Here's a crude demo.
Not quite what the OP wanted, as I am not setting a static image for the
button. Instead, I am animating a bar-graph on the button, then writing
some text over the top of that.
Think it should give enough ideas for a proper implementation of the
OP's query, though!
Beware the mail system munging up my lines, as per usual...
----------------------
// bar-graph-button.cxx
// fltk-config --compile bar-graph-button.cxx
//
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Button.H>
#include <FL/fl_draw.H>
#include <stdio.h>
static int bar_val = 0;
class bar_graph: public Fl_Button {
void draw();
public:
bar_graph(int x, int y,int w,int h, const char *l=0) : Fl_Button
(x,y,w,h,l) {}
};
void bar_graph::draw() {
Fl_Button::draw();
int wd = w() - 12; int ht = h() - 12;
int xo = x() + 6; int yo = y() + 6;
fl_color(FL_BLACK);
fl_push_clip(xo, yo, wd, ht);
fl_rectf(xo, yo, wd, ht);
fl_color(FL_BLUE);
int bw = (wd * bar_val) / 100;
fl_rectf(xo, yo, bw, ht);
char lbl[8];
snprintf(lbl, 8, "%d", bar_val);
fl_color(FL_WHITE);
fl_font(FL_HELVETICA, 18);
fl_draw(lbl, (xo + wd/2), (yo + 5 + ht/2));
fl_pop_clip();
} /* end of draw() method */
static bar_graph *bar1 = 0;
void update_bar1(void *){
static int bar_step = 1;
bar_val += bar_step;
if(bar_val > 99)
bar_step = -1;
if(bar_val < 1)
bar_step = +1;
Fl::repeat_timeout(0.05, update_bar1);
bar1->redraw();
}
static void cb_button(Fl_Widget*, void*) {
puts("Hello!"); fflush(stdout);
}
static Fl_Double_Window *main_win;
static void cb_quit(Fl_Widget*, void*) {
main_win->hide();
}
int main(int argc, char **argv) {
main_win = new Fl_Double_Window(400, 210, "Bar Test Window");
main_win->begin();
bar1 = new bar_graph(20, 20, 360, 50);
bar1->callback(cb_button);
Fl_Button *quit_b = new Fl_Button(320, 90, 60, 50, "Quit");
quit_b->callback(cb_quit);
main_win->end();
main_win->show(argc, argv);
Fl::add_timeout(0.1, update_bar1);
return Fl::run();
}
/* end of file */
SELEX Sensors and Airborne Systems Limited
Registered Office: Sigma House, Christopher Martin Road, Basildon, Essex SS14
3EL
A company registered in England & Wales. Company no. 02426132
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