Added GCode/PrintExtents.cpp,h

Added a check for a collision between the multi material priming
regions with the rest of the print.

xs/src/libslic3r/GCode/PrintExtents.hpp

@@ -0,0 +1,30 @@
+// Measure extents of the planned extrusions.
+// To be used for collision reporting.
+
+#ifndef slic3r_PrintExtents_hpp_
+#define slic3r_PrintExtents_hpp_
+
+#include "libslic3r.h"
+
+namespace Slic3r {
+
+class Print;
+class PrintObject;
+class BoundingBoxf;
+
+// Returns a bounding box of a projection of the brim and skirt.
+BoundingBoxf get_print_extrusions_extents(const Print &print);
+
+// Returns a bounding box of a projection of the object extrusions at z <= max_print_z.
+BoundingBoxf get_print_object_extrusions_extents(const PrintObject &print_object, const coord_t max_print_z);
+
+// Returns a bounding box of a projection of the wipe tower for the layers <= max_print_z.
+// The projection does not contain the priming regions.
+BoundingBoxf get_wipe_tower_extrusions_extents(const Print &print, const coord_t max_print_z);
+
+// Returns a bounding box of the wipe tower priming extrusions.
+BoundingBoxf get_wipe_tower_priming_extrusions_extents(const Print &print);
+
+};
+
+#endif /* slic3r_PrintExtents_hpp_ */