/* The current point */
float current_x = 0.0, current_y = 0.0 ;
+/* Signals when a glClear is needed */
+static GLboolean needClear = GL_TRUE;
+
static void draw_level ( int num, double m00, double m01, double m10, double m11, double n0, double n1 )
{
/* Draw a fractal transformed by "M", "N" as passed in */
static void
Display(void)
{
+ if (needClear) {
+ glClear(GL_COLOR_BUFFER_BIT);
+ needClear = GL_FALSE;
+ }
+
/* the curve */
glPushMatrix();
glScalef(2.5, 2.5, 2.5);
glPopMatrix();
- // glutSwapBuffers(); /* Should NOT be here... This is a Single-Buffered Program! */
+ glFlush();
glutPostRedisplay(); /* Needed so that this function will be called again */
}
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
ar = (float) width / (float) height;
- glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);
+ if( ar > 1 )
+ glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);
+ else
+ glFrustum(-1.0, 1.0, -1/ar, 1/ar, 2.0, 100.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
xwin = -1.0 ;
ywin = 0.0 ;
glTranslatef(xwin, ywin, -5.0);
+ needClear = GL_TRUE;
}
static void
break ;
}
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ needClear = GL_TRUE;
glutPostRedisplay();
}
break ;
}
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ needClear = GL_TRUE;
glutPostRedisplay();
}
/* Read the window title */
fgets ( inputline, 256, fptr ) ;
+ /* We assume here that this line will not exceed 79 characters plus a
+ newline (window_title is 80 characters long). That'll cause a buffer
+ overflow. For a simple program like this, though, we're letting it
+ slide!
+ */
sscanf ( inputline, "%[a-zA-Z0-9!@#$%^&*()+=/\\_-\" ]", window_title ) ;
/* Read a comment line */
{
int fractal_window ;
- if ( argc > 1 )
- readConfigFile ( argv[1] ) ;
- else
- readConfigFile ( "fractals.dat" ) ;
+ glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE );
- glutInit(&argc, argv);
glutInitWindowSize(500, 250);
glutInitWindowPosition ( 140, 140 ) ;
+ glutInit(&argc, argv);
- glutInitDisplayMode(GLUT_RGB | GLUT_SINGLE | GLUT_DEPTH);
+ if ( argc > 1 )
+ readConfigFile ( argv[1] ) ;
+ else
+ readConfigFile ( "fractals.dat" ) ;
fractal_window = glutCreateWindow( window_title );
glClearColor(1.0, 1.0, 1.0, 1.0);
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
-
glutReshapeFunc(Reshape);
glutKeyboardFunc(Key);
glutSpecialFunc(Special);