Flesh out the imperative API

4 files changed, 1156 insertions, 58 deletions

diff --git a/README.md b/README.md
index 72b7d71..a9c6b95 100644
--- a/README.md
+++ b/README.md
@@ -33,25 +33,7 @@ import elmMapbox from "elm-mapbox";
 var app = elmMapbox(Elm.MyApp.fullscreen(), {token: 'pk45.rejkgnwejk'});
 ```
 
-Next, optionally, setup a ports module:
-
-```elm
-port module MapCommands exposing (flyTo)
-
-import Json.Decode exposing (Value)
-import Mapbox.Cmd as Cmd
-
-port elmMapboxOutgoing : Value -> Cmd msg
-
-port elmMapboxIncoming : (Cmd.Response -> msg) -> Sub msg
-
-mapId =
-    {- this is whatever the `id` attribute on your map is -}
-    "my-map"
-
-flyTo =
-    Cmd.flyTo elmMapboxOutgoing mapId
-```
+Next, optionally, setup a ports module. The best way to do this is to to copy [this file](examples/MapCommands.elm) into your project.
 
 This will allow you to easily use the commands to control parts of your map interactions imperatively.
 
@@ -70,7 +52,7 @@ import Mapbox.Expression as E exposing (false, float, int, str, true)
 import Mapbox.Layer as Layer
 import Mapbox.Source as Source
 import Mapbox.Style as Style exposing (Style(..))
-import MapCmd
+import MapCommands
 
 
 main =
@@ -101,7 +83,7 @@ update msg model =
             ( { model | position = lngLat }, Cmd.none )
 
         Click { lngLat } ->
-            ( model, MapCmd.fitBounds ( mapPair (\a -> a - 0.2) lngLat, mapPair (\a -> a + 0.2) lngLat ) )
+            ( model, MapCommands.fitBounds [] ( mapPair (\a -> a - 0.2) lngLat, mapPair (\a -> a + 0.2) lngLat ) )
 
 style =
     Style
@@ -139,7 +121,40 @@ style =
 view model =
     div [ style [ ( "width", "100vw" ), ( "height", "100vh" ) ] ]
         [ css
-        , map [ onMouseMove Hover, onClick Click, id "my-map"] style
+        , map [ onMouseMove Hover, onClick Click, id MapCommands.id ] style
         , div [ style [ ( "position", "absolute" ), ( "bottom", "20px" ), ( "left", "20px" ) ] ] [ text (toString model.position) ]
         ]
 ```
+
+### Support
+
+This library is supported in all modern browsers. The `elmMapbox` library
+has a `supported` function that can be injected via flags:
+
+```javascript
+import elmMapbox from "elm-mapbox";
+
+var app = elmMapbox(Elm.MyApp.fullscreen({
+  mapboxSupported: elmMapbox.supported({
+    // If  true , the function will return  false if the performance of
+    // Mapbox GL JS would be dramatically worse than expected (e.g. a
+    // software WebGL renderer would be used).
+    failIfMajorPerformanceCaveat: true
+  })
+}));
+```
+
+### Customizing the JS side
+
+The `elmMapbox` function accepts an options object that takes the following options:
+
+ - `token`: the Mapbox token. If you don't pass it here, you will need to use the `token` Elm attribute.
+ - `outgoingPort`: the name of the outgoing port. Default: `elmMapboxOutgoing`.
+ - `incomingPort`: the name of the incoming port. Default `elmMapboxIncoming`.
+ - `easingFunctions`: an object whose values are easing functions (i.e. they take a number between 0..1 and return a number between 0..1). You can refer to these with the `easing` option in the Cmd module.
+
+### License
+
+(c) Jakub Hampl 2018
+
+MIT License
diff --git a/examples/MapCommands.elm b/examples/MapCommands.elm
new file mode 100644
index 0000000..1670eca
--- /dev/null
+++ b/examples/MapCommands.elm
@@ -0,0 +1,457 @@
+port module MapCommands exposing (id, duration, easing, offset, animate, panBy, panTo, zoomTo, zoomIn, zoomOut, rotateTo, jumpTo, easeTo, flyTo, curve, minZoom, speed, screenSpeed, maxDuration, stop, center, zoom, bearing, pitch, around, fitBounds, padding, linear, maxZoom, setRTLTextPlugin, Response, queryResults, getBounds, queryRenderedFeatures, Query, layers, filter)
+
+{-| This module has a bunch of essentially imperative commands for your map.
+
+@docs Option
+
+
+### Animation options
+
+Options common to map movement commands that involve animation, such as panBy and easeTo, controlling the duration and easing function of the animation. All properties are optional.
+
+@docs duration, easing, offset, animate
+
+
+### Moving the map around
+
+@docs panBy, panTo, zoomTo, zoomIn, zoomOut, rotateTo, jumpTo, easeTo, flyTo, curve, minZoom, speed, screenSpeed, maxDuration, stop
+
+
+### Camera Options
+
+Options common to `jumpTo`, `easeTo`, and `flyTo`, controlling the desired location, zoom, bearing, and pitch of the camera. All properties are optional, and when a property is omitted, the current camera value for that property will remain unchanged.
+
+@docs center, zoom, bearing, pitch, around
+
+
+### Fiting bounds
+
+@docs fitBounds, padding, Padding, linear, maxZoom
