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camera.js
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camera.js
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// @flow
import {
bindAll,
extend,
warnOnce,
clamp,
wrap,
ease as defaultEasing,
pick,
degToRad
} from '../util/util.js';
import {number as interpolate} from '../style-spec/util/interpolate.js';
import browser from '../util/browser.js';
import LngLat from '../geo/lng_lat.js';
import LngLatBounds from '../geo/lng_lat_bounds.js';
import Point from '@mapbox/point-geometry';
import {Event, Evented} from '../util/evented.js';
import assert from 'assert';
import {Debug} from '../util/debug.js';
import MercatorCoordinate, {mercatorZfromAltitude, mercatorXfromLng, mercatorYfromLat} from '../geo/mercator_coordinate.js';
import {vec3} from 'gl-matrix';
import type {FreeCameraOptions} from './free_camera.js';
import type Transform from '../geo/transform.js';
import type {LngLatLike} from '../geo/lng_lat.js';
import type {LngLatBoundsLike} from '../geo/lng_lat_bounds.js';
import type {TaskID} from '../util/task_queue.js';
import type {Callback} from '../types/callback.js';
import type {PointLike} from '@mapbox/point-geometry';
import {Aabb, Frustum} from '../util/primitives.js';
import type {PaddingOptions} from '../geo/edge_insets.js';
import type {Vec3} from 'gl-matrix';
/**
* A helper type: converts all Object type values to non-maybe types.
*/
type Required<T> = $ObjMap<T, <V>(v: V) => $NonMaybeType<V>>;
/**
* Options common to {@link Map#jumpTo}, {@link Map#easeTo}, and {@link Map#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.
*
* @typedef {Object} CameraOptions
* @property {LngLatLike} center The desired center.
* @property {number} zoom The desired zoom level.
* @property {number} bearing The desired bearing in degrees. The bearing is the compass direction that
* is "up". For example, `bearing: 90` orients the map so that east is up.
* @property {number} pitch The desired pitch in degrees. The pitch is the angle towards the horizon
* measured in degrees with a range between 0 and 60 degrees. For example, pitch: 0 provides the appearance
* of looking straight down at the map, while pitch: 60 tilts the user's perspective towards the horizon.
* Increasing the pitch value is often used to display 3D objects.
* @property {LngLatLike} around If `zoom` is specified, `around` determines the point around which the zoom is centered.
* @property {PaddingOptions} padding Dimensions in pixels applied on each side of the viewport for shifting the vanishing point.
* @example
* // set the map's initial perspective with CameraOptions
* const map = new mapboxgl.Map({
* container: 'map',
* style: 'mapbox://styles/mapbox/streets-v11',
* center: [-73.5804, 45.53483],
* pitch: 60,
* bearing: -60,
* zoom: 10
* });
* @see [Example: Set pitch and bearing](https://docs.mapbox.com/mapbox-gl-js/example/set-perspective/)
* @see [Example: Jump to a series of locations](https://docs.mapbox.com/mapbox-gl-js/example/jump-to/)
* @see [Example: Fly to a location](https://docs.mapbox.com/mapbox-gl-js/example/flyto/)
* @see [Example: Display buildings in 3D](https://docs.mapbox.com/mapbox-gl-js/example/3d-buildings/)
*/
export type CameraOptions = {
center?: LngLatLike,
zoom?: number,
bearing?: number,
pitch?: number,
around?: LngLatLike,
padding?: PaddingOptions,
offset?: PointLike
};
export type FullCameraOptions = {
maxZoom: number,
offset: PointLike,
padding: Required<PaddingOptions>
} & CameraOptions
/**
* Options common to map movement methods that involve animation, such as {@link Map#panBy} and
* {@link Map#easeTo}, controlling the duration and easing function of the animation. All properties
* are optional.
*
* @typedef {Object} AnimationOptions
* @property {number} duration The animation's duration, measured in milliseconds.
* @property {Function} easing A function taking a time in the range 0..1 and returning a number where 0 is
* the initial state and 1 is the final state.
* @property {PointLike} offset The target center's offset relative to real map container center at the end of animation.
* @property {boolean} animate If `false`, no animation will occur.
* @property {boolean} essential If `true`, then the animation is considered essential and will not be affected by
* [`prefers-reduced-motion`](https://developer.mozilla.org/en-US/docs/Web/CSS/@media/prefers-reduced-motion).
