mapbox-gl
Version:
A WebGL interactive maps library
1,091 lines (972 loc) • 42.6 kB
JavaScript
// @flow
import {
bindAll,
extend,
deepEqual,
warnOnce,
clamp,
wrap,
ease as defaultEasing,
pick
} from '../util/util';
import { number as interpolate } from '../style-spec/util/interpolate';
import browser from '../util/browser';
import LngLat from '../geo/lng_lat';
import LngLatBounds from '../geo/lng_lat_bounds';
import Point from '@mapbox/point-geometry';
import { Event, Evented } from '../util/evented';
import type Transform from '../geo/transform';
import type {LngLatLike} from '../geo/lng_lat';
import type {LngLatBoundsLike} from '../geo/lng_lat_bounds';
import type {TaskID} from '../util/task_queue';
import type {PointLike} from '@mapbox/point-geometry';
/**
* 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, a bearing of 90° orients the map so that east is up.
* @property {number} pitch The desired pitch, in degrees.
* @property {LngLatLike} around If `zoom` is specified, `around` determines the point around which the zoom is centered.
*/
export type CameraOptions = {
center?: LngLatLike,
zoom?: number,
bearing?: number,
pitch?: number,
around?: LngLatLike
};
/**
* 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 of the target center relative to real map container center at the end of animation.
* @property {boolean} animate If `false`, no animation will occur.
*/
export type AnimationOptions = {
duration?: number,
easing?: (number) => number,
offset?: PointLike,
animate?: boolean
};
/**
* Options for setting padding on a call to {@link Map#fitBounds}. 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.
*/
class Camera extends Evented {
transform: Transform;
_moving: boolean;
_zooming: boolean;
_rotating: boolean;
_pitching: boolean;
_bearingSnap: number;
_easeEndTimeoutID: TimeoutID;
_easeStart: number;
_easeOptions: {duration: number, easing: (number) => number};
_onEaseFrame: (number) => void;
_onEaseEnd: () => void;
_easeFrameId: ?TaskID;
+_requestRenderFrame: (() => void) => TaskID;
+_cancelRenderFrame: (TaskID) => void;
constructor(transform: Transform, options: {bearingSnap: number}) {
super();
this._moving = false;
this._zooming = false;
this.transform = transform;
this._bearingSnap = options.bearingSnap;
bindAll(['_renderFrameCallback'], this);
}
/**
* Returns the map's geographical centerpoint.
*
* @memberof Map#
* @returns The map's geographical centerpoint.
*/
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 center The centerpoint to set.
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires moveend
* @returns {Map} `this`
* @example
* map.setCenter([-74, 38]);
*/
setCenter(center: LngLatLike, eventData?: Object) {
return this.jumpTo({center}, eventData);
}
/**
* Pans the map by the specified offset.
*
* @memberof Map#
* @param offset `x` and `y` coordinates by which to pan the map.
* @param options
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires moveend
* @returns {Map} `this`
* @see [Navigate the map with game-like controls](https://www.mapbox.com/mapbox-gl-js/example/game-controls/)
*/
panBy(offset: PointLike, options?: AnimationOptions, eventData?: Object) {
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 lnglat The location to pan the map to.
* @param options
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires moveend
* @returns {Map} `this`
*/
panTo(lnglat: LngLatLike, options?: AnimationOptions, eventData?: Object) {
return this.easeTo(extend({
center: lnglat
}, options), eventData);
}
/**
* Returns the map's current zoom level.
*
* @memberof Map#
* @returns The map's current zoom level.
*/
getZoom(): number { return this.transform.zoom; }
/**
* Sets the map's zoom level. Equivalent to `jumpTo({zoom: zoom})`.
*
* @memberof Map#
* @param zoom The zoom level to set (0-20).
