1 /* $Id: kview.c,v 1.2 2004-12-19 14:52:48 btb Exp $ */
3 THE COMPUTER CODE CONTAINED HEREIN IS THE SOLE PROPERTY OF PARALLAX
4 SOFTWARE CORPORATION ("PARALLAX"). PARALLAX, IN DISTRIBUTING THE CODE TO
5 END-USERS, AND SUBJECT TO ALL OF THE TERMS AND CONDITIONS HEREIN, GRANTS A
6 ROYALTY-FREE, PERPETUAL LICENSE TO SUCH END-USERS FOR USE BY SUCH END-USERS
7 IN USING, DISPLAYING, AND CREATING DERIVATIVE WORKS THEREOF, SO LONG AS
8 SUCH USE, DISPLAY OR CREATION IS FOR NON-COMMERCIAL, ROYALTY OR REVENUE
9 FREE PURPOSES. IN NO EVENT SHALL THE END-USER USE THE COMPUTER CODE
10 CONTAINED HEREIN FOR REVENUE-BEARING PURPOSES. THE END-USER UNDERSTANDS
11 AND AGREES TO THE TERMS HEREIN AND ACCEPTS THE SAME BY USE OF THIS FILE.
12 COPYRIGHT 1993-1998 PARALLAX SOFTWARE CORPORATION. ALL RIGHTS RESERVED.
17 * Functions for changing viewer's position
22 static char rcsid[] = "$Id: kview.c,v 1.2 2004-12-19 14:52:48 btb Exp $";
28 // ---------- zoom control on current window ----------
31 if (!current_view) return 0.0;
33 current_view->ev_zoom = fixmul(current_view->ev_zoom,62259);
34 current_view->ev_changed = 1;
40 if (!current_view) return 0.0;
42 current_view->ev_zoom = fixmul(current_view->ev_zoom,68985);
43 current_view->ev_changed = 1;
47 // ---------- distance-of-viewer control on current window ----------
50 if (!current_view) return 0.0;
52 current_view->ev_dist = fixmul(current_view->ev_dist,62259);
53 current_view->ev_changed = 1;
59 if (!current_view) return 0.0;
61 current_view->ev_dist = fixmul(current_view->ev_dist,68985);
62 current_view->ev_changed = 1;
66 // ---------- Toggle chase mode. ----------
70 Funky_chase_mode = !Funky_chase_mode;
71 set_view_target_from_segment(Cursegp);
72 if (Funky_chase_mode == 1) {
73 diagnostic_message("Chase mode ON.");
75 if (Funky_chase_mode == 0) {
76 diagnostic_message("Chase mode OFF.");
78 return Funky_chase_mode;