[Marble-devel] Review Request 122989: Adding the path calculation method in annonate plugin for polyline

[hardik beladiya]

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https://git.reviewboard.kde.org/r/122989/
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Review request for Marble and Torsten Rahn.


Bugs: 345263
    http://bugs.kde.org/show_bug.cgi?id=345263


Repository: marble


Description
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Objective : Integration of marble with haversine formula  for calculation of path distance .


Research: There are few method from which we can calculate distance between two latitude and longitude point or we can say geographic coordinate . Some of the method are given here
1. haversine method
2.Spherical Law of Cosines
3.Equirectangular approximation
4.Bearing

Choosing right Method
I choose haversine  method because haversine formula   calculate the great-circle distance between two points – that is, the shortest distance over the earth’s surface – giving an ‘as-the-crow-flies’ distance between the points (ignoring any hills ) and  remains particularly well-conditioned for numerical computa­tion even at small distances’ – unlike calculations based on the spherical law of cosines


Distance calculation using the 'haversine' formula which is basically calculate the shotrtest distance between two point in earth surface

Haversine A  = sin²(??/2) + cos ?1 ? cos ?2 ? sin²(??/2) ;
c = 2 ? atan2( ?A, ?(1?A) )
d = R ? c 

A= is the square of half the chord length between the points.
R=mean radius of earth =6371
c =is the angular distance in radians

solution.
1). First of all we make function to calculate the distance between two point 
	eg. pointdistance(  lon,  lat , lon1,  lat1)
2)After we call this pointdistace() function  in the fuction pathdistance() and pass the value of       parameter and calculate the distance iterative.
	eg. Pathdistance(){
		for size of the vector -1 {
	distance +=pointdistance(  lon,  lat , lon1,  lat1);
	}	
}


Diffs
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  src/plugins/render/annotate/EditPolylineDialog.h 4d383b8 
  src/plugins/render/annotate/EditPolylineDialog.cpp a99a3e9 

Diff: https://git.reviewboard.kde.org/r/122989/diff/


Testing
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yes tested with the google map and the distance coming from the google map and our marble are same :)


Thanks,

hardik  beladiya

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