* @see [Example: Slowly fly to a location](https://docs.mapbox.com/mapbox-gl-js/example/flyto-options/)
* @see [Example: Customize camera animations](https://docs.mapbox.com/mapbox-gl-js/example/camera-animation/)
* @see [Example: Navigate the map with game-like controls](https://docs.mapbox.com/mapbox-gl-js/example/game-controls/)
*/
export type AnimationOptions = {
duration?: number,
easing?: (_: number) => number,
offset?: PointLike,
animate?: boolean,
essential?: boolean
};
export type EasingOptions = CameraOptions & AnimationOptions;
export type ElevationBoxRaycast = {
minLngLat: LngLat,
maxLngLat: LngLat,
minAltitude: number,
maxAltitude: number
};
const freeCameraNotSupportedWarning = 'map.setFreeCameraOptions(...) and map.getFreeCameraOptions() are not yet supported for non-mercator projections.';
/**
* Options for setting padding on calls to methods such as {@link Map#fitBounds}, {@link Map#fitScreenCoordinates}, and {@link Map#setPadding}. Adjust these options to set the amount of padding in pixels added to the edges of the canvas. Set a uniform padding on all edges or individual values for each edge. All properties of this object must be
* non-negative integers.
*
* @typedef {Object} PaddingOptions
* @property {number} top Padding in pixels from the top of the map canvas.
* @property {number} bottom Padding in pixels from the bottom of the map canvas.
* @property {number} left Padding in pixels from the left of the map canvas.
* @property {number} right Padding in pixels from the right of the map canvas.
*
* @example
* const bbox = [[-79, 43], [-73, 45]];
* map.fitBounds(bbox, {
* padding: {top: 10, bottom:25, left: 15, right: 5}
* });
*
* @example
* const bbox = [[-79, 43], [-73, 45]];
* map.fitBounds(bbox, {
* padding: 20
* });
* @see [Example: Fit to the bounds of a LineString](https://docs.mapbox.com/mapbox-gl-js/example/zoomto-linestring/)
* @see [Example: Fit a map to a bounding box](https://docs.mapbox.com/mapbox-gl-js/example/fitbounds/)
*/
class Camera extends Evented {
transform: Transform;
_moving: boolean;
_zooming: boolean;
_rotating: boolean;
_pitching: boolean;
_padding: boolean;
_bearingSnap: number;
_easeStart: number;
_easeOptions: {duration: number, easing: (_: number) => number};
_easeId: string | void;
_onEaseFrame: ?(_: number) => Transform | void;
_onEaseEnd: ?(easeId?: string) => void;
_easeFrameId: ?TaskID;
+_requestRenderFrame: (() => void) => TaskID;
+_cancelRenderFrame: (_: TaskID) => void;
+_preloadTiles: (transform: Transform | Array<Transform>, callback?: Callback<any>) => any;
constructor(transform: Transform, options: {bearingSnap: number}) {
super();
this._moving = false;
this._zooming = false;
this.transform = transform;
this._bearingSnap = options.bearingSnap;
bindAll(['_renderFrameCallback'], this);
//addAssertions(this);
}
/** @section {Camera}
* @method
* @instance
* @memberof Map */
/**
* Returns the map's geographical centerpoint.
*
* @memberof Map#
* @returns {LngLat} The map's geographical centerpoint.
* @example
* // Return a LngLat object such as {lng: 0, lat: 0}.
* const center = map.getCenter();
* // Access longitude and latitude values directly.
* const {lng, lat} = map.getCenter();
* @see [Tutorial: Use Mapbox GL JS in a React app](https://docs.mapbox.com/help/tutorials/use-mapbox-gl-js-with-react/#store-the-new-coordinates)
*/
getCenter(): LngLat { return new LngLat(this.transform.center.lng, this.transform.center.lat); }
/**
* Sets the map's geographical centerpoint. Equivalent to `jumpTo({center: center})`.
*
* @memberof Map#
* @param {LngLatLike} center The centerpoint to set.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:moveend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* map.setCenter([-74, 38]);
*/
setCenter(center: LngLatLike, eventData?: Object): this {
return this.jumpTo({center}, eventData);
}
/**
* Pans the map by the specified offset.
*
* @memberof Map#
* @param {PointLike} offset The `x` and `y` coordinates by which to pan the map.
* @param {AnimationOptions | null} options An options object describing the destination and animation of the transition. We do not recommend using `options.offset` since this value will override the value of the `offset` parameter.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:moveend
* @returns {Map} `this` Returns itself to allow for method chaining.
* @example
* map.panBy([-74, 38]);
* @example
* // panBy with an animation of 5 seconds.
