pacman.cpp

// pacman.cpp	- Implementation of CPacman
//
// WinDirStat - Directory Statistics
// Copyright (C) 2003-2004 Bernhard Seifert
//
// 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
//
// Author: bseifert@users.sourceforge.net, bseifert@daccord.net
//
// Last modified: $Date: 2004/11/05 16:53:07 $

#include "stdafx.h"
#include "pacman.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

namespace
{
	DWORD UPDATEINTERVAL = 40;	// ms
	double MOUTHSPEED = 0.0030;	// aperture alteration / ms
}

CPacman::CPacman()
{
	m_isWindows9x= PlatformIsWindows9x();
	m_bgcolor= GetSysColor(COLOR_WINDOW);
	m_readJobs= 0;
	m_speed= 0.0005;
	m_moving= false;
	m_lastUpdate= 0;
	Reset();
}

void CPacman::Reset()
{
	m_toTheRight= true;
	m_position= 0;
	m_mouthOpening= true;
	m_aperture= 0;
}

void CPacman::SetBackgroundColor(COLORREF color)
{
	m_bgcolor= color;
}

void CPacman::SetSpeed(double speed)
{
	m_speed= speed;
}

void CPacman::Start(bool start)
{
	m_moving= start;
	m_lastUpdate= GetTickCount();
}

bool CPacman::Drive(LONGLONG readJobs)
{
	m_readJobs= (double)readJobs;

	if (!m_moving)
		return false;

	DWORD now= GetTickCount();
	DWORD delta= now - m_lastUpdate;

	if (delta < UPDATEINTERVAL)
		return false;

	m_lastUpdate= now;

	UpdatePosition(m_position, m_toTheRight, m_speed * delta);
	UpdatePosition(m_aperture, m_mouthOpening, MOUTHSPEED * delta);

	return true;
}

void CPacman::Draw(CDC *pdc, const CRect& rect)
{
	pdc->FillSolidRect(rect, m_bgcolor);
	
	CRect rc= rect;
	rc.DeflateRect(5, 1);

	if (rc.Height() % 2 == 0)
		rc.bottom--;

	int diameter= rc.Height();

	int left= rc.left + (int)(m_position * (rc.Width() - diameter));
	rc.left= left;
	rc.right= left + diameter;

	CPen pen(PS_SOLID, 1, RGB(0,0,0));
	CSelectObject sopen(pdc, &pen);

	CBrush brush(CalculateColor());
	CSelectObject sobrush(pdc, &brush);

	CPoint ptStart;
	CPoint ptEnd;
	int hmiddle= rc.top + diameter / 2;

	int mouthcy= (int)(m_aperture * m_aperture * diameter);
	int upperMouthcy= mouthcy;
	int lowerMouthcy= mouthcy;

	// It's the sad truth, that CDC::Pie() behaves different on
	// Windows 9x than on NT.
	if (!m_isWindows9x)
		lowerMouthcy++;

	if (m_toTheRight)
	{
		ptStart.x= ptEnd.x= rc.right;
		ptStart.y	= hmiddle - upperMouthcy;
		ptEnd.y		= hmiddle + lowerMouthcy;
	}
	else
	{
		ptStart.x= ptEnd.x= rc.left;
		ptStart.y	= hmiddle + lowerMouthcy;
		ptEnd.y		= hmiddle - upperMouthcy;
	}

	pdc->Pie(rc, ptStart, ptEnd);
}


void CPacman::UpdatePosition(double& position, bool& up, double diff)
{
	ASSERT(diff >= 0.0);
	ASSERT(position >= 0.0);
	ASSERT(position <= 1.0);

	while (diff > 0.0)
	{
		if (up)
		{
			if (position + diff > 1.0)
			{
				diff= position + diff - 1.0;
				position= 1.0;
				up= false;
			}
			else
			{
				position+= diff;
				diff= 0;
			}
		}
		else
		{
			if (position - diff < 0.0)
			{
				diff= - (position - diff);
				position= 0.0;
				up= true;
			}
			else
			{
				position-= diff;
				diff= 0;
			}
		}
	}
}

COLORREF CPacman::CalculateColor()
{
	static const double pi2 = (3.1415926535897932384626433832795 / 2);

	ASSERT(m_readJobs >= 0);
	double a= atan(m_readJobs / 18) / pi2;
	ASSERT(a >= 0.0);
	ASSERT(a <= 1.0);

/*
	// a == 1 --> yellow
	// a == 0 --> green

	int red= (int)(a * 255);

	return RGB(red, 255, 0);
*/
	// a == 1 --> yellow
	// a == 0 --> bgcolor

	int red		= (int)(a * 255 + (1 - a) * GetRValue(m_bgcolor));
	int green	= (int)(a * 255 + (1 - a) * GetGValue(m_bgcolor));
	int blue	= (int)(          (1 - a) * GetBValue(m_bgcolor));

	return RGB(red, green, blue);
}

// $Log: pacman.cpp,v $
// Revision 1.6  2004/11/05 16:53:07  assarbad
// Added Date and History tag where appropriate.
//