X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=progs%2Fdemos%2FFractals_random%2Ffractals_random.c;h=3799ba0014954cf0653f0911cb75a132732f82a9;hb=1d883926ef0bf15e6af94957f01ea8e7ef6088a5;hp=a935adcd77f74410c51e328054ee720920c304b8;hpb=2c01bd6cfd78f2cbb562144b39358b55d5e5c07d;p=freeglut diff --git a/progs/demos/Fractals_random/fractals_random.c b/progs/demos/Fractals_random/fractals_random.c index a935adc..3799ba0 100644 --- a/progs/demos/Fractals_random/fractals_random.c +++ b/progs/demos/Fractals_random/fractals_random.c @@ -23,7 +23,11 @@ #include #include #include +#include #include +#ifdef WIN32 +#include // DUMP MEMORY LEAKS +#endif typedef struct { @@ -44,11 +48,14 @@ 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; static void draw_level ( int num, double m00, double m01, double m10, double m11, double n0, double n1 ) { @@ -57,11 +64,11 @@ static void draw_level ( int num, double m00, double m01, double m10, double m11 for ( i = 0; i < 10; i++ ) { - int random = rand () * num_trans / RAND_MAX ; - 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 ; } @@ -70,9 +77,14 @@ static void draw_level ( int num, double m00, double m01, double m10, double m11 static void Display(void) { + if (needClear) { + glClear(GL_COLOR_BUFFER_BIT); + needClear = GL_FALSE; + } + /* 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 ) ; @@ -80,6 +92,8 @@ Display(void) glEnd () ; glPopMatrix(); + + glFlush(); glutPostRedisplay(); /* Needed so that this function will be called again */ } @@ -91,17 +105,23 @@ 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 ; 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 (); @@ -112,104 +132,188 @@ 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 ; - } - - glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + 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(); - glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); + 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(); } + 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 ; @@ -234,31 +338,38 @@ main(int argc, char *argv[]) { 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); glutDisplayFunc(Display); + glutMouseFunc(Mouse); + glutMotionFunc(MouseMotion); + glutMouseWheelFunc(MouseWheel); glutMainLoop(); printf ( "Back from the 'freeglut' main loop\n" ) ; + free ( affine ) ; + +#ifdef WIN32 + _CrtDumpMemoryLeaks () ; // DUMP MEMORY LEAK INFORMATION +#endif + return 0; /* ANSI C requires main to return int. */ }