X-Git-Url: https://git.ucc.asn.au/?a=blobdiff_plain;f=scene.c;h=4fea15a9586f97fff5809ab65c8f86e35d5a0738;hb=1fbbf873ce0993536eafe9f9f01eb0ca24fececa;hp=21b3933802ad8f51c70e79c27fdc50f8818014e9;hpb=817524e0f062d8f652f4dd6efa375bb97a64f2af;p=atyndall%2Fcits2231.git

diff --git a/scene.c b/scene.c
index 21b3933..4fea15a 100644
--- a/scene.c
+++ b/scene.c
@@ -463,13 +463,31 @@ void makeMenu() {
  * @param width New width
  * @param height New height
  */
-void windowReshape(int width, int height) {
-  glViewport(0, 0, (GLsizei)width, (GLsizei)height);
+void windowReshape(int w, int h) {
+  /*glViewport(0, 0, (GLsizei)width, (GLsizei)height);
   printf("Width: %d, height: %d\n", width, height);
   glMatrixMode(GL_PROJECTION);
   glLoadIdentity();
-  gluPerspective(60, 1, 0.1, 1000.0);
+  gluPerspective( 60 * ((GLfloat)height/(GLfloat)width), (GLfloat)width/(GLfloat)height, 0.1, 1000.0);
   glMatrixMode(GL_MODELVIEW);
+
+  GLdouble near = 0.1;
+  GLdouble far = 1000.0;
+  GLdouble a = (GLfloat)height/(GLfloat)width;
+  GLdouble fov = 60;
+  glFrustum( -a*near*tan(fov/2),  a*near*tan(fov/2),  -a*near*tan(fov/2),  a*near*tan(fov/2), near, far  )*/
+  glViewport(0, 0, (GLsizei) w, (GLsizei) h); // what's GLsizei? Why is it called inside glViewPort?
+   glMatrixMode(GL_PROJECTION); // is it necessary to reset the projection matrix?
+   glLoadIdentity();
+   if (w <= h)  // is this calculation universal, could I use it on another program?
+      glOrtho(-5.0, 5.0, -5.0*(GLfloat)h/(GLfloat)w,
+               5.0*(GLfloat)h/(GLfloat)w, -5.0, 5.0);
+
+   else
+      glOrtho(-5.0*(GLfloat)w/(GLfloat)h,
+               5.0*(GLfloat)w/(GLfloat)h, -5.0, 5.0, -5.0, 5.0);
+   glMatrixMode(GL_MODELVIEW); // why do I set to GL_MODELVIEW at the end?
+   glLoadIdentity(); // why does it get a reset?
 }
 
 /**
@@ -535,5 +553,11 @@ int main(int argc, char **argv) {
     glutMouseFunc(mouse);
 
     makeMenu();
+
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    gluPerspective( 60, 1, 0.1, 1000.0);
+    glMatrixMode(GL_MODELVIEW);
+
     glutMainLoop();
 }