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// * This file is part of the COLOBOT source code
// * Copyright (C) 2001-2008, Daniel ROUX & EPSITEC SA, www.epsitec.ch
// *
// * 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 3 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, see http://www.gnu.org/licenses/.
#include "object/task/taskadvance.h"
#include "math/geometry.h"
#include "physics/physics.h"
// Object's constructor.
CTaskAdvance::CTaskAdvance(CObject* object) : CTask(object)
{
}
// Object's destructor.
CTaskAdvance::~CTaskAdvance()
{
}
// Management of an event.
bool CTaskAdvance::EventProcess(const Event &event)
{
if ( m_engine->GetPause() ) return true;
if ( event.type != EVENT_FRAME ) return true;
m_fixTime += event.rTime;
// Momentarily stationary object (ant on the back)?
if ( m_object->GetFixed() )
{
m_physics->SetMotorSpeedX(0.0f); // stops the advance
m_physics->SetMotorSpeedZ(0.0f); // stops the rotation
m_bError = true;
return true;
}
m_timeLimit -= event.rTime;
return true;
}
// Assigns the goal was achieved.
Error CTaskAdvance::Start(float length)
{
m_direction = (length>=0.0f)?1.0f:-1.0f;
m_totalLength = fabs(length);
m_advanceLength = m_physics->GetLinLength(length);
m_startPos = m_object->GetPosition(0);
m_lastDist = 0.0f;
m_fixTime = 0.0f;
m_timeLimit = m_physics->GetLinTimeLength(m_totalLength, m_direction)*3.0f;
if ( m_timeLimit < 2.0f ) m_timeLimit = 2.0f;
m_physics->SetMotorSpeedX(m_direction*1.0f); // forward/backward
m_physics->SetMotorSpeedY(0.0f);
m_physics->SetMotorSpeedZ(0.0f);
m_bError = false;
return ERR_OK;
}
// Indicates whether the action is finished.
Error CTaskAdvance::IsEnded()
{
Math::Vector pos;
float length;
if ( m_engine->GetPause() ) return ERR_CONTINUE;
if ( m_bError )
{
return ERR_STOP;
}
if ( m_timeLimit < 0.0f )
{
m_physics->SetMotorSpeedX(0.0f);
return ERR_MOVE_IMPOSSIBLE;
}
pos = m_object->GetPosition(0);
length = Math::DistanceProjected(pos, m_startPos);
if ( length > m_lastDist ) // forward?
{
m_fixTime = 0.0f;
}
else // still stands?
{
if ( m_fixTime > 1.0f ) // for more than a second?
{
m_physics->SetMotorSpeedX(0.0f);
return ERR_MOVE_IMPOSSIBLE;
}
}
m_lastDist = length;
if ( length >= m_totalLength )
{
m_physics->SetMotorSpeedX(0.0f);
m_physics->SetLinMotionX(MO_CURSPEED, 0.0f);
if ( length != 0.0f )
{
pos = m_startPos+((pos-m_startPos)*m_totalLength/length);
m_object->SetPosition(0, pos);
}
return ERR_STOP;
}
if ( length >= m_advanceLength )
{
m_physics->SetMotorSpeedX(m_direction*0.1f);
}
return ERR_CONTINUE;
}
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