+
+
+### Right-to-left
+
+@docs setRTLTextPlugin
+
+
+### Querying the map
+
+@docs Response, queryResults, getBounds, queryRenderedFeatures, Query, layers, filter
+
+-}
+
+import Mapbox.Cmd as Template exposing (Option, Supported)
+import Json.Decode as Decode
+import Json.Encode as Encode exposing (Value)
+import Mapbox.Element exposing (LngLat, Viewport)
+import Mapbox.Expression exposing (DataExpression, Expression)
+
+
+port elmMapboxOutgoing : Value -> Cmd msg
+
+
+{-| Maps should use this as their DOM id.
+-}
+id : Template.Id
+id =
+    "my-map"
+
+
+
+-- AnimationOptions
+
+
+{-| The animation's duration, measured in milliseconds.
+-}
+duration : Int -> Option { a | duration : Supported }
+duration =
+    Template.duration
+
+
+{-| The name of an easing function. These must be passed to `elmMapbox`
+in the `easingFunctions` option.
+-}
+easing : String -> Option { a | easing : Supported }
+easing =
+    Template.easing
+
+
+{-| Offset of the target center relative to real map container center at the end of animation.
+-}
+offset : ( Int, Int ) -> Option { a | offset : Supported }
+offset =
+    Template.offset
+
+
+{-| If false, no animation will occur.
+-}
+animate : Bool -> Option { a | animate : Supported }
+animate =
+    Template.animate
+
+
+{-| The desired center.
+-}
+center : LngLat -> Option { a | center : Supported }
+center =
+    Template.center
+
+
+{-| The desired zoom level.
+-}
+zoom : Float -> Option { a | zoom : Supported }
+zoom =
+    Template.zoom
+
+
+{-| The desired bearing, in degrees. The bearing is the compass direction that is "up"; for example, a bearing of 90° orients the map so that east is up.
+-}
+bearing : Float -> Option { a | bearing : Supported }
+bearing =
+    Template.bearing
+
+
+{-| The desired pitch, in degrees.
+-}
+pitch : Float -> Option { a | pitch : Supported }
+pitch =
+    Template.pitch
+
+
+{-| If `zoom` is specified, `around` determines the point around which the zoom is centered.
+-}
+around : LngLat -> Option { a | around : Supported }
+around =
+    Template.around
+
+
+{-| The amount of padding in pixels to add to the given bounds.
+-}
+padding : Template.Padding -> Option { a | padding : Supported }
+padding =
+    Template.padding
+
+
+{-| If true, the map transitions using `easeTo` . If false, the map transitions using `flyTo`.
+-}
+linear : Bool -> Option { a | linear : Supported }
+linear =
+    Template.linear
+
+
+{-| The maximum zoom level to allow when the map view transitions to the specified bounds.
+-}
+maxZoom : Float -> Option { a | maxZoom : Supported }
+maxZoom =
+    Template.maxZoom
+
+
+{-| The zooming "curve" that will occur along the flight path.
+A high value maximizes zooming for an exaggerated animation, while a
+low value minimizes zooming for an effect closer to `easeTo`.
+1.42 is the average value selected by participants in the user study discussed in [van Wijk (2003)](https://www.win.tue.nl/~vanwijk/zoompan.pdf).
+A value of `6 ^ 0.25` would be equivalent to the root mean squared average velocity. A value of 1 would produce a circular motion.
+-}
+curve : Float -> Option { a | curve : Supported }
+curve =
+    Template.curve
+
+
+{-| The zero-based zoom level at the peak of the flight path.
+If `curve` is specified, this option is ignored.
+-}
+minZoom : Float -> Option { a | minZoom : Supported }
+minZoom =
+    Template.minZoom
+
+
+{-| The average speed of the animation defined in relation to `curve`. A speed of 1.2 means that the map appears to move along the flight path by 1.2 times `curve` screenfuls every second. A screenful is the map's visible span. It does not correspond to a fixed physical distance, but varies by zoom level.
+-}
+speed : Float -> Option { a | speed : Supported }
+speed =
+    Template.speed
+
+
+{-| The average speed of the animation measured in screenfuls per second, assuming a linear timing curve. If `speed` is specified, this option is ignored.
+-}
+screenSpeed : Float -> Option { a | screenSpeed : Supported }
+screenSpeed =
+    Template.screenSpeed
+
+
+{-| The animation's maximum duration, measured in milliseconds. If duration exceeds maximum duration, it resets to 0.
+-}
+maxDuration : Float -> Option { a | maxDuration : Supported }
+maxDuration =
+    Template.maxDuration
+
+
+{-| Resizes the map according to the dimensions of its container element.
+
+This command must be sent after the map's container is resized, or when the map is shown after being initially hidden with CSS.
+
+-}
+resize : Cmd msg
+resize =
+    Template.resize elmMapboxOutgoing id
+
+
