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