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires zoomstart
* @fires move
* @fires zoom
* @fires moveend
* @fires zoomend
* @returns {Map} `this`
* @example
* // zoom the map to 5
* map.setZoom(5);
*/
setZoom(zoom: number, eventData?: Object) {
this.jumpTo({zoom}, eventData);
return this;
}
/**
* Zooms the map to the specified zoom level, with an animated transition.
*
* @memberof Map#
* @param zoom The zoom level to transition to.
* @param options
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires zoomstart
* @fires move
* @fires zoom
* @fires moveend
* @fires zoomend
* @returns {Map} `this`
*/
zoomTo(zoom: number, options: ? AnimationOptions, eventData?: Object) {
return this.easeTo(extend({
zoom
}, options), eventData);
}
/**
* Increases the map's zoom level by 1.
*
* @memberof Map#
* @param options
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires zoomstart
* @fires move
* @fires zoom
* @fires moveend
* @fires zoomend
* @returns {Map} `this`
*/
zoomIn(options?: AnimationOptions, eventData?: Object) {
this.zoomTo(this.getZoom() + 1, options, eventData);
return this;
}
/**
* Decreases the map's zoom level by 1.
*
* @memberof Map#
* @param options
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires zoomstart
* @fires move
* @fires zoom
* @fires moveend
* @fires zoomend
* @returns {Map} `this`
*/
zoomOut(options?: AnimationOptions, eventData?: Object) {
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 The map's current bearing.
* @see [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 bearing The desired bearing.
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires moveend
* @returns {Map} `this`
* @example
* // rotate the map to 90 degrees
* map.setBearing(90);
*/
setBearing(bearing: number, eventData?: Object) {
this.jumpTo({bearing}, 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 bearing The desired bearing.
* @param options
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires moveend
* @returns {Map} `this`
*/
rotateTo(bearing: number, options?: AnimationOptions, eventData?: Object) {
return this.easeTo(extend({
bearing
}, options), eventData);
}
/**
* Rotates the map so that north is up (0° bearing), with an animated transition.
*
* @memberof Map#
* @param options
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires moveend
* @returns {Map} `this`
*/
resetNorth(options?: AnimationOptions, eventData?: Object) {
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 options
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires moveend
* @returns {Map} `this`
*/
resetNorthPitch(options?: AnimationOptions, eventData?: Object) {
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 (i.e. within the
* `bearingSnap` threshold).
*
* @memberof Map#
* @param options
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires moveend
* @returns {Map} `this`
*/
snapToNorth(options?: AnimationOptions, eventData?: Object) {
if (Math.abs(this.getBearing()) < this._bearingSnap) {
return this.resetNorth(options, eventData);
}
return this;
}
/**
* Returns the map's current pitch (tilt).
*
* @memberof Map#
* @returns The map's current pitch, measured in degrees away from the plane of the screen.
*/
getPitch(): number { return this.transform.pitch; }
/**
* Sets the map's pitch (tilt). Equivalent to `jumpTo({pitch: pitch})`.
*
* @memberof Map#
* @param pitch The pitch to set, measured in degrees away from the plane of the screen (0-60).
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires pitchstart
* @fires movestart
* @fires moveend
* @returns {Map} `this`
*/
setPitch(pitch: number, eventData?: Object) {
this.jumpTo({pitch}, eventData);
return this;
}
/**
* @memberof Map#
* @param {LatLngBoundsLike} 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. LatLngBounds represent a box that is always axis-aligned with bearing 0.
* @param 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.
