X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=progs%2Fdemos%2FFractals_random%2Ffractals_random.c;h=aa106414efefc5dc8e0a0df0af125fee684c49ca;hb=8f7014249e5f2b352569c7b22aa190125aeef9ab;hp=9c4575f94c070952f83dfb5505aa0c5d6073e905;hpb=0c915a83c6995a6fd68d509f35de2403f44a70a0;p=freeglut diff --git a/progs/demos/Fractals_random/fractals_random.c b/progs/demos/Fractals_random/fractals_random.c index 9c4575f..aa10641 100644 --- a/progs/demos/Fractals_random/fractals_random.c +++ b/progs/demos/Fractals_random/fractals_random.c @@ -23,9 +23,12 @@ #include #include #include +#include #include -#ifdef WIN32 -#include // DUMP MEMORY LEAKS +#define FGH_PI 3.14159265358979323846 +#ifdef _MSC_VER +/* DUMP MEMORY LEAKS */ +#include #endif typedef struct @@ -63,12 +66,9 @@ static void draw_level ( int num, double m00, double m01, double m10, double m11 for ( i = 0; i < 10; i++ ) { - int random = rand( ); - double new_x; - double new_y; - random = (((random >> 10)) & 2) + (((random >> 20) ) & 1); - new_x = affine[random].a00 * current_x + affine[random].a01 * current_y + affine[random].b0 ; - new_y = affine[random].a10 * current_x + affine[random].a11 * current_y + affine[random].b1 ; + int random = ( rand( ) >> 10 ) % num_trans; + double new_x = affine[random].a00 * current_x + affine[random].a01 * current_y + affine[random].b0 ; + double new_y = affine[random].a10 * current_x + affine[random].a11 * current_y + affine[random].b1 ; glVertex2d ( new_x, new_y ) ; current_x = new_x ; @@ -256,6 +256,16 @@ MouseWheel ( int wheel_number, int direction, int x, int y ) } +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" ) ; @@ -265,13 +275,13 @@ void readConfigFile ( char *fnme ) if ( fptr ) { /* Read a header line */ - fgets ( inputline, 256, fptr ) ; + checkedFGets ( inputline, sizeof ( inputline ), fptr ) ; /* Read a comment line */ - fgets ( inputline, 256, fptr ) ; + checkedFGets ( inputline, sizeof ( inputline ), fptr ) ; /* Read the window title */ - fgets ( inputline, 256, fptr ) ; + 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 @@ -280,21 +290,21 @@ void readConfigFile ( char *fnme ) sscanf ( inputline, "%[a-zA-Z0-9!@#$%^&*()+=/\\_-\" ]", window_title ) ; /* Read a comment line */ - fgets ( inputline, 256, fptr ) ; + checkedFGets ( inputline, sizeof ( inputline ), fptr ) ; /* Read the number of affine transformations */ - fgets ( inputline, 256, fptr ) ; + checkedFGets ( inputline, sizeof ( inputline ), fptr ) ; sscanf ( inputline, "%d", &num_trans ) ; affine = (AffineTrans *)malloc ( num_trans * sizeof(AffineTrans) ) ; /* Read a comment line */ - fgets ( inputline, 256, fptr ) ; + checkedFGets ( inputline, sizeof ( inputline ), fptr ) ; for ( i = 0; i < num_trans; i++ ) { /* Read an affine transformation definition */ - fgets ( inputline, 256, fptr ) ; + 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 ) ; } @@ -302,13 +312,20 @@ void readConfigFile ( char *fnme ) else /* No data file, set a default */ { printf ( "ERROR opening file <%s>\n", fnme ) ; - strcpy ( window_title, "Cantor Dust" ) ; - num_trans = 2 ; + strcpy ( window_title, "Koch Snowflake" ) ; + num_trans = 4 ; 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].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 = 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 ; + + 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++ ) @@ -338,8 +355,6 @@ void readConfigFile ( char *fnme ) int main(int argc, char *argv[]) { - int fractal_window ; - glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE ); glutInitWindowSize(500, 250); @@ -351,7 +366,7 @@ main(int argc, char *argv[]) else readConfigFile ( "fractals.dat" ) ; - fractal_window = glutCreateWindow( window_title ); + glutCreateWindow( window_title ); glClearColor(1.0, 1.0, 1.0, 1.0); @@ -369,8 +384,9 @@ main(int argc, char *argv[]) free ( affine ) ; -#ifdef WIN32 - _CrtDumpMemoryLeaks () ; // DUMP MEMORY LEAK INFORMATION +#ifdef _MSC_VER + /* DUMP MEMORY LEAK INFORMATION */ + _CrtDumpMemoryLeaks () ; #endif return 0; /* ANSI C requires main to return int. */