zprtest Class Reference

Test zpr class. More...

#include <zprtest.h>

List of all members.

Public Member Functions
int	test01 (int argc, char **argv)
	Display axes at the origin.
void	test02 (int argc, char **argv)
	Extracting the frustrum from the projection matrix.
void	test03 (int argc, char **argv)
	Changing OpenGL's projection and having the change read back into zpr.
Static Public Member Functions
static void	keyboard (unsigned char key, int x, int y)
	Keyboard handler.
static void	display ()
	Display test.

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Detailed Description

Test zpr class.

Definition at line 12 of file zprtest.h.

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Member Function Documentation

void zprtest::display

(

)

[static]

Display test.

Definition at line 25 of file zprtest.cpp.

References glerrordisplay().

Referenced by test01(), test02(), and test03().

{
  // Drawing a coordinate system with cone pointers

  glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
  glPushMatrix();

glerrordisplay();

  glDisable(GL_LIGHTING);
  glBegin(GL_LINES);
    glColor3f(0,0,1);
    glVertex3f(0,0,0);
    glVertex3f(0,0,1);
    glColor3f(0,1,0);
    glVertex3f(0,0,0);
    glVertex3f(0,1,0);
    glColor3f(1,0,0);
    glVertex3f(0,0,0);
    glVertex3f(1,0,0);
  glEnd();

glerrordisplay();

  glEnable(GL_LIGHTING);
  // glutSolidCone(base_radius,length,base_verticies,cone_axis_verticies)

  // The colors RGB correspont to the XYZ axes

  glPushMatrix();
  // First Translate the coordinate system
    glTranslatef(1,0,0);
    glColor3f(1,0,0);

      // Pointing along the z-axis

      // Rotation is counter clockwise in the plane with y normal
      //     This gets us pointing along the x-axis
    glRotatef(90,0,1,0);

      //glTranslatef(1,0,0);
    glutSolidCone(.2,1.0,10,5);
  glPopMatrix();

glerrordisplay();

  glPushMatrix();
    glTranslatef(0,1,0);
    glColor3f(0,1,0);
    glRotatef(270,1,0,0);
    glutSolidCone(.2,1.0,10,5);
  glPopMatrix();

  glPushMatrix();
    // Already pointing along the z-axis
    glTranslatef(0,0,1);
    glColor3f(0,0,1);
    glutSolidCone(.2,1.0,10,5);
  glPopMatrix();

glerrordisplay();

  glutSwapBuffers();

  glPopMatrix();
}

void zprtest::keyboard	(	unsigned char	key,
		int	x,
		int	y
	)			[static]

Keyboard handler.

Definition at line 92 of file zprtest.cpp.

Referenced by test01(), test02(), and test03().

{
  switch (key)
  {
    case 27:
      exit(0);
      break;
  }
}

int zprtest::test01	(	int	argc,
		char **	argv
	)

Display axes at the origin.

Definition at line 126 of file zprtest.cpp.

References display(), keyboard(), and zpr::printInfo().

{
  glutInit(&argc, argv);
  glutInitDisplayMode
    (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
  int wx=800; 
  int wy=600;
  glutInitWindowSize(wx,wy);
  glutCreateWindow("Coordinate Axes");

  zpr zz;

  cout << "After construction." << endl;
  zz.printInfo();

  // Callbacks

  glutKeyboardFunc(zprtest::keyboard);
  glutDisplayFunc(zprtest::display);
  //glutIdleFunc(zpreval);

  glEnable(GL_NORMALIZE);

//  glScalef(0.25,0.25,0.25);
/*

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  //gluPerspective(65, (GLdouble)wx/(GLdouble)wy, .25, 10); 
 glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST);

  // COP - Center Of Projection
  // VRP - View Reference Point
  // VUP - View UP
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
  gluLookAt(
    0.0,0.0,0.0, 
    0.0,0.0,8.0, 
    0.0,1.0,0.0); 

  zz.update();
*/

  OpenGLinitialisation();

  // Never returns
  glutMainLoop();

  return 0;
}

void zprtest::test02	(	int	argc,
		char **	argv
	)

Extracting the frustrum from the projection matrix.

Definition at line 180 of file zprtest.cpp.

References zprGLmatrix::access(), display(), keyboard(), and SHOW.

