Add a function to render polymarkers from float array and TAttMarker.

diff --git a/EVE/Reve/GLUtilNS.cxx b/EVE/Reve/GLUtilNS.cxx
new file mode 100644 (file)
index 0000000..f446dbc
--- /dev/null
+++ b/EVE/Reve/GLUtilNS.cxx
@@ -0,0 +1,146 @@
+#include "GLUtilNS.h"
+
+#include <TAttMarker.h>
+#include <GL/gl.h>
+
+namespace GLUtilNS {
+
+void RenderPolyMarkers(TAttMarker& marker, Float_t* p, Int_t n,
+                      Bool_t selection, Bool_t sec_selection)
+{
+  // Store attributes GL_POINT_BIT and GL_LINE_BIT before call this function !
+
+  Int_t s = marker.GetMarkerStyle(); 
+  if (s == 2 || s == 3 || s == 5 || s == 28)
+    RenderCrosses(marker, p, n, sec_selection); 
+  else
+    RenderPoints(marker, p, n, selection, sec_selection); 
+}
+
+//______________________________________________________________________________
+void RenderPoints(TAttMarker& marker, Float_t* p, Int_t n,
+                 Bool_t selection, Bool_t sec_selection)
+{
+  // Render markers as circular or square points.
+  {
+    Int_t ms = marker.GetMarkerStyle();
+    Float_t size = 5*marker.GetMarkerSize();
+    if (ms == 4 || ms == 20 || ms == 24) 
+    {
+      if (ms == 4 || ms == 24)
+       glEnable(GL_BLEND);
+      glEnable(GL_POINT_SMOOTH);
+    } else 
+    {
+      glDisable(GL_POINT_SMOOTH);
+      if      (ms == 1) size = 1;
+      else if (ms == 6) size = 2;
+      else if (ms == 7) size = 3;
+    }
+    glPointSize(size);
+   
+    // During selection extend picking region for large point-sizes.
+    static const Int_t sPickRadius = 3; // Hardcoded also in TGLViewer::RequestSelect()
+    Bool_t changePM = kFALSE;
+    if (selection && size > sPickRadius) 
+    {
+      changePM = kTRUE;
+      glMatrixMode(GL_PROJECTION);
+      glPushMatrix();
+      Float_t pm[16];
+      glGetFloatv(GL_PROJECTION_MATRIX, pm);
+      Float_t scale = (Float_t) sPickRadius / size;
+      for (Int_t i=0; i<=12; i+=4) {
+       pm[i] *= scale; pm[i+1] *= scale;
+      }
+      glLoadMatrixf(pm);
+    }
+
+    if (sec_selection) 
+    {
+      glPushName(0);
+      for (Int_t i=0; i<n; ++i, p+=3) 
+      {
+       glLoadName(i);
+       glBegin(GL_POINTS);
+       glVertex3fv(p);
+       glEnd();
+      }
+      glPopName();
+    } 
+    else 
+    {
+      glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT);
+      glVertexPointer(3, GL_FLOAT, 0, p);
+      glEnableClientState(GL_VERTEX_ARRAY);
+      { // Circumvent bug in ATI's linux drivers.
+       Int_t nleft = n;
+       Int_t ndone = 0;
+       const Int_t maxChunk = 8192;
+       while (nleft > maxChunk) 
+       {
+         glDrawArrays(GL_POINTS, ndone, maxChunk);
+         nleft -= maxChunk;
+         ndone += maxChunk;
+       }
+       glDrawArrays(GL_POINTS, ndone, nleft);
+      }
+      glPopClientAttrib();
+    }
+
+    if (changePM) 
+    {
+      glPopMatrix();
+      glMatrixMode(GL_MODELVIEW);
+    }
+  }
+}
+
+//______________________________________________________________________________
+void RenderCrosses(TAttMarker& marker, Float_t* p, Int_t n,
+                  Bool_t sec_selection)
+{
+  // Render markers as crosses.
+  //
+  if (marker.GetMarkerStyle() == 28) 
+  {
+    glEnable(GL_BLEND);
+    glEnable(GL_LINE_SMOOTH);
+    glLineWidth(2);
+  } 
+  else 
+  {
+    glDisable(GL_LINE_SMOOTH);
+  }
+
+  // cross dim
+  const Float_t  d = marker.GetMarkerSize();
+  if (sec_selection) 
+  {
+    glPushName(0);
+    for (Int_t i=0; i<n; ++i, p+=3) 
+    {
+      glLoadName(i);
+      glBegin(GL_LINES);
+      glVertex3f(p[0]-d, p[1], p[2]); glVertex3f(p[0]+d, p[1], p[2]);
+      glVertex3f(p[0], p[1]-d, p[2]); glVertex3f(p[0], p[1]+d, p[2]);
+      glVertex3f(p[0], p[1], p[2]-d); glVertex3f(p[0], p[1], p[2]+d);
+      glEnd();
+    }
+    glPopName();
+  } 
+  else 
+  {
+    glBegin(GL_LINES);
+    for (Int_t i=0; i<n; ++i, p+=3) 
+    {
+      glVertex3f(p[0]-d, p[1], p[2]); glVertex3f(p[0]+d, p[1], p[2]);
+      glVertex3f(p[0], p[1]-d, p[2]); glVertex3f(p[0], p[1]+d, p[2]);
+      glVertex3f(p[0], p[1], p[2]-d); glVertex3f(p[0], p[1], p[2]+d);
+    }
+    glEnd();
+  }
+}
+
+/**************************************************************************/
+} // end namespace GLUtilNS

diff --git a/EVE/Reve/GLUtilNS.h b/EVE/Reve/GLUtilNS.h
index 6790be5995716579ce32fa90a0d10a372f341635..d31ff8ebc0cd22ee90d4189648332c5d61ba3987 100644 (file)
--- a/EVE/Reve/GLUtilNS.h
+++ b/EVE/Reve/GLUtilNS.h
@@ -3,6 +3,9 @@
 #ifndef __CINT__
 
 #include <TGLIncludes.h>
+#include <TObject.h>
+
+class TAttMarker;
 
 namespace GLUtilNS
 {
@@ -45,6 +48,15 @@ public:
   { if(fFlip) fFoo(fState); }
 };
 
+
+void RenderPolyMarkers(TAttMarker& marker, Float_t* p, Int_t n, 
+                      Bool_t selection, Bool_t sec_selection);
+
+void RenderPoints(TAttMarker& marker, Float_t* p, Int_t n,
+                 Bool_t selection, Bool_t sec_selection);
+
+void RenderCrosses(TAttMarker& marker, Float_t* p, Int_t n, Bool_t sec_selection);
+
 }
 
 #endif