/// <summary>
/// On Drop event on canvas add new dragged item to the canvas at drop point
/// </summary>
private void dropNewObject(object sender, DragEventArgs e)
{
// Get the object that was dropped
InterstellaObject DroppedObject = e.Data.GetData(typeof(InterstellaObject)) as InterstellaObject;
// If Failed to get object return
if (DroppedObject == null)
{
return;
}
// Get the point at which the object was dropped as a vector
Point DropPoint = e.GetPosition((Canvas)sender);
Vector DropPositionVector = new Vector(DropPoint.X, DropPoint.Y);
// Find and set the relative position in the model of this object
// It is Important that these are done in this order!
DropPositionVector = Helpers.Centrlize(DropPositionVector, Helpers.CanvasOrigin.TopLeft);
DropPositionVector -= CanvasPageViewModel.PanVector;
DropPositionVector = CanvasPageViewModel.InverseSeperationScaler(DropPositionVector);
DropPositionVector += CanvasPageViewModel.RadiusScale(DroppedObject.Radius);
DroppedObject.Position = DropPositionVector;
// Use the View Model to add the object, at this position, to the model
_VM.AddObject(new InterstellaObject(DroppedObject));
}
/// <summary>
/// On Mouse Up over object if a new object has been dropped put this into orbit around this object
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void OjectMouseUp(object sender, MouseButtonEventArgs e)
{
// Get the view model of the object that mouse was releasd over
InterstellaObjectViewModel SenderVM = ((Ellipse)sender).DataContext as InterstellaObjectViewModel;
// If drag is active, and object overwhich the mouse was released is not the same as the drag object
if (_DragActive && SenderVM != _DraggedObject)
{
// Calculate the velocity require of the drag object to orbit the other
Vector OrbitVelocity = CanvasPageViewModel.GetOrbitVelocity(_DraggedObject.InterstellaObject, SenderVM.InterstellaObject);
//set the object's velocity to the calculated above, and end the drag operation
_DraggedObject.SetObjectVelocity(OrbitVelocity);
_DragActive = false;
}
}
/// <summary>
/// When the mouse is released over the page, record the point of release and if a drag is active change the velocity of the drag object.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void CanvasPage_MouseUp(object sender, MouseButtonEventArgs e)
{
// Get the position at which the house was released relative to the canvas
_MouseReleasePoint = e.GetPosition((ItemsControl)sender);
// If a drag drop is in process..
if (_DragActive)
{
// Find the difference between the mouse up and down points relative to the centre of the canvas
Vector CentralReleasePoint = Helpers.Centrlize(new Vector(_MouseReleasePoint.X, _MouseReleasePoint.Y), Helpers.CanvasOrigin.TopLeft);
Vector CentralDownPoint = Helpers.Centrlize(new Vector(_MouseDownPoint.X, _MouseDownPoint.Y), Helpers.CanvasOrigin.TopLeft);
Vector DownReleaseDifference = CentralReleasePoint - CentralDownPoint;
// And use it to set the object's velocity and end the drag operation
_DraggedObject.InterstellaObject.Velocity = DownReleaseDifference * 2E2;
_DragActive = false;
}
}
/// <summary>
/// On key down check against key bindings
/// </summary>
private void CanvasPage_KeyDown(object sender, KeyEventArgs e)
{
// If this is the first tick for which the key is down add it to keys down
if (!e.IsRepeat)
{
_KeysDown.Add(e.Key);
}
// get a shortened identifer to the canvas page view model instance
// (for readability)
CanvasPageViewModel CPVM = CanvasPageViewModel.Instance;
// If the Key Down is a Pan Key.
if (_PanKeys.Contains(e.Key))
{
// If key is a repeat, add one to the pan amount
if (!e.IsRepeat)
{
_PanAmount = 1;
}
else if (_PanAmount < 25)
{
_PanAmount += 1;
}
// start the pan vector as 0,0
Vector panVector = new Vector(0, 0);
// add pan amount for every pan key that is down.
foreach (var Key in _KeysDown)
{
if (Key == Key.W || Key == Key.Up)
{
panVector.Y += _PanAmount;
}
else if (Key == Key.A || Key == Key.Left)
{
panVector.X -= _PanAmount;
}
else if (Key == Key.S || Key == Key.Down)
{
panVector.Y -= _PanAmount;
}
else if (Key == Key.D || Key == Key.Left)
{
panVector.X += _PanAmount;
}
}
// Pan the system by the pan vector
CanvasPageViewModel.Pan(panVector);
}
// Switch for other control keys
switch (e.Key)
{
// On Either Plus key, incriment system speed
case Key.OemPlus:
case Key.Add:
if (CPVM.SystemSpeed + 0.5 >= 0.5 && CPVM.SystemSpeed + 0.5 <= 20)
{
CPVM.SystemSpeed += 0.5;
}
break;
// On Either Minus key, decriment system speed
case Key.OemMinus:
case Key.Subtract:
if (CPVM.SystemSpeed - 0.5 >= 0.5 && CPVM.SystemSpeed - 0.5 <= 20)
{
CPVM.SystemSpeed -= 0.5;
}
break;
// Toggle System running on P
case Key.P:
if (!e.IsRepeat && CPVM.SystemRunning)
{
CPVM.SystemRunning = false;
}
else if (!e.IsRepeat)
{
CPVM.SystemRunning = true;
}
// Close Data Entry Box when play, regardless of data altered or not.
if (CanvasPageViewModel.Instance.DataBoxVisible)
{
CanvasPageViewModel.Instance.HideDataEntryBox.Execute(null);
}
break;
// Pause, and open the canvas escape menu on escape. Or vise verser for closing.
case Key.Escape:
if (!CanvasPageViewModel.Instance.SystemRunning && CanvasPageViewModel.Instance.EscMenu.Visiblity)
{
CanvasPageViewModel.Instance.Play();
}
else
{
CanvasPageViewModel.Instance.Pause();
}
CanvasPageViewModel.Instance.EscMenu.ToggleEscMenu();
break;
}
}
