com.graphhopper.util

Class AngleCalc

java.lang.Object

com.graphhopper.util.AngleCalc

public class AngleCalc
extends Object

Calculates the angle of a turn, defined by three points. The fast atan2 method is from Jim Shima, 1999, http://www.dspguru.com/dsp/tricks/fixed-point-atan2-with-self-normalization

Author:

Johannes Pelzer, Peter Karich

Constructor Summary

Constructors

Constructor and Description
AngleCalc()

Method Summary

Modifier and Type	Method and Description
double	alignOrientation(double baseOrientation, double orientation) Change the representation of an orientation, so the difference to the given baseOrientation will be smaller or equal to PI (180 degree).
double	calcOrientation(double lat1, double lon1, double lat2, double lon2) Return orientation of line relative to east.
double	convertAzimuth2xaxisAngle(double azimuth) convert north based clockwise azimuth (0, 360) into x-axis/east based angle (-Pi, Pi)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AngleCalc

public AngleCalc()

Method Detail

calcOrientation

public double calcOrientation(double lat1,
                              double lon1,
                              double lat2,
                              double lon2)

Return orientation of line relative to east.

Returns:

Orientation in interval -pi to +pi where 0 is east

convertAzimuth2xaxisAngle

public double convertAzimuth2xaxisAngle(double azimuth)

convert north based clockwise azimuth (0, 360) into x-axis/east based angle (-Pi, Pi)

alignOrientation

public double alignOrientation(double baseOrientation,
                               double orientation)

Change the representation of an orientation, so the difference to the given baseOrientation will be smaller or equal to PI (180 degree). This is achieved by adding or substracting a 2*PI, so the direction of the orientation will not be changed