedDuration(delay + remaining) {
    init {
        require(delay.amount >= 0    ) { "delay must be positive"     }
        require(remaining.amount >= 0) { "remaining must be positive" }
    }

    override fun value   (initial: Moment, timeOffset: Measure): Moment = Moment(if (timeOffset < delay) initial.position else finalValue, initial.velocity)
    override fun endState(initial: Moment                           ): Moment = Moment(finalValue, initial.velocity)
}