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- //
- // "$Id: fl_overlay.cxx,v 1.4 1999/01/07 19:17:40 mike Exp $"
- //
- // Overlay support for the Fast Light Tool Kit (FLTK).
- //
- // Copyright 1998-1999 by Bill Spitzak and others.
- //
- // This library is free software; you can redistribute it and/or
- // modify it under the terms of the GNU Library General Public
- // License as published by the Free Software Foundation; either
- // version 2 of the License, or (at your option) any later version.
- //
- // This library is distributed in the hope that it will be useful,
- // but WITHOUT ANY WARRANTY; without even the implied warranty of
- // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- // Library General Public License for more details.
- //
- // You should have received a copy of the GNU Library General Public
- // License along with this library; if not, write to the Free Software
- // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- // USA.
- //
- // Please report all bugs and problems to "fltk-bugs@easysw.com".
- //
-
- // Extremely limited "overlay" support. You can use this to drag out
- // a rectangle in response to mouse events. It is your responsibility
- // to erase the overlay before drawing anything that might intersect
- // it.
-
- #include <FL/x.H>
- #include <FL/fl_draw.H>
-
- static int px,py,pw,ph;
-
- static void draw_current_rect() {
- #ifdef WIN32
- int old = SetROP2(fl_gc, R2_NOT);
- fl_rect(px, py, pw, ph);
- SetROP2(fl_gc, old);
- #else
- XSetFunction(fl_display, fl_gc, GXxor);
- XSetForeground(fl_display, fl_gc, 0xffffffff);
- XDrawRectangle(fl_display, fl_window, fl_gc, px, py, pw, ph);
- XSetFunction(fl_display, fl_gc, GXcopy);
- #endif
- }
-
- void fl_overlay_clear() {
- if (pw > 0) {draw_current_rect(); pw = 0;}
- }
-
- void fl_overlay_rect(int x, int y, int w, int h) {
- if (w < 0) {x += w; w = -w;} else if (!w) w = 1;
- if (h < 0) {y += h; h = -h;} else if (!h) h = 1;
- if (pw > 0) {
- if (x==px && y==py && w==pw && h==ph) return;
- draw_current_rect();
- }
- px = x; py = y; pw = w; ph = h;
- draw_current_rect();
- }
-
- //
- // End of "$Id: fl_overlay.cxx,v 1.4 1999/01/07 19:17:40 mike Exp $".
- //
-