Camera and animations
The camera position controls how the map is displayed. The camera position is a combination of its location, zoom, tilt, and rotation. To change the user’s view of the map, change the camera position. The map in the Map Display module is represented as a globe, so that the sizes and shapes of features are not distorted.
The default position of the camera is:
- Located at 0 latitude and 0 longitude.
- With a zoom of 0, which shows the whole globe.
- Rotated to be north-up.
- Tilted to point straight down.
Changing the camera position does not affect the map style, markers or any other map configuration.
In the Map Display module, every change to the camera’s position has to be done using the
CameraOptions class. It specifies the camera’s location, zoom, tilt, and rotation to set.
The location is the geographical coordinate marking where the camera view should be pointed. The map view is always centered on it.
The position is specified with a
The camera zoom can be set between 0 and 22. Approximate zoom scales:
- 0 - The camera is fully zoomed out the whole globe is visible.
- 5 - Country-level.
- 10 - City-level.
- 15 - Neighborhood-level.
- 20 - Street-level.
- 22 - Maximum zoom in.
The tilt is the angle from the nadir (the camera pointing toward the center of the earth), where the tilt is set to zero 0. When the tilt is 90, the camera is pointing towards the horizon.
The closer the tilt level approaches 90, the more tiles may need to be downloaded. This can result in high data usage.
Sets the cardinal direction that the camera is heading. By default, the rotation is set to 0, meaning that the orientation of the map is toward the north. The direction increases as the camera rotates clockwise. This means that east is 90 degrees, south is 180 degrees, and west is 270.
You can access the current camera position by calling the
TomTomMap.cameraPosition() method on the
TomTomMap instance. The
CameraPosition object that is returned contains a snapshot of the camera’s location, zoom, tilt, and rotation.
The Map Display module provides two ways of changing the camera position: transitioning with a smooth animation or moving immediately to the new position.
To animate a camera move, first define
CameraOptions with the new camera position. Then use the
AnimationDuration class to set the duration of the animation. The animation time is set to 1.5 seconds by default.
The animation can also be monitored, so that you receive a notification when it completes or it is cancelled. You can cancel an animation by moving the camera before the animation is finished.
The Map Display module allows you to set how the camera tracks the user locations to suit different interaction modes. Do this by setting
CameraTrackingMode to the
TomTomMap instance. There are five options for tracking mode:
NONE- The camera does not track the user’s location. This is the default setting and is mainly used to show the user’s location on the map.
FOLLOW- The camera follows the user’s location, but its tilt and zoom do not change.
FOLLOW_ROUTE- The camera follows the user’s location and heading to best present the route. Camera properties like tilt and zoom may be adjusted to better display the route and its guidance instructions.
FOLLOW_DIRECTION- The camera follows the user’s location and heading to position the camera in the heading direction. Camera is always following from the top (the tilt is set to 0 degrees).
ROUTE_OVERVIEW- The camera tries to fit the routes in the current view, by changing the zoom level and other camera properties.
The last three modes are mainly used in navigation applications.
To apply a given tracking mode, call the
To check what tracking mode is currently set:
The camera position can be modified by calling
animateCamera. But users can also affect the camera when they use gestures to interact with the map. You can listen to camera changes by setting
OnCameraChangeListenerreports on every change of a camera property. Be aware that doing too much inside this listener can slow down the application.
OnCameraSteadyListenerreports when any camera property changes, but there are no more changes planned.
Both listeners can be removed when they are no longer needed. To remove them, call
removeOnCameraSteadyListener on the
TomTomMap instance to which listeners were added. Specify which listener you want to remove by providing it as a parameter to the methods listed above.
Since you have learned how to manipulate camera positions, here are the recommended next steps: