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//-----------------------------------------------------------------------------
/** @file libpentobi_base/GembloQTransform.cpp
@author Markus Enzenberger
@copyright GNU General Public License version 3 or later */
//-----------------------------------------------------------------------------
#include "GembloQTransform.h"
#include "libboardgame_base/MathUtil.h"
namespace libpentobi_base {
using libboardgame_base::mod;
//-----------------------------------------------------------------------------
namespace
{
/** Divide integer by 2 and round down. */
int div2(int a)
{
return a < 0 ? (a - 1) / 2 : a / 2;
}
} // namespace
//-----------------------------------------------------------------------------
CoordPoint TransfGembloQIdentity::get_transformed(CoordPoint p) const
{
return p;
}
//-----------------------------------------------------------------------------
CoordPoint TransfGembloQRot90::get_transformed(CoordPoint p) const
{
auto y = div2(p.x);
auto x = -2 * p.y;
switch (mod(p.x, 4))
{
case 0:
case 3:
x -= static_cast<int>(p.y % 2 != 0);
break;
case 1:
case 2:
x -= static_cast<int>(p.y % 2 == 0);
break;
}
return {x, y};
}
//-----------------------------------------------------------------------------
CoordPoint TransfGembloQRot180::get_transformed(CoordPoint p) const
{
return {-p.x, -p.y};
}
//-----------------------------------------------------------------------------
CoordPoint TransfGembloQRot270::get_transformed(CoordPoint p) const
{
auto y = -div2(p.x);
auto x = 2 * p.y;
switch (mod(p.x, 4))
{
case 0:
case 3:
x += static_cast<int>(p.y % 2 != 0);
break;
case 1:
case 2:
x += static_cast<int>(p.y % 2 == 0);
break;
}
return {x, y};
}
//-----------------------------------------------------------------------------
CoordPoint TransfGembloQRefl::get_transformed(CoordPoint p) const
{
return {-p.x, p.y};
}
//-----------------------------------------------------------------------------
CoordPoint TransfGembloQRot90Refl::get_transformed(CoordPoint p) const
{
auto y = -div2(p.x);
auto x = -2 * p.y;
switch (mod(p.x, 4))
{
case 0:
case 3:
x -= static_cast<int>(p.y % 2 != 0);
break;
case 1:
case 2:
x -= static_cast<int>(p.y % 2 == 0);
break;
}
return {x, y};
}
//-----------------------------------------------------------------------------
CoordPoint TransfGembloQRot180Refl::get_transformed(CoordPoint p) const
{
return {p.x, -p.y};
}
//-----------------------------------------------------------------------------
CoordPoint TransfGembloQRot270Refl::get_transformed(CoordPoint p) const
{
auto y = div2(p.x);
auto x = 2 * p.y;
switch (mod(p.x, 4))
{
case 0:
case 3:
x += static_cast<int>(p.y % 2 != 0);
break;
case 1:
case 2:
x += static_cast<int>(p.y % 2 == 0);
break;
}
return {x, y};
}
//-----------------------------------------------------------------------------
} // namespace libpentobi_base
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