HaxePunk/HaxePunk

package haxepunk.tweens.misc;

import haxepunk.Tween;
import haxepunk.utils.Ease.EaseFunction;

/**
 * Tweens a numeric value.
 */
class NumTween extends Tween
{
    /**
     * The current value.
     */
    public var value:Float = 0;

    /**
     * Constructor.
     * @param    complete    Optional completion callback.
     * @param    type        Tween type.
     */
    public function new(?type:TweenType)
    {
        super(0, type);
    }

    /**
     * Tweens the value from one value to another.
     * @param    fromValue        Start value.
     * @param    toValue            End value.
     * @param    duration        Duration of the tween.
     * @param    ease            Optional easer function.
     */
    public function tween(fromValue:Float, toValue:Float, duration:Float, ?ease:EaseFunction)
    {
        _start = value = fromValue;
        _range = toValue - value;
        _target = duration;
        _ease = ease;
        start();
    }

    /** @private Updates the Tween. */
    @:dox(hide)
    override function updateInternal()
    {
        value = _start + _range * _t;
    }

    // Tween information.
    var _start:Float;
    var _range:Float;
}