{
  cout << "Starting up OpenGL." << endl;

  glutInit(&argc, argv);
  glutInitDisplayMode
    (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
  int wx=800; 
  int wy=600;
  glutInitWindowSize(wx,wy);
  glutCreateWindow("Coordinate Axes");
  zpr zz;
  
  //zpr::init(wx,wy);
  glutKeyboardFunc(zprtest::keyboard);
  glutDisplayFunc(zprtest::display);


  GLdouble pmatrix[16];

  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glGetDoublev(GL_PROJECTION_MATRIX,pmatrix);
  cout << "The identity matrix should be printed." << endl;
  GLdouble * p2 = & pmatrix[0];
  zprGLmatrix(p2).print();
  cout << endl;

  GLdouble left=-1.0;
  GLdouble right=1.0;
  GLdouble bottom=-0.5;
  GLdouble top=1.5;
  GLdouble zNear=1.0;
  GLdouble zFar=4.2;
  cout << SHOW(left) << endl;
  cout << SHOW(right) << endl;
  cout << SHOW(bottom) << endl;
  cout << SHOW(top) << endl;
  cout << SHOW(zNear) << endl;
  cout << SHOW(zFar) << endl;
  glFrustum(left,right,bottom,top,zNear,zFar);

  glGetDoublev(GL_PROJECTION_MATRIX,pmatrix);
  cout << "Calculate the view frustrum with OpenGL" << endl;
  zprGLmatrix(p2).print();
  cout << endl << endl;
  zprGLmatrix(p2).printTranspose();
  cout << endl;

  zprGLmatrix mat(p2);

  GLdouble a[6];
  a[0] = mat.access(0,0);
  a[1] = mat.access(1,1);
  a[2] = mat.access(0,2);
  a[3] = mat.access(1,2);
  a[4] = mat.access(2,2);
  a[5] = mat.access(2,3);
  cout << SHOW(a[0]) << endl;
  cout << SHOW(a[1]) << endl;
  cout << SHOW(a[2]) << endl;
  cout << SHOW(a[3]) << endl;
  cout << SHOW(a[4]) << endl;
  cout << SHOW(a[5]) << endl;

  GLdouble c0 = (1.0-a[4])/(1.0+a[4]);
  cout << SHOW(c0) << endl;
  GLdouble z0 = a[5]*(c0+1.0)*-0.5/c0;
  cout << SHOW(z0) << endl;
  GLdouble z1 = -c0*z0;
  cout << SHOW(z1) << endl;
  GLdouble x0 = z0*(a[2]-1.0)/a[0];
  cout << SHOW(x0) << endl;
  GLdouble x1 = (z0*2.0+a[0]*x0)/a[0];
  cout << SHOW(x1) << endl;
  GLdouble y0 = z0*(a[3]-1.0)/a[1];
  cout << SHOW(y0) << endl;
  GLdouble y1 = (z0*2.0+a[1]*y0)/a[1];
  cout << SHOW(y1) << endl;
}

void zprtest::test03	(	int	argc,
		char **	argv
	)

Changing OpenGL's projection and having the change read back into zpr.

Definition at line 262 of file zprtest.cpp.

References display(), keyboard(), zpr::printInfo(), zpr::readProjection(), and SHOW.

{
  cout << "Starting up OpenGL." << endl;

  glutInit(&argc, argv);
  glutInitDisplayMode
    (GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
  int wx=800; 
  int wy=600;
  glutInitWindowSize(wx,wy);
  glutCreateWindow("Coordinate Axes");

  zpr zz; 
  //zpr::init(wx,wy);

  glutKeyboardFunc(zprtest::keyboard);
  glutDisplayFunc(zprtest::display);



  cout << "printing out zpr's state." << endl;
  zz.printInfo();
/*
  cout << "zprtest03.cpp glFrustum(left,right,bottom,top,zNear,zFar)" << endl;
  cout << SHOW(left) << endl;
  cout << SHOW(right) << endl;
  cout << SHOW(bottom) << endl;
  cout << SHOW(top) << endl;
  cout << SHOW(zNear) << endl;
  cout << SHOW(zFar) << endl;
*/

/*
  cout << endl;
  cout << "zpr's current frustrum" << endl;
  zpr::printInfo();
*/
  cout << endl;

  printMatrixMode();

  cout << "Changing OpenGL's frustrum" << endl;

  {
    myglPushMatrixMode tmp;

    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    GLdouble x0=-1.0;
    GLdouble x1=1.0;
    GLdouble y0=-0.5;
    GLdouble y1=1.5;
    GLdouble z0=1.0;
    GLdouble z1=4.2;
    glFrustum(x0,x1,y0,y1,z0,z1);
    cout << SHOW(x0) << endl;
    cout << SHOW(x1) << endl;
    cout << SHOW(y0) << endl;
    cout << SHOW(y1) << endl;
    cout << SHOW(z0) << endl;
    cout << SHOW(z1) << endl;
    cout << "glFrustum(x0,x1,y0,y1,z0,z1);" << endl;

    cout << "Reading OpenGL's projection matrix." << endl;

    zz.readProjection();
  
    printMatrixMode();
  }
  cout << endl;

  printMatrixMode();
 
  cout << "zpr's current state" << endl;
  zz.printInfo();
  cout << endl;

}

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The documentation for this class was generated from the following files:

• zpr/zprtest.h
• zpr/zprtest.cpp