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GMSCameraPosition Class Reference

GMSCameraPosition Class Reference

Overview

An immutable class that aggregates all camera position parameters.

Inherited by GMSMutableCameraPosition.

Public Member Functions

(id) - initWithTarget:zoom:bearing:viewingAngle:
 Designated initializer.

Static Public Member Functions

(instancetype) + cameraWithTarget:zoom:
 Convenience constructor for GMSCameraPosition for a particular target and zoom level.
(instancetype) + cameraWithLatitude:longitude:zoom:
 Convenience constructor for GMSCameraPosition, as per cameraWithTarget:zoom:.
(instancetype) + cameraWithTarget:zoom:bearing:viewingAngle:
 Convenience constructor for GMSCameraPosition, with all camera properties as per initWithTarget:zoom:bearing:viewingAngle:.
(instancetype) + cameraWithLatitude:longitude:zoom:bearing:viewingAngle:
 Convenience constructor for GMSCameraPosition, with latitude/longitude and all other camera properties as per initWithTarget:zoom:bearing:viewingAngle:.
(float) + zoomAtCoordinate:forMeters:perPoints:
 Get the zoom level at which meters distance, at given coord on Earth, correspond to the specified number of screen points.

Properties

CLLocationCoordinate2D target
 Location on the Earth towards which the camera points.
float zoom
 Zoom level.
CLLocationDirection bearing
 Bearing of the camera, in degrees clockwise from true north.
double viewingAngle
 The angle, in degrees, of the camera from the nadir (directly facing the Earth).

Member Function Documentation

- (id) initWithTarget: (CLLocationCoordinate2D)  target
zoom: (float)  zoom
bearing: (CLLocationDirection)  bearing
viewingAngle: (double)  viewingAngle 

Designated initializer.

Configures this GMSCameraPosition with all available camera properties. Building a GMSCameraPosition via this initializer (or by the following convenience constructors) will implicitly clamp camera values.

Parameters:
targetLocation on the earth towards which the camera points.
zoomThe zoom level near the center of the screen.
bearingBearing of the camera in degrees clockwise from true north.
viewingAngleThe angle, in degrees, of the camera angle from the nadir (directly facing the Earth)
+ (instancetype) cameraWithTarget: (CLLocationCoordinate2D)  target
zoom: (float)  zoom 

Convenience constructor for GMSCameraPosition for a particular target and zoom level.

This will set the bearing and viewingAngle properties of this camera to zero defaults (i.e., directly facing the Earth's surface, with the top of the screen pointing north).

+ (instancetype) cameraWithLatitude: (CLLocationDegrees)  latitude
longitude: (CLLocationDegrees)  longitude
zoom: (float)  zoom 

Convenience constructor for GMSCameraPosition, as per cameraWithTarget:zoom:.

+ (instancetype) cameraWithTarget: (CLLocationCoordinate2D)  target
zoom: (float)  zoom
bearing: (CLLocationDirection)  bearing
viewingAngle: (double)  viewingAngle 

Convenience constructor for GMSCameraPosition, with all camera properties as per initWithTarget:zoom:bearing:viewingAngle:.

+ (instancetype) cameraWithLatitude: (CLLocationDegrees)  latitude
longitude: (CLLocationDegrees)  longitude
zoom: (float)  zoom
bearing: (CLLocationDirection)  bearing
viewingAngle: (double)  viewingAngle 

Convenience constructor for GMSCameraPosition, with latitude/longitude and all other camera properties as per initWithTarget:zoom:bearing:viewingAngle:.

+ (float) zoomAtCoordinate: (CLLocationCoordinate2D)  coordinate
forMeters: (CLLocationDistance)  meters
perPoints: (CGFloat)  points 

Get the zoom level at which meters distance, at given coord on Earth, correspond to the specified number of screen points.

For extremely large or small distances the returned zoom level may be smaller or larger than the minimum or maximum zoom level allowed on the camera.

This helper method is useful for building camera positions that contain specific physical areas on Earth.


Property Documentation

- (CLLocationCoordinate2D) target [read, assign]

Location on the Earth towards which the camera points.

Implemented in GMSMutableCameraPosition.

- (float) zoom [read, assign]

Zoom level.

Zoom uses an exponentional scale, where zoom 0 represents the entire world as a 256 x 256 square. Each successive zoom level increases magnification by a factor of 2. So at zoom level 1, the world is 512x512, and at zoom level 2, the entire world is 1024x1024.

Implemented in GMSMutableCameraPosition.

- (CLLocationDirection) bearing [read, assign]

Bearing of the camera, in degrees clockwise from true north.

Implemented in GMSMutableCameraPosition.

- (double) viewingAngle [read, assign]

The angle, in degrees, of the camera from the nadir (directly facing the Earth).

0 is straight down, 90 is parallel to the ground. Note that the maximum angle allowed is dependent on the zoom. You can think of it as a series of line segments as a function of zoom, rather than a step function. For zoom 16 and above, the maximum angle is 65 degrees. For zoom 10 and below, the maximum angle is 30 degrees.

Implemented in GMSMutableCameraPosition.

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