private void KineticTranslateChildren(double xTranslationDelta, double yTranslationDelta)
{
// Determine the distance of the last finger movement.
var distance = Math.Sqrt(Math.Pow(xTranslationDelta, 2) + Math.Pow(yTranslationDelta, 2));
// Determine the proportion of the x and y components.
var xProportion = Math.Abs(distance / xTranslationDelta);
var yProportion = Math.Abs(distance / yTranslationDelta);
// Determine the max translation distance. The idea is to stop the kinetic scrolling when there are no more visible Hexes.
var farthestHexes = _space.GetFarthestHexes(new Hex(0, 0));
var farthestHex = farthestHexes.Any() ? farthestHexes.First() : new Hex(0, 0);
var(farX, farY) = _hex2Pix.ToPix(farthestHex, Size);
var farthestHexDistanceToCenter = Math.Max(_content.Width / 2.0d, _content.Height / 2.0d) + Math.Sqrt(Math.Pow(farX, 2) + Math.Pow(farY, 2));
// Continue moving in the same direction
this.AnimateKinetic(KineticScrollAnimationName,
(sign, velocity) =>
{
// Direction is kept by accounting for the proportion of the x/y component.
_xTranslation += Math.Sign(xTranslationDelta) * velocity / xProportion;
_yTranslation += Math.Sign(yTranslationDelta) * velocity / yProportion;
ScaleTranslateChildren();
// If the kinetic scrolling translated past the max distance then stop.
var totalTranslation = Math.Sqrt(Math.Pow(_xTranslation, 2) + Math.Pow(_yTranslation, 2));
return(totalTranslation <= farthestHexDistanceToCenter);
},
distance,
0.05d,
() =>
{
// When the kinetic animation is finished, just snap to the nearest Hex
SnapToNearestHex();
});
}
