com.mapbox.mapboxsdk.camera.CameraUpdateFactory Maven / Gradle / Ivy
package com.mapbox.mapboxsdk.camera;
import android.graphics.Point;
import android.graphics.PointF;
import android.graphics.RectF;
import android.support.annotation.IntDef;
import android.support.annotation.NonNull;
import com.mapbox.mapboxsdk.geometry.LatLng;
import com.mapbox.mapboxsdk.geometry.LatLngBounds;
import com.mapbox.mapboxsdk.maps.MapboxMap;
import com.mapbox.mapboxsdk.maps.Projection;
import com.mapbox.mapboxsdk.maps.UiSettings;
import com.mapbox.services.android.telemetry.utils.MathUtils;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
/**
* Factory for creating {@link CameraUpdate} objects.
*/
public final class CameraUpdateFactory {
/**
* Returns a CameraUpdate that moves the camera to a specified CameraPosition.
*
* @param cameraPosition Camera Position to change to
* @return CameraUpdate Final Camera Position
*/
public static CameraUpdate newCameraPosition(@NonNull CameraPosition cameraPosition) {
return new CameraPositionUpdate(cameraPosition.bearing, cameraPosition.target, cameraPosition.tilt,
cameraPosition.zoom);
}
/**
* Returns a CameraUpdate that moves the center of the screen to a latitude and longitude
* specified by a LatLng object. This centers the camera on the LatLng object.
*
* @param latLng Target location to change to
* @return CameraUpdate Final Camera Position
*/
public static CameraUpdate newLatLng(@NonNull LatLng latLng) {
return new CameraPositionUpdate(-1, latLng, -1, -1);
}
/**
* Returns a {@link CameraUpdate} that transforms the camera such that the specified
* latitude/longitude bounds are centered on screen at the greatest possible zoom level.
* You can specify padding, in order to inset the bounding box from the map view's edges.
* The returned CameraUpdate has a bearing of 0 and a tilt of 0.
*
* @param bounds Bounds to match Camera position with
* @param padding Padding added to the bounds
* @return CameraUpdate Final Camera Position
*/
public static CameraUpdate newLatLngBounds(@NonNull LatLngBounds bounds, int padding) {
return newLatLngBounds(bounds, padding, padding, padding, padding);
}
/**
* Returns a {@link CameraUpdate} that transforms the camera such that the specified
* latitude/longitude bounds are centered on screen at the greatest possible zoom level.
* You can specify padding, in order to inset the bounding box from the map view's edges.
* The returned CameraUpdate has a bearing of 0 and a tilt of 0.
*
* @param bounds Bounds to base the Camera position out of
* @param paddingLeft Padding left of the bounds
* @param paddingTop Padding top of the bounds
* @param paddingRight Padding right of the bounds
* @param paddingBottom Padding bottom of the bounds
* @return CameraUpdate Final Camera Position
*/
public static CameraUpdate newLatLngBounds(@NonNull LatLngBounds bounds, int paddingLeft, int paddingTop,
int paddingRight, int paddingBottom) {
return new CameraBoundsUpdate(bounds, paddingLeft, paddingTop, paddingRight, paddingBottom);
}
/**
* Returns a CameraUpdate that moves the center of the screen to a latitude and longitude
* specified by a LatLng object, and moves to the given zoom level.
*
* @param latLng Target location to change to
* @param zoom Zoom level to change to
* @return CameraUpdate Final Camera Position
*/
public static CameraUpdate newLatLngZoom(@NonNull LatLng latLng, double zoom) {
return new CameraPositionUpdate(-1, latLng, -1, zoom);
}
/**
* Returns a CameraUpdate that scrolls the camera over the map,
* shifting the center of view by the specified number of pixels in the x and y directions.
*
* @param xPixel Amount of pixels to scroll to in x direction
* @param yPixel Amount of pixels to scroll to in y direction
* @return CameraUpdate Final Camera Position
*/
public static CameraUpdate scrollBy(float xPixel, float yPixel) {
return new CameraMoveUpdate(xPixel, yPixel);
}
/**
* Returns a CameraUpdate that shifts the zoom level of the current camera viewpoint.
*
* @param amount Amount of zoom level to change with
* @param focus Focus point of zoom
* @return CameraUpdate Final Camera Position
*/
public static CameraUpdate zoomBy(double amount, Point focus) {
return new ZoomUpdate(amount, focus.x, focus.y);
}
/**
* Returns a CameraUpdate that shifts the zoom level of the current camera viewpoint.
