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/**************************************************************************/
/* Copyright 2012 Tim Day */
/* */
/* This file is part of Evolvotron */
/* */
/* Evolvotron is free software: you can redistribute it and/or modify */
/* it under the terms of the GNU General Public License as published by */
/* the Free Software Foundation, either version 3 of the License, or */
/* (at your option) any later version. */
/* */
/* Evolvotron is distributed in the hope that it will be useful, */
/* but WITHOUT ANY WARRANTY; without even the implied warranty of */
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU General Public License for more details. */
/* */
/* You should have received a copy of the GNU General Public License */
/* along with Evolvotron. If not, see <http://www.gnu.org/licenses/>. */
/**************************************************************************/
/*! \file
\brief Interfaces and implementation for specific Function classes.
*/
#ifndef _functions_friezegroup_step_h_
#define _functions_friezegroup_step_h_
#include "common.h"
#include "function_boilerplate.h"
#include "friezegroup.h"
//! Step (Conway p1a1): glide reflection only.
/*! Sawtooth x, out of step by half range across y-axis.
\verbatim
o o
--- ---
--- ---
o o
\endverbatim
*/
struct Step
{
const XY operator()(const XY& p) const
{
return XY
(
(p.y()>0.0 ? modulusf(p.x(),1.0) : modulusf(p.x()+0.5,1.0)),
fabs(p.y())
);
}
};
struct StepInvariant;
struct StepBlend;
//------------------------------------------------------------------------------------------
FUNCTION_BEGIN(FunctionFriezeGroupStepFreeZ,0,1,false,FnStructure)
virtual const XYZ evaluate(const XYZ& p) const
{
return FriezegroupEvaluate(arg(0),p,Step(),FreeZ());
}
FUNCTION_END(FunctionFriezeGroupStepFreeZ)
//------------------------------------------------------------------------------------------
FUNCTION_BEGIN(FunctionFriezeGroupStepClampZ,1,1,false,FnStructure)
virtual const XYZ evaluate(const XYZ& p) const
{
return FriezegroupEvaluate(arg(0),p,Step(),ClampZ(param(0)));
}
FUNCTION_END(FunctionFriezeGroupStepClampZ)
//------------------------------------------------------------------------------------------
#endif
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