+{-| Pans and zooms the map to contain its visible area within the specified geographical bounds. This function will also reset the map's bearing to 0 if bearing is nonzero.
+-}
+fitBounds :
+    List
+        (Option
+            { padding : Supported
+            , easing : Supported
+            , linear : Supported
+            , offset : Supported
+            , maxZoom : Supported
+            }
+        )
+    -> ( LngLat, LngLat )
+    -> Cmd msg
+fitBounds =
+    Template.fitBounds elmMapboxOutgoing id
+
+
+{-| Pans the map by the specified offest.
+-}
+panBy :
+    List
+        (Option
+            { duration : Supported
+            , easing : Supported
+            , offset : Supported
+            , animate : Supported
+            }
+        )
+    -> ( Int, Int )
+    -> Cmd msg
+panBy =
+    Template.panBy elmMapboxOutgoing id
+
+
+{-| Pans the map to the specified location, with an animated transition.
+-}
+panTo :
+    List
+        (Option
+            { duration : Supported
+            , easing : Supported
+            , offset : Supported
+            , animate : Supported
+            }
+        )
+    -> LngLat
+    -> Cmd msg
+panTo =
+    Template.panTo elmMapboxOutgoing id
+
+
+{-| Zooms the map to the specified zoom level, with an animated transition.
+-}
+zoomTo :
+    List
+        (Option
+            { duration : Supported
+            , easing : Supported
+            , offset : Supported
+            , animate : Supported
+            }
+        )
+    -> Float
+    -> Cmd msg
+zoomTo =
+    Template.zoomTo elmMapboxOutgoing id
+
+
+{-| Increases the map's zoom level by 1.
+-}
+zoomIn :
+    List
+        (Option
+            { duration : Supported
+            , easing : Supported
+            , offset : Supported
+            , animate : Supported
+            }
+        )
+    -> Cmd msg
+zoomIn =
+    Template.zoomIn elmMapboxOutgoing id
+
+
+{-| Decreases the map's zoom level by 1.
+-}
+zoomOut :
+    List
+        (Option
+            { duration : Supported
+            , easing : Supported
+            , offset : Supported
+            , animate : Supported
+            }
+        )
+    -> Cmd msg
+zoomOut =
+    Template.zoomOut elmMapboxOutgoing id
+
+
+{-| Rotates the map to the specified bearing, with an animated transition. The bearing is the compass direction that is "up"; for example, a bearing of 90° orients the map so that east is up.
+-}
+rotateTo :
+    List
+        (Option
+            { duration : Supported
+            , easing : Supported
+            , offset : Supported
+            , animate : Supported
+            }
+        )
+    -> Float
+    -> Cmd msg
+rotateTo =
+    Template.rotateTo elmMapboxOutgoing id
+
+
+{-| Changes any combination of center, zoom, bearing, and pitch, without an animated transition. The map will retain its current values for any details not specified in options.
+-}
+jumpTo :
+    List
+        (Option
+            { center : Supported
+            , zoom : Supported
+            , bearing : Supported
+            , pitch : Supported
+            , around : Supported
+            }
+        )
+    -> Cmd msg
+jumpTo =
+    Template.jumpTo elmMapboxOutgoing id
+
+
+{-| Changes any combination of center, zoom, bearing, and pitch, with an animated transition between old and new values. The map will retain its current values for any details not specified in options.
+-}
+easeTo :
+    List
+        (Option
+            { center : Supported
+            , zoom : Supported
+            , bearing : Supported
+            , pitch : Supported
+            , around : Supported
+            , duration : Supported
+            , easing : Supported
+            , offset : Supported
+            , animate : Supported
+            }
+        )
+    -> Cmd msg
+easeTo =
+    Template.easeTo elmMapboxOutgoing id
+
+
+{-| Changes any combination of center, zoom, bearing, and pitch, animating the transition along a curve that evokes flight. The animation seamlessly incorporates zooming and panning to help the user maintain her bearings even after traversing a great distance.
+-}
+flyTo :
+    List
+        (Option
+            { center : Supported
+            , zoom : Supported
+            , bearing : Supported
+            , pitch : Supported
+            , around : Supported
+            , duration : Supported
+            , easing : Supported
+            , offset : Supported
+            , animate : Supported
+            , curve : Supported
+            , minZoom : Supported
+            , speed : Supported
+            , screenSpeed : Supported
+            , maxDuration : Supported
+            }
+        )
+    -> Cmd msg
+flyTo =
+    Template.flyTo elmMapboxOutgoing id
