fltk/test/doublebuffer.cxx
Michael R Sweet 4b561b6e90 Updated copyright notices for all of the 1.0.x files.
Updated the configure script for *BSD and GCC 2.95 (-fno-exceptions)

Added install rule to documentation directory.

Dumped old packages directory; added traditional RPM spec file and EPM
list file (that replace all of the packages stuff)

The FLUID man page is now "fluid.1" for the formatted page and "fluid.man"
for the non-formatted page, since only IRIX uses pack'd formatted man pages.

Whew!


git-svn-id: file:///fltk/svn/fltk/branches/branch-1.0@1090 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
2000-04-25 22:17:00 +00:00

127 lines
4.0 KiB
C++

//
// "$Id: doublebuffer.cxx,v 1.4.2.1 2000/04/25 22:16:53 mike Exp $"
//
// 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 1998-2000 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".
//
#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() {
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();
w1.show();
w02.show();
w2.show();
return Fl::run();
}
//
// End of "$Id: doublebuffer.cxx,v 1.4.2.1 2000/04/25 22:16:53 mike Exp $".
//