ENH: Cut optimization, support for custom connectors

Change-Id: I65163314374fb74f0b16df47dacae82caa6fab0d
(cherry picked from commit 7bacc2c2a89be471f6fee51dd07a42222a28b55a)

src/slic3r/GUI/CameraUtils.hpp

@@ -0,0 +1,69 @@
+#ifndef slic3r_CameraUtils_hpp_
+#define slic3r_CameraUtils_hpp_
+
+#include "Camera.hpp"
+#include "libslic3r/Point.hpp"
+namespace Slic3r {
+class GLVolume;
+}
+	
+namespace Slic3r::GUI {
+/// <summary>
+/// Help divide camera data and camera functions
+/// This utility work with camera data by static funtions
+/// </summary>
+class CameraUtils
+{
+public:
+    CameraUtils() = delete; // only static functions
+
+	/// <summary>
+	/// Project point throw camera to 2d coordinate into imgui window
+	/// </summary>
+	/// <param name="camera">Projection params</param>
+	/// <param name="points">Point to project.</param>
+    /// <returns>projected points by camera into coordinate of camera.
+    /// x(from left to right), y(from top to bottom)</returns>
+	static Points project(const Camera& camera, const std::vector<Vec3d> &points);
+	static Point project(const Camera& camera, const Vec3d &point);
+
+	/// <summary>
+	/// Create hull around GLVolume in 2d space of camera
+	/// </summary>
+	/// <param name="camera">Projection params</param>
+	/// <param name="volume">Outline by 3d object</param>
+	/// <returns>Polygon around object</returns>
+	static Polygon create_hull2d(const Camera &camera, const GLVolume &volume);
+	
+	/// <summary>
+	/// Create ray(point and direction) for screen coordinate
+	/// </summary>
+	/// <param name="camera">Definition of camera</param>
+	/// <param name="position">Position on screen(aka mouse position) </param>
+	/// <param name="point">OUT start of ray</param>
+	/// <param name="direction">OUT direction of ray</param>
+    static void ray_from_screen_pos(const Camera &camera, const Vec2d &position, Vec3d &point, Vec3d &direction); 
+    static void ray_from_ortho_screen_pos(const Camera &camera, const Vec2d &position, Vec3d &point, Vec3d &direction);
+    static void ray_from_persp_screen_pos(const Camera &camera, const Vec2d &position, Vec3d &point, Vec3d &direction);
+
+	/// <summary>
+	/// Unproject mouse coordinate to get position in space where z coor is zero
+	/// Platter surface should be in z == 0
+	/// </summary>
+	/// <param name="camera">Projection params</param>
+	/// <param name="coor">Mouse position</param>
+	/// <returns>Position on platter under mouse</returns>
+    static Vec2d get_z0_position(const Camera &camera, const Vec2d &coor);
+
+    /// <summary>
+    /// Create 3d screen point from 2d position
+    /// </summary>
+    /// <param name="camera">Define camera viewport</param>
+    /// <param name="position">Position on screen(aka mouse position)</param>
+    /// <returns>Point represented screen coor in 3d</returns>
+    static Vec3d screen_point(const Camera &camera, const Vec2d &position);
+
+};
+} // Slic3r::GUI
+
+#endif /* slic3r_CameraUtils_hpp_ */