exp32_2view.cpp

mfc例题与练习第二版 例题与练习第二版

// Exp32_2View.cpp : implementation of the CExp32_2View class
//

#include "stdafx.h"
#include "Exp32_2.h"

#include "Exp32_2Doc.h"
#include "Exp32_2View.h"
#include "GraphDlg.h"

#include "line.h"
#include "circle.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CExp32_2View

IMPLEMENT_DYNCREATE(CExp32_2View, CView)

BEGIN_MESSAGE_MAP(CExp32_2View, CView)
	//{{AFX_MSG_MAP(CExp32_2View)
	ON_COMMAND(ID_GRAPH, OnGraph)
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CExp32_2View construction/destruction

CExp32_2View::CExp32_2View()
{
	// TODO: add construction code here

}

CExp32_2View::~CExp32_2View()
{
}

BOOL CExp32_2View::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CExp32_2View drawing

void CExp32_2View::OnDraw(CDC* pDC)
{
	CExp32_2Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	pDC->SelectStockObject(NULL_BRUSH);	//选择空画刷，使图形透明
	POSITION pos;
	CElement *elem;
	pos = m_pViewList->GetHeadPosition();
	while(pos!=NULL){  						//画出链表中所有图形
		elem = (CElement*)m_pViewList->GetAt(pos);
		elem->Draw(pDC);
		m_pViewList->GetNext(pos);
	}

}

/////////////////////////////////////////////////////////////////////////////
// CExp32_2View printing

BOOL CExp32_2View::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CExp32_2View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CExp32_2View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CExp32_2View diagnostics

#ifdef _DEBUG
void CExp32_2View::AssertValid() const
{
	CView::AssertValid();
}

void CExp32_2View::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CExp32_2Doc* CExp32_2View::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CExp32_2Doc)));
	return (CExp32_2Doc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CExp32_2View message handlers

void CExp32_2View::OnGraph() 
{
	// TODO: Add your command handler code here
	CGraphDlg dlg;
	if((dlg.DoModal())==IDOK){
   	    m_color = RGB(dlg.m_intRed,dlg.m_intGreen,dlg.m_intBlue);
		m_type = dlg.m_intType ; 						//设置类型
	    if(m_type ==0){             					//构造直线
		  CLine *pLine = new CLine(dlg.m_intX1,dlg.m_intY1,
			  dlg.m_intX2,dlg.m_intY2);
		  pLine->SetColor(m_color);  					//设置颜色
		  m_position = m_pViewList->AddTail(pLine);   	//添加至链表
		}
	  	else {  										//构造圆
		  CCircle *pCircle = new CCircle(dlg.m_intX1,dlg.m_intY1,
			  dlg.m_intX2);
		  pCircle->SetColor(m_color);  				//设置颜色
		  m_position = m_pViewList->AddTail(pCircle);   	//添加至链表
		}
	}
	Invalidate();             				//使视图重画，调用OnDraw函数

}

void CExp32_2View::OnInitialUpdate() 
{
	CView::OnInitialUpdate();
	
	// TODO: Add your specialized code here and/or call the base class
	CExp32_2Doc* pDoc = GetDocument();
		ASSERT_VALID(pDoc);
		m_pViewList = &(	pDoc->m_elemList);
		m_position = m_pViewList->GetHeadPosition();

}