save camera settings on selection to avoid different result when re-projecting the selection 2d screen points transformation (does not compile because of canvas.h cyclic dependency)

data/layout.xml

@@ -1087,11 +1087,11 @@ Here's a list of what's available in this release.
           <button-custom id="btn-layer" width="50" height="50" margin="0 0 5 0" thickness="1" border-color=".1" pad="2">
             <image path="data/ui/layers.png" width="100%" height="100%" align="center" justify="flex-end"/>
           </button-custom>
-          <!--
+          
           <button-custom id="btn-grids-panel" width="50" height="50" margin="0 0 5 0" thickness="1" border-color=".1" pad="2">
             <image path="data/ui/grid.png" width="100%" height="100%" align="center" justify="flex-end" mips="true"/>
           </button-custom>
-          -->
+          
         </border>
         <!-- side bar -->
         <node height="100%" dir="row" shrink="1">

src/canvas.cpp

@@ -2143,6 +2143,48 @@ std::vector<glm::vec2> ui::Canvas::face_to_shape2D(int plane_index)
     return points;
 }
 
+void ui::Canvas::push_camera()
+{
+    m_camera_stack.push(get_camera());
+}
+
+void ui::Canvas::pop_camera()
+{
+    if (!m_camera_stack.empty())
+    {
+        set_camera(m_camera_stack.top());
+        m_camera_stack.pop();
+    }
+}
+
+ui::Canvas::CameraData ui::Canvas::get_camera()
+{
+    CameraData c;
+    c.m_box = m_box;
+    c.m_mv = m_mv;
+    c.m_pan = m_pan;
+    std::copy_n(m_plane_dir, 6, c.m_plane_dir);
+    std::copy_n(m_plane_unproject, 6, c.m_plane_unproject);
+    c.m_proj = m_proj;
+    c.m_vp = m_vp;
+    return c;
+}
+
+void ui::Canvas::set_camera(const ui::Canvas::CameraData& c)
+{
+    m_box = c.m_box;
+    m_mv = c.m_mv;
+    m_pan = c.m_pan;
+    std::copy_n(c.m_plane_dir, 6, m_plane_dir);
+    std::copy_n(c.m_plane_unproject, 6, m_plane_unproject);
+    m_proj = c.m_proj;
+    m_vp = c.m_vp;
+}
+
+void ui::Canvas::reset_camera()
+{
+}
+
 std::vector<vertex_t> ui::Canvas::triangulate_simple(const std::vector<vertex_t>& vertices)
 {
     std::vector<vertex_t> ret;

src/canvas.h

@@ -6,6 +6,7 @@
 #include "brush.h"
 #include "action.h"
 #include "canvas_modes.h"
+#include <stack>
 
 NS_START
 
@@ -100,6 +101,17 @@ struct PPIHeader
     }
 };
 
+struct CameraData
+{
+    glm::mat4 m_mv{ 1 };
+    glm::mat4 m_proj{ 1 };
+    glm::vec4 m_box{ 0 };
+    glm::vec4 m_vp{ 0 };
+    glm::vec2 m_pan{ 0 };
+    glm::mat4 m_plane_unproject[6] = SIXPLETTE(glm::mat4(1));
+    glm::vec3 m_plane_dir[6] = SIXPLETTE(glm::vec3(0));
+};
+
 class Canvas
 {
 public:
@@ -112,6 +124,7 @@ public:
     bool m_dirty = false;
     bool m_commit_delayed = false;
     bool m_dirty_stroke = false;
+    std::stack<CameraData> m_camera_stack;
 
     static Canvas* I;
     NodeCanvas* m_node = nullptr;
@@ -241,6 +254,11 @@ public:
     void project2Dpoints(std::vector<vertex_t>& vertices);
     glm::vec3 project2Dpoint(glm::vec2 pt);
     std::vector<glm::vec2> face_to_shape2D(int plane_index);
+    void push_camera();
+    void pop_camera();
+    CameraData get_camera();
+    void set_camera(const CameraData& c);
+    void reset_camera();
 };
 
 class ActionStroke : public Action

src/canvas_modes.cpp

@@ -493,7 +493,7 @@ void CanvasModeMaskFree::on_MouseEvent(MouseEvent* me, glm::vec2& loc)
         {
             if (!m_points.empty())
             {
-
+                m_selection_cam = canvas->get_camera();
                 //m_points2d = poly_intersect(poly_remove_duplicate(m_points2d), canvas->face_to_shape2D(0));
                 auto drawer = [this](const glm::mat4& camera, const glm::mat4& proj) {
                     //glEnable(GL_BLEND);
@@ -910,6 +910,9 @@ void CanvasModeTransform::enter()
     canvas->m_smask_active = false;
     auto points = m->m_points2d;
 
+    canvas->push_camera();
+    canvas->set_camera(m->m_selection_cam);
+
     glm::vec2 bb_min(FLT_MAX);
     glm::vec2 bb_max(-FLT_MAX);
     for (auto p2d : points)
@@ -1079,6 +1082,8 @@ void CanvasModeTransform::enter()
 
         m_source_image.destroy();
     }
+
+    canvas->pop_camera();
 }
 
 void CanvasModeTransform::leave()

src/canvas_modes.h

@@ -3,11 +3,12 @@
 #include "shape.h"
 #include "brush.h"
 #include "texture.h"
+#include "canvas.h"
 #include <poly2tri.h>
 
-NS_START
-class Canvas;
-NS_END
+// NS_START
+// class Canvas;
+// NS_END
 
 class CanvasMode
 {
@@ -122,6 +123,7 @@ class CanvasModeMaskFree : public CanvasMode
     bool m_dragging = false;
     std::vector<vertex_t> m_points;
     std::vector<glm::vec2> m_points2d;
+    struct ui::CameraData m_selection_cam;
 public:
     virtual void on_Draw(const glm::mat4& ortho, const glm::mat4& proj, const glm::mat4& camera) override;
     virtual void on_MouseEvent(MouseEvent* me, glm::vec2& loc) override;