Ported point_line_distance() and removed same_point()

xs/src/Line.cpp

@@ -60,6 +60,12 @@ Line::coincides_with(const Line* line) const
     return this->a.coincides_with(&line->a) && this->b.coincides_with(&line->b);
 }
 
+double
+Line::distance_to(const Point* point) const
+{
+    return point->distance_to(this);
+}
+
 #ifdef SLIC3RXS
 void
 Line::from_SV(SV* line_sv)

xs/src/Line.hpp

@@ -6,6 +6,8 @@
 
 namespace Slic3r {
 
+class Line;
+
 class Line
 {
     public:
@@ -21,6 +23,7 @@ class Line
     Point* midpoint() const;
     Point* point_at(double distance) const;
     bool coincides_with(const Line* line) const;
+    double distance_to(const Point* point) const;
     
     #ifdef SLIC3RXS
     void from_SV(SV* line_sv);

xs/src/Point.cpp

@@ -1,4 +1,5 @@
 #include "Point.hpp"
+#include "Line.hpp"
 #include <math.h>
 
 namespace Slic3r {
@@ -72,6 +73,17 @@ Point::distance_to(const Point* point) const
     return sqrt(dx*dx + dy*dy);
 }
 
+double
+Point::distance_to(const Line* line) const
+{
+    if (line->a.coincides_with(&line->b)) return this->distance_to(&line->a);
+    
+    double n = (line->b.x - line->a.x) * (line->a.y - this->y)
+        - (line->a.x - this->x) * (line->b.y - line->a.y);
+    
+    return abs(n) / line->length();
+}
+
 #ifdef SLIC3RXS
 SV*
 Point::to_SV_ref() {

xs/src/Point.hpp

@@ -7,6 +7,7 @@
 
 namespace Slic3r {
 
+class Line;
 class Point;
 typedef std::vector<Point> Points;
 
@@ -23,6 +24,7 @@ class Point
     int nearest_point_index(const Points points) const;
     Point* nearest_point(Points points) const;
     double distance_to(const Point* point) const;
+    double distance_to(const Line* line) const;
     
     #ifdef SLIC3RXS
     void from_SV(SV* point_sv);