drawdemoview.cpp

一个关于画图的小程序

// DrawDemoView.cpp : CDrawDemoView 类的实现
//

#include "stdafx.h"
#include "DrawDemo.h"

#include "DrawDemoDoc.h"
#include "DrawDemoView.h"
#include ".\drawdemoview.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CDrawDemoView

IMPLEMENT_DYNCREATE(CDrawDemoView, CView)

BEGIN_MESSAGE_MAP(CDrawDemoView, 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_RBUTTONDOWN()
END_MESSAGE_MAP()

// CDrawDemoView 构造/析构

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

}

CDrawDemoView::~CDrawDemoView()
{
}

BOOL CDrawDemoView::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);
}

// CDrawDemoView 绘制

void CDrawDemoView::OnDraw(CDC* pDC)
{
	CDrawDemoDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	if (!pDoc)
		return;

	// TODO: 在此处为本机数据添加绘制代码
	pDoc->Draw(pDC);

}


// CDrawDemoView 打印

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

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

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


// CDrawDemoView 诊断

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

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

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


// CDrawDemoView 消息处理程序

void CDrawDemoView::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
    start=point;
	CView::OnLButtonDown(nFlags, point);
}

void CDrawDemoView::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
    end=point;
	CDC*pDC=GetDC();
	pDC->MoveTo(start);
    pDC->LineTo(end);
	  ReleaseDC(pDC);
	  CDrawDemoDoc *pDoc=GetDocument();
	  pDoc->AddLine(start,end);
	  pDoc->SetModifiedFlag();
	CView::OnLButtonUp(nFlags, point);
}

void CDrawDemoView::OnRButtonDown(UINT nFlags, CPoint point)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
    CDrawDemoDoc *pDoc=GetDocument();
	pDoc->DeleteContents();
	Invalidate();
	CView::OnRButtonDown(nFlags, point);
}