X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=progs%2Fdemos%2FFractals%2Ffractals.c;h=2c7fcce266362fcd418e6e311ee4380a70915879;hb=7ff5f34c5ec3b44e3bc6a022122fc101ed8f584f;hp=644b33724a63690d332d09458944e89489e00d62;hpb=1fdf3d47e17bb436f139c8a69ee28d36a881820d;p=freeglut diff --git a/progs/demos/Fractals/fractals.c b/progs/demos/Fractals/fractals.c index 644b337..2c7fcce 100644 --- a/progs/demos/Fractals/fractals.c +++ b/progs/demos/Fractals/fractals.c @@ -21,7 +21,9 @@ #include #include #include +#include #include +#define FGH_PI 3.14159265358979323846 typedef struct { @@ -32,12 +34,15 @@ typedef struct AffineTrans ; /* Number of levels to draw the fractal */ -static int num_levels = 0 ; +static int num_levels = 4 ; /* The definition of the fractal */ static int num_trans ; static AffineTrans *affine ; +/* Flag telling us to keep executing the main loop */ +static int continue_in_main_loop = 1; + /* the window title */ char window_title [ 80 ] ; @@ -83,7 +88,7 @@ static void draw_level ( int num, double m00, double m01, double m10, double m11 static void Display(void) { - glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + glClear( GL_COLOR_BUFFER_BIT ); /* the curve */ glPushMatrix(); @@ -106,7 +111,10 @@ Reshape(int width, int height) 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 ; @@ -117,9 +125,11 @@ Reshape(int width, int height) static void Key(unsigned char key, int x, int y) { + int need_redisplay = 1; + switch (key) { case 27: /* Escape key */ - glutLeaveMainLoop () ; + continue_in_main_loop = 0 ; break; case '+' : @@ -137,16 +147,21 @@ Key(unsigned char key, int x, int y) xwin = -1.0 ; ywin = 0.0 ; 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 ) ; @@ -187,49 +202,93 @@ Special(int key, int x, int y) glTranslated ( xwin, ywin, 0.0 ) ; scale_factor *= 1.25 ; break ; + + default: + need_redisplay = 0; + break; } + if (need_redisplay) + glutPostRedisplay(); +} + - glutPostRedisplay(); +static void +checkedFGets ( char *s, int size, FILE *stream ) +{ + if ( fgets ( s, size, stream ) == NULL ) { + fprintf ( stderr, "fgets failed\n"); + exit ( EXIT_FAILURE ); + } } + 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 */ + checkedFGets ( inputline, sizeof ( inputline ), fptr ) ; - /* Read a comment line */ - fgets ( inputline, 256, fptr ) ; + /* Read a comment line */ + checkedFGets ( inputline, sizeof ( inputline ), fptr ) ; - /* Read the window title */ - fgets ( inputline, 256, fptr ) ; - sscanf ( inputline, "%[a-zA-Z0-9!@#$%^&*()+=/\\_-\" ]", window_title ) ; + /* Read the window title */ + checkedFGets ( inputline, sizeof ( inputline ), fptr ) ; + /* We assume here that this line will not exceed 79 characters plus a + newline (window_title is 80 characters long). That'll cause a buffer + overflow. For a simple program like this, though, we're letting it + slide! + */ + sscanf ( inputline, "%[a-zA-Z0-9!@#$%^&*()+=/\\_-\" ]", window_title ) ; - /* Read a comment line */ - fgets ( inputline, 256, fptr ) ; + /* Read a comment line */ + checkedFGets ( inputline, sizeof ( inputline ), fptr ) ; - /* Read the number of affine transformations */ - fgets ( inputline, 256, fptr ) ; - sscanf ( inputline, "%d", &num_trans ) ; + /* Read the number of affine transformations */ + checkedFGets ( inputline, sizeof ( inputline ), 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 */ + checkedFGets ( inputline, sizeof ( inputline ), fptr ) ; + + for ( i = 0; i < num_trans; i++ ) + { + /* Read an affine transformation definition */ + checkedFGets ( inputline, sizeof ( inputline ), 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, "Koch Snowflake" ) ; + num_trans = 4 ; + affine = (AffineTrans *)malloc ( num_trans * sizeof(AffineTrans) ) ; + affine[0].a00 = 1/3. ; affine[0].a01 = 0.00 ; affine[0].a10 = 0.00 ; affine[0].a11 = 1/3. ; + affine[0].b0 = 0.0 ; affine[0].b1 = 0.0 ; + + affine[1].a00 = 1/6. ; affine[1].a01 = -1/3.*sin(FGH_PI/3.) ; affine[1].a10 = 1/3.*sin(FGH_PI/3.) ; affine[1].a11 = 1/6. ; + affine[1].b0 = 1/3. ; affine[1].b1 = 0.0 ; + + affine[2].a00 = 1/6. ; affine[2].a01 = -1/3.*sin(-FGH_PI/3.) ; affine[2].a10 = 1/3.*sin(-FGH_PI/3.) ; affine[2].a11 = 1/6. ; + affine[2].b0 = 0.5 ; affine[2].b1 = sqrt(3)/6. ; + + affine[3].a00 = 1/3. ; affine[3].a01 = 0.00 ; affine[3].a10 = 0.00 ; affine[3].a11 = 1/3. ; + affine[3].b0 = 2/3. ; affine[3].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 ; @@ -252,20 +311,17 @@ void readConfigFile ( char *fnme ) int main(int argc, char *argv[]) { - 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 ); + glutCreateWindow( window_title ); glClearColor(1.0, 1.0, 1.0, 1.0); @@ -274,7 +330,11 @@ main(int argc, char *argv[]) glutSpecialFunc(Special); glutDisplayFunc(Display); - glutMainLoop(); +#ifdef WIN32 +#endif + + while ( continue_in_main_loop ) + glutMainLoopEvent(); printf ( "Back from the 'freeglut' main loop\n" ) ;