Exemplo n.º 1
0
        public static List <NSObject> toFeatureList(this IEnumerable <Pin> pins)
        {
            var features = new List <NSObject>();

            foreach (var pin in pins)
            {
                // Skip if the pin is hidden
                if (!pin.isVisible)
                {
                    continue;
                }

                var feature = new MGLPointFeature {
                    Coordinate = new CLLocationCoordinate2D(pin.position.latitude, pin.position.longitude)
                };

                object[] offset = { pin.iconOffset.X, pin.iconOffset.Y };               //[x,y] coordinates Positive values indicate right and down
                feature.Attributes = NSDictionary <NSString, NSObject> .FromObjectsAndKeys(
                    new object[] {
                    pin.image,
                    pin.heading,
                    pin.imageScaleFactor,
                    NSArray.FromObjects(offset),
                    pin.id
                },
                    new object[] {
                    MapboxRenderer.pin_image_key,
                    MapboxRenderer.pin_rotation_key,
                    MapboxRenderer.pin_size_key,
                    MapboxRenderer.pin_offset_key,
                    MapboxRenderer.pin_id_key
                }
                    );

                features.Add(feature);
            }

            return(features);
        }
Exemplo n.º 2
0
		/// <summary>
		/// This has a problem, if the same pin updates a couple of times a second pin might jump suddenly to the
		/// 2nd to latest position then smooth animate to the latest position, but I think this is ok logically since
		/// By the time it's animating its final animation position is not really up to date.
		/// </summary>
		/// <param name="pin">Pin.</param>
		private void animateLocationChange(Pin pin)
		{
			#region Simultaneous pin update
			System.Threading.Tasks.Task.Run(async () => {
				// If there exist a pin that caused this update
				if (isPinAnimating)
					return;

				//// Wait for pin position assignment in the same call
				isPinAnimating = true;

				// Get all pins with the same key and same flat value (animatable pins)
				var pinsWithSimilarKey = xMap.pins.Where(
					(Pin arg) => arg.IsCenterAndFlat == pin.IsCenterAndFlat).ToArray();

				Device.BeginInvokeOnMainThread(() => {
					var geoJsonSource = (MGLShapeSource)nStyle.SourceWithIdentifier(mapLockedPinsSourceKey);

					var visibleMovablePinCount = pinsWithSimilarKey.Count(p => p.isVisible);
					var currentHeadingCollection = new double[visibleMovablePinCount];
					var features = new NSObject[visibleMovablePinCount];

					// Update the entire frame
					MapBox.Extensions.MapExtensions.animatePin(
						(double d) => {
							System.Threading.Tasks.Task.Run(() => {
								for (int i = 0; i < visibleMovablePinCount; i++) {
									var p = pinsWithSimilarKey[i];
									Position theCurrentAnimationJump = p.position;
									double theCurrentHeading = p.heading;

									// Only update the pin if it is the pin that cause this animation call
									// OR the if it actually requested for a position update before this current animation has not been finished
									if (pin == p || p.requestForUpdate) {
										theCurrentAnimationJump = SphericalUtil.interpolate(p.previousPinPosition, p.position, d);
										theCurrentHeading = SphericalUtil.computeHeading(p.previousPinPosition, p.position);
									}
									currentHeadingCollection[i] = theCurrentHeading;

									var feature = new MGLPointFeature {
										Coordinate = new CLLocationCoordinate2D(theCurrentAnimationJump.latitude,
																				theCurrentAnimationJump.longitude)
									};
									feature.Attributes = NSDictionary<NSString, NSObject>.FromObjectsAndKeys(
										new object[] {
                                                p.image,
												theCurrentHeading,
												p.imageScaleFactor,
												p.id
										},
										new object[] {
												MapboxRenderer.pin_image_key,
												MapboxRenderer.pin_rotation_key,
												MapboxRenderer.pin_size_key,
												MapboxRenderer.pin_id_key
										});

									// Add to the new animation frame
									features[i] = feature;
								}

								// Update the entire layer
								Device.BeginInvokeOnMainThread(() => geoJsonSource.Shape = MGLShapeCollectionFeature.ShapeCollectionWithShapes(features));
							});
						},
						async (d, b) => {
							// DO NOT REMOVE, this is essential for the simultaneous pin location update to work
							await System.Threading.Tasks.Task.Delay(500);

							isPinAnimating = false;

							// Stabilize the pins, at this moment all the pins are updated
							for (int i = 0; i < visibleMovablePinCount; i++) {
								var p = pinsWithSimilarKey[i];
								// To avoid triggering heading property change event
								p.PropertyChanged -= Pin_PropertyChanged;
								p.requestForUpdate = false;
								p.heading = currentHeadingCollection[i];
								p.PropertyChanged += Pin_PropertyChanged;
							}
						}, 500);
				});
			});
			#endregion
		}