+
+
+{-| Stops any animated transition underway.
+-}
+stop : Cmd msg
+stop =
+    Template.stop elmMapboxOutgoing id
+
+
+{-| Sets the map's [RTL text plugin](https://www.mapbox.com/mapbox-gl-js/plugins/#mapbox-gl-rtl-text). Necessary for supporting languages like Arabic and Hebrew that are written right-to-left. Takes a URL pointing to the Mapbox RTL text plugin source.
+-}
+setRTLTextPlugin : String -> Cmd msg
+setRTLTextPlugin =
+    Template.setRTLTextPlugin elmMapboxOutgoing id
+
+
+
+-- incoming
+
+
+{-| Responds with the map's geographical bounds. Takes a numerical ID that allows you to associate the question with the answer.
+-}
+getBounds : Int -> Cmd msg
+getBounds =
+    Template.getBounds elmMapboxOutgoing id
+
+
+{-| The geometry of the query region. Either a point, a bounding box (specified in terms of southwest and northeast points), or what is currently visible in the viewport.
+-}
+type alias Query =
+    Template.Query
+
+
+{-| Returns an array of GeoJSON Feature objects representing visible features that satisfy the query parameters. Takes a numerical ID that allows you to associate the question with the answer.
+
+The response: The properties value of each returned feature object contains the properties of its source feature. For GeoJSON sources, only string and numeric property values are supported (i.e. null, Array, and Object values are not supported).
+
+Each feature includes a top-level layer property whose value is an object representing the style layer to which the feature belongs. Layout and paint properties in this object contain values which are fully evaluated for the given zoom level and feature.
+
+Features from layers whose visibility property is "none", or from layers whose zoom range excludes the current zoom level are not included. Symbol features that have been hidden due to text or icon collision are not included. Features from all other layers are included, including features that may have no visible contribution to the rendered result; for example, because the layer's opacity or color alpha component is set to 0.
+
+The topmost rendered feature appears first in the returned array, and subsequent features are sorted by descending z-order. Features that are rendered multiple times (due to wrapping across the antimeridian at low zoom levels) are returned only once (though subject to the following caveat).
+
+Because features come from tiled vector data or GeoJSON data that is converted to tiles internally, feature geometries may be split or duplicated across tile boundaries and, as a result, features may appear multiple times in query results. For example, suppose there is a highway running through the bounding rectangle of a query. The results of the query will be those parts of the highway that lie within the map tiles covering the bounding rectangle, even if the highway extends into other tiles, and the portion of the highway within each map tile will be returned as a separate feature. Similarly, a point feature near a tile boundary may appear in multiple tiles due to tile buffering.
+
+-}
+queryRenderedFeatures : Int -> List (Option { layers : Supported, filter : Supported }) -> Query -> Cmd msg
+queryRenderedFeatures =
+    Template.queryRenderedFeatures elmMapboxOutgoing id
+
+
+{-| A list of style layer IDs for the query to inspect. Only features within these layers will be returned. If this parameter is not set, all layers will be checked.
+-}
+layers : List String -> Option { a | layers : Supported }
+layers =
+    Template.layers
+
+
+{-| A filter to limit query results.
+-}
+filter : Expression DataExpression Bool -> Option { a | filter : Supported }
+filter =
+    Template.filter
+
+
+{-| A response to the queries. See the relevant methods for more information.
+-}
+type alias Response =
+    Template.Response
+
+
+port elmMapboxIncoming : (Value -> msg) -> Sub msg
+
+
+{-| Recieve results from the queries
+-}
+queryResults : (Response -> msg) -> Sub msg
+queryResults =
+    Template.queryResults elmMapboxIncoming
diff --git a/src/Mapbox/Cmd.elm b/src/Mapbox/Cmd.elm
index 510c627..17cea13 100644
--- a/src/Mapbox/Cmd.elm
+++ b/src/Mapbox/Cmd.elm
@@ -1,58 +1,608 @@
-module Mapbox.Cmd exposing (..)
+module Mapbox.Cmd exposing (Id, Outgoing, Option, Supported, duration, easing, offset, animate, panBy, panTo, zoomTo, zoomIn, zoomOut, rotateTo, jumpTo, easeTo, flyTo, curve, minZoom, speed, screenSpeed, maxDuration, stop, center, zoom, bearing, pitch, around, fitBounds, padding, Padding, linear, maxZoom, setRTLTextPlugin, Response, queryResults, getBounds, queryRenderedFeatures, Query, layers, filter, resize)
 
