hunter.cpp

一个同学用C++写的小游戏

// Hunter.cpp: implemention of class Hunter
#include <iostream>
#include <string>

#include <assert.h>
#include "Hunter.h"

using namespace std;

//------------------------------------------------------------------------------------------
// Constructor
//-------------------------------------------------------------------------------------------
Hunter::Hunter( SimpleWindow& Window ) : m_Window( Window ), m_Bmp ( Hunter_DirectNumber )
{
	vector<string> HunterBmpBmps( Hunter_DirectNumber );

	HunterBmpBmps[0] = "bmp\\HunterDirect-U.bmp";
	HunterBmpBmps[1] = "bmp\\HunterDirect-D.bmp";
	HunterBmpBmps[2] = "bmp\\HunterDirect-L.bmp";
	HunterBmpBmps[3] = "bmp\\HunterDirect-R.bmp";
	HunterBmpBmps[4] = "bmp\\HunterDirect-N.bmp";

	for( HunterDirection d = Hunter_Up; d < Hunter_DirectNumber; d = (HunterDirection)(d+1) )
	{
		m_Bmp[d].SetWindow( GetWindow() );
		m_Bmp[d].Load( HunterBmpBmps[d] );
		assert( m_Bmp[d].GetStatus() == BitMapOkay );
	}

	SetDirection( Hunter_None );
	SetPosition( Position(0.0, 0.0) );

	SetHorizMovement( GetBmp(GetDirection()).GetWidth() / 5.0 );
	SetVertMovement ( GetBmp(GetDirection()).GetHeight() / 5.0 );
}

//-----------------------------------------------------------------------------
SimpleWindow& Hunter::GetWindow() const
{
	return m_Window;
} 

//------------------------------------------------------------------------------
// get bitmaps
//------------------------------------------------------------------------------
const BitMap& Hunter::GetBmp( const HunterDirection& D ) const
{
	return m_Bmp[D];
}
BitMap& Hunter::GetBmp( const HunterDirection& D )
{
	return m_Bmp[D];
}

//-------------------------------------------------------------------------------
// get and set position
//-------------------------------------------------------------------------------
Position Hunter::GetPosition() const
{
	return m_HunterPosition;
}
void Hunter::SetPosition( const Position& p )
{
	for( HunterDirection d = Hunter_Up; d < Hunter_DirectNumber; d = (HunterDirection)(d+1) )
	{
		m_Bmp[d].SetPosition( p );
	}

	m_HunterPosition = p;
	return;
}

//--------------------------------------------------------------------------
// get and set direction
//--------------------------------------------------------------------------
HunterDirection Hunter::GetDirection() const
{
	return m_HunterDirection;
}

void Hunter::SetDirection( const HunterDirection &d)
{
	m_HunterDirection = d;
	return;
}

//-----------------------------------------------------------------------------
// get and vertical movement
//-----------------------------------------------------------------------------
float Hunter::GetVertMovement() const
{
	return m_VertMovement;
}
void Hunter::SetVertMovement( float v )
{
	m_VertMovement = v;
	return;
}
//------------------------------------------------------------------------------
// get and horizontal movement
//------------------------------------------------------------------------------
float Hunter::GetHorizMovement() const
{
	return m_HorizMovement;
}
void Hunter::SetHorizMovement( float h )
{
	m_HorizMovement = h;
	return;
}


//----------------------------------------------------------------------------------
// Draw and Erase
//------------------------------------------------------------------------------------
void Hunter::Draw()
{
	GetBmp( GetDirection() ).Draw();

	return;
}

void Hunter::Erase()
{
	GetBmp( GetDirection() ).Erase();

	return;
}

//-----------------------------------------------------------------------------------------
// judge whether the pet is at the Edge 
//-----------------------------------------------------------------------------------------
bool Hunter::AtUpEdge() const
{
	const float fHunterYPosn = GetPosition().GetYDistance();
	return fHunterYPosn - GetVertMovement() <= 0.0;
}

bool Hunter::AtDownEdge() const
{
	const float fHunterYPosn = GetPosition().GetYDistance();

	const float fHunterYSize = GetBmp( GetDirection() ).GetHeight();
	const float fWndYSize = GetWindow().GetHeight();

	return fHunterYPosn + fHunterYSize + GetVertMovement() >= fWndYSize;
}

bool Hunter::AtLeftEdge() const
{
	const float fHunterXPosn = GetPosition().GetXDistance();

	return fHunterXPosn - GetHorizMovement() <= 0.0;
}

bool Hunter::AtRightEdge() const
{
	const float fHunterXPosn = GetPosition().GetXDistance();

	const float fHunterXSize = GetBmp( GetDirection() ).GetWidth();
	const float fWndXSize = GetWindow().GetWidth();

	return fHunterXPosn + fHunterXSize + GetHorizMovement() >= fWndXSize;
}

//--------------------------------------------------------------------------------------
// set a new position for pet to move to
//--------------------------------------------------------------------------------------
Position Hunter::NewPosition() const
{
	const HunterDirection d = GetDirection();
	const Position     p = GetPosition() ;

	switch ( d )
	{
	case Hunter_Up:
		return p + Position( 0.0, -GetVertMovement() );
		break;

	case Hunter_Down:
		return p + Position( 0.0,  GetVertMovement() );
		break;

	case Hunter_Left:
		return p + Position( -GetHorizMovement(), 0.0 );
		break;

	case Hunter_Right:
		return p + Position(  GetHorizMovement(), 0.0  );
		break;

	case Hunter_None:
		return p;        // Do nothing
		break;
	}
}

//----------------------------------------------------------------------
void Hunter::Create()
{
	Draw();
}

//---------------------------------------------------------------------
// move the pet
//---------------------------------------------------------------------
void Hunter::Move()
{
	Erase();


	const HunterDirection d = GetDirection();
	
	if (   ( d == Hunter_Up    && AtUpEdge()    ) 
        || ( d == Hunter_Down  && AtDownEdge()  )
		|| ( d == Hunter_Left  && AtLeftEdge()  )
		|| ( d == Hunter_Right && AtRightEdge() ) )
	{
		SetDirection( Hunter_None );
	}

	SetPosition( NewPosition() );

	Draw();

	return;
}