char window_title [ 80 ] ;
/* The amount the view is translated and scaled */
-float xwin = 0.0, ywin = 0.0 ;
-float scale_factor = 1.0 ;
+double xwin = 0.0, ywin = 0.0 ;
+double scale_factor = 1.0 ;
static void draw_level ( int num, double m00, double m01, double m10, double m11, double n0, double n1 )
{
double x1 = m00 * affine[i].statx + m01 * affine[i].staty + n0 ;
double y1 = m10 * affine[i].statx + m11 * affine[i].staty + n1 ;
- glVertex2f ( x0, y0 ) ;
- glVertex2f ( x1, y1 ) ;
+ glVertex2d ( x0, y0 ) ;
+ glVertex2d ( x1, y1 ) ;
x0 = x1 ;
y0 = y1 ;
static void
Display(void)
{
- glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+ glClear( GL_COLOR_BUFFER_BIT );
/* the curve */
glPushMatrix();
Reshape(int width, int height)
{
float ar;
- glViewport(0, 0, width, height);
- glMatrixMode(GL_PROJECTION);
- glLoadIdentity();
- ar = (float) width / (float) height;
- glFrustum(-ar, ar, -1.0, 1.0, 2.0, 100.0);
- glMatrixMode(GL_MODELVIEW);
+ glViewport ( 0, 0, width, height ) ;
+ glMatrixMode ( GL_PROJECTION ) ;
glLoadIdentity();
+ ar = (float) width / (float) height ;
+ 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);
+ glTranslated ( xwin, ywin, -5.0 ) ;
}
static void
Key(unsigned char key, int x, int y)
{
+ int need_redisplay = 1;
+
switch (key) {
case 27: /* Escape key */
- glutLeaveMainLoop ();
+ glutLeaveMainLoop () ;
break;
case '+' :
break ;
case '-' :
- if (num_levels > 0)
- --num_levels;
+ if ( num_levels > 0 )
+ --num_levels ;
break ;
case 'r' : case 'R' :
- glMatrixMode(GL_MODELVIEW);
+ glMatrixMode ( GL_MODELVIEW ) ;
glLoadIdentity();
xwin = -1.0 ;
ywin = 0.0 ;
- glTranslatef(xwin, ywin, -5.0);
-
+ glTranslated ( xwin, ywin, -5.0 ) ;
break ;
- }
- glutPostRedisplay();
+ default:
+ need_redisplay = 0;
+ break;
+ }
+ if (need_redisplay)
+ glutPostRedisplay();
}
static void
Special(int key, int x, int y)
{
+ int need_redisplay = 1;
+
switch (key) {
case GLUT_KEY_UP :
- glMatrixMode(GL_MODELVIEW);
+ glMatrixMode ( GL_MODELVIEW ) ;
ywin += 0.1 * scale_factor ;
- glTranslatef(0.0, 0.1 * scale_factor, 0.0);
+ glTranslated ( 0.0, 0.1 * scale_factor, 0.0 ) ;
break ;
case GLUT_KEY_DOWN :
- glMatrixMode(GL_MODELVIEW);
+ glMatrixMode ( GL_MODELVIEW ) ;
ywin -= 0.1 * scale_factor ;
- glTranslatef(0.0, -0.1 * scale_factor, 0.0);
+ glTranslated ( 0.0, -0.1 * scale_factor, 0.0 ) ;
break ;
case GLUT_KEY_LEFT :
- glMatrixMode(GL_MODELVIEW);
+ glMatrixMode ( GL_MODELVIEW ) ;
xwin -= 0.1 * scale_factor ;
- glTranslatef(-0.1 * scale_factor, 0.0, 0.0);
+ glTranslated ( -0.1 * scale_factor, 0.0, 0.0 ) ;
break ;
case GLUT_KEY_RIGHT :
- glMatrixMode(GL_MODELVIEW);
+ glMatrixMode ( GL_MODELVIEW ) ;
xwin += 0.1 * scale_factor ;
- glTranslatef(0.1 * scale_factor, 0.0, 0.0);
+ glTranslated ( 0.1 * scale_factor, 0.0, 0.0 ) ;
break ;
case GLUT_KEY_PAGE_UP :
- glMatrixMode(GL_MODELVIEW);
- glTranslatef ( -xwin, -ywin, 0.0 ) ;
- glScalef(1.25, 1.25, 1.25);
- glTranslatef ( xwin, ywin, 0.0 ) ;
+ glMatrixMode ( GL_MODELVIEW ) ;
+ glTranslated ( -xwin, -ywin, 0.0 ) ;
+ glScaled ( 1.25, 1.25, 1.25 ) ;
+ glTranslated ( xwin, ywin, 0.0 ) ;
scale_factor *= 0.8 ;
break ;
case GLUT_KEY_PAGE_DOWN :
- glMatrixMode(GL_MODELVIEW);
- glTranslatef ( -xwin, -ywin, 0.0 ) ;
- glScalef(0.8, 0.8, 0.8);
- glTranslatef ( xwin, ywin, 0.0 ) ;
