/*
 *  lines2.c
 *  This program demonstrates geometric primitives and
 *  their attributes.
 */
#ifdef __APPLE__
  #include <GLUT/glut.h>
#else
  #include <GL/glut.h>
#endif
#include <stdlib.h>

#define drawOneLine(x1,y1,x2,y2)  glBegin(GL_LINES);  \
   glVertex2f ((x1),(y1)); glVertex2f ((x2),(y2)); glEnd();

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

void display(void)
{
   int i;

   glClear (GL_COLOR_BUFFER_BIT);

   glColor3f (1.0, 1.0, 1.0);
   drawOneLine (50.0, 125.0, 150.0, 125.0);

   glColor3f(1.0,  1., 0.);
   glPushMatrix();
   glTranslatef(50., 125., 0.);
   glRotatef(-45, 0, 0, 1);
   glTranslatef(-50., -125., 0.);
   drawOneLine (0.0, 0.0, 150.0, 125.0);
   glPopMatrix();

   glColor3f(1.0,  0., 0.);
   glPushMatrix();
   glRotatef(-45, 0, 0, 1);
   drawOneLine (50.0, 125.0, 150.0, 125.0);
   glPopMatrix();

   glFlush();
}

void reshape (int w, int h)
{
   glViewport (0, 0, (GLsizei) w, (GLsizei) h);
   glMatrixMode (GL_PROJECTION);
   glLoadIdentity ();
   gluOrtho2D (0.0, (GLdouble) w, 0.0, (GLdouble) h);
}

/* ARGSUSED1 */
void keyboard(unsigned char key, int x, int y)
{
   switch (key) {
      case 27:
         exit(0);
         break;
   }
}

int main(int argc, char** argv)
{
   glutInit(&argc, argv);
   glutInitDisplayMode (GLUT_SINGLE | GLUT_RGB);
   glutInitWindowSize (400, 400); 
   glutInitWindowPosition (100, 100);
   glutCreateWindow (argv[0]);
   init ();
   glutDisplayFunc(display); 
   glutReshapeFunc(reshape);
   glutKeyboardFunc(keyboard);
   glutMainLoop();
   return 0;
}