Full re-write of spiral vase (#3091)

* Practically full re-write of spiral vase
- Adds transition out to prevent sharp edge at the top of spiral vase.
- Adds XY interpolation
- Adds option to turn XY interpolation on/off

* - Increasing E to 5 decimal digits (I observed uneven flow with less than that)
- Excluding all travel moves (I saw a bug where somehow we ended up with travel moves within the print so excluding all travel moves)

* - max_xy_smoothing is now configurable, default is 200% of nozzle_diameter
- fixed no-op travel moves in the middle of spiral that now show up as defects when Smooth Spiral is enabled!

* - Avoiding namespace pollution
- Fixing dist_XY == 0 bug

---------

Co-authored-by: Andrew Boktor <aboktor@microsoft.com>
Co-authored-by: SoftFever <softfeverever@gmail.com>

src/libslic3r/GCode/SpiralVase.hpp

@@ -6,12 +6,23 @@
 
 namespace Slic3r {
 
-class SpiralVase {
+class SpiralVase
+{
 public:
+    class SpiralPoint
+    {
+    public:
+        SpiralPoint(float paramx, float paramy) : x(paramx), y(paramy) {}
+
+    public:
+        float x, y;
+    };
     SpiralVase(const PrintConfig &config) : m_config(config)
     {
         m_reader.z() = (float)m_config.z_offset;
         m_reader.apply_config(m_config);
+        m_previous_layer = NULL;
+        m_smooth_spiral = config.spiral_mode_smooth;
     };
 
     void 		enable(bool en) {
@@ -19,17 +30,22 @@ public:
     	m_enabled 		   = en;
     }
 
-    std::string process_layer(const std::string &gcode);
-    
+    std::string process_layer(const std::string &gcode, bool last_layer);
+    void set_max_xy_smoothing(float max) {
+        m_max_xy_smoothing = max;
+    }
 private:
     const PrintConfig  &m_config;
     GCodeReader 		m_reader;
+    float               m_max_xy_smoothing;
 
     bool 				m_enabled = false;
     // First spiral vase layer. Layer height has to be ramped up from zero to the target layer height.
     bool 				m_transition_layer = false;
+    // Whether to interpolate XY coordinates with the previous layer. Results in no seam at layer changes
+    bool                m_smooth_spiral = false;
+    std::vector<SpiralPoint> * m_previous_layer;
 };
-
 }
 
 #endif // slic3r_SpiralVase_hpp_