X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?a=blobdiff_plain;f=progs%2Fdemos%2FFractals_random%2Ffractals_random.c;h=176013f47ae3ab9960b46b2db24a4f442eef226d;hb=2de8ecb067e6142a4f0d717c1e5bef62f3f53b81;hp=038d75721cada118cb3b262e3ff277e591385cda;hpb=637007796c646a946fefba4c5e7f9d74c52e5cad;p=freeglut

diff --git a/progs/demos/Fractals_random/fractals_random.c b/progs/demos/Fractals_random/fractals_random.c
index 038d757..176013f 100644
--- a/progs/demos/Fractals_random/fractals_random.c
+++ b/progs/demos/Fractals_random/fractals_random.c
@@ -23,9 +23,11 @@
 #include <GL/freeglut.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <math.h>
-#ifdef WIN32
-#include <crtdbg.h>  // DUMP MEMORY LEAKS
+#ifdef _MSC_VER
+/* DUMP MEMORY LEAKS */
+#include <crtdbg.h>
 #endif
 
 typedef struct
@@ -63,11 +65,11 @@ 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;
+    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 ;
-
-    glVertex2f ( new_x, new_y ) ;
+    
+    glVertex2d ( new_x, new_y ) ;
     current_x = new_x ;
     current_y = new_y ;
   }
@@ -200,6 +202,69 @@ Special(int key, int x, int y)
 }
 
 
+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" ) ;
@@ -209,13 +274,13 @@ 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 
@@ -224,21 +289,21 @@ 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 ) ;
     }
@@ -303,6 +368,9 @@ main(int argc, char *argv[])
   glutKeyboardFunc(Key);
   glutSpecialFunc(Special);
   glutDisplayFunc(Display);
+  glutMouseFunc(Mouse);
+  glutMotionFunc(MouseMotion);
+  glutMouseWheelFunc(MouseWheel);
 
   glutMainLoop();
 
@@ -310,8 +378,9 @@ 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. */