added perspective visualization

openglcanvas.cpp

@@ -425,7 +425,7 @@ void OpenGLCanvas::vertex_transformation(float *positions, int m, int n, float c
             lambda=atan2f(x,-z)/CONST_PI_F;
             phi=asinf(y)/CONST_PI_2_F;
 
-            if (visualization=="Moebius"){
+            if (visualization=="Moebius" || visualization=="Perspective"){
                 u = x/(-z);
                 v = y/(-z);
                 positions[3*(j+i*n)] = u/extent;
@@ -535,7 +535,7 @@ float OpenGLCanvas::calculate_extent(float fov_rads){
     x=(4.f*u)/(u*u+v*v+4.f);
     y=(4.f*v)/(u*u+v*v+4.f);
     z=(u*u+v*v-4.f)/(u*u+v*v+4.f);
-    if (visualization=="Moebius"){
+    if (visualization=="Moebius" || visualization=="Perspective"){
         u=x/(-z);
         v=y/(-z);
     }
@@ -774,7 +774,7 @@ void OpenGLCanvas::paintGL(){
     // defining transformation parameters (that will be passed to the vertex shader)
     float extent=calculate_extent(fov_rads);
     float vis_mode=.0f;
-    if (visualization=="Moebius") vis_mode=1.f;
+    if (visualization=="Moebius" || visualization=="Perspective") vis_mode=1.f;
     else if (visualization=="3D Sphere") vis_mode=2.f;
     else if (visualization=="Equi-Rectangular") vis_mode=3.f;
     else if (visualization=="Stereographic") vis_mode=4.f;

panowindow1.ui

@@ -192,6 +192,11 @@
        <string>Equi-Rectangular</string>
       </property>
      </item>
+     <item>
+      <property name="text">
+       <string>Perspective</string>
+      </property>
+     </item>
      <item>
       <property name="text">
        <string>Stereographic</string>
@@ -199,17 +204,17 @@
      </item>
      <item>
       <property name="text">
-       <string>Mercator</string>
+       <string>Orthographic</string>
       </property>
      </item>
      <item>
       <property name="text">
-       <string>Zorin-Barr</string>
+       <string>Mercator</string>
       </property>
      </item>
      <item>
       <property name="text">
-       <string>Orthographic</string>
+       <string>Zorin-Barr</string>
       </property>
      </item>
     </widget>