/// <summary>
/// Construct Object ViewModel as a wrap around a <see cref="InterstellaObject"/> to present it to a CanvasPage
/// </summary>
/// <param name="interstellaObject"></param>
public InterstellaObjectViewModel(InterstellaObject interstellaObject)
{
_InterstellaObject = interstellaObject;
// Subcribe to the Interstellar Object's updated event
_InterstellaObject.ObjectUpdated += interstellaObject_ObjectUpdated;
}
/// <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>
/// Get the velocity an object needs to orbit a second object at its current distance
/// </summary>
/// <param name="interstellaObject"></param>
/// <param name="objectToOrbit"></param>
static public Vector GetOrbitVelocity(InterstellaObject interstellaObject, InterstellaObject objectToOrbit)
{
// Seperation, Large object - small object
Vector R1R2 = objectToOrbit.Position - interstellaObject.Position;
Vector R1R2Unit = R1R2 / R1R2.Magnitude;
// Calculate Magnitude Of Velocity, V = GM/|r|
double VectorMag = Math.Sqrt((6.674E-11 * objectToOrbit.Mass) / R1R2.Magnitude);
// Velocity should be at a normal to the force. So multiply by normal to force unit vector.
Vector Velocity = VectorMag * R1R2Unit.Normal;
// Randomize orbit direction and Add the velocity of the obejct to orbit too the relative velocity to orbit.
if (Helpers.RNG.Next(0, 1) == 1)
{
Velocity += objectToOrbit.Velocity;
}
else
{
Velocity = (-1 * Velocity) + objectToOrbit.Velocity;
}
return(Velocity);
}
/// <summary>
/// Add an obect to the logical system being displayed by the canvas page.
/// </summary>
/// <param name="newInterstellaObject"></param>
public void AddObject(InterstellaObject newInterstellaObject)
{
// Add the object ot the syste,
System.AddObject(newInterstellaObject);
// Notify the view the canvas objects have changed
NotifyPropertyChanged(this, nameof(CanvasObjects));
// Create and add a view model for the object and add it to the side bar
//InterstellaObjectViewModel newObjectVm = new InterstellaObjectViewModel(newInterstellaObject);
//SideBarVM.InfoPannelVM.AddDisplayObject(newObjectVm);
}