line.cpp

通过可执行文件中的菜单“绘图”

#include "stdafx.h"
#include "math.h"
#include "VCad.h"
#include "VCadDoc.h"
#include "VCadView.h"
#include "Entity.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
//定义 CLine 类
IMPLEMENT_SERIAL(CLine, CEntity, 0)

CLine::CLine()
{
	Init();
}

CLine::CLine(const CLine& line)
		: CEntity(line)
{
	m_begin = line.m_begin;
	m_end	 = line.m_end;
}

CLine::CLine(const Position& begin,const Position& end)
{
	Init();
	m_begin = begin ;
	m_end = end ;
}

CLine::~CLine()
{
}

CLine& CLine::operator = (const CLine& line)
{
	// 处理特殊情况：line1 = line1
	if(this == &line)
		return *this;
	// 一般情形：line2 = line1
	// 调用基类的重载“=”操作
	CEntity::operator = (line); 
	m_begin = line.m_begin;
	m_end = line.m_end;
	return *this;
}

CEntity* CLine::Copy()
{
	CLine*	pEntity = new CLine(m_begin, m_end);
	return pEntity;
}

void CLine::Init()
{
	CEntity::Init();
	m_type = etLine;
	m_begin.Init();
	m_end.Init();
}

int	CLine::GetType()
{
	return etLine;
}

Position CLine::GetBeginPos()
{
	return m_begin;
}

Position CLine::GetEndPos()
{
	return m_end;
}

void CLine::Draw(CDC * pDC, int drawMode /* = dmNormal */)
{
	CPoint pt_begin, pt_end; // 屏幕坐标的起点和终点
	// 将世界坐标转化为屏幕坐标
	g_pView->WorldtoScreen(m_begin,pt_begin); 
	g_pView->WorldtoScreen(m_end,pt_end) ;
	// 得到原来的绘图模式
	int		n = GetROP2(pDC->GetSafeHdc()); 
	// 创建画笔的原则：
	// 如果在正常的绘图模式下，使用成员变量创建画笔
	// 如果是其它的模式,使用全局函数"SetDrawEnvir"创建画笔
	CPen	pen; 
	if( drawMode == dmNormal )  
		pen.CreatePen(m_lineStyle,m_lineWidth,m_color) ;
	else 
		::SetDrawEnvir(pDC, drawMode, &pen);
	// 得到原来的画笔
	CPen* pOldPen = pDC->SelectObject(&pen); 
	pDC->SetMapMode(MM_LOENGLISH); 
	// 根据屏幕坐标绘制图元
	pDC->MoveTo(pt_begin); 
	pDC->LineTo(pt_end);
	// 恢复原来的画笔 
	pDC->SelectObject(pOldPen); 
	// 恢复原来的绘图模式
	pDC->SetROP2(n); 
}

void CLine::Serialize(CArchive& ar) 
{
	CEntity::Serialize(ar);
	m_begin.Serialize(ar);
	m_end.Serialize(ar);
}