* map.panBy([-74, 38], {duration: 5000});
* @see [Example: Navigate the map with game-like controls](https://www.mapbox.com/mapbox-gl-js/example/game-controls/)
*/
panBy(offset: PointLike, options?: AnimationOptions, eventData?: Object): this {
offset = Point.convert(offset).mult(-1);
return this.panTo(this.transform.center, extend({offset}, options), eventData);
}
/**
* Pans the map to the specified location with an animated transition.
*
* @memberof Map#
* @param {LngLatLike} lnglat The location to pan the map to.
* @param {AnimationOptions | null} options Options describing the destination and animation of the transition.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:moveend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* map.panTo([-74, 38]);
* @example
* // Specify that the panTo animation should last 5000 milliseconds.
* map.panTo([-74, 38], {duration: 5000});
* @see [Example: Update a feature in realtime](https://docs.mapbox.com/mapbox-gl-js/example/live-update-feature/)
*/
panTo(lnglat: LngLatLike, options?: AnimationOptions, eventData?: Object): this {
return this.easeTo(extend({
center: lnglat
}, options), eventData);
}
/**
* Returns the map's current zoom level.
*
* @memberof Map#
* @returns {number} The map's current zoom level.
* @example
* map.getZoom();
*/
getZoom(): number { return this.transform.zoom; }
/**
* Sets the map's zoom level. Equivalent to `jumpTo({zoom: zoom})`.
*
* @memberof Map#
* @param {number} zoom The zoom level to set (0-20).
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:zoomstart
* @fires Map.event:move
* @fires Map.event:zoom
* @fires Map.event:moveend
* @fires Map.event:zoomend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* // Zoom to the zoom level 5 without an animated transition
* map.setZoom(5);
*/
setZoom(zoom: number, eventData?: Object): this {
this.jumpTo({zoom}, eventData);
return this;
}
/**
* Zooms the map to the specified zoom level, with an animated transition.
*
* @memberof Map#
* @param {number} zoom The zoom level to transition to.
* @param {AnimationOptions | null} options Options object.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:zoomstart
* @fires Map.event:move
* @fires Map.event:zoom
* @fires Map.event:moveend
* @fires Map.event:zoomend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* // Zoom to the zoom level 5 without an animated transition
* map.zoomTo(5);
* // Zoom to the zoom level 8 with an animated transition
* map.zoomTo(8, {
* duration: 2000,
* offset: [100, 50]
* });
*/
zoomTo(zoom: number, options: ? AnimationOptions, eventData?: Object): this {
return this.easeTo(extend({
zoom
}, options), eventData);
}
/**
* Increases the map's zoom level by 1.
*
* @memberof Map#
* @param {AnimationOptions | null} options Options object.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:zoomstart
* @fires Map.event:move
* @fires Map.event:zoom
* @fires Map.event:moveend
* @fires Map.event:zoomend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* // zoom the map in one level with a custom animation duration
* map.zoomIn({duration: 1000});
*/
zoomIn(options?: AnimationOptions, eventData?: Object): this {
this.zoomTo(this.getZoom() + 1, options, eventData);
return this;
}
/**
* Decreases the map's zoom level by 1.
*
* @memberof Map#
* @param {AnimationOptions | null} options Options object.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:zoomstart
* @fires Map.event:move
* @fires Map.event:zoom
* @fires Map.event:moveend
* @fires Map.event:zoomend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* // zoom the map out one level with a custom animation offset
* map.zoomOut({offset: [80, 60]});
*/
zoomOut(options?: AnimationOptions, eventData?: Object): this {
this.zoomTo(this.getZoom() - 1, options, eventData);
return this;
}
/**
* Returns the map's current bearing. The bearing is the compass direction that is "up"; for example, a bearing
* of 90° orients the map so that east is up.
*
* @memberof Map#
* @returns {number} The map's current bearing.
* @example
* const bearing = map.getBearing();
* @see [Example: Navigate the map with game-like controls](https://www.mapbox.com/mapbox-gl-js/example/game-controls/)
*/
getBearing(): number {
return this.transform.bearing;
}
/**
* Sets the map's bearing (rotation). The bearing is the compass direction that is "up"; for example, a bearing
* of 90° orients the map so that east is up.
*
* Equivalent to `jumpTo({bearing: bearing})`.
*
* @memberof Map#
* @param {number} bearing The desired bearing.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:moveend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* // Rotate the map to 90 degrees.
* map.setBearing(90);
*/
setBearing(bearing: number, eventData?: Object): this {
this.jumpTo({bearing}, eventData);
return this;
}
/**
* Returns the current padding applied around the map viewport.
