#include <iostream>
#include <cmath>
#include <FL/Fl.H>
#include <FL/Fl_Window.H>
#include <FL/Fl_Box.H>
#include <FL/Fl_Input.H>
#include <FL/Fl_Multiline_Input.H>
#include <FL/Fl_Scroll.H>
#include <FL/Fl_Image.H>
#include <FL/Fl_draw.H>

using namespace std;

const int WIDTH=1000,HEIGHT=1000;


Fl_Window *window;
Fl_Scroll *drawscroll;
Fl_Box *drawimagebox;
Fl_RGB_Image *drawimage;
Fl_Input *cmdinput;
uchar *imagebuf;


const uchar* someimg(void){
	uchar *buf=new uchar[3*WIDTH*HEIGHT];
	int x,y;
	for(y=0;y<HEIGHT;y++){
		for(x=0;x<WIDTH;x++){
			buf[(WIDTH*y+x)*3+0]=(int)sqrt((999-x)*(999-x)+y*y)/100*20;
			buf[(WIDTH*y+x)*3+1]=(int)sqrt(x*x+y*y)/100*20;
			buf[(WIDTH*y+x)*3+2]=(int)sqrt((500-x)*(500-x)+(0-y)*(0-y))/100*20;
		}
	}
	return buf;
}

void maincallback(Fl_Widget*,void*){
	if(Fl::event()==FL_SHORTCUT&&Fl::event_key()==FL_Escape)return;
	exit(0);
}

void cmdinputcallback(Fl_Widget *wid){
	Fl_Input *inp=(Fl_Input*)wid;
	cout<<inp->value()<<endl;
	inp->value(NULL);
}

int main(int argc,char **argv){
	window=new Fl_Window(1016,700);
	Fl_Group::current(0);

	imagebuf=new uchar[WIDTH*HEIGHT*3];
	memset(imagebuf,255,WIDTH*HEIGHT*3*sizeof(uchar));

	drawscroll=new Fl_Scroll(0,0,window->w(),window->h()-150);
		drawimagebox=new Fl_Box(0,0,WIDTH,HEIGHT);
			drawimage=new Fl_RGB_Image(imagebuf,WIDTH,HEIGHT);
			drawimagebox->image(drawimage);
		drawscroll->add(drawimagebox);
	window->add(drawscroll);

	cmdinput=new Fl_Input(0,window->h()-25,window->w()-150,25);
		cmdinput->when(FL_WHEN_ENTER_KEY|FL_WHEN_NOT_CHANGED);
		cmdinput->callback(cmdinputcallback);
	window->add(cmdinput);

	window->resizable(drawscroll);

	window->end();
	Fl::visual(FL_RGB);
	//window->callback(maincallback); //disable esc window closing
	window->show(argc,argv);
	return Fl::run();
}