carraydemoview.cpp

VC++6开发指南的源代码第7章-第11章

// CArrayDemoView.cpp : implementation of the CCArrayDemoView class
//

#include "stdafx.h"
#include "CArrayDemo.h"

#include "CArrayDemoDoc.h"
#include "CArrayDemoView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CCArrayDemoView

IMPLEMENT_DYNCREATE(CCArrayDemoView, CView)

BEGIN_MESSAGE_MAP(CCArrayDemoView, CView)
	//{{AFX_MSG_MAP(CCArrayDemoView)
	ON_WM_LBUTTONDOWN()
	ON_COMMAND(ID_UNDO, OnUndo)
	ON_COMMAND(ID_CLEAR, OnClear)
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CCArrayDemoView construction/destruction

CCArrayDemoView::CCArrayDemoView()
{
	// TODO: add construction code here
	m_Array.SetSize(0,1);//初始化大小为0，增量为1
	start=true;
	pos=0;
}

CCArrayDemoView::~CCArrayDemoView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CCArrayDemoView drawing

void CCArrayDemoView::OnDraw(CDC* pDC)
{
	CCArrayDemoDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	int size = m_Array.GetUpperBound();//获取数组最后一个元素的位置
	if(size>=0)
	{
		CPoint pt;
		pt=m_Array.GetAt(0);								//获取数组的第一个元素
		CBrush mybrush(RGB(255,0,0));							//生成刷子
		CBrush *oldbrush;									//原刷子指针
		oldbrush=pDC->SelectObject(&mybrush);						//把刷子选入设备环境
		pDC->Ellipse(pt.x-3,pt.y-3,pt.x+3,pt.y+3);//绘图起点绘制一个小圆形标识
		pDC->SelectObject(oldbrush);								//恢复原有刷子	
		pDC->MoveTo(pt);
		for(int i = 1; i <= size; i++)//连线数组中的所有点
		{ 			
			pt = m_Array.GetAt(i);
			pDC->LineTo(pt);
		}
	}
}

/////////////////////////////////////////////////////////////////////////////
// CCArrayDemoView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CCArrayDemoView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CCArrayDemoView message handlers

void CCArrayDemoView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CClientDC dc(this);									//获得DC
	if(start)
	{
		CBrush mybrush(RGB(255,0,0));							//生成刷子
		CBrush *oldbrush;									//原刷子指针
		oldbrush=dc.SelectObject(&mybrush);						//把刷子选入设备环境
		dc.Ellipse(point.x-3,point.y-3,point.x+3,point.y+3);//绘图起点绘制一个小圆形标识
		dc.SelectObject(oldbrush);								//恢复原有刷子	
		m_Array.SetAtGrow(pos,point);//起始点加入数组位置0
		pos=pos+1;//数组位置增1
		start=false;
		return;
	}
	CPoint pt;
	pt=m_Array.GetAt(m_Array.GetUpperBound());//获取数组最后的元素（点）
	dc.MoveTo(pt);
	dc.LineTo(point);//连接数组最后的元素（点）和当前点
	m_Array.SetAtGrow(pos,point);//将当前点存入数组
	pos=pos+1;//数组位置增1
	CView::OnLButtonDown(nFlags, point);
}


void CCArrayDemoView::OnUndo() 
{
	// TODO: Add your command handler code here
	int size = m_Array.GetUpperBound();//获取数组大小
	if(size>=0)
	{
		CClientDC dc(this);		
		m_Array.RemoveAt(size);//去除数组的最后一个元素
		pos=pos-1;//数组当前位置减1	
		Invalidate(true);//重绘窗口
	}
	else
	{
		AfxMessageBox("图形已清空！");
		start=true;
	}	
}

void CCArrayDemoView::OnClear() 
{
	// TODO: Add your command handler code here
	int size = m_Array.GetUpperBound();//获取数组大小
	if(size>=0)
	{
		
		m_Array.RemoveAll();//清空数组
		pos=0;//数组当前位置置0
		Invalidate(true);//重绘窗口
	}
	start=true;	
}