Upgraded visualization libraries

Major refactoring of color legend framework
Added discrete log color legend
p4#: 18989

VisualizationModules/LibViewing/cvfFixedSizeTransform.cpp

@@ -0,0 +1,102 @@
+//##################################################################################################
+//
+//   Custom Visualization Core library
+//   Copyright (C) 2011-2012 Ceetron AS
+//    
+//   This library is free software: you can redistribute it and/or modify 
+//   it under the terms of the GNU General Public License as published by 
+//   the Free Software Foundation, either version 3 of the License, or 
+//   (at your option) any later version. 
+//    
+//   This library is distributed in the hope that it will be useful, but WITHOUT ANY 
+//   WARRANTY; without even the implied warranty of MERCHANTABILITY or 
+//   FITNESS FOR A PARTICULAR PURPOSE.   
+//    
+//   See the GNU General Public License at <<http://www.gnu.org/licenses/gpl.html>> 
+//   for more details. 
+//
+//##################################################################################################
+
+#include "cvfBase.h"
+#include "cvfFixedSizeTransform.h"
+
+namespace cvf {
+
+
+
+//==================================================================================================
+///
+/// \class cvf::FixedSizeTransform
+/// \ingroup Viewing
+///
+/// Fixed size parts
+/// 
+//==================================================================================================
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+FixedSizeTransform::FixedSizeTransform()
+{
+    m_fixedPixelSizeModelUnits = 1.0;
+}
+
+
+//--------------------------------------------------------------------------------------------------
+/// Make the object a constant pixel size
+//--------------------------------------------------------------------------------------------------
+void FixedSizeTransform::updateWorldTransform(const cvf::Camera* camera)
+{
+    Transform::updateWorldTransform(camera);
+    
+    if (m_fixedPixelSizeModelUnits > 0.0)
+    {
+        cvf::Vec3d objectCenter(0,0,0);
+        objectCenter.transformPoint(m_worldMatrix);
+
+        double eyeDist = (objectCenter - camera->position())*camera->direction();
+
+        if (eyeDist > 0)
+        {
+            double scaleFactor = 1.0;
+
+            if (camera->projection() == Camera::PERSPECTIVE)
+            {
+                double nearPlane = camera->nearPlane();
+                double frontPlanePixelHeigth = camera->frontPlanePixelHeight();
+                scaleFactor = (fixedPixelSizeModelUnits()*frontPlanePixelHeigth*eyeDist)/nearPlane;
+            }
+            else
+            {
+                scaleFactor = camera->frontPlanePixelHeight();
+            }
+
+            Mat4d scaleMatrix = Mat4d::fromScaling(Vec3d(scaleFactor, scaleFactor, scaleFactor));
+            m_worldMatrix = m_worldMatrix*scaleMatrix;
+        }
+    }
+}
+
+
+//--------------------------------------------------------------------------------------------------
+/// Set the pixel size of a unit size in world coords
+/// E.g: Setting pixel size to 5 will make an object 1 units wide in WC 5 pixels
+///      or setting this to 0.2 will make a 50 unit size object 10 pixels
+//--------------------------------------------------------------------------------------------------
+void FixedSizeTransform::setFixedPixelSizeInModelUnits(double pixelSize)
+{
+    m_fixedPixelSizeModelUnits = pixelSize;
+}
+
+
+//--------------------------------------------------------------------------------------------------
+/// Return the pixel size of a unit size in world coords
+//--------------------------------------------------------------------------------------------------
+double FixedSizeTransform::fixedPixelSizeModelUnits() const
+{
+    return m_fixedPixelSizeModelUnits;
+}
+
+} // namespace cvf
+
+