ab6185fdc3
Replaced preflight checks in MGLLatLngFromLocationCoordinate2D() with a try-catch block that relays exceptions raised by mbgl. De-inlined the function because it’s no longer trivial.
60 lines
2.5 KiB
Plaintext
60 lines
2.5 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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/** 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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MGL_EXPORT
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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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MGL_EXPORT
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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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