testmousecursorrgnview.cpp

VisualC高级编程技术精粹.rar

// TestMouseCursorRgnView.cpp : implementation of the CTestMouseCursorRgnView class
//

#include "stdafx.h"
#include "TestMouseCursorRgn.h"

#include "TestMouseCursorRgnDoc.h"
#include "TestMouseCursorRgnView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CTestMouseCursorRgnView

IMPLEMENT_DYNCREATE(CTestMouseCursorRgnView, CView)

BEGIN_MESSAGE_MAP(CTestMouseCursorRgnView, CView)
	//{{AFX_MSG_MAP(CTestMouseCursorRgnView)
	ON_WM_LBUTTONDOWN()
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CTestMouseCursorRgnView construction/destruction

CTestMouseCursorRgnView::CTestMouseCursorRgnView()
{
	// TODO: add construction code here
	m_nLocation = -1;
}

CTestMouseCursorRgnView::~CTestMouseCursorRgnView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CTestMouseCursorRgnView drawing

void CTestMouseCursorRgnView::OnDraw(CDC* pDC)
{
	CTestMouseCursorRgnDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here

	pDC->SetBkColor(RGB(0,0,0)); // 设置背景色
	pDC->SetTextColor(RGB(0,255,0)); // 设置前景色

	// 在客户区显示信息
	pDC->TextOut(350, 
		         10, 
		         _T("本程序的功能:按下鼠标的左键，测试鼠标光标所在的Rgn"));

	// 定义一个CRect对象
	CRect myRect(100,100,300,300); 

	// 将myRect的值赋给成员变量m_Rect
	m_Rect.CopyRect(&myRect);

	// 使用画笔绘制矩形
	CPen pen;
	pen.CreatePen(PS_SOLID, 1, RGB(255,0,0));
	CPen* pOldPen = pDC->SelectObject(&pen);
	pDC->Rectangle(m_Rect);

	// 使用画刷绘制椭圆形
	CBrush brush;
	brush.CreateSolidBrush(RGB(0,255,0));
	CBrush*	pOldBrush = pDC->SelectObject(&brush);
	pDC->Ellipse(m_Rect);

	// 获得当前客户区的矩形区域
	CRect rc;
	GetClientRect(&rc);
	
	int centerX = (rc.left + rc.right)/2;
	int centerY = (rc.top + rc.bottom)/2;

	switch (m_nLocation)
	{
	case 0:
		pDC->SetBkColor(RGB(0,0,0));
		pDC->SetTextColor(RGB(255,255,0));
		pDC->TextOut(centerX, centerY, _T("在矩形区域, 但不在椭圆形区域"));
		break;
	case 1:
		pDC->SetBkColor(RGB(0,255,0));
		pDC->SetTextColor(RGB(0,0,255));
		pDC->TextOut(centerX, centerY, _T("既在椭圆形区域，也在矩形区域"));
		break;
	case 2:
		pDC->SetBkColor(RGB(0,255,255));
		pDC->SetTextColor(RGB(255,0,0));
		pDC->TextOut(centerX, centerY, _T("既不在椭圆形区域，也不在矩形区域"));
		break;
	default:
		break;
	}
}

/////////////////////////////////////////////////////////////////////////////
// CTestMouseCursorRgnView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CTestMouseCursorRgnView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CTestMouseCursorRgnView message handlers

void CTestMouseCursorRgnView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default

	// 定义一个CRect对象
	CRect myRect(100,100,300,300); 
	
	CDC* pDC = GetDC();
	pDC->DPtoLP(&point);
	pDC->DPtoLP(&myRect);

	// 使用CreateRectRgn函数初始化一个矩形区域对象
	m_RectRgn.CreateRectRgn(myRect.left,
		                    myRect.top,
							myRect.right,
							myRect.bottom);

	// 使用CreateEllipticRgnIndirect函数初始化一个椭圆形区域对象
	m_EllipRgn.CreateEllipticRgnIndirect(&myRect);
	
	if (m_RectRgn.PtInRegion(point)&&!m_EllipRgn.PtInRegion(point))
	{
		// 0: 表示在矩形区域中，而不在椭圆形区域中
		m_nLocation = 0;
		Invalidate();
	}
	else if (m_EllipRgn.PtInRegion(point)) 
	{
		// 1: 表示既在矩形区域中，又在椭圆形区域中
		m_nLocation = 1;
		Invalidate();
	}
	else
	{
		// 2: 表示即不在矩形区域中，又不在椭圆形区域中
		m_nLocation = 2;
		Invalidate();
	}

	// 释放内存
	m_EllipRgn.DeleteObject();
	m_RectRgn.DeleteObject();
	
	CView::OnLButtonDown(nFlags, point);
}