* @example
* var bbox = [[-79, 43], [-73, 45]];
* var newCameraTransform = map.cameraForBounds(bbox, {
* padding: {top: 10, bottom:25, left: 15, right: 5}
* });
*/
cameraForBounds(bounds: LngLatBoundsLike, options?: CameraOptions): void | CameraOptions & AnimationOptions {
bounds = LngLatBounds.convert(bounds);
return this._cameraForBoxAndBearing(bounds.getNorthWest(), bounds.getSouthEast(), 0, 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 bearing Desired map bearing at end of animation, in degrees
* @param 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): void | CameraOptions & AnimationOptions {
options = extend({
padding: {
top: 0,
bottom: 0,
right: 0,
left: 0
},
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
};
}
if (!deepEqual(Object.keys(options.padding).sort((a, b) => {
if (a < b) return -1;
if (a > b) return 1;
return 0;
}), ["bottom", "left", "right", "top"])) {
warnOnce(
"options.padding must be a positive number, or an Object with keys 'bottom', 'left', 'right', 'top'"
);
return;
}
const tr = this.transform;
// We want to calculate the upper right and lower left of the box defined by p0 and p1
// in a coordinate system rotate to match the destination bearing.
const p0world = tr.project(LngLat.convert(p0));
const p1world = tr.project(LngLat.convert(p1));
const p0rotated = p0world.rotate(-bearing * Math.PI / 180);
const p1rotated = p1world.rotate(-bearing * Math.PI / 180);
const upperRight = new Point(Math.max(p0rotated.x, p1rotated.x), Math.max(p0rotated.y, p1rotated.y));
const lowerLeft = new Point(Math.min(p0rotated.x, p1rotated.x), Math.min(p0rotated.y, p1rotated.y));
// Calculate zoom: consider the original bbox and padding.
const size = upperRight.sub(lowerLeft);
const scaleX = (tr.width - options.padding.left - options.padding.right) / size.x;
const scaleY = (tr.height - options.padding.top - options.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)), options.maxZoom);
// Calculate center: apply the zoom, the configured offset, as well as offset that exists as a result of padding.
const offset = Point.convert(options.offset);
const paddingOffsetX = (options.padding.left - options.padding.right) / 2;
const paddingOffsetY = (options.padding.top - options.padding.bottom) / 2;
const offsetAtInitialZoom = new Point(offset.x + paddingOffsetX, offset.y + paddingOffsetY);
const offsetAtFinalZoom = offsetAtInitialZoom.mult(tr.scale / tr.zoomScale(zoom));
const center = tr.unproject(p0world.add(p1world).div(2).sub(offsetAtFinalZoom));
return {
center,
zoom,
bearing
};
}
/**
* 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.
*
* @memberof Map#
* @param 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 movestart
* @fires moveend
* @returns {Map} `this`
* @example
* var bbox = [[-79, 43], [-73, 45]];
* map.fitBounds(bbox, {
* padding: {top: 10, bottom:25, left: 15, right: 5}
* });
* @see [Fit a map to a bounding box](https://www.mapbox.com/mapbox-gl-js/example/fitbounds/)
*/
fitBounds(bounds: LngLatBoundsLike, options?: AnimationOptions & CameraOptions, eventData?: Object) {
return this._fitInternal(
this.cameraForBounds(bounds, options),
options,
eventData);
}
/**
* 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 p0 First point on screen, in pixel coordinates
* @param p1 Second point on screen, in pixel coordinates
* @param bearing Desired map bearing at end of animation, in degrees
* @param options
* @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 eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires moveend
* @returns {Map} `this`
* @example
* var p0 = [220, 400];
* var p1 = [500, 900];
* map.fitScreenCoordinates(p0, p1, map.getBearing(), {
* padding: {top: 10, bottom:25, left: 15, right: 5}
* });
* @see [Used by BoxZoomHandler](https://www.mapbox.com/mapbox-gl-js/api/#boxzoomhandler)
*/
fitScreenCoordinates(p0: PointLike, p1: PointLike, bearing: number, options?: AnimationOptions & CameraOptions, eventData?: Object) {
return this._fitInternal(
this._cameraForBoxAndBearing(
this.transform.pointLocation(Point.convert(p0)),
this.transform.pointLocation(Point.convert(p1)),
bearing,
options),
options,
eventData);
}
_fitInternal(calculatedOptions?: CameraOptions & AnimationOptions, options?: AnimationOptions & CameraOptions, eventData?: Object) {
// cameraForBounds warns + returns undefined if unable to fit:
if (!calculatedOptions) return this;
options = extend(calculatedOptions, options);
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 options
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires zoomstart
* @fires pitchstart
* @fires rotate
* @fires move
* @fires zoom
* @fires pitch
* @fires moveend
* @fires zoomend
* @fires pitchend
* @returns {Map} `this`
*/
jumpTo(options: CameraOptions, eventData?: Object) {
this.stop();
const tr = 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;
}
this.fire(new Event('movestart', eventData))
.fire(new Event('move', eventData));
if (zoomChanged) {
this.fire(new Event('zoomstart', eventData))
.fire(new Event('zoom', eventData))
.fire(new Event('zoomend', eventData));
}
if (bearingChanged) {
this.fire(new Event('rotatestart', eventData))
.fire(new Event('rotate', eventData))
.fire(new Event('rotateend', eventData));
}
if (pitchChanged) {
this.fire(new Event('pitchstart', eventData))
.fire(new Event('pitch', eventData))
.fire(new Event('pitchend', eventData));
}
return this.fire(new Event('moveend', eventData));
}
/**
* 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`.