*
* @param amount Amount of zoom level to change with
* @return CameraUpdate Final Camera Position
*/
public static CameraUpdate zoomBy(double amount) {
return new ZoomUpdate(ZoomUpdate.ZOOM_BY, amount);
}
/**
* Returns a CameraUpdate that zooms in on the map by moving the viewpoint's height closer to
* the Earth's surface. The zoom increment is 1.0.
*
* @return CameraUpdate Final Camera Position
*/
public static CameraUpdate zoomIn() {
return new ZoomUpdate(ZoomUpdate.ZOOM_IN);
}
/**
* Returns a CameraUpdate that zooms out on the map by moving the viewpoint's height farther
* away from the Earth's surface. The zoom increment is -1.0.
*
* @return CameraUpdate Final Camera Position
*/
public static CameraUpdate zoomOut() {
return new ZoomUpdate(ZoomUpdate.ZOOM_OUT);
}
/**
* Returns a CameraUpdate that moves the camera viewpoint to a particular zoom level.
*
* @param zoom Zoom level to change to
* @return CameraUpdate Final Camera Position
*/
public static CameraUpdate zoomTo(double zoom) {
return new ZoomUpdate(ZoomUpdate.ZOOM_TO, zoom);
}
//
// CameraUpdate types
//
static final class CameraPositionUpdate implements CameraUpdate {
private final double bearing;
private final LatLng target;
private final double tilt;
private final double zoom;
CameraPositionUpdate(double bearing, LatLng target, double tilt, double zoom) {
this.bearing = bearing;
this.target = target;
this.tilt = tilt;
this.zoom = zoom;
}
public LatLng getTarget() {
return target;
}
public double getBearing() {
return bearing;
}
public double getTilt() {
return tilt;
}
public double getZoom() {
return zoom;
}
@Override
public CameraPosition getCameraPosition(@NonNull MapboxMap mapboxMap) {
CameraPosition previousPosition = mapboxMap.getCameraPosition();
if (target == null) {
return new CameraPosition.Builder(this)
.target(previousPosition.target)
.build();
}
return new CameraPosition.Builder(this).build();
}
}
static final class CameraBoundsUpdate implements CameraUpdate {
private LatLngBounds bounds;
private RectF padding;
CameraBoundsUpdate(LatLngBounds bounds, RectF padding) {
this.bounds = bounds;
this.padding = padding;
}
CameraBoundsUpdate(LatLngBounds bounds, int[] padding) {
this(bounds, new RectF(padding[0], padding[1], padding[2], padding[3]));
}
CameraBoundsUpdate(LatLngBounds bounds, int paddingLeft, int paddingTop, int paddingRight, int paddingBottom) {
this(bounds, new int[] {paddingLeft, paddingTop, paddingRight, paddingBottom});
}
public LatLngBounds getBounds() {
return bounds;
}
public RectF getPadding() {
return padding;
}
@Override
public CameraPosition getCameraPosition(@NonNull MapboxMap mapboxMap) {
// Get required objects
Projection projection = mapboxMap.getProjection();
UiSettings uiSettings = mapboxMap.getUiSettings();
// calculate correct padding
int[] mapPadding = mapboxMap.getPadding();
RectF latLngPadding = getPadding();
RectF padding = new RectF(latLngPadding.left + mapPadding[0],
latLngPadding.top + mapPadding[1],
latLngPadding.right + mapPadding[2],
latLngPadding.bottom + mapPadding[3]);
// Calculate the bounds of the possibly rotated shape with respect to the viewport
PointF nePixel = new PointF(-Float.MAX_VALUE, -Float.MAX_VALUE);
PointF swPixel = new PointF(Float.MAX_VALUE, Float.MAX_VALUE);
float viewportHeight = uiSettings.getHeight();
for (LatLng latLng : getBounds().toLatLngs()) {
PointF pixel = projection.toScreenLocation(latLng);
swPixel.x = Math.min(swPixel.x, pixel.x);
nePixel.x = Math.max(nePixel.x, pixel.x);
swPixel.y = Math.min(swPixel.y, viewportHeight - pixel.y);
nePixel.y = Math.max(nePixel.y, viewportHeight - pixel.y);
}
// Calculate width/height
float width = nePixel.x - swPixel.x;
float height = nePixel.y - swPixel.y;
double zoom = 0;
float minScale = 1;
// Calculate the zoom level
if (padding != null) {
float scaleX = (uiSettings.getWidth() - padding.left - padding.right) / width;
float scaleY = (uiSettings.getHeight() - padding.top - padding.bottom) / height;
minScale = scaleX < scaleY ? scaleX : scaleY;
zoom = calculateZoom(mapboxMap, minScale);
zoom = MathUtils.clamp(zoom, mapboxMap.getMinZoomLevel(), mapboxMap.getMaxZoomLevel());
}
// Calculate the center point
PointF paddedNEPixel = new PointF(nePixel.x + padding.right / minScale, nePixel.y + padding.top / minScale);
PointF paddedSWPixel = new PointF(swPixel.x - padding.left / minScale, swPixel.y - padding.bottom / minScale);
PointF centerPixel = new PointF((paddedNEPixel.x + paddedSWPixel.x) / 2, (paddedNEPixel.y + paddedSWPixel.y) / 2);
centerPixel.y = viewportHeight - centerPixel.y;
LatLng center = projection.fromScreenLocation(centerPixel);
return new CameraPosition.Builder()
.target(center)
.zoom(zoom)
.tilt(0)
.bearing(0)
.build();
}
/**
* Calculates a zoom level based on minimum scale and current scale from MapView
*
* @param minScale The minimum scale to calculate the zoom level.
