AnimationDeveloperSamples.MapLayerEffectsKeyframe.Interpolate C# (CSharp) Method

        public void Interpolate(IAGAnimationTrack pTrack, IAGAnimationContainer pContainer,
            object pObject, int propertyIndex, double time, IAGKeyframe pNextKeyframe,
            IAGKeyframe pPrevKeyframe, IAGKeyframe pAfterNextKeyframe)
        {
            if (time < TimeStamp || time > pNextKeyframe.TimeStamp)
                return;

            double timeFactor;
            timeFactor = (time - TimeStamp) / (pNextKeyframe.TimeStamp - TimeStamp); //ignoring pPrevKeyframe and pAfterNextKeyframe
            if (propertyIndex == 0) //interpolate brightness
            {
                short brightnessInterpolated;
                short brightnessStart;
                short brightnessEnd;
                brightnessStart = brightness;
                brightnessEnd = System.Convert.ToInt16(pNextKeyframe.get_PropertyValue(0));
                brightnessInterpolated = System.Convert.ToInt16(timeFactor * (brightnessEnd - brightnessStart) + brightnessStart);
                SetBrightness((ILayer)pObject, brightnessInterpolated);
                bObjectsNeedRefresh = true;
            }
            else //interpolate contrast
            {
                short contrastInterpolated;
                short contrastStart;
                short contrastEnd;
                contrastStart = contrast;
                contrastEnd = System.Convert.ToInt16(pNextKeyframe.get_PropertyValue(1));
                contrastInterpolated = System.Convert.ToInt16(timeFactor * (contrastEnd - contrastStart) + contrastStart);
                SetContrast((ILayer)pObject, contrastInterpolated);
                bObjectsNeedRefresh = true;
            }
            return;
        }