allow 2d plainview to be moved using meta key

libsrc/meshing/meshing2.cpp

@@ -18,7 +18,7 @@ namespace netgen
 //   // static int geomtrig;
 //   //static const char * rname;
 //   static int cntelem, trials, nfaces;
-   static int oldnl;
+//   static int oldnl;
 //   static int qualclass;
 
 
@@ -257,7 +257,8 @@ namespace netgen
     auto &loclines = *loclinesptr;
     vssurfacemeshing.loclinesptr = loclinesptr;
     int cntelem = 0, trials = 0, nfaces = 0;
-    oldnl = 0;
+    int oldnl = 0;
+    vssurfacemeshing.oldnl = oldnl;
     int qualclass;
 
 
@@ -523,6 +524,7 @@ namespace netgen
 	  {
 	    oldnp = locpoints.Size();
 	    oldnl = loclines.Size();
+            vssurfacemeshing.oldnl = oldnl;
 	  
 	    if (debugflag)
 	      (*testout) << "define new transformation" << endl;
@@ -1461,6 +1463,7 @@ namespace netgen
 		  (*testout) << adfront.GetGlobalIndex (pindex.Get(i)) << endl;
 
 		(*testout) << "old number of lines = " << oldnl << endl;
+                vssurfacemeshing.oldnl = oldnl;
 		for (int i = 1; i <= loclines.Size(); i++)
 		  {
 		    (*testout) << "line ";
@@ -1758,8 +1761,6 @@ namespace netgen
     float mat_col2d[] = { 1, 1, 1, 1 };
     glMaterialfv (GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, mat_col2d);
   
-    double scalex = 0.1, scaley = 0.1;
-
     glBegin (GL_LINES);
     for (int i = 1; i <= loclines.Size(); i++)
       {
@@ -1776,8 +1777,8 @@ namespace netgen
 	    Point2d p2 = plainpoints.Get(pi2);
 	  
 	    glBegin (GL_LINES);
-	    glVertex3f (scalex * p1.X(), scaley * p1.Y(), -5);
-	    glVertex3f (scalex * p2.X(), scaley * p2.Y(), -5);
+	    glVertex3f (scalex * p1.X() + shiftx, scaley * p1.Y() + shifty, -5);
+	    glVertex3f (scalex * p2.X() + shiftx, scaley * p2.Y() + shifty, -5);
 	    glEnd();
 	  }
       }
@@ -1789,7 +1790,7 @@ namespace netgen
     for (int i = 1; i <= plainpoints.Size(); i++)
       {
 	Point2d p = plainpoints.Get(i);
-	glVertex3f (scalex * p.X(), scaley * p.Y(), -5);
+	glVertex3f (scalex * p.X() + shiftx, scaley * p.Y() + shifty, -5);
       }
     glEnd();
 

libsrc/visualization/mvdraw.cpp

@@ -758,9 +758,26 @@ namespace netgen
   }
 
 
+  void VisualSceneSurfaceMeshing::MouseMove(int oldx, int oldy,
+                                            int newx, int newy,
+                                            char mode)
+  {
+    double fac = 0.001;
+    if(mode == 'M')
+      {
+        shiftx += fac * (newx - oldx);
+        shifty += fac * (oldy - newy);
+        return;
+      }
+    else if(mode == 'Z')
+      {
+        scalex *= (1 - fac * (newy - oldy));
+        scaley *= (1 - fac * (newy - oldy));
+        return;
+      }
     
-
-
+    VisualScene::MouseMove(oldx, oldy, newx, newy, mode);
+  }
 
 
 #ifdef PARALLELGL

libsrc/visualization/mvdraw.hpp

@@ -52,7 +52,7 @@ namespace netgen
     DLL_HEADER void ArbitraryRotation (const NgArray<double> & alpha, const NgArray<Vec3d> & vec);
     DLL_HEADER void ArbitraryRotation (const double alpha, const Vec3d & vec);
 
-    DLL_HEADER void MouseMove(int oldx, int oldy,
+    DLL_HEADER virtual void MouseMove(int oldx, int oldy,
                                       int newx, int newy,
                                       char mode);
 
@@ -95,16 +95,20 @@ namespace netgen
 
   class VisualSceneSurfaceMeshing : public VisualScene
   {
+    double scalex = 1., scaley = 1., shiftx = 0., shifty = 0.;
   public:
     shared_ptr<NgArray<Point3d>> locpointsptr;
     shared_ptr<NgArray<INDEX_2>> loclinesptr;
     shared_ptr<NgArray<Point2d>> plainpointsptr;
+    int oldnl;
     bool clearptr;
     VisualSceneSurfaceMeshing ();
     virtual ~VisualSceneSurfaceMeshing ();
 
-    virtual void BuildScene (int zoomall = 0);
-    virtual void DrawScene ();
+    void BuildScene (int zoomall = 0) override;
+    void DrawScene () override;
+    void MouseMove(int oldx, int oldy, int newx, int newy,
+                   char mode) override;
   };
 
 

ng/drawing.tcl

@@ -81,6 +81,18 @@ if { $toglok == 1} {
 	.ndraw render
 	set oldmousex %x; set oldmousey %y;
     }
+    
+    bind .ndraw <Alt-B2-Motion> {
+        Ng_MouseMove $oldmousex $oldmousey %x %y Move2d
+        .ndraw render
+        set oldmousex %x; set oldmousey %y;
+    }
+    
+    bind .ndraw <Alt-B3-Motion> {
+        Ng_MouseMove $oldmousex $oldmousey %x %y Zoom2d
+        .ndraw render
+        set oldmousex %x; set oldmousey %y;
+    }
 }
 
 

ng/drawing_togl17.tcl

@@ -54,6 +54,18 @@ if {[catch {togl .ndraw -width 400 -height 300  -rgba true -double true -depth t
 	.ndraw render
 	set oldmousex %x; set oldmousey %y;
     }
+    
+    bind .ndraw <Alt-B2-Motion> {
+        Ng_MouseMove $oldmousex $oldmousey %x %y Move2d
+        .ndraw render
+        set oldmousex %x; set oldmousey %y;
+    }
+    
+    bind .ndraw <Alt-B3-Motion> {
+        Ng_MouseMove $oldmousex $oldmousey %x %y Zoom2d
+        .ndraw render
+        set oldmousex %x; set oldmousey %y;
+    }
 }
 
 

ng/onetcl.cpp

@@ -3373,6 +3373,16 @@ const char * ngscript[] = {""
 ,".ndraw render\n"
 ,"set oldmousex %x; set oldmousey %y;\n"
 ,"}\n"
+,"bind .ndraw <Alt-B2-Motion> {\n"
+,"Ng_MouseMove $oldmousex $oldmousey %x %y Move2d\n"
+,".ndraw render\n"
+,"set oldmousex %x; set oldmousey %y;\n"
+,"}\n"
+,"bind .ndraw <Alt-B3-Motion> {\n"
+,"Ng_MouseMove $oldmousex $oldmousey %x %y Zoom2d\n"
+,".ndraw render\n"
+,"set oldmousex %x; set oldmousey %y;\n"
+,"}\n"
 ,"}\n"
 ,"proc popupcheckredraw { vari { x 0 } } {\n"
 ,"upvar $vari varname\n"