*
* Note: The transition will happen instantly if the user has enabled
* the `reduced motion` accesibility feature enabled in their operating system.
*
* @memberof Map#
* @param options Options describing the destination and animation of the transition.
* Accepts {@link CameraOptions} and {@link AnimationOptions}.
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires zoomstart
* @fires pitchstart
* @fires rotate
* @fires move
* @fires zoom
* @fires pitch
* @fires moveend
* @fires zoomend
* @fires pitchend
* @returns {Map} `this`
* @see [Navigate the map with game-like controls](https://www.mapbox.com/mapbox-gl-js/example/game-controls/)
*/
easeTo(options: CameraOptions & AnimationOptions & {delayEndEvents?: number}, eventData?: Object) {
this.stop();
options = extend({
offset: [0, 0],
duration: 500,
easing: defaultEasing
}, options);
if (options.animate === false || browser.prefersReducedMotion) options.duration = 0;
const tr = this.transform,
startZoom = this.getZoom(),
startBearing = this.getBearing(),
startPitch = this.getPitch(),
zoom = 'zoom' in options ? +options.zoom : startZoom,
bearing = 'bearing' in options ? this._normalizeBearing(options.bearing, startBearing) : startBearing,
pitch = 'pitch' in options ? +options.pitch : startPitch;
const pointAtOffset = tr.centerPoint.add(Point.convert(options.offset));
const locationAtOffset = tr.pointLocation(pointAtOffset);
const center = LngLat.convert(options.center || locationAtOffset);
this._normalizeCenter(center);
const from = tr.project(locationAtOffset);
const delta = tr.project(center).sub(from);
const finalScale = tr.zoomScale(zoom - startZoom);
let around, aroundPoint;
if (options.around) {
around = LngLat.convert(options.around);
aroundPoint = tr.locationPoint(around);
}
this._zooming = (zoom !== startZoom);
this._rotating = (startBearing !== bearing);
this._pitching = (pitch !== startPitch);
this._prepareEase(eventData, options.noMoveStart);
clearTimeout(this._easeEndTimeoutID);
this._ease((k) => {
if (this._zooming) {
tr.zoom = interpolate(startZoom, zoom, k);
}
if (this._rotating) {
tr.bearing = interpolate(startBearing, bearing, k);
}
if (this._pitching) {
tr.pitch = interpolate(startPitch, pitch, k);
}
if (around) {
tr.setLocationAtPoint(around, aroundPoint);
} else {
const scale = tr.zoomScale(tr.zoom - startZoom);
const base = zoom > startZoom ?