*
* @memberof Map#
* @returns {PaddingOptions} The current padding around the map viewport.
* @example
* const padding = map.getPadding();
*/
getPadding(): PaddingOptions { return this.transform.padding; }
/**
* Sets the padding in pixels around the viewport.
*
* Equivalent to `jumpTo({padding: padding})`.
*
* @memberof Map#
* @param {PaddingOptions} padding The desired padding. Format: {left: number, right: number, top: number, bottom: number}.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:moveend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* // Sets a left padding of 300px, and a top padding of 50px
* map.setPadding({left: 300, top: 50});
*/
setPadding(padding: PaddingOptions, eventData?: Object): this {
this.jumpTo({padding}, eventData);
return this;
}
/**
* 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.
*
* @memberof Map#
* @param {number} bearing The desired bearing.
* @param {AnimationOptions | null} options Options object.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:moveend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* map.rotateTo(30);
* @example
* // rotateTo with an animation of 2 seconds.
* map.rotateTo(30, {duration: 2000});
*/
rotateTo(bearing: number, options?: AnimationOptions, eventData?: Object): this {
return this.easeTo(extend({
bearing
}, options), eventData);
}
/**
* Rotates the map so that north is up (0° bearing), with an animated transition.
*
* @memberof Map#
* @param {AnimationOptions | null} options Options object.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:moveend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* // resetNorth with an animation of 2 seconds.
* map.resetNorth({duration: 2000});
*/
resetNorth(options?: AnimationOptions, eventData?: Object): this {
this.rotateTo(0, extend({duration: 1000}, options), eventData);
return this;
}
/**
* Rotates and pitches the map so that north is up (0° bearing) and pitch is 0°, with an animated transition.
*
* @memberof Map#
* @param {AnimationOptions | null} options Options object.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:moveend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* // resetNorthPitch with an animation of 2 seconds.
* map.resetNorthPitch({duration: 2000});
*/
resetNorthPitch(options?: AnimationOptions, eventData?: Object): this {
this.easeTo(extend({
bearing: 0,
pitch: 0,
duration: 1000
}, options), eventData);
return this;
}
/**
* Snaps the map so that north is up (0° bearing), if the current bearing is
* close enough to it (within the `bearingSnap` threshold).
*
* @memberof Map#
* @param {AnimationOptions | null} options Options object.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:moveend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* // snapToNorth with an animation of 2 seconds.
* map.snapToNorth({duration: 2000});
*/
snapToNorth(options?: AnimationOptions, eventData?: Object): this {
if (Math.abs(this.getBearing()) < this._bearingSnap) {
return this.resetNorth(options, eventData);
}
return this;
}
/**
* Returns the map's current [pitch](https://docs.mapbox.com/help/glossary/camera/) (tilt).
*
* @memberof Map#
* @returns {number} The map's current pitch, measured in degrees away from the plane of the screen.
* @example
* const pitch = map.getPitch();
*/
getPitch(): number { return this.transform.pitch; }
/**
* Sets the map's [pitch](https://docs.mapbox.com/help/glossary/camera/) (tilt). Equivalent to `jumpTo({pitch: pitch})`.
*
* @memberof Map#
* @param {number} pitch The pitch to set, measured in degrees away from the plane of the screen (0-60).
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:pitchstart
* @fires Map.event:movestart
* @fires Map.event:moveend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* // setPitch with an animation of 2 seconds.
* map.setPitch(80, {duration: 2000});
*/
setPitch(pitch: number, eventData?: Object): this {
this.jumpTo({pitch}, eventData);
return this;
}
/**
* Returns a {@link CameraOptions} object for the highest zoom level
* up to and including `Map#getMaxZoom()` that fits the bounds
* in the viewport at the specified bearing.
*
* @memberof Map#
* @param {LngLatBoundsLike} bounds Calculate the center for these bounds in the viewport and use
* the highest zoom level up to and including `Map#getMaxZoom()` that fits
* in the viewport. LngLatBounds represent a box that is always axis-aligned with bearing 0.
* @param {CameraOptions | null} options Options object.
* @param {number | PaddingOptions} [options.padding] The amount of padding in pixels to add to the given bounds.
* @param {number} [options.bearing=0] Desired map bearing at end of animation, in degrees.
* @param {PointLike} [options.offset=[0, 0]] The center of the given bounds relative to the map's center, measured in pixels.
* @param {number} [options.maxZoom] The maximum zoom level to allow when the camera would transition to the specified bounds.