* @return zoom level that fits the MapView.
*/
public double calculateZoom(MapboxMap mapboxMap, float minScale) {
return Math.log(mapboxMap.getCameraPosition().zoom * minScale) / Math.log(2);
}
}
static final class CameraMoveUpdate implements CameraUpdate {
private float x;
private float y;
CameraMoveUpdate(float x, float y) {
this.x = x;
this.y = y;
}
@Override
public CameraPosition getCameraPosition(@NonNull MapboxMap mapboxMap) {
UiSettings uiSettings = mapboxMap.getUiSettings();
Projection projection = mapboxMap.getProjection();
// Calculate the new center point
float viewPortWidth = uiSettings.getWidth();
float viewPortHeight = uiSettings.getHeight();
PointF targetPoint = new PointF(viewPortWidth / 2 + x, viewPortHeight / 2 + y);
// Convert point to LatLng
LatLng latLng = projection.fromScreenLocation(targetPoint);
CameraPosition previousPosition = mapboxMap.getCameraPosition();
return new CameraPosition.Builder()
.target(latLng != null ? latLng : previousPosition.target)
.zoom(previousPosition.zoom)
.tilt(previousPosition.tilt)
.bearing(previousPosition.bearing)
.build();
}
}
static final class ZoomUpdate implements CameraUpdate {
@IntDef( {ZOOM_IN, ZOOM_OUT, ZOOM_BY, ZOOM_TO, ZOOM_TO_POINT})
@Retention(RetentionPolicy.SOURCE)
@interface Type {
}
static final int ZOOM_IN = 0;
static final int ZOOM_OUT = 1;
static final int ZOOM_BY = 2;
static final int ZOOM_TO = 3;
static final int ZOOM_TO_POINT = 4;
@Type
private final int type;
private final double zoom;
private float x;
private float y;
ZoomUpdate(@Type int type) {
this.type = type;
this.zoom = 0;
}
ZoomUpdate(@Type int type, double zoom) {
this.type = type;
this.zoom = zoom;
}
ZoomUpdate(double zoom, float x, float y) {
this.type = ZOOM_TO_POINT;
this.zoom = zoom;
this.x = x;
this.y = y;
}
public double getZoom() {
return zoom;
}
@Type
public int getType() {
return type;
}
public float getX() {
return x;
}
public float getY() {
return y;
}
double transformZoom(double currentZoom) {
switch (getType()) {
case CameraUpdateFactory.ZoomUpdate.ZOOM_IN:
currentZoom++;
break;
case CameraUpdateFactory.ZoomUpdate.ZOOM_OUT:
currentZoom--;
if (currentZoom < 0) {
currentZoom = 0;
}
break;
case CameraUpdateFactory.ZoomUpdate.ZOOM_TO:
currentZoom = getZoom();
break;
case CameraUpdateFactory.ZoomUpdate.ZOOM_BY:
currentZoom = currentZoom + getZoom();
break;
case CameraUpdateFactory.ZoomUpdate.ZOOM_TO_POINT:
currentZoom = currentZoom + getZoom();
break;
}
return currentZoom;
}
@Override
public CameraPosition getCameraPosition(@NonNull MapboxMap mapboxMap) {
CameraPosition cameraPosition = mapboxMap.getCameraPosition();
if (getType() != CameraUpdateFactory.ZoomUpdate.ZOOM_TO_POINT) {
return new CameraPosition.Builder(cameraPosition)
.zoom(transformZoom(cameraPosition.zoom))
.build();
} else {
return new CameraPosition.Builder(cameraPosition)
.zoom(transformZoom(cameraPosition.zoom))
.target(mapboxMap.getProjection().fromScreenLocation(new PointF(getX(), getY())))
.build();
}
}
}
}
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