// Must be true if from new instance of collection
private void removeAllPins(bool isFromNewCollection)
{
if (xMap.pins == null)
return;
// Get the segregated pin type by flat value to avoid multiple instance of the same pin to be added
var mapLockedFeatureCollection = xMap.pins.Where((Pin pin) => pin.IsCenterAndFlat);
var normalFeatureCollection = xMap.pins.Where((Pin pin) => !pin.IsCenterAndFlat);
var flatPinsSource = (MGLShapeSource)nStyle.SourceWithIdentifier(mapLockedPinsSourceKey);
var normalPinsSource = (MGLShapeSource)nStyle.SourceWithIdentifier(normalPinsSourceKey);
// Just set to empty pins, this will also refreshes with the latest pin and the old pins removed
flatPinsSource.Shape = MGLShapeCollectionFeature.ShapeCollectionWithShapes(mapLockedFeatureCollection.toShapeSourceArray());
normalPinsSource.Shape = MGLShapeCollectionFeature.ShapeCollectionWithShapes(normalFeatureCollection.toShapeSourceArray());
// Usubscribe each pin to change monitoring
if (xMap.oldPins != null) {
foreach (var pin in xMap.oldPins)
pin.PropertyChanged -= Pin_PropertyChanged;
xMap.oldPins.CollectionChanged -= Pins_CollectionChanged;
}
if (isFromNewCollection)
xMap.pins.CollectionChanged += Pins_CollectionChanged;
// Subcribe each new pin to change monitoring
foreach (var pin in xMap.pins)
pin.PropertyChanged += Pin_PropertyChanged;
}
void DrawPolyline()
{
var jsonPath = NSBundle.MainBundle.PathForResource("example", "geojson");
NSData data = NSFileManager.DefaultManager.Contents(jsonPath);
NSError err;
MGLShapeCollectionFeature shapeCollectionFeature = (MGLShapeCollectionFeature)MGLShape.ShapeWithData(data, (uint)NSStringEncoding.UTF8, out err);
MGLPolylineFeature polyline = (MGLPolylineFeature)shapeCollectionFeature.Shapes.First();
mapView.AddAnnotation(polyline);
}
private void updatePins(Pin pin)
{
// The image is the type/class key
string key = pin.image;
// Find a source that has the same image as this pin
var uiImage = nStyle.ImageForName(key);
// Get all pins with the same flat value
var pinsWithSimilarKey = xMap.pins.Where((Pin arg) => arg.IsCenterAndFlat == pin.IsCenterAndFlat);
// If there are existing image of the same type the reuse
if (uiImage != null) {
MGLShapeSource geoJsonSource;
// Edit the proper source
if (pin.IsCenterAndFlat)
geoJsonSource = (MGLShapeSource)nStyle.SourceWithIdentifier(mapLockedPinsSourceKey);
else
geoJsonSource = (MGLShapeSource)nStyle.SourceWithIdentifier(normalPinsSourceKey);
// Refresh entire source when a pin is added to a specific source
geoJsonSource.Shape = MGLShapeCollectionFeature.ShapeCollectionWithShapes(pinsWithSimilarKey.toShapeSourceArray());
}
}
private void addAllPins()
{
if (xMap.pins == null)
return;
// Subscribe all pins to their respective changes
foreach (var pin in xMap.pins)
pin.PropertyChanged += Pin_PropertyChanged;
// Add the mapLocked pins first
// Select all pins where it has heading setter activated
var mapLockedFeatureCollection = xMap.pins.Where((Pin pin) => pin.IsCenterAndFlat).toShapeSourceArray();
var mapLockedPinSource = (MGLShapeSource)nStyle.SourceWithIdentifier(mapLockedPinsSourceKey);
mapLockedPinSource.Shape = MGLShapeCollectionFeature.ShapeCollectionWithShapes(mapLockedFeatureCollection);
// Add the normal pins after
// Select all pins where it has heading disabled
var normalFeatureCollection = xMap.pins.Where((Pin pin) => !pin.IsCenterAndFlat).toShapeSourceArray();
var normalPinSource = (MGLShapeSource)nStyle.SourceWithIdentifier(normalPinsSourceKey);
normalPinSource.Shape = MGLShapeCollectionFeature.ShapeCollectionWithShapes(normalFeatureCollection);
}
/// <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
}
public static MGLShapeCollectionFeature toShapeCollectionFeature(this IEnumerable <Route> routes)
{
return(MGLShapeCollectionFeature.ShapeCollectionWithShapes(routes.toFeatureList().ToArray()));
}
