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src/libslic3r/Arachne/utils/ExtrusionJunction.hpp

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+//Copyright (c) 2020 Ultimaker B.V.
+//CuraEngine is released under the terms of the AGPLv3 or higher.
+
+
+#ifndef UTILS_EXTRUSION_JUNCTION_H
+#define UTILS_EXTRUSION_JUNCTION_H
+
+#include "../../Point.hpp"
+
+namespace Slic3r::Arachne
+{
+
+/*!
+ * This struct represents one vertex in an extruded path.
+ *
+ * It contains information on how wide the extruded path must be at this point,
+ * and which perimeter it represents.
+ */
+struct ExtrusionJunction
+{
+	/*!
+	 * The position of the centreline of the path when it reaches this junction.
+	 * This is the position that should end up in the g-code eventually.
+	 */
+    Point p;
+
+	/*!
+	 * The width of the extruded path at this junction.
+	 */
+    coord_t w;
+
+	/*!
+	 * Which perimeter this junction is part of.
+	 *
+	 * Perimeters are counted from the outside inwards. The outer wall has index
+	 * 0.
+	 */
+    size_t perimeter_index;
+
+    ExtrusionJunction(const Point p, const coord_t w, const coord_t perimeter_index);
+
+    bool operator==(const ExtrusionJunction& other) const;
+};
+
+inline Point operator-(const ExtrusionJunction& a, const ExtrusionJunction& b)
+{
+    return a.p - b.p;
+}
+
+// Identity function, used to be able to make templated algorithms that do their operations on 'point-like' input.
+inline const Point& make_point(const ExtrusionJunction& ej)
+{
+    return ej.p;
+}
+
+using LineJunctions = std::vector<ExtrusionJunction>; //<! The junctions along a line without further information. See \ref ExtrusionLine for a more extensive class.
+
+}
+#endif // UTILS_EXTRUSION_JUNCTION_H