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+/*
+ * fracviewer.h [from agviewer.h  (version 1.0)]
+ *
+ * AGV: a glut viewer. Routines for viewing a 3d scene w/ glut
+ *
+ * The two view movement modes are POLAR and FLYING.  Both move the eye, NOT
+ * THE OBJECT.  You can never be upside down or twisted (roll) in either mode.
+ *
+ * A nice addition would be an examiner type trackball mode where you are
+ * moving the object and so could see it from any angle.  Also less restricted
+ * flying and polar modes (fly upside down, do rolls, etc.).
+ *
+ * Controls for Polar are just left and middle buttons -- for flying it's
+ * those plus 0-9 number keys and +/- for speed adjustment.
+ *
+ * See agv_example.c and agviewer.c for more info.  Probably want to make
+ * a copy of these and then edit for each program.  This isn't meant to be
+ * a library, just something to graft onto your own programs.
+ *
+ * I welcome any feedback or improved versions.
+ *
+ * Philip Winston - 4/11/95
+ * pwinston@hmc.edu
+ * http://www.cs.hmc.edu/people/pwinston
+ */
+
+
+ /*
+  * Call agvInit() with glut's current window set to the window in 
+  * which you want to run the viewer. Right after creating it is fine.  It
+  * will remember that window for possible later use (see below) and
+  * registers mouse, motion, and keyboard handlers for that window (see below).
+  *
+  * allowidle is 1 or 0 depnding on whether you will let AGV install
+  * and uninstall an idle function.  0 means you will not let it (because
+  * you will be having your own idle function). In this case it is your
+  * responsibility to put a statement like:
+  *
+  *     if (agvMoving)
+  *       agvMove();
+  *
+  * at the end of your idle function, to let AGV update the viewpoint if it
+  * is moving. 
+  *
+  * If allowidle is 1 it means AGV will install its own idle which
+  * will update the viewpoint as needed and send glutPostRedisplay() to the
+  * window which was current when agvInit() was called.
+  *
+  * agvSetIdleAllow changes this value so you can let AGV install its idle
+  * when your idle isn't installed. 
+  *
+  */
+void agvInit(int allowidle);
+void agvSetAllowIdle(int allowidle);
+
+
+ /*
+  * Set which movement mode you are in.
+  */
+typedef enum { FLYING, POLAR } MovementType;
+void agvSwitchMoveMode(int move);
+
+ /*
+  * agvViewTransform basically does the appropriate gluLookAt() for the 
+  * current position.  So call it in your display on the projection matrix
+  */
+void agvViewTransform(void);
+
+ /*
+  * agvMoving will be set by AGV according to whether it needs you to call
+  * agvMove() at the end of your idle function.  You only need these if 
+  * you aren't allowing AGV to do its own idle.
+  * (Don't change the value of agvMoving)
+  */
+extern int agvMoving;
+void agvMove(void);
+
+ /*
+  * These are the routines AGV registers to deal with mouse and keyboard input.
+  * Keyboard input only matters in flying mode, and then only to set speed.
+  * Mouse input only uses left two buttons in both modes.
+  * These are all registered with agvInit(), but you could register
+  * something else which called these, or reregister these as needed 
+  */
+void agvHandleButton(int button, int state, int x, int y);
+void agvHandleMotion(int x, int y);
+void agvHandleKeys(unsigned char key, int x, int y);
+
+ /*
+  * Just an extra routine which makes an x-y-z axes (about 10x10x10)
+  * which is nice for aligning things and debugging.  Pass it an available
+  * displaylist number.
+  */
+void agvMakeAxesList(int displaylist);
+
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