* @returns {CameraOptions | void} If map is able to fit to provided bounds, returns `CameraOptions` with
* `center`, `zoom`, and `bearing`. If map is unable to fit, method will warn and return undefined.
* @example
* const bbox = [[-79, 43], [-73, 45]];
* const newCameraTransform = map.cameraForBounds(bbox, {
* padding: {top: 10, bottom:25, left: 15, right: 5}
* });
*/
cameraForBounds(bounds: LngLatBoundsLike, options?: CameraOptions): ?EasingOptions {
bounds = LngLatBounds.convert(bounds);
const bearing = (options && options.bearing) || 0;
return this._cameraForBoxAndBearing(bounds.getNorthWest(), bounds.getSouthEast(), bearing, options);
}
_extendCameraOptions(options?: CameraOptions): FullCameraOptions {
const defaultPadding = {
top: 0,
bottom: 0,
right: 0,
left: 0
};
options = extend({
padding: defaultPadding,
offset: [0, 0],
maxZoom: this.transform.maxZoom
}, options);
if (typeof options.padding === 'number') {
const p = options.padding;
options.padding = {
top: p,
bottom: p,
right: p,
left: p
};
}
options.padding = extend(defaultPadding, options.padding);
return options;
}
/**
* Calculate the center of these two points in the viewport and use
* the highest zoom level up to and including `Map#getMaxZoom()` that fits
* the points in the viewport at the specified bearing.
* @memberof Map#
* @param {LngLatLike} p0 First point
* @param {LngLatLike} p1 Second point
* @param {number} bearing Desired map bearing at end of animation, in degrees
* @param {CameraOptions | null} options
* @param {number | PaddingOptions} [options.padding] The amount of padding in pixels to add to the given bounds.
* @param {PointLike} [options.offset=[0, 0]] The center of the given bounds relative to the map's center, measured in pixels.
* @param {number} [options.maxZoom] The maximum zoom level to allow when the camera would transition to the specified bounds.
* @returns {CameraOptions | void} If map is able to fit to provided bounds, returns `CameraOptions` with
* `center`, `zoom`, and `bearing`. If map is unable to fit, method will warn and return undefined.
* @private
* @example
* var p0 = [-79, 43];
* var p1 = [-73, 45];
* var bearing = 90;
* var newCameraTransform = map._cameraForBoxAndBearing(p0, p1, bearing, {
* padding: {top: 10, bottom:25, left: 15, right: 5}
* });
*/
_cameraForBoxAndBearing(p0: LngLatLike, p1: LngLatLike, bearing: number, options?: CameraOptions): ?EasingOptions {
const eOptions = this._extendCameraOptions(options);
const tr = this.transform;
const edgePadding = tr.padding;
// We want to calculate the corners of the box defined by p0 and p1 in a coordinate system
// rotated to match the destination bearing. All four corners of the box must be taken
// into account because of camera rotation.
const p0world = tr.project(LngLat.convert(p0));
const p1world = tr.project(LngLat.convert(p1));
const p2world = new Point(p0world.x, p1world.y);
const p3world = new Point(p1world.x, p0world.y);
const angleRadians = -degToRad(bearing);
const p0rotated = p0world.rotate(angleRadians);
const p1rotated = p1world.rotate(angleRadians);
const p2rotated = p2world.rotate(angleRadians);
const p3rotated = p3world.rotate(angleRadians);
const upperRight = new Point(
Math.max(p0rotated.x, p1rotated.x, p2rotated.x, p3rotated.x),
Math.max(p0rotated.y, p1rotated.y, p2rotated.y, p3rotated.y)
);
const lowerLeft = new Point(
Math.min(p0rotated.x, p1rotated.x, p2rotated.x, p3rotated.x),
Math.min(p0rotated.y, p1rotated.y, p2rotated.y, p3rotated.y)
);
// Calculate zoom: consider the original bbox and padding.
const size = upperRight.sub(lowerLeft);
const scaleX = (tr.width - ((edgePadding.left || 0) + (edgePadding.right || 0) + eOptions.padding.left + eOptions.padding.right)) / size.x;
const scaleY = (tr.height - ((edgePadding.top || 0) + (edgePadding.bottom || 0) + eOptions.padding.top + eOptions.padding.bottom)) / size.y;
if (scaleY < 0 || scaleX < 0) {
warnOnce(
'Map cannot fit within canvas with the given bounds, padding, and/or offset.'