Math.min(2, finalScale) :
Math.max(0.5, finalScale);
const speedup = Math.pow(base, 1 - k);
const newCenter = tr.unproject(from.add(delta.mult(k * speedup)).mult(scale));
tr.setLocationAtPoint(tr.renderWorldCopies ? newCenter.wrap() : newCenter, pointAtOffset);
}
this._fireMoveEvents(eventData);
}, () => {
if (options.delayEndEvents) {
this._easeEndTimeoutID = setTimeout(() => this._afterEase(eventData), options.delayEndEvents);
} else {
this._afterEase(eventData);
}
}, options);
return this;
}
_prepareEase(eventData?: Object, noMoveStart: boolean) {
this._moving = true;
if (!noMoveStart) {
this.fire(new Event('movestart', eventData));
}
if (this._zooming) {
this.fire(new Event('zoomstart', eventData));
}
if (this._rotating) {
this.fire(new Event('rotatestart', eventData));
}
if (this._pitching) {
this.fire(new Event('pitchstart', eventData));
}
}
_fireMoveEvents(eventData?: Object) {
this.fire(new Event('move', eventData));
if (this._zooming) {
this.fire(new Event('zoom', eventData));
}
if (this._rotating) {
this.fire(new Event('rotate', eventData));
}
if (this._pitching) {
this.fire(new Event('pitch', eventData));
}
}
_afterEase(eventData?: Object) {
const wasZooming = this._zooming;
const wasRotating = this._rotating;
const wasPitching = this._pitching;
this._moving = false;
this._zooming = false;
this._rotating = false;
this._pitching = false;
if (wasZooming) {
this.fire(new Event('zoomend', eventData));
}
if (wasRotating) {
this.fire(new Event('rotateend', eventData));
}
if (wasPitching) {
this.fire(new Event('pitchend', eventData));
}
this.fire(new Event('moveend', eventData));
}
/**
* 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.
*
* Note: The animation will be skipped, and this will behave equivalently to `jumpTo`
* if the user has the `reduced motion` accesibility feature enabled in their operating system.
*
* @memberof Map#
* @param {Object} options Options describing the destination and animation of the transition.
* Accepts {@link CameraOptions}, {@link AnimationOptions},
* and the following additional options.
* @param {number} [options.curve=1.42] 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 {@link Map#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
* `Math.pow(6, 0.25)` would be equivalent to the root mean squared average velocity. A
* value of 1 would produce a circular motion.
* @param {number} [options.minZoom] The zero-based zoom level at the peak of the flight path. If
* `options.curve` is specified, this option is ignored.
* @param {number} [options.speed=1.2] The average speed of the animation defined in relation to
* `options.curve`. A speed of 1.2 means that the map appears to move along the flight path
* by 1.2 times `options.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.
* @param {number} [options.screenSpeed] The average speed of the animation measured in screenfuls
* per second, assuming a linear timing curve. If `options.speed` is specified, this option is ignored.
* @param {number} [options.maxDuration] The animation's maximum duration, measured in milliseconds.
* If duration exceeds maximum duration, it resets to 0.
* @param eventData Additional properties to be added to event objects of events triggered by this method.
* @fires movestart
* @fires zoomstart
* @fires pitchstart
* @fires move
* @fires zoom
* @fires rotate
* @fires pitch
* @fires moveend
* @fires zoomend
* @fires pitchend
* @returns {Map} `this`
* @example
* // fly with default options to null island
* map.flyTo({center: [0, 0], zoom: 9});
* // using flyTo options
* map.flyTo({
* center: [0, 0],
* zoom: 9,
* speed: 0.2,
* curve: 1,
* easing(t) {
* return t;
* }
* });
* @see [Fly to a location](https://www.mapbox.com/mapbox-gl-js/example/flyto/)
* @see [Slowly fly to a location](https://www.mapbox.com/mapbox-gl-js/example/flyto-options/)
* @see [Fly to a location based on scroll position](https://www.mapbox.com/mapbox-gl-js/example/scroll-fly-to/)
*/
flyTo(options: Object, eventData?: Object) {
// Fall through to jumpTo if user has set prefers-reduced-motion
if (browser.prefersReducedMotion) {
const coercedOptions = (pick(options, ['center', 'zoom', 'bearing', 'pitch', 'around']): CameraOptions);
return this.jumpTo(coercedOptions, eventData);
}
// This method implements an “optimal path” animation, as detailed in:
//
// Van Wijk, Jarke J.; Nuij, Wim A. A. “Smooth and efficient zooming and panning.” INFOVIS
// ’03. pp. 15–22. <https://www.win.tue.nl/~vanwijk/zoompan.pdf#page=5>.
