[英]Need to know how to implement this code for Xcode Objective C
我正在嘗試根據當前位置、方位和距離獲取 GPS 坐標。
我找到了這個代碼:
- (double)degreesToRadians:(double)degrees {
return degrees * M_PI / 180;
}
- (double)radiansToDegrees:(double)radians {
return radians * 180/ M_PI;
}
- (CLLocationCoordinate2D)remoteCoordinate:(CLLocationCoordinate2D)localCoordinate withDistance:(double)distance withBearing:(double)bearing {
double earthRadius = 6378.1; // Radius of Earth in kilometres.
double rLat1 = [self degreesToRadians:localCoordinate.latitude]; // Convert latitude to radians
double rLon1 = [self degreesToRadians:localCoordinate.longitude]; // Convert longitude to radians
double rLat2 = asinl( sinl(rLat1) * cosl(distance / earthRadius) + cosl(rLat1) * sinl(distance / earthRadius) * cosl(bearing) );
double rLon2 = rLon1 + atan2l( sinl(bearing) * sinl(distance/earthRadius) * cosl(rLat1), cosl(distance/earthRadius) - sinl(rLat1) * sinl(rLat2) );
double dLat2 = [self radiansToDegrees:rLat2]; // Convert latitude to degrees
double dLon2 = [self radiansToDegrees:rLon2]; // Convert longuitude to degrees
return CLLocationCoordinate2DMake(dLat2, dLon2);
}
你好,我現在正在學習這個 iOS 編程,我喜歡嘗試你的代碼,看看它是如何工作的,現在我該如何實現這段代碼? 我可以看到以下輸入:
localCoordinate.latitude
localCoordinate.longitude
distance
bearing
輸出:
dLat2
dLon2
開始流程? 是輸入 NSStrings 嗎?
方位角 = [NSString stringWithFormat:@"%@.%@", deg1, min1]; // 度和分
intKiloMeters1 = [miles1 intValue] / 0.621371192;
NSLog(@"you get km %d", intKiloMeters1);
int distance;
distance = intKiloMeters1;
雙方位 = [self degreeToRadians:[azimuth doubleValue]];
double earthRadius = 6378.1; // Radius of Earth in kilometres.
double rLat1 = [self degreesToRadians:myCoordinate.latitude]; // Convert latitude to radians
double rLon1 = [self degreesToRadians:myCoordinate.longitude]; // Convert longitude to radians
double rLat2 = asinl( sinl(rLat1) * cosl(distance / earthRadius) + cosl(rLat1) * sinl(distance / earthRadius) * cosl(bearing) );
double rLon2 = rLon1 + atan2l( sinl(bearing) * sinl(distance/earthRadius) * cosl(rLat1), cosl(distance/earthRadius) - sinl(rLat1) * sinl(rLat2) );
double finalLat1 = [self radiansToDegrees:rLat2]; // Convert latitude to degrees
double finalLong1 = [self radiansToDegrees:rLon2]; // Convert longuitude to degrees
NSLog(@"Export Lat %f Long %f", finalLat1, finalLong1);
CLLocationCoordinate2D unknownCoordinate = {finalLat1, finalLong1};
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