Grab nodes in view

UserInterfaceManager.cpp

@@ -228,6 +228,8 @@ void UserInterface::handleMouse()
 //                // drag current
 //                Log::Info("Dragging %d", current->id());
 //                current->translation_.x += io.MouseDelta.x * 0.1f;
+Mixer::manager().currentView()->grab( glm::vec2(io.MouseClickedPos[ImGuiMouseButton_Left].x, io.MouseClickedPos[ImGuiMouseButton_Left].y), glm::vec2(io.MousePos.x, io.MousePos.y), current);
+
 
             }
             else {

View.cpp

@@ -74,6 +74,27 @@ void MixingView::drag (glm::vec2 from, glm::vec2 to)
 
 }
 
+
+void MixingView::grab (glm::vec2 from, glm::vec2 to, Node *node)
+{
+    static glm::vec3 start_translation = glm::vec3(0.f);
+    static glm::vec2 start_position = glm::vec2(0.f);
+
+    if ( start_position != from ) {
+        start_position = from;
+        start_translation = node->translation_;
+    }
+
+    // unproject
+    glm::vec3 gl_Position_from = Rendering::manager().unProject(from, node->transform_);
+    glm::vec3 gl_Position_to = Rendering::manager().unProject(to, node->transform_);
+
+    // compute delta translation
+    node->translation_ = start_translation + gl_Position_to - gl_Position_from;
+
+
+}
+
 RenderView::RenderView() : View(), frame_buffer_(nullptr)
 {
     setResolution(1280, 720);

View.h

@@ -17,6 +17,7 @@ public:
     virtual void draw () = 0;
     virtual void zoom (float) {}
     virtual void drag (glm::vec2, glm::vec2) {}
+    virtual void grab (glm::vec2, glm::vec2, Node*) {}
 
     Scene scene;
 
@@ -34,6 +35,7 @@ public:
     void draw () override;
     void zoom (float factor);
     void drag (glm::vec2 from, glm::vec2 to);
+    void grab (glm::vec2 from, glm::vec2 to, Node *node);
 
 };