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applied requested changes to EdgeBasedNode.h

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This commit is contained in:
Daniel Karch 2014-03-12 10:24:35 +01:00
parent b465dabe77
commit f923f508f5
1 changed files with 109 additions and 119 deletions
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50
DataStructures/EdgeBasedNode.h
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@ -9,8 +9,6 @@
#include "../Util/SimpleLogger.h"
#include "../typedefs.h"
#include <iostream>
#include <osrm/Coordinate.h>
// An EdgeBasedNode represents a node in the edge-expanded graph.
@ -41,7 +39,7 @@ struct EdgeBasedNode {
) const {
BOOST_ASSERT( query_location.isValid() );
double epsilon = 1.0/COORDINATE_PRECISION;
const double epsilon = 1.0/COORDINATE_PRECISION;
if( ignoreInGrid ) {
return std::numeric_limits<double>::max();
@ -66,10 +64,9 @@ struct EdgeBasedNode {
// TODO: Replace with euclidean approximation when k-NN search is done
// const double approximated_distance = FixedPointCoordinate::ApproximateEuclideanDistance(
const double approximated_distance =
FixedPointCoordinate::ApproximateDistance(query_location, nearest_location);
const double approximated_distance = FixedPointCoordinate::ApproximateDistance(query_location, nearest_location);
BOOST_ASSERT( 0. <= approximated_distance );
BOOST_ASSERT( 0.0 <= approximated_distance );
return approximated_distance;
}
@ -104,34 +101,27 @@ struct EdgeBasedNode {
private:
struct Point
{
const double x;
const double y;
typedef std::pair<double,double> Point;
Point(double x, double y)
: x(x), y(y) {}
};
// Compute the perpendicular foot of point r on the line defined by p and q.
Point ComputePerpendicularFoot(const Point &p, const Point &q, const Point &r, double epsilon) const {
// the projection of r onto the line pq
double foot_x;
double foot_y;
double foot_x, foot_y;
const bool parallel_to_y_axis = std::abs(q.x - p.x) < epsilon;
const bool is_parallel_to_y_axis = std::abs(q.first - p.first) < epsilon;
if( parallel_to_y_axis ) {
foot_x = q.x;
foot_y = r.y;
if( is_parallel_to_y_axis ) {
foot_x = q.first;
foot_y = r.second;
} else {
// the slope of the line through (a|b) and (c|d)
const double m = (q.y - p.y) / (q.x - p.x);
const double m = (q.second - p.second) / (q.first - p.first);
// Projection of (x|y) onto the line joining (a|b) and (c|d).
foot_x = ((r.x + (m*r.y)) + (m*m*p.x - m*p.y))/(1.0 + m*m);
foot_y = p.y + m*(foot_x - p.x);
foot_x = ((r.first + (m*r.second)) + (m*m*p.first - m*p.second))/(1.0 + m*m);
foot_y = p.second + m*(foot_x - p.first);
}
return Point(foot_x, foot_y);
@ -140,15 +130,15 @@ private:
// Compute the ratio of the line segment pr to line segment pq.
double ComputeRatio(const Point & p, const Point & q, const Point & r, double epsilon) const {
const bool parallel_to_x_axis = std::abs(q.y-p.y) < epsilon;
const bool parallel_to_y_axis = std::abs(q.x-p.x) < epsilon;
const bool is_parallel_to_x_axis = std::abs(q.second-p.second) < epsilon;
const bool is_parallel_to_y_axis = std::abs(q.first-p.first) < epsilon;
double ratio;
if( !parallel_to_y_axis ) {
ratio = (r.x - p.x)/(q.x - p.x);
} else if( !parallel_to_x_axis ) {
ratio = (r.y - p.y)/(q.y - p.y);
if( !is_parallel_to_y_axis ) {
ratio = (r.first - p.first)/(q.first - p.first);
} else if( !is_parallel_to_x_axis ) {
ratio = (r.second - p.second)/(q.second - p.second);
} else {
// (a|b) and (c|d) are essentially the same point
// by convention, we set the ratio to 0 in this case
@ -176,8 +166,8 @@ private:
return FixedPointCoordinate(lat2, lon2);
} else {
// r lies between p and q
return FixedPointCoordinate(y2lat(r.x)*COORDINATE_PRECISION,
r.y*COORDINATE_PRECISION);
return FixedPointCoordinate(y2lat(r.first)*COORDINATE_PRECISION,
r.second*COORDINATE_PRECISION);
}
}