http://www.tienza.es/crux/src/www.jwz.org/xscreensaver/xscreensaver-5.05.tar.gz

[xscreensaver] / hacks / glx / gltrackball.c

diff --git a/hacks/glx/gltrackball.c b/hacks/glx/gltrackball.c
index c7ddc8b3364d89a0c462f62a52470cd41d21f08d..e3c0cd42402fdb781b03a48a0be8e502d4c7f9c9 100644 (file)
--- a/hacks/glx/gltrackball.c
+++ b/hacks/glx/gltrackball.c
@@ -1,4 +1,4 @@
-/* gltrackball, Copyright (c) 2002 Jamie Zawinski <jwz@jwz.org>
+/* gltrackball, Copyright (c) 2002-2008 Jamie Zawinski <jwz@jwz.org>
  * GL-flavored wrapper for trackball.c
  *
  * Permission to use, copy, modify, distribute, and sell this software and its
@@ -10,10 +10,19 @@
  * implied warranty.
  */
 
-#include "config.h"
-#include <stdlib.h>
 #include <math.h>
-#include <GL/gl.h>
+#include <stdlib.h>
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#ifdef HAVE_COCOA
+# include <OpenGL/gl.h>
+#else
+# include <GL/gl.h>
+#endif
+
 #include "trackball.h"
 #include "gltrackball.h"
 
@@ -73,3 +82,61 @@ gltrackball_rotate (trackball_state *ts)
   build_rotmatrix (m, ts->q);
   glMultMatrixf (&m[0][0]);
 }
+
+
+# define Button4 4  /* X11/Xlib.h */
+# define Button5 5
+# define Button6 6
+# define Button7 7
+
+/* Call this when a mouse-wheel click is detected.
+   Clicks act like horizontal or vertical drags.
+   Percent is the length of the drag as a percentage of the screen size.
+   Button is 'Button4' or 'Button5' (for the vertical wheel)
+   or 'Button5' or 'Button6' (for the horizontal wheel).
+   If `flip_p' is true, swap the horizontal and vertical axes.
+ */
+void
+gltrackball_mousewheel (trackball_state *ts,
+                        int button, int percent, int flip_p)
+{
+  int up_p;
+  double move;
+  int horizontal_p;
+
+#ifdef HAVE_COCOA
+  flip_p = 0;      /* MacOS has already handled this. */
+#endif
+
+  switch (button) {
+  case Button4: up_p = 1; horizontal_p = 0; break;
+  case Button5: up_p = 0; horizontal_p = 0; break;
+  case Button6: up_p = 1; horizontal_p = 1; break;
+  case Button7: up_p = 0; horizontal_p = 1; break;
+  default: abort(); break;
+  }
+
+  if (flip_p)
+    {
+      horizontal_p = !horizontal_p;
+      up_p = !up_p;
+    }
+
+  move = (up_p
+          ? 1.0 - (percent / 100.0)
+          : 1.0 + (percent / 100.0));
+
+  gltrackball_start (ts, 50, 50, 100, 100);
+  if (horizontal_p)
+    gltrackball_track (ts, 50*move, 50, 100, 100);
+  else
+    gltrackball_track (ts, 50, 50*move, 100, 100);
+}
+
+void
+gltrackball_get_quaternion (trackball_state *ts, float q[4])
+{
+  int i;
+  for (i=0; i<4; i++)
+    q[i] = ts->q[i];
+}