/// <summary>
/// Performs input handling for the Load Level UI grid in lieu of default grid drag.
/// </summary>
/// <param name="camera"></param>
public override void HandleTouchInput(Camera camera)
{
TouchContact touch = TouchInput.GetOldestTouch();
if (touch == null)
{
return;
}
if (touch.phase == TouchPhase.Ended)
{
isDragging = false;
return;
}
else if (!isDragging)
{
// This touch hasn't yet been classified as a drag yet.. so we
// will see if it meets the criteria.
float minDiff = MIN_DRAG_START;
float diff = (touch.position - touch.startPosition).Length();
if (diff < minDiff)
{
return;
}
else
{
isDragging = true;
}
}
// Get local coordinates difference between this touch position and the previous
Matrix localInvMatrix = Matrix.Invert(LocalMatrix);
Vector2 currentLocalPos = TouchInput.GetLocalXYFromScreenCoords(
touch.position,
camera,
ref localInvMatrix);
Vector2 previousLocalPos = TouchInput.GetLocalXYFromScreenCoords(
touch.previousPosition,
camera,
ref localInvMatrix);
float localXMove = (currentLocalPos - previousLocalPos).X;
if (SlideByX(localXMove))
{
// We did a successful move, so capture the momentum of the touch in pixels/frame
float duration = 1.0f;
if (Math.Abs(localXMove) > 0.2f)
{
residualVelocity = localXMove / 4.0f;
hasResidualVelocity = true;
TwitchManager.Set <float> set = velocityDelegate;
TwitchManager.CreateTwitch <float>(residualVelocity, 0, set, duration,
TwitchCurve.Shape.EaseOut);
}
else if (touch.phase == TouchPhase.Stationary)
{
// If the user has stopped moving but hasn't ended his touch, we will put
// the brakes on any residual velocity, as the user probably wants to settle
// here.
residualVelocity = 0.0f;
hasResidualVelocity = false;
}
}
}