Ported Slic3r::GCode::AvoidCrossingPerimeters to XS

xs/src/libslic3r/GCode.cpp

@@ -0,0 +1,70 @@
+#include "GCode.hpp"
+
+namespace Slic3r {
+
+AvoidCrossingPerimeters::AvoidCrossingPerimeters()
+    : use_external_mp(false), use_external_mp_once(false), disable_once(true),
+        _external_mp(NULL), _layer_mp(NULL)
+{
+}
+
+AvoidCrossingPerimeters::~AvoidCrossingPerimeters()
+{
+    if (this->_external_mp != NULL)
+        delete this->_external_mp;
+    
+    if (this->_layer_mp != NULL)
+        delete this->_layer_mp;
+}
+
+void
+AvoidCrossingPerimeters::init_external_mp(const ExPolygons &islands)
+{
+    if (this->_external_mp != NULL)
+        delete this->_external_mp;
+    
+    this->_external_mp = new MotionPlanner(islands);
+}
+
+void
+AvoidCrossingPerimeters::init_layer_mp(const ExPolygons &islands)
+{
+    if (this->_layer_mp != NULL)
+        delete this->_layer_mp;
+    
+    this->_layer_mp = new MotionPlanner(islands);
+}
+
+Polyline
+AvoidCrossingPerimeters::travel_to(Point point, const Pointf &gcodegen_origin,
+    const Point &gcodegen_last_pos)
+{
+    if (this->use_external_mp || this->use_external_mp_once) {
+        // get current origin set in gcodegen
+        // (the one that will be used to translate the G-code coordinates by)
+        Point scaled_origin = Point::new_scale(gcodegen_origin.x, gcodegen_origin.y);
+        
+        // represent last_pos in absolute G-code coordinates
+        Point last_pos = gcodegen_last_pos;
+        last_pos.translate(scaled_origin);
+        
+        // represent point in absolute G-code coordinates
+        point.translate(scaled_origin);
+        
+        // calculate path
+        Polyline travel = this->_external_mp->shortest_path(last_pos, point);
+        
+        // translate the path back into the shifted coordinate system that gcodegen
+        // is currently using for writing coordinates
+        travel.translate(scaled_origin.negative());
+        return travel;
+    } else {
+        return this->_layer_mp->shortest_path(gcodegen_last_pos, point);
+    }
+}
+
+#ifdef SLIC3RXS
+REGISTER_CLASS(AvoidCrossingPerimeters, "GCode::AvoidCrossingPerimeters");
+#endif
+
+}