test/doublebuffer.cxx

   1 //
   2 // "$Id: doublebuffer.cxx 7903 2010-11-28 21:06:39Z matt $"
   3 //
   4 // Double-buffering test program for the Fast Light Tool Kit (FLTK).
   5 //
   6 // This demo shows how double buffering helps, by drawing the
   7 // window in a particularily bad way.
   8 //
   9 // The single-buffered window will blink as it updates.  The
  10 // double buffered one will not.  It will take just as long
  11 // (or longer) to update, but often it will appear to be faster.
  12 //
  13 // This demo should work for both the GL and X versions of Fl,
  14 // even though the double buffering mechanism is totally different.
  15 //
  16 // Copyright 1998-2010 by Bill Spitzak and others.
  17 //
  18 // This library is free software; you can redistribute it and/or
  19 // modify it under the terms of the GNU Library General Public
  20 // License as published by the Free Software Foundation; either
  21 // version 2 of the License, or (at your option) any later version.
  22 //
  23 // This library is distributed in the hope that it will be useful,
  24 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  25 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  26 // Library General Public License for more details.
  27 //
  28 // You should have received a copy of the GNU Library General Public
  29 // License along with this library; if not, write to the Free Software
  30 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  31 // USA.
  32 //
  33 // Please report all bugs and problems on the following page:
  34 //
  35 //     http://www.fltk.org/str.php
  36 //
  37
  38 #include <FL/Fl.H>
  39 #include <FL/Fl_Single_Window.H>
  40 #include <FL/Fl_Double_Window.H>
  41 #include <FL/Fl_Box.H>
  42 #include <FL/fl_draw.H>
  43 #include <FL/Fl_Hor_Slider.H>
  44 #include <stdlib.h>
  45 #include <FL/math.h>
  46 #include <stdio.h>
  47
  48 // this purposely draws each line 10 times to be slow:
  49 void star(int w, int h, int n) {
  50   fl_push_matrix();
  51   fl_translate(w/2, h/2);
  52   fl_scale(w/2, h/2);
  53   for (int i = 0; i < n; i++) {
  54     for (int j = i+1; j < n; j++)/* for (int k=0; k<10; k++)*/ {
  55       fl_begin_line();
  56       fl_vertex(cos(2*M_PI*i/n+.1), sin(2*M_PI*i/n+.1));
  57       fl_vertex(cos(2*M_PI*j/n+.1), sin(2*M_PI*j/n+.1));
  58       fl_end_line();
  59     }
  60   }
  61   fl_pop_matrix();
  62 }
  63
  64 int sides[2] = {20,20};
  65
  66 void slider_cb(Fl_Widget* o, long v) {
  67   sides[v] = int(((Fl_Slider*)o)->value());
  68   o->parent()->redraw();
  69 }
  70
  71 void bad_draw(int w,int h,int which) {
  72 //   for (int i=0; i<10; i++) {
  73 //     fl_color(7); fl_rectf(0,0,w,h); fl_color(0); star(w,h);
  74 //     fl_color(0); fl_rectf(0,0,w,h); fl_color(7); star(w,h);
  75 //   }
  76   fl_color(FL_BLACK); fl_rectf(0,0,w,h);
  77   fl_color(FL_WHITE); star(w,h,sides[which]);
  78   //  for (int x=0; x<sides[which]; x++) for (int y=0; y<sides[which]; y++)
  79   //fl_draw_box(FL_UP_BOX, 10*x, 10*y, 25,25, FL_GRAY);
  80 }
  81
  82 class single_blink_window : public Fl_Single_Window {
  83   void draw() {bad_draw(w(),h(),0); draw_child(*child(0));}
  84 public:
  85   single_blink_window(int x, int y,int w,int h,const char *l)
  86     : Fl_Single_Window(x,y,w,h,l) {resizable(this);}
  87 };
  88
  89 class double_blink_window : public Fl_Double_Window {
  90   void draw() {bad_draw(w(),h(),1); draw_child(*child(0));}
  91 public:
  92   double_blink_window(int x, int y, int w,int h,const char *l)
  93     : Fl_Double_Window(x,y,w,h,l) {resizable(this);}
  94 };
  95
  96 int main(int argc, char **argv) {
  97   if (!Fl::visual(FL_DOUBLE))
  98     printf("Xdbe not supported, faking double buffer with pixmaps.\n");
  99   Fl_Window w01(420,420,"Fl_Single_Window"); w01.box(FL_FLAT_BOX);
 100   single_blink_window w1(10,10,400,400,"Fl_Single_Window");
 101   w1.box(FL_FLAT_BOX); w1.color(FL_BLACK); //w1.position(100,200);
 102   Fl_Hor_Slider slider0(20,370,360,25);
 103   slider0.range(2,30);
 104   slider0.step(1);
 105   slider0.value(sides[0]);
 106   slider0.callback(slider_cb, 0);
 107   w1.end();
 108   w01.end();
 109   Fl_Window w02(420,420,"Fl_Double_Window"); w02.box(FL_FLAT_BOX);
 110   double_blink_window w2(10,10,400,400,"Fl_Double_Window");
 111   w2.box(FL_FLAT_BOX); w2.color(FL_BLACK); //w2.position(600,200);
 112   Fl_Hor_Slider slider1(20,370,360,25);
 113   slider1.range(2,30);
 114   slider1.step(1);
 115   slider1.value(sides[0]);
 116   slider1.callback(slider_cb, 1);
 117   w2.end();
 118   w02.end();
 119   w01.show(argc, argv);
 120   w1.show();
 121   w02.show();
 122   w2.show();
 123   return Fl::run();
 124 }
 125
 126 //
 127 // End of "$Id: doublebuffer.cxx 7903 2010-11-28 21:06:39Z matt $".
 128 //