 {-| This module has a bunch of essentially imperative commands for your map.
 
-However, since a published library can't have ports in it, you will need to do some setup. The easiest way to do this is to copy paste the following code into your app:
+@docs Id, Outgoing
 
-    import Json.Decode exposing (Value)
-    import Mapbox.Cmd as Cmd
+However, since a published library can't have ports in it, you will need to do some setup. The easiest way to do this is to copy [this file into your app](https://github.com/gampleman/elm-mapbox/blob/master/examples/MapCommands.elm).
 
-    port elmMapboxOutgoing : Value -> Cmd msg
+@docs Option, Supported
 
-    port elmMapboxIncoming : (Cmd.Response -> msg) -> Sub msg
 
-    mapId =
-        {- this is whatever the `id` attribute on your map is -}
-        "my-map"
+### Animation options
 
-    flyTo =
-        Cmd.flyTo elmMapboxOutgoing mapId
+Options common to map movement commands that involve animation, such as panBy and easeTo, controlling the duration and easing function of the animation. All properties are optional.
+
+@docs duration, easing, offset, animate
+
+
+### Moving the map around
+
+@docs panBy, panTo, zoomTo, zoomIn, zoomOut, rotateTo, jumpTo, easeTo, flyTo, curve, minZoom, speed, screenSpeed, maxDuration, stop
+
+
+### Camera Options
+
+Options common to `jumpTo`, `easeTo`, and `flyTo`, controlling the desired location, zoom, bearing, and pitch of the camera. All properties are optional, and when a property is omitted, the current camera value for that property will remain unchanged.
+
+@docs center, zoom, bearing, pitch, around
+
+
+### Fiting bounds
+
+@docs fitBounds, padding, Padding, linear, maxZoom
+
+
+### Other
+
+@docs setRTLTextPlugin, resize
+
+
+### Querying the map
+
+@docs Response, queryResults, getBounds, queryRenderedFeatures, Query, layers, filter
 
 -}
 
+import Json.Decode as Decode
 import Json.Encode as Encode exposing (Value)
 import Mapbox.Element exposing (LngLat, Viewport)
+import Mapbox.Expression exposing (DataExpression, Expression)
 
 
+{-| The type of a port that you need to provide for this module to work.
+-}
 type alias Outgoing msg =
     Value -> Cmd msg
 
 
+{-| Every command takes the DOM id of the map that it should operate on.
+-}
 type alias Id =
     String
 