//
// Where applicable, local variable documentation begins with the associated variable or
// function in van Wijk (2003).
this.stop();
options = extend({
offset: [0, 0],
speed: 1.2,
curve: 1.42,
easing: defaultEasing
}, options);
const tr = this.transform,
startZoom = this.getZoom(),
startBearing = this.getBearing(),
startPitch = this.getPitch();
const zoom = 'zoom' in options ? clamp(+options.zoom, tr.minZoom, tr.maxZoom) : startZoom;
const bearing = 'bearing' in options ? this._normalizeBearing(options.bearing, startBearing) : startBearing;
const pitch = 'pitch' in options ? +options.pitch : startPitch;
const scale = tr.zoomScale(zoom - startZoom);
const pointAtOffset = tr.centerPoint.add(Point.convert(options.offset));
const locationAtOffset = tr.pointLocation(pointAtOffset);
const center = LngLat.convert(options.center || locationAtOffset);
this._normalizeCenter(center);
const from = tr.project(locationAtOffset);
const delta = tr.project(center).sub(from);
let rho = options.curve;
// w₀: Initial visible span, measured in pixels at the initial scale.
const w0 = Math.max(tr.width, tr.height),
// w₁: Final visible span, measured in pixels with respect to the initial scale.
w1 = w0 / scale,
// Length of the flight path as projected onto the ground plane, measured in pixels from
// the world image origin at the initial scale.
u1 = delta.mag();
if ('minZoom' in options) {
const minZoom = clamp(Math.min(options.minZoom, startZoom, zoom), tr.minZoom, tr.maxZoom);
// w<sub>m</sub>: Maximum visible span, measured in pixels with respect to the initial
// scale.
const wMax = w0 / tr.zoomScale(minZoom - startZoom);
rho = Math.sqrt(wMax / u1 * 2);
}
// ρ²
const rho2 = rho * rho;
/**
* rᵢ: Returns the zoom-out factor at one end of the animation.
*
* @param i 0 for the ascent or 1 for the descent.
* @private
*/
function r(i) {
const b = (w1 * w1 - w0 * w0 + (i ? -1 : 1) * rho2 * rho2 * u1 * u1) / (2 * (i ? w1 : w0) * rho2 * u1);
return Math.log(Math.sqrt(b * b + 1) - b);
}
function sinh(n) { return (Math.exp(n) - Math.exp(-n)) / 2; }
function cosh(n) { return (Math.exp(n) + Math.exp(-n)) / 2; }
function tanh(n) { return sinh(n) / cosh(n); }
// r₀: Zoom-out factor during ascent.
const r0 = r(0);
// w(s): Returns the visible span on the ground, measured in pixels with respect to the
// initial scale. Assumes an angular field of view of 2 arctan ½ ≈ 53°.
let w: (number) => number = function (s) {
return (cosh(r0) / cosh(r0 + rho * s));
};
// u(s): Returns the distance along the flight path as projected onto the ground plane,
// measured in pixels from the world image origin at the initial scale.
let u: (number) => number = function (s) {
return w0 * ((cosh(r0) * tanh(r0 + rho * s) - sinh(r0)) / rho2) / u1;
};
// S: Total length of the flight path, measured in ρ-screenfuls.
let S = (r(1) - r0) / rho;
// When u₀ = u₁, the optimal path doesn’t require both ascent and descent.