);
return;
}
const zoom = Math.min(tr.scaleZoom(tr.scale * Math.min(scaleX, scaleY)), eOptions.maxZoom);
// Calculate center: apply the zoom, the configured offset, as well as offset that exists as a result of padding.
const offset = (typeof eOptions.offset.x === 'number' && typeof eOptions.offset.y === 'number') ?
new Point(eOptions.offset.x, eOptions.offset.y) :
Point.convert(eOptions.offset);
const paddingOffsetX = (eOptions.padding.left - eOptions.padding.right) / 2;
const paddingOffsetY = (eOptions.padding.top - eOptions.padding.bottom) / 2;
const paddingOffset = new Point(paddingOffsetX, paddingOffsetY);
const rotatedPaddingOffset = paddingOffset.rotate(bearing * Math.PI / 180);
const offsetAtInitialZoom = offset.add(rotatedPaddingOffset);
const offsetAtFinalZoom = offsetAtInitialZoom.mult(tr.scale / tr.zoomScale(zoom));
const center = tr.unproject(p0world.add(p1world).div(2).sub(offsetAtFinalZoom));
return {
center,
zoom,
bearing
};
}
/**
* Finds the best camera fit for two given viewport point coordinates.
* The method will iteratively ray march towards the target and stops
* when any of the given input points collides with the view frustum.
* @memberof Map#
* @param {LngLatLike} p0 First point
* @param {LngLatLike} p1 Second point
* @param {number} minAltitude Optional min altitude in meters
* @param {number} maxAltitude Optional max altitude in meters
* @param {CameraOptions | null} options
* @param {number | PaddingOptions} [options.padding] The amount of padding in pixels to add to the given bounds.
* @returns {CameraOptions | void} If map is able to fit to provided bounds, returns `CameraOptions` with
* `center`, `zoom`, `bearing` and `pitch`. If map is unable to fit, method will warn and return undefined.
* @private
*/
_cameraForBox(p0: LngLatLike, p1: LngLatLike, minAltitude?: number, maxAltitude?: number, options?: CameraOptions): ?EasingOptions {
const eOptions = this._extendCameraOptions(options);
minAltitude = minAltitude || 0;
maxAltitude = maxAltitude || 0;
p0 = LngLat.convert(p0);
p1 = LngLat.convert(p1);
const tr = this.transform.clone();
tr.padding = eOptions.padding;
const camera = this.getFreeCameraOptions();
const focus = new LngLat((p0.lng + p1.lng) * 0.5, (p0.lat + p1.lat) * 0.5);
const focusAltitude = (minAltitude + maxAltitude) * 0.5;
if (tr._camera.position[2] < mercatorZfromAltitude(focusAltitude, focus.lat)) {
warnOnce('Map cannot fit within canvas with the given bounds, padding, and/or offset.');
return;
}
camera.lookAtPoint(focus);
tr.setFreeCameraOptions(camera);
const coord0 = MercatorCoordinate.fromLngLat(p0);
const coord1 = MercatorCoordinate.fromLngLat(p1);
const toVec3 = (p: MercatorCoordinate): Vec3 => [p.x, p.y, p.z];
const centerIntersectionPoint = tr.pointRayIntersection(tr.centerPoint, focusAltitude);
const centerIntersectionCoord = toVec3(tr.rayIntersectionCoordinate(centerIntersectionPoint));
const centerMercatorRay = tr.screenPointToMercatorRay(tr.centerPoint);
const zInMeters = tr.projection.name !== 'globe';
const maxMarchingSteps = 10;
let steps = 0;
let halfDistanceToGround;
do {
const z = Math.floor(tr.zoom);
const z2 = 1 << z;
const minX = Math.min(z2 * coord0.x, z2 * coord1.x);
const minY = Math.min(z2 * coord0.y, z2 * coord1.y);
const maxX = Math.max(z2 * coord0.x, z2 * coord1.x);
const maxY = Math.max(z2 * coord0.y, z2 * coord1.y);
const aabb = new Aabb([minX, minY, minAltitude], [maxX, maxY, maxAltitude]);
const frustum = Frustum.fromInvProjectionMatrix(tr.invProjMatrix, tr.worldSize, z, zInMeters);
// Stop marching when frustum intersection
// reports any aabb point not fully inside
if (aabb.intersects(frustum) !== 2) {
// Went too far, step one iteration back
if (halfDistanceToGround) {
tr._camera.position = vec3.scaleAndAdd([], tr._camera.position, centerMercatorRay.dir, -halfDistanceToGround);
tr._updateStateFromCamera();
}
break;
}
const cameraPositionToGround = vec3.sub([], tr._camera.position, centerIntersectionCoord);
halfDistanceToGround = 0.5 * vec3.length(cameraPositionToGround);
// March the camera position forward by half the distance to the ground
tr._camera.position = vec3.scaleAndAdd([], tr._camera.position, centerMercatorRay.dir, halfDistanceToGround);
try {
tr._updateStateFromCamera();
} catch (e) {
warnOnce('Map cannot fit within canvas with the given bounds, padding, and/or offset.');
return;
}
} while (++steps < maxMarchingSteps);
return {
center: tr.center,
zoom: tr.zoom,
bearing: tr.bearing,
pitch: tr.pitch
};
}
/**
* 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.