 
+
+-- AnimationOptions
+
+
+{-| The animation's duration, measured in milliseconds.
+-}
+duration : Int -> Option { a | duration : Supported }
+duration =
+    Encode.int >> Option "duration"
+
+
+{-| The name of an easing function. These must be passed to `elmMapbox`
+in the `easingFunctions` option.
+-}
+easing : String -> Option { a | easing : Supported }
+easing =
+    Encode.string >> Option "easing"
+
+
+{-| Offset of the target center relative to real map container center at the end of animation.
+-}
+offset : ( Int, Int ) -> Option { a | offset : Supported }
+offset =
+    encodePair Encode.int >> Option "offset"
+
+
+{-| If false, no animation will occur.
+-}
+animate : Bool -> Option { a | animate : Supported }
+animate =
+    Encode.bool >> Option "animate"
+
+
+{-| The desired center.
+-}
+center : LngLat -> Option { a | center : Supported }
+center =
+    encodePair Encode.float >> Option "center"
+
+
+{-| The desired zoom level.
+-}
+zoom : Float -> Option { a | zoom : Supported }
+zoom =
+    Encode.float >> Option "zoom"
+
+
+{-| The desired bearing, in degrees. The bearing is the compass direction that is "up"; for example, a bearing of 90° orients the map so that east is up.
+-}
+bearing : Float -> Option { a | bearing : Supported }
+bearing =
+    Encode.float >> Option "bearing"
+
+
+{-| The desired pitch, in degrees.
+-}
+pitch : Float -> Option { a | pitch : Supported }
+pitch =
+    Encode.float >> Option "pitch"
+
+
+{-| If `zoom` is specified, `around` determines the point around which the zoom is centered.
+-}
+around : LngLat -> Option { a | around : Supported }
+around =
+    encodePair Encode.float >> Option "around"
+
+
+{-| The amount of padding in pixels to add to the given bounds.
+-}
+padding : Padding -> Option { a | padding : Supported }
+padding =
+    encodePadding >> Option "padding"
+
+
+{-| -}
+type alias Padding =
+    { top : Int, right : Int, bottom : Int, left : Int }
+
+
+encodePadding { top, right, bottom, left } =
+    Encode.object
+        [ ( "top", Encode.int top )
+        , ( "right", Encode.int right )
+        , ( "bottom", Encode.int bottom )
+        , ( "left", Encode.int left )
+        ]
+
+
+{-| If true, the map transitions using `easeTo` . If false, the map transitions using `flyTo`.
+-}
+linear : Bool -> Option { a | linear : Supported }
+linear =
+    Encode.bool >> Option "linear"
+
+
+{-| The maximum zoom level to allow when the map view transitions to the specified bounds.
+-}
+maxZoom : Float -> Option { a | maxZoom : Supported }
+maxZoom =
+    Encode.float >> Option "maxZoom"
+
+
+{-| The zooming "curve" that will occur along the flight path.
+A high value maximizes zooming for an exaggerated animation, while a
+low value minimizes zooming for an effect closer to `easeTo`.
+1.42 is the average value selected by participants in the user study discussed in [van Wijk (2003)](https://www.win.tue.nl/~vanwijk/zoompan.pdf).
+A value of `6 ^ 0.25` would be equivalent to the root mean squared average velocity. A value of 1 would produce a circular motion.
+-}
+curve : Float -> Option { a | curve : Supported }
+curve =
+    Encode.float >> Option "curve"
+
+
+{-| The zero-based zoom level at the peak of the flight path.
+If `curve` is specified, this option is ignored.
+-}
+minZoom : Float -> Option { a | minZoom : Supported }
+minZoom =
+    Encode.float >> Option "minZoom"
+
+
+{-| The average speed of the animation defined in relation to `curve`. A speed of 1.2 means that the map appears to move along the flight path by 1.2 times `curve` screenfuls every second. A screenful is the map's visible span. It does not correspond to a fixed physical distance, but varies by zoom level.
+-}
+speed : Float -> Option { a | speed : Supported }
+speed =
+    Encode.float >> Option "speed"
+
+
+{-| The average speed of the animation measured in screenfuls per second, assuming a linear timing curve. If `speed` is specified, this option is ignored.
+-}
+screenSpeed : Float -> Option { a | screenSpeed : Supported }
+screenSpeed =
+    Encode.float >> Option "screenSpeed"
+
+
+{-| The animation's maximum duration, measured in milliseconds. If duration exceeds maximum duration, it resets to 0.
+-}
+maxDuration : Float -> Option { a | maxDuration : Supported }
+maxDuration =
+    Encode.float >> Option "maxDuration"
+
+
 encodePair encoder ( a, b ) =
     Encode.list [ encoder a, encoder b ]
 
