Add first layer detection and fan control - prototype

src/libslic3r/BeltGCodeWriter.hpp

@@ -5,6 +5,8 @@
 
 namespace Slic3r {
 
+class FirstLayerPlane;
+
 // Belt-printer-specific GCode writer.
 //
 // Inherits from GCodeWriter and overrides movement methods to apply
@@ -22,6 +24,16 @@ public:
     void set_origin_snap(int axis, bool enable, double offset, double bbox_min);
     Vec3d to_machine_coords(const Vec3d &pos) const;
 
+    // First-layer plane: when set to a non-null active evaluator, travel
+    // speed selection consults the plane per-move and uses
+    // initial_layer_travel_speed for points within first_layer_height_mm
+    // of the plane (regardless of slicing layer index).
+    void set_first_layer_plane(const FirstLayerPlane *plane,
+                               double first_layer_height_mm) {
+        m_first_layer_plane         = plane;
+        m_first_layer_thickness_mm  = first_layer_height_mm;
+    }
+
     // Overridden movement methods
     std::string travel_to_xy(const Vec2d &point, const std::string &comment = std::string()) override;
     std::string travel_to_xyz(const Vec3d &point, const std::string &comment = std::string(), bool force_z = false) override;
@@ -39,6 +51,9 @@ private:
     bool            m_origin_snap[3]     = {false, false, false};
     double          m_origin_offset[3]   = {0., 0., 0.};
     double          m_origin_bbox_min[3] = {0., 0., 0.};
+    // Borrowed pointer; lifetime owned by GCode.  null = inactive.
+    const FirstLayerPlane *m_first_layer_plane = nullptr;
+    double          m_first_layer_thickness_mm = 0.;
 };
 
 } // namespace Slic3r