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/**
* Generate random pulses
*
* $Id: SCA_RandomSensor.cpp 14444 2008-04-16 22:40:48Z hos $
*
* ***** BEGIN GPL LICENSE BLOCK *****
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
* All rights reserved.
*
* The Original Code is: all of this file.
*
* Contributor(s): none yet.
*
* ***** END GPL LICENSE BLOCK *****
*/
#include "SCA_RandomSensor.h"
#include "SCA_EventManager.h"
#include "SCA_RandomEventManager.h"
#include "SCA_LogicManager.h"
#include "ConstExpr.h"
#include <iostream>
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/* ------------------------------------------------------------------------- */
/* Native functions */
/* ------------------------------------------------------------------------- */
SCA_RandomSensor::SCA_RandomSensor(SCA_EventManager* eventmgr,
SCA_IObject* gameobj,
int startseed,
PyTypeObject* T)
: SCA_ISensor(gameobj,eventmgr, T)
{
m_iteration = 0;
m_interval = 0;
m_lastdraw = false;
// m_basegenerator is never deleted => memory leak
m_basegenerator = new SCA_RandomNumberGenerator(startseed);
m_currentDraw = m_basegenerator->Draw();
//registration is done globally, don't do it here
//Note: it was probably done to work around a bug in Evaluate(). It is now fixed
//RegisterToManager();
}
SCA_RandomSensor::~SCA_RandomSensor()
{
/* Nothing to be done here. */
}
CValue* SCA_RandomSensor::GetReplica()
{
CValue* replica = new SCA_RandomSensor(*this);
// replication copies m_basegenerator pointer => share same generator
// this will copy properties and so on...
CValue::AddDataToReplica(replica);
return replica;
}
bool SCA_RandomSensor::IsPositiveTrigger()
{
return (m_invert !=m_lastdraw);
}
bool SCA_RandomSensor::Evaluate(CValue* event)
{
/* Random generator is the generator from Line 25 of Table 1 in */
/* [KNUTH 1981, The Art of Computer Programming Vol. 2 */
/* (2nd Ed.), pp102] */
/* It's a very simple max. length sequence generator. We can */
/* draw 32 bool values before having to generate the next */
/* sequence value. There are some theorems that will tell you */
/* this is a reasonable way of generating bools. Check Knuth. */
/* Furthermore, we only draw each <delay>-eth frame. */
bool evaluateResult = false;
if (++m_interval > m_pulse_frequency) {
bool drawResult = false;
m_interval = 0;
if (m_iteration > 31) {
m_currentDraw = m_basegenerator->Draw();
drawResult = (m_currentDraw & 0x1) == 0;
m_iteration = 1;
} else {
drawResult = ((m_currentDraw >> m_iteration) & 0x1) == 0;
m_iteration++;
}
evaluateResult = drawResult != m_lastdraw;
m_lastdraw = drawResult;
}
/* now pass this result to some controller */
return evaluateResult;
}
/* ------------------------------------------------------------------------- */
/* Python functions */
/* ------------------------------------------------------------------------- */
/* Integration hooks ------------------------------------------------------- */
PyTypeObject SCA_RandomSensor::Type = {
PyObject_HEAD_INIT(&PyType_Type)
0,
"SCA_RandomSensor",
sizeof(SCA_RandomSensor),
0,
PyDestructor,
0,
__getattr,
__setattr,
0, //&MyPyCompare,
__repr,
0, //&cvalue_as_number,
0,
0,
0,
0
};
PyParentObject SCA_RandomSensor::Parents[] = {
&SCA_RandomSensor::Type,
&SCA_ISensor::Type,
&SCA_ILogicBrick::Type,
&CValue::Type,
NULL
};
PyMethodDef SCA_RandomSensor::Methods[] = {
{"setSeed", (PyCFunction) SCA_RandomSensor::sPySetSeed, METH_VARARGS, SetSeed_doc},
{"getSeed", (PyCFunction) SCA_RandomSensor::sPyGetSeed, METH_VARARGS, GetSeed_doc},
{"getLastDraw", (PyCFunction) SCA_RandomSensor::sPyGetLastDraw, METH_VARARGS, GetLastDraw_doc},
{NULL,NULL} //Sentinel
};
PyObject* SCA_RandomSensor::_getattr(const STR_String& attr) {
_getattr_up(SCA_ISensor);
}
/* 1. setSeed */
char SCA_RandomSensor::SetSeed_doc[] =
"setSeed(seed)\n"
"\t- seed: integer\n"
"\tSet the initial seed of the generator. Equal seeds produce\n"
"\tequal series. If the seed is 0, the generator will produce\n"
"\tthe same value on every call.\n";
PyObject* SCA_RandomSensor::PySetSeed(PyObject* self, PyObject* args, PyObject* kwds) {
long seedArg;
if(!PyArg_ParseTuple(args, "i", &seedArg)) {
return NULL;
}
m_basegenerator->SetSeed(seedArg);
Py_Return;
}
/* 2. getSeed */
char SCA_RandomSensor::GetSeed_doc[] =
"getSeed()\n"
"\tReturns the initial seed of the generator. Equal seeds produce\n"
"\tequal series.\n";
PyObject* SCA_RandomSensor::PyGetSeed(PyObject* self, PyObject* args, PyObject* kwds) {
return PyInt_FromLong(m_basegenerator->GetSeed());
}
/* 3. getLastDraw */
char SCA_RandomSensor::GetLastDraw_doc[] =
"getLastDraw()\n"
"\tReturn the last value that was drawn.\n";
PyObject* SCA_RandomSensor::PyGetLastDraw(PyObject* self, PyObject* args, PyObject* kwds) {
return PyInt_FromLong(m_lastdraw);
}
/* eof */
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