* If a padding is set on the map, the bounds are fit to the inset.
*
* @memberof Map#
* @param {LngLatBoundsLike} bounds Center these bounds in the viewport and use the highest
* zoom level up to and including `Map#getMaxZoom()` that fits them in the viewport.
* @param {Object} [options] Options supports all properties from {@link AnimationOptions} and {@link CameraOptions} in addition to the fields below.
* @param {number | PaddingOptions} [options.padding] The amount of padding in pixels to add to the given bounds.
* @param {boolean} [options.linear=false] If `true`, the map transitions using
* {@link Map#easeTo}. If `false`, the map transitions using {@link Map#flyTo}. See
* those functions and {@link AnimationOptions} for information about options available.
* @param {Function} [options.easing] An easing function for the animated transition. See {@link AnimationOptions}.
* @param {PointLike} [options.offset=[0, 0]] The center of the given bounds relative to the map's center, measured in pixels.
* @param {number} [options.maxZoom] The maximum zoom level to allow when the map view transitions to the specified bounds.
* @param {Object} [eventData] Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:moveend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* const bbox = [[-79, 43], [-73, 45]];
* map.fitBounds(bbox, {
* padding: {top: 10, bottom:25, left: 15, right: 5}
* });
* @see [Example: Fit a map to a bounding box](https://www.mapbox.com/mapbox-gl-js/example/fitbounds/)
*/
fitBounds(bounds: LngLatBoundsLike, options?: EasingOptions, eventData?: Object): this {
return this._fitInternal(
this.cameraForBounds(bounds, options),
options,
eventData);
}
_raycastElevationBox(point0: Point, point1: Point): ?ElevationBoxRaycast {
const elevation = this.transform.elevation;
if (!elevation) return;
const point2 = new Point(point0.x, point1.y);
const point3 = new Point(point1.x, point0.y);
const r0 = elevation.pointCoordinate(point0);
if (!r0) return;
const r1 = elevation.pointCoordinate(point1);
if (!r1) return;
const r2 = elevation.pointCoordinate(point2);
if (!r2) return;
const r3 = elevation.pointCoordinate(point3);
if (!r3) return;
const m0 = new MercatorCoordinate(r0[0], r0[1]).toLngLat();
const m1 = new MercatorCoordinate(r1[0], r1[1]).toLngLat();
const m2 = new MercatorCoordinate(r2[0], r2[1]).toLngLat();
const m3 = new MercatorCoordinate(r3[0], r3[1]).toLngLat();
const minLng = Math.min(m0.lng, Math.min(m1.lng, Math.min(m2.lng, m3.lng)));
const minLat = Math.min(m0.lat, Math.min(m1.lat, Math.min(m2.lat, m3.lat)));
const maxLng = Math.max(m0.lng, Math.max(m1.lng, Math.max(m2.lng, m3.lng)));
const maxLat = Math.max(m0.lat, Math.max(m1.lat, Math.max(m2.lat, m3.lat)));
const minAltitude = Math.min(r0[3], Math.min(r1[3], Math.min(r2[3], r3[3])));
const maxAltitude = Math.max(r0[3], Math.max(r1[3], Math.max(r2[3], r3[3])));
const minLngLat = new LngLat(minLng, minLat);
const maxLngLat = new LngLat(maxLng, maxLat);
return {minLngLat, maxLngLat, minAltitude, maxAltitude};
}
/**
* Pans, rotates and zooms the map to to fit the box made by points p0 and p1
* once the map is rotated to the specified bearing. To zoom without rotating,
* pass in the current map bearing.
*
* @memberof Map#
* @param {PointLike} p0 First point on screen, in pixel coordinates.
* @param {PointLike} p1 Second point on screen, in pixel coordinates.
* @param {number} bearing Desired map bearing at end of animation, in degrees. This value is ignored if the map has non-zero pitch.
* @param {CameraOptions | null} options Options object.