+ glMatrixMode ( GL_MODELVIEW ) ;
+ glTranslated ( -xwin, -ywin, 0.0 ) ;
+ glScaled ( 0.8, 0.8, 0.8 ) ;
+ glTranslated ( xwin, ywin, 0.0 ) ;
scale_factor *= 1.25 ;
break ;
- }
- glutPostRedisplay();
+ default:
+ need_redisplay = 0;
+ break;
+ }
+ if (need_redisplay)
+ glutPostRedisplay();
}
+
void readConfigFile ( char *fnme )
{
FILE *fptr = fopen ( fnme, "rt" ) ;
int i ;
char inputline [ 256 ] ;
- /* Read a header line */
- fgets ( inputline, 256, fptr ) ;
+ if ( fptr )
+ {
+ /* Read a header line */
+ fgets ( inputline, 256, fptr ) ;
- /* Read a comment line */
- fgets ( inputline, 256, fptr ) ;
+ /* Read a comment line */
+ fgets ( inputline, 256, fptr ) ;
- /* Read the window title */
- fgets ( inputline, 256, fptr ) ;
- sscanf ( inputline, "%s", window_title ) ;
+ /* 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 */
+ fgets ( inputline, 256, fptr ) ;
- /* Read a comment line */
- fgets ( inputline, 256, fptr ) ;
+ /* Read the number of affine transformations */
+ fgets ( inputline, 256, fptr ) ;
+ sscanf ( inputline, "%d", &num_trans ) ;
- /* Read the number of affine transformations */
- fgets ( inputline, 256, fptr ) ;
- sscanf ( inputline, "%d", &num_trans ) ;
+ affine = (AffineTrans *)malloc ( num_trans * sizeof(AffineTrans) ) ;
- affine = (AffineTrans *)malloc ( num_trans * sizeof(AffineTrans) ) ;
+ /* Read a comment line */
+ fgets ( inputline, 256, fptr ) ;
- /* Read a comment line */
- fgets ( inputline, 256, fptr ) ;
+ for ( i = 0; i < num_trans; i++ )
+ {
+ /* Read an affine transformation definition */
+ fgets ( inputline, 256, fptr ) ;
+ sscanf ( inputline, "%lf %lf %lf %lf %lf %lf", &affine[i].a00, &affine[i].a01,
+ &affine[i].a10, &affine[i].a11, &affine[i].b0, &affine[i].b1 ) ;
+ }
+ }
+ else /* No data file, set a default */
+ {
+ printf ( "ERROR opening file <%s>\n", fnme ) ;
+ strcpy ( window_title, "Cantor Dust" ) ;
+ num_trans = 2 ;
+ affine = (AffineTrans *)malloc ( num_trans * sizeof(AffineTrans) ) ;
+ affine[0].a00 = 0.25 ; affine[0].a01 = 0.00 ; affine[0].a10 = 0.00 ; affine[0].a11 = 0.25 ;
+ affine[0].b0 = 0.0 ; affine[0].b1 = 0.0 ;
+ affine[1].a00 = 0.25 ; affine[1].a01 = 0.00 ; affine[1].a10 = 0.00 ; affine[1].a11 = 0.25 ;
+ affine[1].b0 = 0.5 ; affine[1].b1 = 0.0 ;
+ }
for ( i = 0; i < num_trans; i++ )
{
double m00, m01, m10, m11 ; /* Matrix "I" minus "A" */
double determ ; /* Determinant of this matrix */
- /* Read an affine transformation definition */
- fgets ( inputline, 256, fptr ) ;
- sscanf ( inputline, "%lf %lf %lf %lf %lf %lf", &affine[i].a00, &affine[i].a01,
- &affine[i].a10, &affine[i].a11, &affine[i].b0, &affine[i].b1 ) ;
-
/* Calculate the stationary point */
m00 = 1.0 - affine[i].a00 ;
{
int fractal_window ;
+ glutInitWindowSize(500, 250);
+ glutInitWindowPosition ( 140, 140 );
+ glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE );
+ glutInit(&argc, argv);
+
if ( argc > 1 )
readConfigFile ( argv[1] ) ;
else
readConfigFile ( "fractals.dat" ) ;
- glutInit(&argc, argv);
- glutInitWindowSize(500, 250);
- glutInitWindowPosition ( 140, 140 ) ;
-
- glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE | GLUT_DEPTH);
-
fractal_window = glutCreateWindow( window_title );
glClearColor(1.0, 1.0, 1.0, 1.0);
projects / freeglut / blobdiff