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