[osx] Map camera

Shared MGLMapCamera between iOS and OS X. Unfortunately -camera and -setCamera: implementations need to be copy-pasted for now.

1 files changed, 101 insertions, 0 deletions

diff --git a/platform/darwin/MGLMapCamera.mm b/platform/darwin/MGLMapCamera.mm
new file mode 100644
index 0000000000..d04e46fa90
--- /dev/null
+++ b/platform/darwin/MGLMapCamera.mm
@@ -0,0 +1,101 @@
+#import "MGLMapCamera.h"
+
+#include <mbgl/util/projection.hpp>
+
+@implementation MGLMapCamera
+
++ (BOOL)supportsSecureCoding
+{
+    return YES;
+}
+
++ (instancetype)camera
+{
+    return [[self alloc] init];
+}
+
++ (instancetype)cameraLookingAtCenterCoordinate:(CLLocationCoordinate2D)centerCoordinate
+                              fromEyeCoordinate:(CLLocationCoordinate2D)eyeCoordinate
+                                    eyeAltitude:(CLLocationDistance)eyeAltitude
+{
+    mbgl::LatLng centerLatLng = mbgl::LatLng(centerCoordinate.latitude, centerCoordinate.longitude);
+    mbgl::LatLng eyeLatLng = mbgl::LatLng(eyeCoordinate.latitude, eyeCoordinate.longitude);
+    
+    mbgl::ProjectedMeters centerMeters = mbgl::Projection::projectedMetersForLatLng(centerLatLng);
+    mbgl::ProjectedMeters eyeMeters = mbgl::Projection::projectedMetersForLatLng(eyeLatLng);
+    CLLocationDirection heading = std::atan((centerMeters.northing - eyeMeters.northing) /
+                                            (centerMeters.easting - eyeMeters.easting));
+    
+    double groundDistance = std::hypot(centerMeters.northing - eyeMeters.northing,
+                                       centerMeters.easting - eyeMeters.easting);
+    CGFloat pitch = std::atan(eyeAltitude / groundDistance);
+    
+    return [[self alloc] initWithCenterCoordinate:centerCoordinate
+                                         altitude:eyeAltitude
+                                            pitch:pitch
+                                          heading:heading];
+}
+
++ (instancetype)cameraLookingAtCenterCoordinate:(CLLocationCoordinate2D)centerCoordinate
+                                   fromDistance:(CLLocationDistance)distance
+                                          pitch:(CGFloat)pitch
+                                        heading:(CLLocationDirection)heading
+{
+    return [[self alloc] initWithCenterCoordinate:centerCoordinate
+                                         altitude:distance
+                                            pitch:(CGFloat)pitch
+                                          heading:heading];
+}
+
+- (instancetype)initWithCenterCoordinate:(CLLocationCoordinate2D)centerCoordinate
+                                altitude:(CLLocationDistance)altitude
+                                   pitch:(CGFloat)pitch
+                                 heading:(CLLocationDirection)heading
+{
+    if (self = [super init])
+    {
+        _centerCoordinate = centerCoordinate;
+        _altitude = altitude;
+        _pitch = pitch;
+        _heading = heading;
+    }
+    return self;
+}
+
+- (nullable instancetype)initWithCoder:(NSCoder *)coder
+{
+    if (self = [super init])
+    {
+        _centerCoordinate = CLLocationCoordinate2DMake([coder decodeDoubleForKey:@"centerLatitude"],
+                                                       [coder decodeDoubleForKey:@"centerLongitude"]);
+        _altitude = [coder decodeDoubleForKey:@"altitude"];
+        _pitch = [coder decodeDoubleForKey:@"pitch"];
+        _heading = [coder decodeDoubleForKey:@"heading"];
+    }
+    return self;
+}
+
+- (void)encodeWithCoder:(NSCoder *)coder
+{
+    [coder encodeDouble:_centerCoordinate.latitude forKey:@"centerLatitude"];
+    [coder encodeDouble:_centerCoordinate.longitude forKey:@"centerLongitude"];
+    [coder encodeDouble:_altitude forKey:@"altitude"];
+    [coder encodeDouble:_pitch forKey:@"pitch"];
+    [coder encodeDouble:_heading forKey:@"heading"];
+}
+
+- (id)copyWithZone:(nullable NSZone *)zone
+{
+    return [[[self class] allocWithZone:zone] initWithCenterCoordinate:_centerCoordinate
+                                                              altitude:_altitude
+                                                                 pitch:_pitch
+                                                               heading:_heading];
+}
+
+- (NSString *)description
+{
+    return [NSString stringWithFormat:@"<MKMapCamera %p centerCoordinate:%f, %f altitude:%.0fm heading:%.0f° pitch:%.0f°>",
+            self, _centerCoordinate.latitude, _centerCoordinate.longitude, _altitude, _heading, _pitch];
+}
+
+@end