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=fd8c9fbf51f7f5d4a0ea9cd3edbe3e5b9a28a264;hpb=b002d4d62a9591e15a8fc58d4043f103ce5d51de;p=freeglut diff --git a/progs/demos/Fractals_random/fractals_random.c b/progs/demos/Fractals_random/fractals_random.c index fd8c9fb..aa10641 100644 --- a/progs/demos/Fractals_random/fractals_random.c +++ b/progs/demos/Fractals_random/fractals_random.c @@ -23,7 +23,13 @@ #include #include #include +#include #include +#define FGH_PI 3.14159265358979323846 +#ifdef _MSC_VER +/* DUMP MEMORY LEAKS */ +#include +#endif typedef struct { @@ -44,11 +50,11 @@ static AffineTrans *affine ; char window_title [ 80 ] ; /* The amount the view is translated */ -float xwin = 0.0, ywin = 0.0 ; -float scale_factor = 1.0 ; +double xwin = 0.0, ywin = 0.0 ; +double scale_factor = 1.0 ; /* The current point */ -float current_x = 0.0, current_y = 0.0 ; +double current_x = 0.0, current_y = 0.0 ; /* Signals when a glClear is needed */ static GLboolean needClear = GL_TRUE; @@ -60,11 +66,11 @@ static void draw_level ( int num, double m00, double m01, double m10, double m11 for ( i = 0; i < 10; i++ ) { - int random = (rand() >> 10) % num_trans; - float new_x = affine[random].a00 * current_x + affine[random].a01 * current_y + affine[random].b0 ; - float new_y = affine[random].a10 * current_x + affine[random].a11 * current_y + affine[random].b1 ; - - glVertex2f ( new_x, new_y ) ; + 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 ; current_y = new_y ; } @@ -80,7 +86,7 @@ Display(void) /* the curve */ glPushMatrix(); - glScalef(2.5, 2.5, 2.5); + glScaled(2.5, 2.5, 2.5); glColor4f(0.0, 0.0, 0.0, 1.0); glBegin ( GL_POINTS ) ; @@ -109,13 +115,15 @@ Reshape(int width, int height) glLoadIdentity(); xwin = -1.0 ; ywin = 0.0 ; - glTranslatef(xwin, ywin, -5.0); + glTranslated(xwin, ywin, -5.0); needClear = GL_TRUE; } static void Key(unsigned char key, int x, int y) { + int changed_settings = 1; + switch (key) { case 27: /* Escape key */ glutLeaveMainLoop (); @@ -126,67 +134,138 @@ Key(unsigned char key, int x, int y) glLoadIdentity(); xwin = -1.0 ; ywin = 0.0 ; - glTranslatef(xwin, ywin, -5.0); - + glTranslated(xwin, ywin, -5.0); break ; - } - - needClear = GL_TRUE; + default: + changed_settings = 0; + break; + } + if (changed_settings) + needClear = GL_TRUE; glutPostRedisplay(); } static void Special(int key, int x, int y) { + int changed_settings = 1; + switch (key) { case GLUT_KEY_UP : 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); 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); 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); 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 ) ; + 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 ) ; + glTranslated ( -xwin, -ywin, 0.0 ) ; + glScaled(0.8, 0.8, 0.8); + glTranslated ( xwin, ywin, 0.0 ) ; scale_factor *= 1.25 ; break ; + + default: + changed_settings = 0; + break; } + if (changed_settings) + needClear = GL_TRUE; + + glutPostRedisplay(); +} + + +static int mouse_x = 0, mouse_y = 0 ; +static int button_down = GLUT_DOWN ; + +static void +Mouse ( int button, int updown, int x, int y ) +{ + button_down = updown ; + + if ( updown == GLUT_DOWN ) + { + mouse_x = x ; + mouse_y = y ; + } +} + +static void +MouseMotion ( int x, int y ) +{ + int window_width = glutGet ( GLUT_WINDOW_WIDTH ) ; + int window_height = glutGet ( GLUT_WINDOW_HEIGHT ) ; + int window_size = ( window_width < window_height ) ? window_width : window_height ; + + double delta_x = 5.0 * (double)(x - mouse_x) / (double)(window_size) ; + double delta_y = 5.0 * (double)(y - mouse_y) / (double)(window_size) ; + + xwin += delta_x * scale_factor ; + ywin -= delta_y * scale_factor ; + glMatrixMode ( GL_MODELVIEW ) ; + glTranslated ( delta_x * scale_factor, -delta_y * scale_factor, 0.0 ) ; needClear = GL_TRUE; + glutPostRedisplay(); + + mouse_x = x ; + mouse_y = y ; +} + +static void +MouseWheel ( int wheel_number, int direction, int x, int y ) +{ + double scale = ( direction > 0 ) ? 1.25 : 0.8 ; + + glMatrixMode ( GL_MODELVIEW ) ; + glTranslated ( -xwin, -ywin, 0.0 ) ; + glScaled ( scale, scale, scale ) ; + glTranslated ( xwin, ywin, 0.0 ) ; + scale_factor /= scale ; + needClear = GL_TRUE; 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" ) ; @@ -196,13 +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 @@ -211,21 +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 ) ; } @@ -233,13 +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++ ) @@ -269,8 +355,6 @@ void readConfigFile ( char *fnme ) int main(int argc, char *argv[]) { - int fractal_window ; - glutInitDisplayMode( GLUT_RGB | GLUT_SINGLE ); glutInitWindowSize(500, 250); @@ -282,7 +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); @@ -290,10 +374,20 @@ main(int argc, char *argv[]) glutKeyboardFunc(Key); glutSpecialFunc(Special); glutDisplayFunc(Display); + glutMouseFunc(Mouse); + glutMotionFunc(MouseMotion); + glutMouseWheelFunc(MouseWheel); glutMainLoop(); printf ( "Back from the 'freeglut' main loop\n" ) ; + free ( affine ) ; + +#ifdef _MSC_VER + /* DUMP MEMORY LEAK INFORMATION */ + _CrtDumpMemoryLeaks () ; +#endif + return 0; /* ANSI C requires main to return int. */ }