Improved ignorance.

[freeglut] / progs / demos / Fractals / fractals.c

diff --git a/progs/demos/Fractals/fractals.c b/progs/demos/Fractals/fractals.c
index e015eb2..9bb3bfe 100644 (file)
--- a/progs/demos/Fractals/fractals.c
+++ b/progs/demos/Fractals/fractals.c
@@ -21,6 +21,7 @@
 #include <GL/freeglut.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <string.h>
 #include <math.h>
 
 typedef struct
@@ -120,6 +121,8 @@ Reshape(int width, int height)
 static void 
 Key(unsigned char key, int x, int y)
 {
+  int need_redisplay = 1;
+  
   switch (key) {
   case 27:  /* Escape key */
     glutLeaveMainLoop () ;
@@ -140,16 +143,21 @@ Key(unsigned char key, int x, int y)
     xwin = -1.0 ;
     ywin = 0.0 ;
     glTranslated ( xwin, ywin, -5.0 ) ;
-
     break ;
-  }
 
-  glutPostRedisplay();
+  default:
+    need_redisplay = 0;
+    break;
+  }
+  if (need_redisplay)
+    glutPostRedisplay();
 }
 
 static void 
 Special(int key, int x, int y)
 {
+  int need_redisplay = 1;
+
   switch (key) {
   case GLUT_KEY_UP :
     glMatrixMode ( GL_MODELVIEW ) ;
@@ -190,9 +198,13 @@ Special(int key, int x, int y)
     glTranslated ( xwin, ywin, 0.0 ) ;
     scale_factor *= 1.25 ;
     break ;
-  }
 
-  glutPostRedisplay();
+  default:
+    need_redisplay = 0;
+    break;
+  }
+  if (need_redisplay)
+    glutPostRedisplay();
 }