* @param {number | PaddingOptions} [options.padding] The amount of padding in pixels to add to the given bounds.
* @param {boolean} [options.linear=false] If `true`, the map transitions using
* {@link Map#easeTo}. If `false`, the map transitions using {@link Map#flyTo}. See
* those functions and {@link AnimationOptions} for information about options available.
* @param {Function} [options.easing] An easing function for the animated transition. See {@link AnimationOptions}.
* @param {PointLike} [options.offset=[0, 0]] The center of the given bounds relative to the map's center, measured in pixels.
* @param {number} [options.maxZoom] The maximum zoom level to allow when the map view transitions to the specified bounds.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:moveend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* const p0 = [220, 400];
* const p1 = [500, 900];
* map.fitScreenCoordinates(p0, p1, map.getBearing(), {
* padding: {top: 10, bottom:25, left: 15, right: 5}
* });
* @see Used by {@link BoxZoomHandler}
*/
fitScreenCoordinates(p0: PointLike, p1: PointLike, bearing: number, options?: EasingOptions, eventData?: Object): this {
let lngLat0, lngLat1, minAltitude, maxAltitude;
const point0 = Point.convert(p0);
const point1 = Point.convert(p1);
const raycast = this._raycastElevationBox(point0, point1);
if (!raycast) {
if (this.transform.anyCornerOffEdge(point0, point1)) {
return this;
}
lngLat0 = this.transform.pointLocation(point0);
lngLat1 = this.transform.pointLocation(point1);
} else {
lngLat0 = raycast.minLngLat;
lngLat1 = raycast.maxLngLat;
minAltitude = raycast.minAltitude;
maxAltitude = raycast.maxAltitude;
}
if (this.transform.pitch === 0) {
return this._fitInternal(
this._cameraForBoxAndBearing(
this.transform.pointLocation(Point.convert(p0)),
this.transform.pointLocation(Point.convert(p1)),
bearing,
options),
options,
eventData);
}
return this._fitInternal(
this._cameraForBox(
lngLat0,
lngLat1,
minAltitude,
maxAltitude,
options),
options, eventData);
}
_fitInternal(calculatedOptions?: ?EasingOptions, options?: EasingOptions, eventData?: Object): this {
// cameraForBounds warns + returns undefined if unable to fit:
if (!calculatedOptions) return this;
options = extend(calculatedOptions, options);
// Explicitly remove the padding field because, calculatedOptions already accounts for padding by setting zoom and center accordingly.
delete options.padding;
return options.linear ?
this.easeTo(options, eventData) :
this.flyTo(options, eventData);
}
/**
* 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`.
*
* @memberof Map#
* @param {CameraOptions} options Options object.
* @param {Object | null} eventData Additional properties to be added to event objects of events triggered by this method.
* @fires Map.event:movestart
* @fires Map.event:zoomstart
* @fires Map.event:pitchstart
* @fires Map.event:rotate
* @fires Map.event:move
* @fires Map.event:zoom
* @fires Map.event:pitch
* @fires Map.event:moveend
* @fires Map.event:zoomend
* @fires Map.event:pitchend
* @returns {Map} Returns itself to allow for method chaining.
* @example
* // jump to coordinates at current zoom
* map.jumpTo({center: [0, 0]});
* // jump with zoom, pitch, and bearing options
* map.jumpTo({
* center: [0, 0],
* zoom: 8,
* pitch: 45,
* bearing: 90
* });
* @see [Example: Jump to a series of locations](https://docs.mapbox.com/mapbox-gl-js/example/jump-to/)
* @see [Example: Update a feature in realtime](https://docs.mapbox.com/mapbox-gl-js/example/live-update-feature/)
*/
jumpTo(options: CameraOptions & {preloadOnly?: boolean}, eventData?: Object): this {
this.stop();
const tr = options.preloadOnly ? this.transform.clone() : this.transform;
let zoomChanged = false,
bearingChanged = false,
pitchChanged = false;
if ('zoom' in options && tr.zoom !== +options.zoom) {
zoomChanged = true;
tr.zoom = +options.zoom;
}
if (options.center !== undefined) {
tr.center = LngLat.convert(options.center);
}
if ('bearing' in options && tr.bearing !== +options.bearing) {
bearingChanged = true;
tr.bearing = +options.bearing;
}
if ('pitch' in options && tr.pitch !== +options.pitch) {
pitchChanged = true;
tr.pitch = +options.pitch;
}
if (options.padding != null && !tr.isPaddingEqual(options.padding)) {
tr.padding = options.padding;
}
if (options.preloadOnly) {