main.cpp

Go to the documentation of this file.

#include <iostream>

#include <GL/glut.h>

GLfloat mainspin=0.0;

void mainInit()
{
  glClearColor(0.0,0.0,0.0,0.0);
  glShadeModel(GL_FLAT);
}

void mainDisplay()
{
  glClear(GL_COLOR_BUFFER_BIT);
  glPushMatrix();

  glRotatef(mainspin,0.0,0.0,1.0);
  glColor3f(1.0,0.0,0.0);

  glBegin(GL_TRIANGLES);

  glVertex2f(-0.5,0.0);
  glVertex2f(0.0,1.0);
  glVertex2f(0.5,0.0);

  glEnd();

  glPopMatrix();
  glutSwapBuffers();
}

void mainReshape(int w, int h)
{
  glViewport(0,0,(GLsizei)w,(GLsizei)h);
  glMatrixMode(GL_PROJECTION);
  glLoadIdentity();
  glOrtho(-1.0,1.0,-1.0,1.0,-1.0,1.0);
  glMatrixMode(GL_MODELVIEW);
  glLoadIdentity();
}

void mainAnimate()
{
  mainspin += 0.1;
  if (mainspin >360.0)
    mainspin -= 360.0;

  glutPostRedisplay();
}


int main( int argc, char** argv)
{
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
  glutInitWindowSize(250,250);

  glutCreateWindow(argv[0]);
  mainInit();

  glutDisplayFunc(mainDisplay);
  glutReshapeFunc(mainReshape);
  glutIdleFunc(mainAnimate);

  glutMainLoop();
  return 0;
}