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//
// "$Id: fl_overlay.cxx,v 1.4.2.3.2.6 2004/08/31 22:00:48 matthiaswm Exp $"
//
// Overlay support for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2004 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@fltk.org".
//
// 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>
#ifdef __APPLE__
#include <config.h>
#endif
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);
#elif defined(__APPLE_QD__)
PenMode( patXor );
fl_rect(px, py, pw, ph);
PenMode( patCopy );
#elif defined(__APPLE_QUARTZ__)
// warning: Quartz does not support xor drawing
// Use the Fl_Overlay_Window instead.
fl_rect(px, py, pw, ph);
#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 1.4.2.3.2.6 2004/08/31 22:00:48 matthiaswm Exp $".
//
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