Index: v3d_main/v3d/v3d_core.cpp
===================================================================
--- v3d_main/v3d/v3d_core.cpp	(revision 1965)
+++ v3d_main/v3d/v3d_core.cpp	(working copy)
@@ -1528,12 +1528,21 @@
 		return roiPolygon.boundingRect();
 }
 
+QPointF	 XFormView::mouseEventToImageCoords(const QPoint& p)
+{
+	return	QPointF(
+		double((p.x()-curDisplayCenter.x()))/(disp_scale*m_scale)+pixmap.width()/2.0+0.5,
+		double((p.y()-curDisplayCenter.y()))/(disp_scale*m_scale)+pixmap.height()/2.0+0.5
+	);
+}
+
 void XFormView::mouseDoubleClickEvent(QMouseEvent * e)
 {
     if (!imgData)
 		return;
-
-    QPoint cp = e->pos()/disp_scale;
+		
+    QPoint cp = mouseEventToImageCoords(e->pos()).toPoint();
+    
 	int sx,sy,sz; //current selection location's x,y,z
 
 	switch(Ptype)
@@ -1696,21 +1705,23 @@
 	else
 	{
 #endif
+		QPoint	eImgCoords = mouseEventToImageCoords(e->pos()).toPoint();
+		
 		switch (Ptype)
 		{
 			case imgPlaneX:
-				emit focusZChanged(double((e->x()-curDisplayCenter.x()))/(disp_scale*m_scale)+pixmap.width()/2.0+0.5);
-				emit focusYChanged(double((e->y()-curDisplayCenter.y()))/(disp_scale*m_scale)+pixmap.height()/2.0+0.5);
+				emit focusZChanged(eImgCoords.x());
+				emit focusYChanged(eImgCoords.y());
 				break;
 
 			case imgPlaneY:
-				emit focusXChanged(double((e->x()-curDisplayCenter.x()))/(disp_scale*m_scale)+pixmap.width()/2.0+0.5);
-				emit focusZChanged(double((e->y()-curDisplayCenter.y()))/(disp_scale*m_scale)+pixmap.height()/2.0+0.5);
+				emit focusXChanged(eImgCoords.x());
+				emit focusZChanged(eImgCoords.y());
 				break;
 
 			case imgPlaneZ:
-				emit focusXChanged(double((e->x()-curDisplayCenter.x()))/(disp_scale*m_scale)+pixmap.width()/2.0+0.5);
-				emit focusYChanged(double((e->y()-curDisplayCenter.y()))/(disp_scale*m_scale)+pixmap.height()/2.0+0.5);
+				emit focusXChanged(eImgCoords.x());
+				emit focusYChanged(eImgCoords.y());
 				//qDebug()<<"x="<<e->x()<<"y="<<e->y()<<"disp_scale="<<disp_scale<<"m_scale="<<m_scale<<"curdispcenter.x="<<curDisplayCenter.x()<<"curdispcenter.y="<<curDisplayCenter.y();
 
 				break;
@@ -1725,14 +1736,12 @@
 
 void XFormView::mouseLeftButtonPressEvent(QMouseEvent *e) //080101
 {
+	
 	//reserved for future editing of the the pop-up menu
 	if (QApplication::keyboardModifiers()==Qt::ControlModifier)
 	{
-		QPoint cp = e->pos();
-
 		//add zoom-in support. by PHC 20101119
-		cp.setX(double((e->x()-curDisplayCenter.x()))/(disp_scale*m_scale)+pixmap.width()/2.0+0.5);
-		cp.setY(double((e->y()-curDisplayCenter.y()))/(disp_scale*m_scale)+pixmap.height()/2.0+0.5);
+		QPoint	cp = mouseEventToImageCoords(e->pos()).toPoint();
 
 		roiPolygon << cp;
 		update();
@@ -1747,11 +1756,7 @@
 	}
 	else if (b_moveCurrentLandmark==true && ind_landmarkToBeChanged>=0 && QApplication::keyboardModifiers()==Qt::ShiftModifier)
 	{
-		QPoint cp = e->pos(); ///(disp_scale*m_scale); //100909
-
-        //the following two lines are suggested by Carlos Becker, 111004. Apparently are duplicates of my code on 1733/1734 above. by PHC
-        cp.setX(double((e->x()-curDisplayCenter.x()))/(disp_scale*m_scale)+pixmap.width()/2.0+0.5);
-        cp.setY(double((e->y()-curDisplayCenter.y()))/(disp_scale*m_scale)+pixmap.height()/2.0+0.5);
+		QPoint cp = mouseEventToImageCoords(e->pos()).toPoint();
         
 		int sx,sy,sz; //current selection location's x,y,z
 
Index: v3d_main/v3d/v3d_core.h
===================================================================
--- v3d_main/v3d/v3d_core.h	(revision 1965)
+++ v3d_main/v3d/v3d_core.h	(working copy)
@@ -514,6 +514,9 @@
 	void set_disp_width(int a) {disp_width = a;}
 	void set_disp_height(int a) {disp_height = a;}
 	void set_disp_scale(double a) {disp_scale = a; }
+	
+	/* Converts point from mouse event coordinates to image coordinates */
+	QPointF mouseEventToImageCoords(const QPoint& p);
 
     void mousePressEvent(QMouseEvent *e);
     void mouseLeftButtonPressEvent(QMouseEvent *e);