#include <GL/freeglut.h>
#include <stdio.h>
#include <stdlib.h>
+#include <string.h>
#include <math.h>
+#ifdef WIN32
+#include <crtdbg.h> // DUMP MEMORY LEAKS
+#endif
typedef struct
{
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;
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 ;
}
/* 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 ) ;
glLoadIdentity();
xwin = -1.0 ;
ywin = 0.0 ;
- glTranslatef(xwin, ywin, -5.0);
+ glTranslated(xwin, ywin, -5.0);
needClear = GL_TRUE;
}
glLoadIdentity();
xwin = -1.0 ;
ywin = 0.0 ;
- glTranslatef(xwin, ywin, -5.0);
+ glTranslated(xwin, ywin, -5.0);
break ;
default:
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 ;
}
+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();
+}
+
+
void readConfigFile ( char *fnme )
{
FILE *fptr = fopen ( fnme, "rt" ) ;
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. */
}