14dc94e65f
`UIScreen.nativeScale` is available beginning in iOS 8, so the conditional is no longer necessary.
123 lines
6.0 KiB
Plaintext
123 lines
6.0 KiB
Plaintext
#import "MGLGeometry_Private.h"
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#import "MGLFoundation.h"
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#import <mbgl/util/projection.hpp>
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#if !TARGET_OS_IPHONE && !TARGET_OS_SIMULATOR
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#import <Cocoa/Cocoa.h>
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#endif
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/** Vertical field of view, measured in degrees, for determining the altitude
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of the viewpoint.
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TransformState::getProjMatrix() has a variable vertical field of view that
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defaults to 2 arctan ⅓ rad ≈ 36.9° but MapKit uses a vertical field of view of 30°.
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flyTo() assumes a field of view of 2 arctan ½ rad. */
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const CLLocationDegrees MGLAngularFieldOfView = 30;
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const MGLCoordinateSpan MGLCoordinateSpanZero = {0, 0};
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CGRect MGLExtendRect(CGRect rect, CGPoint point) {
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if (point.x < rect.origin.x) {
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rect.size.width += rect.origin.x - point.x;
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rect.origin.x = point.x;
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}
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if (point.x > rect.origin.x + rect.size.width) {
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rect.size.width += point.x - (rect.origin.x + rect.size.width);
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}
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if (point.y < rect.origin.y) {
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rect.size.height += rect.origin.y - point.y;
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rect.origin.y = point.y;
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}
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if (point.y > rect.origin.y + rect.size.height) {
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rect.size.height += point.y - (rect.origin.y + rect.size.height);
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}
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return rect;
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}
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mbgl::LatLng MGLLatLngFromLocationCoordinate2D(CLLocationCoordinate2D coordinate) {
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try {
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return mbgl::LatLng(coordinate.latitude, coordinate.longitude);
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} catch (std::domain_error &error) {
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[NSException raise:NSInvalidArgumentException format:@"%s", error.what()];
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return {};
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}
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}
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CLLocationDistance MGLAltitudeForZoomLevel(double zoomLevel, CGFloat pitch, CLLocationDegrees latitude, CGSize size) {
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CLLocationDistance metersPerPixel = mbgl::Projection::getMetersPerPixelAtLatitude(latitude, zoomLevel);
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CLLocationDistance metersTall = metersPerPixel * size.height;
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CLLocationDistance altitude = metersTall / 2 / std::tan(MGLRadiansFromDegrees(MGLAngularFieldOfView) / 2.);
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return altitude * std::sin(M_PI_2 - MGLRadiansFromDegrees(pitch)) / std::sin(M_PI_2);
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}
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double MGLZoomLevelForAltitude(CLLocationDistance altitude, CGFloat pitch, CLLocationDegrees latitude, CGSize size) {
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CLLocationDistance eyeAltitude = altitude / std::sin(M_PI_2 - MGLRadiansFromDegrees(pitch)) * std::sin(M_PI_2);
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CLLocationDistance metersTall = eyeAltitude * 2 * std::tan(MGLRadiansFromDegrees(MGLAngularFieldOfView) / 2.);
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CLLocationDistance metersPerPixel = metersTall / size.height;
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CGFloat mapPixelWidthAtZoom = std::cos(MGLRadiansFromDegrees(latitude)) * mbgl::util::M2PI * mbgl::util::EARTH_RADIUS_M / metersPerPixel;
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return ::log2(mapPixelWidthAtZoom / mbgl::util::tileSize);
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}
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MGLRadianDistance MGLDistanceBetweenRadianCoordinates(MGLRadianCoordinate2D from, MGLRadianCoordinate2D to) {
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double a = pow(sin((to.latitude - from.latitude) / 2), 2)
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+ pow(sin((to.longitude - from.longitude) / 2), 2) * cos(from.latitude) * cos(to.latitude);
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return 2 * atan2(sqrt(a), sqrt(1 - a));
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}
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MGLRadianDirection MGLRadianCoordinatesDirection(MGLRadianCoordinate2D from, MGLRadianCoordinate2D to) {
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double a = sin(to.longitude - from.longitude) * cos(to.latitude);
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double b = cos(from.latitude) * sin(to.latitude)
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- sin(from.latitude) * cos(to.latitude) * cos(to.longitude - from.longitude);
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return atan2(a, b);
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}
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MGLRadianCoordinate2D MGLRadianCoordinateAtDistanceFacingDirection(MGLRadianCoordinate2D coordinate,
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MGLRadianDistance distance,
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MGLRadianDirection direction) {
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double otherLatitude = asin(sin(coordinate.latitude) * cos(distance)
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+ cos(coordinate.latitude) * sin(distance) * cos(direction));
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double otherLongitude = coordinate.longitude + atan2(sin(direction) * sin(distance) * cos(coordinate.latitude),
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cos(distance) - sin(coordinate.latitude) * sin(otherLatitude));
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return MGLRadianCoordinate2DMake(otherLatitude, otherLongitude);
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}
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CLLocationDirection MGLDirectionBetweenCoordinates(CLLocationCoordinate2D firstCoordinate, CLLocationCoordinate2D secondCoordinate) {
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// Ported from https://github.com/mapbox/turf-swift/blob/857e2e8060678ef4a7a9169d4971b0788fdffc37/Turf/Turf.swift#L23-L31
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MGLRadianCoordinate2D firstRadianCoordinate = MGLRadianCoordinateFromLocationCoordinate(firstCoordinate);
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MGLRadianCoordinate2D secondRadianCoordinate = MGLRadianCoordinateFromLocationCoordinate(secondCoordinate);
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CGFloat a = sin(secondRadianCoordinate.longitude - firstRadianCoordinate.longitude) * cos(secondRadianCoordinate.latitude);
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CGFloat b = (cos(firstRadianCoordinate.latitude) * sin(secondRadianCoordinate.latitude)
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- sin(firstRadianCoordinate.latitude) * cos(secondRadianCoordinate.latitude) * cos(secondRadianCoordinate.longitude - firstRadianCoordinate.longitude));
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MGLRadianDirection radianDirection = atan2(a, b);
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return radianDirection * 180 / M_PI;
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}
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CGPoint MGLPointRounded(CGPoint point) {
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#if TARGET_OS_IPHONE || TARGET_OS_SIMULATOR
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CGFloat scaleFactor = [UIScreen mainScreen].nativeScale;
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#elif TARGET_OS_MAC
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CGFloat scaleFactor = [NSScreen mainScreen].backingScaleFactor;
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#endif
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return CGPointMake(round(point.x * scaleFactor) / scaleFactor, round(point.y * scaleFactor) / scaleFactor);
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}
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MGLMapPoint MGLMapPointForCoordinate(CLLocationCoordinate2D coordinate, double zoomLevel) {
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mbgl::Point<double> projectedCoordinate = mbgl::Projection::project(MGLLatLngFromLocationCoordinate2D(coordinate), std::pow(2.0, zoomLevel));
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return MGLMapPointMake(projectedCoordinate.x, projectedCoordinate.y, zoomLevel);
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}
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MGLMatrix4 MGLMatrix4Make(std::array<double, 16> array) {
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MGLMatrix4 mat4 = {
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.m00 = array[0], .m01 = array[1], .m02 = array[2], .m03 = array[3],
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.m10 = array[4], .m11 = array[5], .m12 = array[6], .m13 = array[7],
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.m20 = array[8], .m21 = array[9], .m22 = array[10], .m23 = array[11],
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.m30 = array[12], .m31 = array[13], .m32 = array[14], .m33 = array[15]
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};
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return mat4;
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}
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