Options

To dictate & restrict what the map can and should do, regardless of its contents, it needs some guidance!

It provides options that can be categorized into three main parts:

• Initial positioning Defines the location of the map when it is first loaded

• Permanent rules Defines restrictions that last throughout the map's lifetime

• Event handling Defines methods that are called on specific map events

MapOptions class - flutter_map library - Dart API

Initial Positioning

Changing these properties after the map has already been built for the first time will have no effect: they only apply on initialisation.

To control the map programatically, use a MapController: Controllers & Cameras.

One part of MapOptions responsibilities is to define how the map should be positioned when first loaded. There's two ways to do this (that are incompatible):

• initialCenter (LatLng) & initialZoom

• initialCameraFit

  • by bounds (): CameraFit.bounds

  • by bounds (): CameraFit.insideBounds

  • by coordinates (): CameraFit.coordinates

It is possible to also set the map's initialRotation in degrees, if you don't want it North (0°) facing initially.

If rotation is enabled/allowed, if using initialCameraFit, prefer defining it by coordinates for a more intended/tight fit.

Permanent Rules

One part of MapOptions responsibilities is to define the restrictions and limitations of the map and what users can/cannot do with it.

Some of the options are described elsewhere in this documentation, in context. In addition, the API docs show all the available options, and below is a partial list of options:

• cameraConstraint

  • camera bounds inside bounds: CameraConstraint.bounds

  • camera center inside bounds: CameraConstraint.center

  • unconstrained (default): CameraConstraint.unconstrained

• maxZoom and minZoom Sets a hard limit on the maximum and minimum amounts that the map can be zoomed

• interactionOptions Configures the gestures that the user can use to interact with the map - for example, disable rotation or configure cursor/keyboard rotation

Instead of maxZoom (or in addition to), consider setting maxNativeZoom per TileLayer instead, to allow tiles to scale (and lose quality) on the final zoom level, instead of setting a hard limit.

Custom CRS

FM does have some support for using alternative CRSs.

Custom CRSs