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/*
* File: .cc
* Summary:
*/
#include "AppHdr.h"
#include <cmath>
#include "ray.h"
#include "geom2d.h"
static geom::grid diamonds(geom::lineseq(1, 1, 0.5, 1),
geom::lineseq(1, -1, -0.5, 1));
static int ifloor(double d)
{
return static_cast<int>(floor(d));
}
coord_def ray_def::pos() const
{
// TODO: Assert we're in a central diamond.
int x = ifloor(r.start.x);
int y = ifloor(r.start.y);
return (coord_def(x, y));
}
bool ray_def::advance()
{
return (geom::nextcell(r, diamonds, true)
&& geom::nextcell(r, diamonds, false));
}
void ray_def::advance_and_bounce()
{
// XXX
r.dir *= -1;
}
void ray_def::regress()
{
r.dir *= -1;
advance();
r.dir *= -1;
}
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