VC++小小绘图程序

// huatuView.cpp : ChuatuView 类的实现
//

#include "stdafx.h"
#include "huatu.h"

#include "huatuDoc.h"
#include "huatuView.h"
#include ".\huatuview.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif

// ChuatuView

IMPLEMENT_DYNCREATE(ChuatuView, CView)
CPoint StartPt,EndPt;

BEGIN_MESSAGE_MAP(ChuatuView, CView)
 // 标准打印命令
 ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
 ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
 ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
 ON_WM_LBUTTONDOWN()
 ON_WM_LBUTTONUP()
 ON_WM_MOUSEMOVE()
END_MESSAGE_MAP()

// ChuatuView 构造/析构

ChuatuView::ChuatuView()
{
 // TODO: 在此处添加构造代码

}

ChuatuView::~ChuatuView()
{
}

BOOL ChuatuView::PreCreateWindow(CREATESTRUCT& cs)
{
 // TODO: 在此处通过修改 CREATESTRUCT cs 来修改窗口类或
 // 样式

 return CView::PreCreateWindow(cs);
}

// ChuatuView 绘制

void ChuatuView::OnDraw(CDC* /*pDC*/)
{
 ChuatuDoc* pDoc = GetDocument();
 ASSERT_VALID(pDoc);
 if (!pDoc)
  return;

 // TODO: 在此处为本机数据添加绘制代码
}

// ChuatuView 打印

BOOL ChuatuView::OnPreparePrinting(CPrintInfo* pInfo)
{
 // 默认准备
 return DoPreparePrinting(pInfo);
}

void ChuatuView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
 // TODO: 打印前添加额外的初始化
}

void ChuatuView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
 // TODO: 打印后添加清除过程
}

// ChuatuView 诊断

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

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

ChuatuDoc* ChuatuView::GetDocument() const // 非调试版本是内联的
{
 ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(ChuatuDoc)));
 return (ChuatuDoc*)m_pDocument;
}
#endif //_DEBUG

// ChuatuView 消息处理程序

void ChuatuView::OnLButtonDown(UINT nFlags, CPoint point)
{
 // TODO: 在此添加消息处理程序代码和/或调用默认值

 CView::OnLButtonDown(nFlags, point);
 StartPt.x=point.x;
 StartPt.y=point.y;
 
}

void ChuatuView::OnLButtonUp(UINT nFlags, CPoint point)
{
 // TODO: 在此添加消息处理程序代码和/或调用默认值

 CView::OnLButtonUp(nFlags, point);
 StartPt.x=-1;

}

void ChuatuView::OnMouseMove(UINT nFlags, CPoint point)
{
 // TODO: 在此添加消息处理程序代码和/或调用默认值

 CView::OnMouseMove(nFlags, point);
 CClientDC dc(this);
 EndPt.x=point.x;
 EndPt.y=point.y;
 if(StartPt.x>=0)
 {
  dc.MoveTo(StartPt.x,StartPt.y);
  dc.LineTo(EndPt);
  StartPt.x=EndPt.x;
  StartPt.y=EndPt.y;
 
 }

}