From 9705d1850d0d780075021595350c809973e802ab Mon Sep 17 00:00:00 2001
From: rkv <rkv@opencascade.com>
Date: Wed, 25 Dec 2013 09:05:09 +0000
Subject: [PATCH] Fix for the Feature #102: Display of Lambert coordinates.

---
 src/HYDROGUI/HYDROGUI_Module.cxx | 83 +++++++++++++++++++++++---------
 src/HYDROGUI/HYDROGUI_Module.h   |  4 ++
 2 files changed, 64 insertions(+), 23 deletions(-)

diff --git a/src/HYDROGUI/HYDROGUI_Module.cxx b/src/HYDROGUI/HYDROGUI_Module.cxx
index ff2d3a0f..4d6b818b 100644
--- a/src/HYDROGUI/HYDROGUI_Module.cxx
+++ b/src/HYDROGUI/HYDROGUI_Module.cxx
@@ -85,7 +85,10 @@
 #include <SVTK_ViewModel.h>
 #include <SVTK_ViewWindow.h>
 #include <SVTK_Selector.h>
-#include <SVTK_RenderWindowInteractor.h>
+#include <vtkRenderWindowInteractor.h>
+#include <vtkRenderer.h>
+#include <vtkWorldPointPicker.h>
+#include <vtkCamera.h>
 
 #include <OCCViewer_ViewPort3d.h>
 
@@ -101,6 +104,8 @@
 #include <QMouseEvent>
 #include <QStatusBar>
 
+const double LOCAL_SELECTION_TOLERANCE = 0.0001;
+
 static int ViewManagerId = 0;
 
 extern "C" HYDRO_EXPORT CAM_Module* createModule()
@@ -1439,6 +1444,8 @@ void HYDROGUI_Module::onMouseMove( SUIT_ViewWindow* theViewWindow, QMouseEvent*
 {
   OCCViewer_ViewWindow* anOCCViewWindow = 
     dynamic_cast<OCCViewer_ViewWindow*>(theViewWindow);
+  bool doShow = false;
+  gp_Pnt aPnt;
   if ( anOCCViewWindow ) {
     // Get the selected point coordinates
     OCCViewer_ViewPort3d* aViewPort = anOCCViewWindow->getViewPort();
@@ -1446,38 +1453,68 @@ void HYDROGUI_Module::onMouseMove( SUIT_ViewWindow* theViewWindow, QMouseEvent*
       return;
     }
 
