#include "paint.h"

Point sdim;	/* the dimensions of a sector in pixels */
Point gdim;	/* the dimensions of the grid in sectors */
int nbits, nbytes;

static int
init(Widget *w)
{
	Canvas *c;
	Point wdim;
	
	c = w->aux;
	sdim = Pt(32, 32);
	wdim = subpt(w->r.max, w->r.min);
	gdim.x = (wdim.x + sdim.x - 1) / sdim.x;
	gdim.y = (wdim.y + sdim.y - 1) / sdim.y;
	nbits = gdim.x * gdim.y;
	nbytes = (nbits + 7) / 8;

	fprint(2, "%P	%P	%P bits %d	bytes %d\n",
		c->img->r.max, wdim, gdim, nbits, nbytes);
	return 0;
}

static int
mouse(Widget *w, Mousectl *mctl)
{
	Point mempt, sec;
	int bit, byte;
	uchar mask;

	if(!mctl->buttons)
		return 0;

	while(mctl->buttons)
		readmouse(mctl);

	mempt = stompt(mctl->xy, w);
	sec.x = (mempt.x < 0 ? mempt.x - sdim.x : mempt.x) / sdim.x;
	sec.y = (mempt.y < 0 ? mempt.y - sdim.y : mempt.y) / sdim.y;
	bit = sec.y * gdim.x + sec.x;
	byte = bit / 8;
	mask = 0x80 >> bit - byte*8;

	fprint(2, "	s %P	m %P	se %P	b %d	map[%d] & %.2uhhx	%s\n",
		mctl->xy, mempt, sec, bit, byte, mask, ptinrect(sec, Rpt(ZP, gdim)) ? "inside" : "outside" );

	return 0;
}

CanvasTool probe = {
	mouse,
	init,
};