public TwoFingerGesture(NSSet touches, ARSCNView view, VirtualObject parentObject, VirtualObjectManager manager) : base(touches, view, parentObject, manager)
{
var tArray = touches.ToArray <UITouch>();
FirstTouch = tArray[0];
SecondTouch = tArray[1];
var firstTouchPoint = FirstTouch.LocationInView(SceneView);
var secondTouchPoint = SecondTouch.LocationInView(SceneView);
InitialMidpoint = firstTouchPoint.Add(secondTouchPoint).Divide(2f);
// Compute the two other corners of the rectangle defined by the two fingers
// and compute the points in between.
var thirdCorner = new CGPoint(firstTouchPoint.X, secondTouchPoint.Y);
var fourthCorner = new CGPoint(secondTouchPoint.X, firstTouchPoint.Y);
// Compute points in between.
var midpoints = new[]
{
thirdCorner.Add(firstTouchPoint).Divide(2f),
thirdCorner.Add(secondTouchPoint).Divide(2f),
fourthCorner.Add(firstTouchPoint).Divide(2f),
fourthCorner.Add(secondTouchPoint).Divide(2f),
InitialMidpoint.Add(firstTouchPoint).Divide(2f),
InitialMidpoint.Add(secondTouchPoint).Divide(2f),
InitialMidpoint.Add(thirdCorner).Divide(2f),
InitialMidpoint.Add(fourthCorner).Divide(2f)
};
// Check if any of the two fingers or their midpoint is touching the object.
// Based on that, translation, rotation and scale will be enabled or disabled.
var allPoints = new List <CGPoint>(new[] { firstTouchPoint, secondTouchPoint, thirdCorner, fourthCorner, InitialMidpoint });
allPoints.AddRange(midpoints);
FirstTouchedObject = allPoints.Select(pt => this.VirtualObjectAt(pt)).Where(vo => vo != null).FirstOrDefault();
if (FirstTouchedObject != null)
{
ObjectBaseScale = FirstTouchedObject.Scale.X;
AllowTranslation = true;
AllowRotation = true;
InitialDistanceBetweenFingers = (firstTouchPoint.Subtract(secondTouchPoint)).Length();
InitialFingerAngle = Math.Atan2(InitialMidpoint.X, InitialMidpoint.Y);
InitialObjectAngle = FirstTouchedObject.EulerAngles.Y;
}
else
{
AllowTranslation = false;
AllowRotation = false;
}
}
public static void DrawText(CGContext context, string text, CGPoint position, TextStyle textStyle)
{
if (string.IsNullOrEmpty(text))
{
return;
}
UIGraphics.PushContext(context);
textStyle.Color.SetColor();
var textRect = new CGRect(new CGPoint(), text.StringSize(textStyle.Font));
position = position.Add(textStyle.Offset);
textRect = textRect.LocateAtPosition(position, textStyle.Position);
text.DrawString(textRect, textStyle.Font);
UIGraphics.PopContext();
}
void SetupRings(int itemCount)
{
// Define some nice colors.
var borderColorSelected = UIColor.FromHSBA(0.07f, 0.81f, 0.98f, 1).CGColor;
var borderColorNormal = UIColor.DarkGray.CGColor;
var fillColorSelected = UIColor.FromHSBA(0.07f, 0.21f, 0.98f, 1);
var fillColorNormal = UIColor.White;
// We define generators to return closures which we use to define
// the different states of our item ring views.
Func <RingView, Action> selectedGenerator = (view) => () => {
view.Layer.BorderColor = borderColorSelected;
view.BackgroundColor = fillColorSelected;
};
Func <RingView, Action> normalGenerator = (view) => () => {
view.Layer.BorderColor = borderColorNormal;
view.BackgroundColor = fillColorNormal;
};
CGPoint startPosition = Bounds.GetCenter();
Func <RingView, Action> locationNormalGenerator = (view) => () => {
view.Center = startPosition;
if (!view.Selected)
{
view.Alpha = 0;
}
};
Func <RingView, CGVector, Action> locationFanGenerator = (view, offset) => () => {
view.Center = startPosition.Add(offset);
view.Alpha = 1;
};
// tau is a full circle in radians
var tau = NMath.PI * 2;
var absoluteRingSegment = tau / 4;
var requiredLengthPerRing = RingRadius * 2 + 5;
var totalRequiredCirlceSegment = requiredLengthPerRing * (itemCount - 1);
var fannedControlRadius = NMath.Max(requiredLengthPerRing, totalRequiredCirlceSegment / absoluteRingSegment);
var normalDistance = new CGVector(0, -fannedControlRadius);
var scale = UIScreen.MainScreen.Scale;
// Setup our item views.
for (int index = 0; index < itemCount; index++)
{
var view = new RingView(Bounds);
view.StateClosures [Selected] = selectedGenerator(view);
view.StateClosures [Normal] = normalGenerator(view);
nfloat angle = index / (nfloat)(itemCount - 1) * absoluteRingSegment;
var fan = normalDistance.Apply(MakeRotation(angle)).RoundTo(scale);
view.StateClosures [LocationFan] = locationFanGenerator(view, fan);
view.StateClosures [LocationOrigin] = locationNormalGenerator(view);
AddSubview(view);
RingViews.Add(view);
var gr = new UITapGestureRecognizer(Tap);
view.AddGestureRecognizer(gr);
}
// Setup the initial selection state.
var rv = RingViews [0];
AddSubview(rv);
rv.Selected = true;
selectedView = rv;
UpdateViews(animated: false);
}
public static CGPoint MidPoint(this CGPoint self, CGPoint point)
{
return(self.Add(point).Divide(2f));
}