if (Math.abs(u1) < 0.000001 || !isFinite(S)) {
// Perform a more or less instantaneous transition if the path is too short.
if (Math.abs(w0 - w1) < 0.000001) return this.easeTo(options, eventData);
const k = w1 < w0 ? -1 : 1;
S = Math.abs(Math.log(w1 / w0)) / rho;
u = function() { return 0; };
w = function(s) { return Math.exp(k * rho * s); };
}
if ('duration' in options) {
options.duration = +options.duration;
} else {
const V = 'screenSpeed' in options ? +options.screenSpeed / rho : +options.speed;
options.duration = 1000 * S / V;
}
if (options.maxDuration && options.duration > options.maxDuration) {
options.duration = 0;
}
this._zooming = true;
this._rotating = (startBearing !== bearing);
this._pitching = (pitch !== startPitch);
this._prepareEase(eventData, false);
this._ease((k) => {
// s: The distance traveled along the flight path, measured in ρ-screenfuls.
const s = k * S;
const scale = 1 / w(s);
tr.zoom = k === 1 ? zoom : startZoom + tr.scaleZoom(scale);
if (this._rotating) {
tr.bearing = interpolate(startBearing, bearing, k);
}
if (this._pitching) {
tr.pitch = interpolate(startPitch, pitch, k);
}
const newCenter = k === 1 ? center : tr.unproject(from.add(delta.mult(u(s))).mult(scale));
tr.setLocationAtPoint(tr.renderWorldCopies ? newCenter.wrap() : newCenter, pointAtOffset);
this._fireMoveEvents(eventData);
}, () => this._afterEase(eventData), options);
return this;
}
isEasing() {
return !!this._easeFrameId;
}
/**
* Stops any animated transition underway.
*
* @memberof Map#
* @returns {Map} `this`
*/
stop(): this {
if (this._easeFrameId) {
this._cancelRenderFrame(this._easeFrameId);
delete this._easeFrameId;
delete this._onEaseFrame;
}
if (this._onEaseEnd) {
// The _onEaseEnd function might emit events which trigger new
// animation, which sets a new _onEaseEnd. Ensure we don't delete
// it unintentionally.
const onEaseEnd = this._onEaseEnd;
delete this._onEaseEnd;
onEaseEnd.call(this);
}
return this;
}
_ease(frame: (number) => void,
finish: () => void,
options: {animate: boolean, duration: number, easing: (number) => number}) {
if (options.animate === false || options.duration === 0) {
frame(1);
finish();
} else {
this._easeStart = browser.now();
this._easeOptions = options;
this._onEaseFrame = frame;
this._onEaseEnd = finish;
this._easeFrameId = this._requestRenderFrame(this._renderFrameCallback);
}
}
// Callback for map._requestRenderFrame
_renderFrameCallback() {
const t = Math.min((browser.now() - this._easeStart) / this._easeOptions.duration, 1);
this._onEaseFrame(this._easeOptions.easing(t));
if (t < 1) {
this._easeFrameId = this._requestRenderFrame(this._renderFrameCallback);
} else {
this.stop();
}
}
// convert bearing so that it's numerically close to the current one so that it interpolates properly
_normalizeBearing(bearing: number, currentBearing: number) {
bearing = wrap(bearing, -180, 180);
const diff = Math.abs(bearing - currentBearing);
if (Math.abs(bearing - 360 - currentBearing) < diff) bearing -= 360;
if (Math.abs(bearing + 360 - currentBearing) < diff) bearing += 360;
return bearing;
}
// If a path crossing the antimeridian would be shorter, extend the final coordinate so that
// interpolating between the two endpoints will cross it.
_normalizeCenter(center: LngLat) {
const tr = this.transform;
if (!tr.renderWorldCopies || tr.lngRange) return;
const delta = center.lng - tr.center.lng;
center.lng +=
delta > 180 ? -360 :
delta < -180 ? 360 : 0;
}
}
export default Camera;