-    gp_Pnt aPnt = CurveCreator_Utils::ConvertClickToPoint( theEvent->x(), theEvent->y(), 
+    aPnt = CurveCreator_Utils::ConvertClickToPoint( theEvent->x(), theEvent->y(), 
                                                            aViewPort->getView() );
-    // Show the coordinates in the status bar
-    SUIT_Desktop* aDesktop = getApp()->desktop();
-    if ( aDesktop && aDesktop->statusBar() ) {
-      QString aX = HYDROGUI_Tool::GetCoordinateString( aPnt.X() );
-      QString anY = HYDROGUI_Tool::GetCoordinateString( aPnt.Y() );
-      aDesktop->statusBar()->showMessage( tr("COORDINATES_INFO").arg( aX ).arg( anY ) );
-    }
+    doShow = true;
   } 
   else
   {
     SVTK_ViewWindow* aViewWindow = 
       dynamic_cast<SVTK_ViewWindow*>(theViewWindow);
     if ( aViewWindow ) {
-      // Get the selected point coordinates
-      double aCoords[3];
-      SVTK_RenderWindowInteractor* anInteractor = aViewWindow->GetInteractor();
-      if ( anInteractor )
+      vtkRenderer* aRen = aViewWindow->getRenderer();
+      if ( aRen )
       {
-        //TODO: Use a WorldPicker to get current coords
-        //anInteractorStyle->ComputeDisplayToWorld( theEvent->x(), theEvent->y(), 0, aCoords );
-        aCoords[0] = theEvent->x();
-        aCoords[1] = theEvent->y();
-        // Show the coordinates in the status bar
-        SUIT_Desktop* aDesktop = getApp()->desktop();
-        if ( aDesktop && aDesktop->statusBar() ) {
-          QString aX = HYDROGUI_Tool::GetCoordinateString( aCoords[0] );
-          QString anY = HYDROGUI_Tool::GetCoordinateString( aCoords[1] );
-          aDesktop->statusBar()->showMessage( tr("COORDINATES_INFO").arg( aX ).arg( anY ) );
+        vtkCamera* aCamera = aRen->GetActiveCamera();
+        double* aNormal = aCamera->GetViewPlaneNormal();
+        int event_x, event_y;
+        vtkRenderWindowInteractor* anInteractor = aViewWindow->getInteractor();
+        if ( anInteractor )
+        {
+          anInteractor->GetLastEventPosition(event_x, event_y);
+          // Use a WorldPicker to get current coords
+          myPicker->Pick( event_x, event_y, 0, aRen );
+          double* aCoords = myPicker->GetPickPosition();
+          /////////////////////// Use the same algorithm as for OCC
+          double X, Y, Z;
+          double aXp, aYp, aZp;
+          double Vx, Vy, Vz;
+          X = aCoords[0];
+          Y = aCoords[1];
+          Z = aCoords[2];
+          Vx = aNormal[0];
+          Vy = aNormal[1];
+          Vz = aNormal[2];
+          Standard_Real aPrec = LOCAL_SELECTION_TOLERANCE;
+          if ( fabs( Vz ) > aPrec ) {
+            double aT = -Z/Vz;
+            aXp = X + aT*Vx;
+            aYp = Y + aT*Vy;
+            aZp = Z + aT*Vz;
+          }
+          else { // Vz = 0 - the eyed plane is orthogonal to Z plane - XOZ, or YOZ
+            aXp = aYp = aZp = 0;
+            if ( fabs( Vy ) < aPrec ) // Vy = 0 - the YOZ plane
+              aYp = Y;
+            else if ( fabs( Vx ) < aPrec ) // Vx = 0 - the XOZ plane
+              aXp = X;
+          }
+          /////////////////////////
+          doShow = true;
+          aPnt.SetX( aXp );
+          aPnt.SetY( aYp );
         }
       }
     } 
   }
+  if ( doShow )
+  {
+    // Show the coordinates in the status bar
+    SUIT_Desktop* aDesktop = getApp()->desktop();
+    if ( aDesktop && aDesktop->statusBar() ) {
+      QString aX = HYDROGUI_Tool::GetCoordinateString( aPnt.X() );
+      QString anY = HYDROGUI_Tool::GetCoordinateString( aPnt.Y() );
+      aDesktop->statusBar()->showMessage( tr("COORDINATES_INFO").arg( aX ).arg( anY ) );
+    }
+  }
 }
\ No newline at end of file
diff --git a/src/HYDROGUI/HYDROGUI_Module.h b/src/HYDROGUI/HYDROGUI_Module.h
index a0b91265..a51ef9d2 100644
--- a/src/HYDROGUI/HYDROGUI_Module.h
+++ b/src/HYDROGUI/HYDROGUI_Module.h
@@ -29,11 +29,14 @@
 
 #include <QEvent>
 
+#include <vtkNew.h>
+
 class QGraphicsSceneMouseEvent;
 
 class GraphicsView_Viewer;
 class OCCViewer_Viewer;
 class SVTK_Viewer;
+class vtkWorldPointPicker;
 
 class SUIT_ViewWindow;
 class SUIT_ViewManager;
@@ -237,6 +240,7 @@ private:
 
   ViewId2ListOfShapes             myShapesMap;
   ViewId2ListOfVTKPrs             myVTKPrsMap;
+  vtkNew<vtkWorldPointPicker>     myPicker;
 
   bool                            myIsUpdateEnabled;
 
-- 
2.39.2