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-//
-// "$Id$"
-//
-// Double-buffering test program for the Fast Light Tool Kit (FLTK).
-//
-// This demo shows how double buffering helps, by drawing the
-// window in a particularily bad way.
-//
-// The single-buffered window will blink as it updates. The
-// double buffered one will not. It will take just as long
-// (or longer) to update, but often it will appear to be faster.
-//
-// This demo should work for both the GL and X versions of Fl,
-// even though the double buffering mechanism is totally different.
-//
-// Copyright 1998-2010 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 on the following page:
-//
-// http://www.fltk.org/str.php
-//
-
-#include <FL/Fl.H>
-#include <FL/Fl_Single_Window.H>
-#include <FL/Fl_Double_Window.H>
-#include <FL/Fl_Box.H>
-#include <FL/fl_draw.H>
-#include <FL/Fl_Hor_Slider.H>
-#include <stdlib.h>
-#include <FL/math.h>
-#include <stdio.h>
-
-// this purposely draws each line 10 times to be slow:
-void star(int w, int h, int n) {
- fl_push_matrix();
- fl_translate(w/2, h/2);
- fl_scale(w/2, h/2);
- for (int i = 0; i < n; i++) {
- for (int j = i+1; j < n; j++)/* for (int k=0; k<10; k++)*/ {
- fl_begin_line();
- fl_vertex(cos(2*M_PI*i/n+.1), sin(2*M_PI*i/n+.1));
- fl_vertex(cos(2*M_PI*j/n+.1), sin(2*M_PI*j/n+.1));
- fl_end_line();
- }
- }
- fl_pop_matrix();
-}
-
-int sides[2] = {20,20};
-
-void slider_cb(Fl_Widget* o, long v) {
- sides[v] = int(((Fl_Slider*)o)->value());
- o->parent()->redraw();
-}
-
-void bad_draw(int w,int h,int which) {
-// for (int i=0; i<10; i++) {
-// fl_color(7); fl_rectf(0,0,w,h); fl_color(0); star(w,h);
-// fl_color(0); fl_rectf(0,0,w,h); fl_color(7); star(w,h);
-// }
- fl_color(FL_BLACK); fl_rectf(0,0,w,h);
- fl_color(FL_WHITE); star(w,h,sides[which]);
- // for (int x=0; x<sides[which]; x++) for (int y=0; y<sides[which]; y++)
- //fl_draw_box(FL_UP_BOX, 10*x, 10*y, 25,25, FL_GRAY);
-}
-
-class single_blink_window : public Fl_Single_Window {
- void draw() {bad_draw(w(),h(),0); draw_child(*child(0));}
-public:
- single_blink_window(int x, int y,int w,int h,const char *l)
- : Fl_Single_Window(x,y,w,h,l) {resizable(this);}
-};
-
-class double_blink_window : public Fl_Double_Window {
- void draw() {bad_draw(w(),h(),1); draw_child(*child(0));}
-public:
- double_blink_window(int x, int y, int w,int h,const char *l)
- : Fl_Double_Window(x,y,w,h,l) {resizable(this);}
-};
-
-int main(int argc, char **argv) {
- if (!Fl::visual(FL_DOUBLE))
- printf("Xdbe not supported, faking double buffer with pixmaps.\n");
- Fl_Window w01(420,420,"Fl_Single_Window"); w01.box(FL_FLAT_BOX);
- single_blink_window w1(10,10,400,400,"Fl_Single_Window");
- w1.box(FL_FLAT_BOX); w1.color(FL_BLACK); //w1.position(100,200);
- Fl_Hor_Slider slider0(20,370,360,25);
- slider0.range(2,30);
- slider0.step(1);
- slider0.value(sides[0]);
- slider0.callback(slider_cb, 0);
- w1.end();
- w01.end();
- Fl_Window w02(420,420,"Fl_Double_Window"); w02.box(FL_FLAT_BOX);
- double_blink_window w2(10,10,400,400,"Fl_Double_Window");
- w2.box(FL_FLAT_BOX); w2.color(FL_BLACK); //w2.position(600,200);
- Fl_Hor_Slider slider1(20,370,360,25);
- slider1.range(2,30);
- slider1.step(1);
- slider1.value(sides[0]);
- slider1.callback(slider_cb, 1);
- w2.end();
- w02.end();
- w01.show(argc, argv);
- w1.show();
- w02.show();
- w2.show();
- return Fl::run();
-}
-
-//
-// End of "$Id$".
-//