From: ouv <ouv@opencascade.com>
Date: Thu, 1 Dec 2005 15:49:56 +0000 (+0000)
Subject: Calculation of the "View to Display" coordinates transformation coefficient.
X-Git-Tag: TG-D5-38-2003_D2005-20-12~79
X-Git-Url: http://git.salome-platform.org/gitweb/?a=commitdiff_plain;h=4e10e5809d9b08a70d18da4c04b2c9a8b93545ba;p=modules%2Fvisu.git

Calculation of the "View to Display" coordinates transformation coefficient.
---

diff --git a/src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx b/src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx
index 87ce9597..f4640aee 100755
--- a/src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx
+++ b/src/PIPELINE/VISU_OpenGLPointSpriteMapper.cxx
@@ -684,6 +684,21 @@ void VISU_OpenGLPointSpriteMapper::DrawPoints(vtkPoints *p,
   if( this->UsePointSprites )
     this->InitPointSprites();
 
+  float p1[3], p2[3];
+
+  ren->SetViewPoint( 0.0, 0.0, 0.0 );
+  ren->ViewToDisplay();
+  ren->GetDisplayPoint( p1 );
+
+  ren->SetViewPoint( 1.0, 1.0, 1.0 );
+  ren->ViewToDisplay();
+  ren->GetDisplayPoint( p2 );
+
+  float coefficient = sqrt( pow( p2[0] - p1[0], 2 ) + pow( p2[1] - p1[1], 2 ) ) / sqrt( 2 );
+  //cout << p1[0] << " " << p1[1] << " " << p1[2] << endl;
+  //cout << p2[0] << " " << p2[1] << " " << p2[2] << endl;
+  //cout << "ZOOM  : " << coefficient << endl;
+
   glPointSize( this->DefaultPointSize );
 
   vglUseProgramObjectARB( this->VertexProgram );
@@ -734,7 +749,7 @@ void VISU_OpenGLPointSpriteMapper::DrawPoints(vtkPoints *p,
     else
       size = this->PointSpriteSize;
 
-    aVertex[i].hue = 1000.0 * this->AverageCellSize * this->PointSpriteMagnification * size;
+    aVertex[i].hue =  coefficient * this->AverageCellSize * this->PointSpriteMagnification * size;
   }
 
   GLuint aBufferObjectID = 0;