 
-fitBounds : Outgoing msg -> Id -> ( LngLat, LngLat ) -> Cmd msg
-fitBounds prt id bounds =
+decodePair decoder =
+    Decode.list decoder
+        |> Decode.andThen
+            (\l ->
+                case l of
+                    [ a, b ] ->
+                        Decode.succeed ( a, b )
+
+                    _ ->
+                        Decode.fail "Doesn't apear to be a pair"
+            )
+
+
+makeCmd : Outgoing msg -> Id -> String -> List ( String, Value ) -> Cmd msg
+makeCmd prt id command params =
     prt <|
         Encode.object
-            [ ( "command", Encode.string "fitBounds" )
-            , ( "target", Encode.string id )
-            , ( "bounds", encodePair (encodePair Encode.float) bounds )
-            ]
-
-
-
---
---
--- flyTo : Outgoing msg -> Id -> Viewport -> { curve : Float } -> Cmd msg
--- flyTo prt id desiredViewport options =
---     prt <|
---         Encode.object
---             [ ( "command", Encode.string "flyTo" )
---             , ( "target", Encode.string id )
---             ]
+            (( "command", Encode.string command )
+                :: ( "target", Encode.string id )
+                :: params
+            )
+
+
+{-| Resizes the map according to the dimensions of its container element.
+
+This command must be sent after the map's container is resized, or when the map is shown after being initially hidden with CSS.
+
+-}
+resize : Outgoing msg -> Id -> Cmd msg
+resize prt id =
+    makeCmd prt id "resize" []
+
+
+{-| Pans and zooms the map to contain its visible area within the specified geographical bounds. This function will also reset the map's bearing to 0 if bearing is nonzero.
+-}
+fitBounds :
+    Outgoing msg
+    -> Id
+    ->
+        List
+            (Option
+                { padding : Supported
+                , easing : Supported
+                , linear : Supported
+                , offset : Supported
+                , maxZoom : Supported
+                }
+            )
+    -> ( LngLat, LngLat )
+    -> Cmd msg
+fitBounds prt id options bounds =
+    makeCmd prt
+        id
+        "fitBounds"
+        [ ( "bounds", encodePair (encodePair Encode.float) bounds )
+        , encodeOptions options
+        ]
+
+
+{-| Options use phantom types to show which commands support them.
+-}
+type Option support
+    = Option String Value
+
+
+{-| -}
+type Supported
+    = Supported
+
+
+encodeOptions opts =
+    ( "options", Encode.object <| List.map (\(Option key val) -> ( key, val )) opts )
+
+
+{-| Pans the map by the specified offest.
+-}
+panBy :
+    Outgoing msg
+    -> Id
+    ->
+        List
+            (Option
+                { duration : Supported
+                , easing : Supported
+                , offset : Supported
+                , animate : Supported
+                }
+            )
+    -> ( Int, Int )
+    -> Cmd msg
+panBy prt id options offset =
+    makeCmd prt id "panBy" [ ( "offset", encodePair Encode.int offset ), encodeOptions options ]
+
+
+{-| Pans the map to the specified location, with an animated transition.
+-}
+panTo :
+    Outgoing msg
+    -> Id
+    ->
+        List
+            (Option
+                { duration : Supported
+                , easing : Supported
+                , offset : Supported
+                , animate : Supported
+                }
+            )
+    -> LngLat
+    -> Cmd msg
+panTo prt id options location =
+    makeCmd prt id "panTo" [ ( "location", encodePair Encode.float location ), encodeOptions options ]
+
+
+{-| Zooms the map to the specified zoom level, with an animated transition.
+-}
+zoomTo :
+    Outgoing msg
+    -> Id
+    ->
+        List
+            (Option
+                { duration : Supported
+                , easing : Supported
+                , offset : Supported
+                , animate : Supported
+                }
+            )
+    -> Float
+    -> Cmd msg
+zoomTo prt id options zm =
+    makeCmd prt id "zoomTo" [ ( "zoom", Encode.float zm ), encodeOptions options ]
+
+
+{-| Increases the map's zoom level by 1.
+-}
+zoomIn :
+    Outgoing msg
+    -> Id
+    ->
+        List
+            (Option
+                { duration : Supported
+                , easing : Supported
+                , offset : Supported
+                , animate : Supported
+                }
+            )
+    -> Cmd msg
+zoomIn prt id options =
+    makeCmd prt id "zoomIn" [ encodeOptions options ]
+
+
