Added ESC key handling

1 files changed, 26 insertions, 12 deletions

diff --git a/progs/redbook/nurbs.c b/progs/redbook/nurbs.c
index 513868e7d1..a7c6f0c696 100644
--- a/progs/redbook/nurbs.c
+++ b/progs/redbook/nurbs.c
@@ -3,14 +3,14 @@
 
 /*
  * (c) Copyright 1993, Silicon Graphics, Inc.
- * ALL RIGHTS RESERVED 
- * Permission to use, copy, modify, and distribute this software for 
+ * ALL RIGHTS RESERVED
+ * Permission to use, copy, modify, and distribute this software for
  * any purpose and without fee is hereby granted, provided that the above
  * copyright notice appear in all copies and that both the copyright notice
- * and this permission notice appear in supporting documentation, and that 
+ * and this permission notice appear in supporting documentation, and that
  * the name of Silicon Graphics, Inc. not be used in advertising
  * or publicity pertaining to distribution of the software without specific,
- * written prior permission. 
+ * written prior permission.
  *
  * THE MATERIAL EMBODIED ON THIS SOFTWARE IS PROVIDED TO YOU "AS-IS"
  * AND WITHOUT WARRANTY OF ANY KIND, EXPRESS, IMPLIED OR OTHERWISE,
@@ -24,8 +24,8 @@
  * ADVISED OF THE POSSIBILITY OF SUCH LOSS, HOWEVER CAUSED AND ON
  * ANY THEORY OF LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE
  * POSSESSION, USE OR PERFORMANCE OF THIS SOFTWARE.
- * 
- * US Government Users Restricted Rights 
+ *
+ * US Government Users Restricted Rights
  * Use, duplication, or disclosure by the Government is subject to
  * restrictions set forth in FAR 52.227.19(c)(2) or subparagraph
  * (c)(1)(ii) of the Rights in Technical Data and Computer Software
@@ -46,10 +46,10 @@
 #include <GL/glut.h>
 
 #define S_NUMPOINTS 13
-#define S_ORDER     3   
+#define S_ORDER     3
 #define S_NUMKNOTS  (S_NUMPOINTS + S_ORDER)
 #define T_NUMPOINTS 3
-#define T_ORDER     3 
+#define T_ORDER     3
 #define T_NUMKNOTS  (T_NUMPOINTS + T_ORDER)
 #define SQRT2    1.41421356237309504880
 
@@ -86,7 +86,7 @@ GLfloat ctlpoints[S_NUMPOINTS][T_NUMPOINTS][4] = {
 
 GLUnurbsObj *theNurb;
 
-/*  Initialize material property, light source, lighting model, 
+/*  Initialize material property, light source, lighting model,
  *  and depth buffer.
  */
 void myinit(void)
@@ -133,12 +133,12 @@ void display(void)
     glTranslatef (-4., -4.5, -2.5);
 
     gluBeginSurface(theNurb);
-    gluNurbsSurface(theNurb, 
+    gluNurbsSurface(theNurb,
 	    S_NUMKNOTS, sknots,
 	    T_NUMKNOTS, tknots,
 	    4 * T_NUMPOINTS,
 	    4,
-	    &ctlpoints[0][0][0], 
+	    &ctlpoints[0][0][0],
 	    S_ORDER, T_ORDER,
 	    GL_MAP2_VERTEX_4);
     gluEndSurface(theNurb);
@@ -159,8 +159,21 @@ void myReshape(int w, int h)
     gluLookAt(7.0,4.5,4.0, 4.5,4.5,2.0, 6.0,-3.0,2.0);
 }
 
+static void
+key(unsigned char k, int x, int y)
+{
+  switch (k) {
+  case 27:  /* Escape */
+    exit(0);
+    break;
+  default:
+    return;
+  }
+  glutPostRedisplay();
+}
+
 /*  Main Loop
- *  Open window with initial window size, title bar, 
+ *  Open window with initial window size, title bar,
  *  RGBA display mode, and handle input events.
  */
 int main(int argc, char** argv)
@@ -171,6 +184,7 @@ int main(int argc, char** argv)
     myinit();
     glutReshapeFunc (myReshape);
     glutDisplayFunc(display);
+    glutKeyboardFunc(key);
     glutMainLoop();
     return 0;             /* ANSI C requires main to return int. */
 }