structure.cpp

此程序实现类似于windows画图工具的源代码。有铅笔

#include "stdafx.h"
#include "structure.h"

Stack::Stack(int len)
{
	if( len > MAXLEN )
		len = MAXLEN;
	m_iMaxLen = len;
	m_iTotalLen = 0;
	m_iCurPos = -1;
}

Stack::~Stack()
{
}

void Stack::Add(HBITMAP element)
{
	m_iTotalLen = m_iCurPos+1;//新加一个动作时　就不允许Redo了
	if( m_iTotalLen < m_iMaxLen)
	{
		Stock[++m_iCurPos] = element;
		m_iTotalLen++;
	}
	else
	{
		for( int i = 0; i < m_iMaxLen - 1; i++ )
			Stock[i] = Stock[i+1];
		Stock[m_iMaxLen - 1] = element;
	}
}

bool Stack::IsEmpty()
{
	return(m_iTotalLen == 0);
}

HBITMAP  Stack::Undo()
{
	ASSERT(m_iCurPos > 0);
	return  Stock[--m_iCurPos];
}

HBITMAP  Stack::Redo()
{
	ASSERT(m_iCurPos+1 < m_iTotalLen);
	return  Stock[++m_iCurPos];
}

bool Stack::CanUndo()
{
	return( m_iCurPos > 0 );
}

bool Stack::CanRedo()
{
	return( m_iCurPos+1 < m_iTotalLen );
}

HBITMAP  Stack::GetCurrent()
{
	if (m_iCurPos>=0)
		return  Stock[m_iCurPos];
	else
		return NULL;
}

int Stack::GetLen()
{
	return m_iTotalLen;
}

int Stack::GetPos()
{
	return m_iCurPos;
}

void Stack::Clear()
{
	m_iTotalLen = 0;
	m_iCurPos = -1;
}