+{-| Decreases the map's zoom level by 1.
+-}
+zoomOut :
+    Outgoing msg
+    -> Id
+    ->
+        List
+            (Option
+                { duration : Supported
+                , easing : Supported
+                , offset : Supported
+                , animate : Supported
+                }
+            )
+    -> Cmd msg
+zoomOut prt id options =
+    makeCmd prt id "zoomOut" [ encodeOptions options ]
+
+
+{-| Rotates the map to the specified bearing, with an animated transition. The bearing is the compass direction that is "up"; for example, a bearing of 90° orients the map so that east is up.
+-}
+rotateTo :
+    Outgoing msg
+    -> Id
+    ->
+        List
+            (Option
+                { duration : Supported
+                , easing : Supported
+                , offset : Supported
+                , animate : Supported
+                }
+            )
+    -> Float
+    -> Cmd msg
+rotateTo prt id options zm =
+    makeCmd prt id "rotateTo" [ ( "bearing", Encode.float zm ), encodeOptions options ]
+
+
+{-| Changes any combination of center, zoom, bearing, and pitch, without an animated transition. The map will retain its current values for any details not specified in options.
+-}
+jumpTo :
+    Outgoing msg
+    -> Id
+    ->
+        List
+            (Option
+                { center : Supported
+                , zoom : Supported
+                , bearing : Supported
+                , pitch : Supported
+                , around : Supported
+                }
+            )
+    -> Cmd msg
+jumpTo prt id options =
+    makeCmd prt id "jumpTo" [ encodeOptions options ]
+
+
+{-| Changes any combination of center, zoom, bearing, and pitch, with an animated transition between old and new values. The map will retain its current values for any details not specified in options.
+-}
+easeTo :
+    Outgoing msg
+    -> Id
+    ->
+        List
+            (Option
+                { center : Supported
+                , zoom : Supported
+                , bearing : Supported
+                , pitch : Supported
+                , around : Supported
+                , duration : Supported
+                , easing : Supported
+                , offset : Supported
+                , animate : Supported
+                }
+            )
+    -> Cmd msg
+easeTo prt id options =
+    makeCmd prt id "easeTo" [ encodeOptions options ]
+
+
+{-| Changes any combination of center, zoom, bearing, and pitch, animating the transition along a curve that evokes flight. The animation seamlessly incorporates zooming and panning to help the user maintain her bearings even after traversing a great distance.
+-}
+flyTo :
+    Outgoing msg
+    -> Id
+    ->
+        List
+            (Option
+                { center : Supported
+                , zoom : Supported
+                , bearing : Supported
+                , pitch : Supported
+                , around : Supported
+                , duration : Supported
+                , easing : Supported
+                , offset : Supported
+                , animate : Supported
+                , curve : Supported
+                , minZoom : Supported
+                , speed : Supported
+                , screenSpeed : Supported
+                , maxDuration : Supported
+                }
+            )
+    -> Cmd msg
+flyTo prt id options =
+    makeCmd prt id "flyTo" [ encodeOptions options ]
+
+
+{-| Stops any animated transition underway.
+-}
+stop : Outgoing msg -> Id -> Cmd msg
+stop prt id =
+    makeCmd prt id "stop" []
+
+
+{-| Sets the map's [RTL text plugin](https://www.mapbox.com/mapbox-gl-js/plugins/#mapbox-gl-rtl-text). Necessary for supporting languages like Arabic and Hebrew that are written right-to-left. Takes a URL pointing to the Mapbox RTL text plugin source.
+-}
+setRTLTextPlugin : Outgoing msg -> Id -> String -> Cmd msg
+setRTLTextPlugin prt id url =
+    makeCmd prt id "setRTLTextPlugin" [ ( "url", Encode.string url ) ]
+
+
+
+-- incoming
+
+
+{-| Responds with the map's geographical bounds. Takes a numerical ID that allows you to associate the question with the answer.
+-}
+getBounds : Outgoing msg -> Id -> Int -> Cmd msg
+getBounds prt id reqId =
+    makeCmd prt id "getBounds" [ ( "requestId", Encode.int reqId ) ]
+
+
+{-| The geometry of the query region. Either a point, a bounding box (specified in terms of southwest and northeast points), or what is currently visible in the view