Added ESC key handling

1 files changed, 26 insertions, 12 deletions

diff --git a/progs/redbook/plane.c b/progs/redbook/plane.c
index 2b0cca06fa..dc17f7b238 100644
--- a/progs/redbook/plane.c
+++ b/progs/redbook/plane.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
@@ -39,7 +39,7 @@
  */
 /*
  *  plane.c
- *  This program demonstrates the use of local versus 
+ *  This program demonstrates the use of local versus
  *  infinite lighting on a flat plane.
  */
 #include <stdlib.h>
@@ -130,17 +130,30 @@ void myReshape(int w, int h)
     glViewport (0, 0, w, h);
     glMatrixMode (GL_PROJECTION);
     glLoadIdentity ();
-    if (w <= h) 
-	glOrtho (-1.5, 1.5, -1.5*(GLdouble)h/(GLdouble)w, 
+    if (w <= h)
+	glOrtho (-1.5, 1.5, -1.5*(GLdouble)h/(GLdouble)w,
 	    1.5*(GLdouble)h/(GLdouble)w, -10.0, 10.0);
-    else 
-	glOrtho (-1.5*(GLdouble)w/(GLdouble)h, 
+    else
+	glOrtho (-1.5*(GLdouble)w/(GLdouble)h,
 	    1.5*(GLdouble)w/(GLdouble)h, -1.5, 1.5, -10.0, 10.0);
     glMatrixMode (GL_MODELVIEW);
 }
 
+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)
@@ -152,6 +165,7 @@ int main(int argc, char** argv)
     myinit();
     glutReshapeFunc (myReshape);
     glutDisplayFunc(display);
+    glutKeyboardFunc(key);
     glutMainLoop();
     return 0;             /* ANSI C requires main to return int. */
 }