public override bool Update(GameTime gameTime, TouchCollection currentTouch, out TouchStateBase nextState)
{
if (currentTouch.Count != 2)
{
TouchStateMachine.SubmitGestureEvent(new TwoFingeredDragEventArgs(GestureTiming.Completed, new Vector2()));
nextState = new CooldownState();
return(true);
}
if (currentTouch[0].TryGetPreviousLocation(out var prevFinger1) &&
currentTouch[1].TryGetPreviousLocation(out var prevFinger2))
{
nextState = null;
if (!Vector2.Normalize(prevFinger1.Position - currentTouch[0].Position)
.MovingInSameDirection(Vector2.Normalize(prevFinger2.Position - currentTouch[1].Position)))
{
TouchStateMachine.SubmitGestureEvent(new TwoFingeredDragEventArgs(GestureTiming.Completed, new Vector2()));
nextState = new RotateAndScaleState();
return(true);
}
}
var midpoint = Vector2.Lerp(currentTouch[0].Position, currentTouch[1].Position, 0);
TouchStateMachine.SubmitGestureEvent(new TwoFingeredDragEventArgs(GestureTiming.InProgress, midpoint));
nextState = null;
return(false);
}
/// <summary>
/// Updates the current machine state
/// </summary>
/// <param name="gameTime">The game time.</param>
/// <param name="currentTouch">The current touch.</param>
/// <param name="nextState">The next state in the state machine.</param>
/// <returns>
/// A value indicating whether or not the state machine should advance to the next state
/// </returns>
public override bool Update(GameTime gameTime, TouchCollection currentTouch, out TouchStateBase nextState)
{
this.delayTimer += gameTime.ElapsedGameTime.Milliseconds;
if (this.delayTimer > TouchStateMachine.Configuration.TapDelay)
{
TouchStateMachine.SubmitGestureEvent(new TapEventArgs(this.TapLocation, GestureTiming.Completed));
nextState = new CooldownState();
return(true);
}
var touched = currentTouch.Any();
if (!touched && this.fingerDown)
{
// TODO: detect if taps are far apart and start a new tap
nextState = new CooldownState();
TouchStateMachine.SubmitGestureEvent(new DoubleTapEventArgs(this.TapLocation));
return(true);
}
if (touched)
{
this.fingerDown = true;
}
nextState = null;
return(false);
}
public override bool Update(GameTime gameTime, TouchCollection currentTouch, out TouchStateBase nextState)
{
if (currentTouch.Count != 1)
{
nextState = new CooldownState();
TouchStateMachine.SubmitGestureEvent(new DragEventArgs(GestureTiming.Completed, new Vector2()));
return(true);
}
TouchStateMachine.SubmitGestureEvent(new DragEventArgs(GestureTiming.InProgress, currentTouch.First().Position));
nextState = null;
return(false);
}
public override bool Update(GameTime gameTime, TouchCollection currentTouch, out TouchStateBase nextState)
{
switch (currentTouch.Count)
{
case 1:
nextState = new DragState();
TouchStateMachine.SubmitGestureEvent(new DragEventArgs(GestureTiming.Started, currentTouch[0].Position));
return(true);
case 2:
TouchStateMachine.SubmitGestureEvent(new RotateAndScaleEventArgs(GestureTiming.Started, 0, 0));
nextState = new RotateAndScaleState();
return(true);
default:
// bail because no gesture is active anymore
nextState = new WaitingState();
return(true);
}
}
/// <summary>
/// Updates the current machine state
/// </summary>
/// <param name="gameTime">The game time.</param>
/// <param name="currentTouch">The current touch.</param>
/// <param name="nextState">The next state in the state machine.</param>
/// <returns>
/// A value indicating whether or not the state machine should advance to the next state
/// </returns>
public override bool Update(GameTime gameTime, TouchCollection currentTouch, out TouchStateBase nextState)
{
this.touchedTimer += gameTime.ElapsedGameTime.Milliseconds;
if (this.touchedTimer > TouchStateMachine.Configuration.TouchDelay || currentTouch.Count > 1)
{
nextState = new GestureActiveState();
return(true);
}
if (currentTouch.Any())
{
if (currentTouch.Count == 1)
{
var prevFirst = this.previousTouch[0].Position;
var currFirst = currentTouch[0].Position;
var direction = Vector2.Normalize(currFirst - prevFirst);
var distance = Vector2.Distance(currFirst, prevFirst);
if (distance > TouchStateMachine.Configuration.FlickDistance)
{
TouchStateMachine.SubmitGestureEvent(new FlickEventArgs(prevFirst, direction, distance));
nextState = new CooldownState();
return(true);
}
}
this.previousTouch = currentTouch;
nextState = null;
return(false);
}
TouchStateMachine.SubmitGestureEvent(new TapEventArgs(this.previousTouch[0].Position, GestureTiming.Started));
nextState = new TappedState(this.previousTouch[0].Position);
return(true);
}
public override bool Update(GameTime gameTime, TouchCollection currentTouch, out TouchStateBase nextState)
{
if (currentTouch.Count != 2)
{
TouchStateMachine.SubmitGestureEvent(new RotateAndScaleEventArgs(GestureTiming.Completed, 0, 0));
nextState = new CooldownState();
return(true);
}
if (!currentTouch[0].TryGetPreviousLocation(out var prevFinger1) ||
!currentTouch[1].TryGetPreviousLocation(out var prevFinger2))
{
nextState = null;
return(false);
}
if (Vector2.Normalize(prevFinger1.Position - currentTouch[0].Position)
.MovingInSameDirection(Vector2.Normalize(prevFinger2.Position - currentTouch[1].Position)))
{
var pos = Vector2.Lerp(currentTouch[0].Position, currentTouch[1].Position, 0);
TouchStateMachine.SubmitGestureEvent(new TwoFingeredDragEventArgs(GestureTiming.Started, pos));
nextState = new TwoFingeredDragState();
return(true);
}
var currZoom = Vector2.Distance(currentTouch[0].Position, currentTouch[1].Position);
var prevZoom = Vector2.Distance(prevFinger1.Position, prevFinger2.Position);
var currAngle = (currentTouch[0].Position - currentTouch[1].Position).GetAngleDegrees();
var prevAngle = (prevFinger1.Position - prevFinger2.Position).GetAngleDegrees();
var diff = currAngle - prevAngle;
// Round tiny numbers to zero to stop drift
if (Math.Abs(diff) < .3)
{
diff = 0;
}
// Handle very large or very small rotation amounts caused by gimbal locks
else if (diff > 340)
{
diff = 360 - diff;
}
else if (diff < -340)
{
diff = -(360 + diff);
}
var zoom = currZoom - prevZoom;
// Round tiny numbers to zero to stop drift
if (Math.Abs(zoom) < 1)
{
zoom = 0;
}
TouchStateMachine.SubmitGestureEvent(new RotateAndScaleEventArgs(GestureTiming.InProgress, zoom, diff));
nextState = null;
return(false);
}