Fix rotation transform

Decorations.cpp

@@ -1,11 +1,13 @@
 #include <glm/gtc/matrix_transform.hpp>
 #include <glm/gtx/vector_angle.hpp>
+#include <glm/gtx/component_wise.hpp>
 
 #include "Decorations.h"
 
 #include "Visitor.h"
 #include "ImageShader.h"
 #include "GlmToolkit.h"
+#include "Log.h"
 
 
 Frame::Frame(Type type) : Node(), type_(type), side_(nullptr), top_(nullptr), shadow_(nullptr), square_(nullptr)
@@ -163,6 +165,11 @@ void Handles::draw(glm::mat4 modelview, glm::mat4 projection)
         glm::vec3 rot(0.f);
         glm::vec4 vec = modelview * glm::vec4(1.f, 0.f, 0.f, 0.f);
         rot.z = glm::orientedAngle( glm::vec3(1.f, 0.f, 0.f), glm::normalize(glm::vec3(vec)), glm::vec3(0.f, 0.f, 1.f) );
+        vec = modelview * glm::vec4(0.f, 1.f, 0.f, 1.f);
+//        glm::vec3 scale( vec.x > 0.f ? 1.f : -1.f, vec.y > 0.f ? 1.f : -1.f, 1.f);
+//        glm::vec3 scale(1.f, 1.f, 1.f);
+
+//        Log::Info(" (0,1) becomes (%f, %f)", scale.x, scale.y);
 
         if ( type_ == RESIZE ) {
 
@@ -207,10 +214,24 @@ void Handles::draw(glm::mat4 modelview, glm::mat4 projection)
             // one icon in top right corner
             // 1. Fixed displacement by (0.12,0.12) along the rotation..
             ctm = GlmToolkit::transform(glm::vec4(0.f), rot, glm::vec3(1.f));
-            vec = ctm * glm::vec4(0.12f, 0.12f, 0.f, 1.f);
+            glm::vec4 pos = ctm * glm::vec4(0.12f, 0.12f, 0.f, 1.f);
+//            Log::Info(" (0.12,0.12) becomes (%f, %f)", pos.x, pos.y);
             // 2. ..from the top right corner (1,1)
-            vec = ( modelview * glm::vec4(1.f, 1.f, 0.f, 1.f) ) + vec;
+            vec = ( modelview * glm::vec4(1.f, 1.f, 0.f, 1.f) ) + pos;
             ctm = GlmToolkit::transform(vec, rot, glm::vec3(1.f));
+
+// TODO fix problem with negative scale
+//            glm::vec4 target = modelview * glm::vec4(1.2f, 1.2f, 0.f, 1.f);
+
+//            vec = modelview * glm::vec4(1.f, 1.f, 0.f, 1.f);
+//            glm::vec4 dv = target - vec;
+
+//            Log::Info("dv  (%f, %f)", dv.x, dv.y);
+//            float m = dv.x < dv.y ? dv.x : dv.y;
+//            Log::Info("min  %f", m);
+
+//            ctm = GlmToolkit::transform( glm::vec3(target), rot, glm::vec3(1.f));
+
             handle_->draw( ctm, projection );
         }
     }

PickingVisitor.cpp

@@ -78,8 +78,6 @@ void PickingVisitor::visit(Handles &n)
     // apply inverse transform to the point of interest
     glm::vec4 P = glm::inverse(modelview_) * glm::vec4( point_, 0.f, 1.f );
 
-    Log::Info("P  (%f, %f)", P.x, P.y);
-
     // inverse transform to check the scale
     glm::vec4 S = glm::inverse(modelview_) * glm::vec4( 0.05f, 0.05f, 0.f, 0.f );
     float scale = glm::length( glm::vec2(S) );
@@ -103,9 +101,10 @@ void PickingVisitor::visit(Handles &n)
                    glm::length(glm::vec2(0.f, -1.f)- glm::vec2(P)) < scale );
     }
     else if ( n.type() == Handles::ROTATE ){
-        // the icon for rotation is on the right top corner at (0.12, 0.12) in screen coordinates
+        // the icon for rotation is on the right top corner at (0.12, 0.12) in scene coordinates
-        glm::vec4 vec = glm::inverse(modelview_) * glm::vec4( 0.12f, 0.12f, 0.f, 0.f );
+        glm::vec4 vec = glm::inverse(modelview_) * glm::vec4( 0.1f, 0.1f, 0.f, 0.f );
-        picked = glm::length( glm::vec2( 1.f + glm::abs(vec.x), 1.f + glm::abs(vec.y)) - glm::vec2(P) ) < scale;
+        float l = glm::length( glm::vec2(vec) );
+        picked = glm::length( glm::vec2( 1.f + l, 1.f + l) - glm::vec2(P) ) < 1.5f * scale;
     }
 
     if ( picked )

View.cpp

@@ -441,7 +441,13 @@ View::Cursor GeometryView::grab (glm::vec2 from, glm::vec2 to, Source *s, std::p
         }
         // picking on the rotating handle
         else if ( pick.first == s->rotate_handle_ ) {
+            // rotation center to center of source
+            glm::mat4 T = glm::translate(glm::identity<glm::mat4>(), start_translation);
+            S_from = glm::inverse(T) * glm::vec4( gl_Position_from,  1.f );
+            S_to   = glm::inverse(T) * glm::vec4( gl_Position_to,  1.f );
+            // angle
             float angle = glm::orientedAngle( glm::normalize(glm::vec2(S_from)), glm::normalize(glm::vec2(S_to)));
+            // apply rotation on Z axis
             sourceNode->rotation_ = start_rotation + glm::vec3(0.f, 0.f, angle);
 
             int degrees = int(  glm::degrees(sourceNode->rotation_.z) );