skf_mapview.cpp

这是书上的代码

// Skf_MapView.cpp : implementation of the CSkf_MapView class
//

#include "stdafx.h"
#include "Skf_Map.h"

#include "Skf_MapDoc.h"
#include "Skf_MapView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CSkf_MapView

IMPLEMENT_DYNCREATE(CSkf_MapView, CView)

BEGIN_MESSAGE_MAP(CSkf_MapView, CView)
	//{{AFX_MSG_MAP(CSkf_MapView)
	ON_WM_LBUTTONDOWN()
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONUP()
	ON_COMMAND(IDM_BKCOLOR, OnBkcolor)
	ON_WM_ERASEBKGND()
	//}}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)

	//以下两行为手工添加
	ON_COMMAND_RANGE(ID_MAP,ID_MYPHOTO, OnShowLayer)
	ON_UPDATE_COMMAND_UI_RANGE(ID_MAP,ID_MYPHOTO,OnUpdateLayerButtonFace)

END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CSkf_MapView construction/destruction

CSkf_MapView::CSkf_MapView()
{
	OrgX=0;	OrgY=0;  //地图圆心坐标在客户区左上角
	m_BitLayer=0x001f;//各图层初始为全显示，集对应位为1
	b_MapMove=FALSE;
	BKColor=RGB(0,0,0);//地图背景初始色
	pTxt.Format("%s", 
"     本程序旨在与大家探讨如何在\n\
VisualC++下实现：\n\
1.无闪烁地图、图形、位图的绘制，\n\
2.鼠标抓拖地图背景的程序实现原理，\n\
3.地图分层的实现，\n\
4.视图打印的实现，\n\
5.几个好用的MFC类的使用方法，\n\
等一些本人工作中总结的一点经验，\n\
希望能与大家共享其中的乐趣，同\n\
时也欢迎大家提出宝贵的批评意见。\n\
如想与我联系，告诉你我的E-mail: \n\
[e-mail]\n\n\
注：本程序所用地图数据只是为了\n\
就说明程序实现方法而取的逻辑坐标\n\
点，并非通过实际测量所得数据，也\n\
没有任何地理意义，读者如果需要绘\n\
出实际有用的地图，则需要通过专用\n\
设备获取准确测量的数据并经过相应\n\
的坐标转换处理（这是一个较复杂的\n\
过程），然后使用转换后的数据进行\n\
程序作图。如果您执意要使用作者程\n\
序中使用的地图文件作图，由此引起\n\
的一切不良后果本人概不负责");
}

CSkf_MapView::~CSkf_MapView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CSkf_MapView drawing

void CSkf_MapView::OnDraw(CDC* pDC)
{
	CSkf_MapDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	GetClientRect(&rect);      //获取当前客户区域的大小
//在内存中开辟一块与当前DC相同的DC然后在其上作图
	CDC mDC;
	mDC.CreateCompatibleDC(pDC);
	CBitmap MemBitmap;
	MemBitmap.CreateCompatibleBitmap(pDC,rect.right ,rect.bottom );
	CBitmap *pOldBitmap=mDC.SelectObject(&MemBitmap);
//改变背景颜色
	CBrush Brush_Bak(BKColor);  
	CBrush *pOldBrush=mDC.SelectObject(&Brush_Bak);
   	mDC.SelectObject(Brush_Bak);
    mDC.FillRect(&rect,&Brush_Bak); 
    mDC.SelectObject(pOldBrush);
//在以下绘图函数调用中，语句的先后决定了图层的先后，即先绘的在最下层。
	for (int i=0;i<3;i++)
		SKFDrawMap(&mDC,i);
    SKFDrawBitmap(&mDC,rect.right-190,rect.bottom-528,IDB_BMPME);	
	SKFDrawText(&mDC);
	SKFDrawYellowriver(&mDC);
	SKFDrawChinese(&mDC);
//将内存DC上所绘内容一次性拷贝到当前DC
	pDC->BitBlt(0,0,rect.right ,rect.bottom ,&mDC,0,0,SRCCOPY);
	
}

/////////////////////////////////////////////////////////////////////////////
// CSkf_MapView printing

BOOL CSkf_MapView::OnPreparePrinting(CPrintInfo* pInfo)
{
	pInfo->SetMaxPage(2);   
	BOOL bRet = DoPreparePrinting(pInfo);   
	pInfo->m_nNumPreviewPages = 2; 
	return bRet;
}

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

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

/////////////////////////////////////////////////////////////////////////////
// CSkf_MapView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CSkf_MapView message handlers

void CSkf_MapView::SKFDrawMap(CDC *pDC,int layer)
{
	if(!(m_BitLayer&0x0001)) return;
	CSkf_MapDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	CPen cpen;
	CPen *oldpen;
	COLORREF COLOR;
	if(layer==3)//黄河
		COLOR=RGB(0,0,255);
	else        //国界
		COLOR=RGB(255,128,64);
	cpen.CreatePen(PS_SOLID,2,COLOR); 
	oldpen=pDC->SelectObject(&cpen);
	pDC->MoveTo(pDoc->pMapDataAry[layer][0].x-OrgX,pDoc->pMapDataAry[layer][0].y+OrgY);
	for(int i=1;i<pDoc->pMapDataAry[layer].GetSize();i++)
		pDC->LineTo(pDoc->pMapDataAry[layer][i].x-OrgX,pDoc->pMapDataAry[layer][i].y+OrgY);
	pDC->SelectObject(oldpen);

}

void CSkf_MapView::SKFDrawText(CDC *pDC)
{
	if(!(m_BitLayer&0x0002)) return;
//初始化字体
	LOGFONT logFont;
	memset(&logFont, 0, sizeof(LOGFONT));
	logFont.lfHeight =16;  
	logFont.lfWidth  =7;
	strcpy(logFont.lfFaceName,"新宋体");
	CFont font;
	CFont* pOldFont = NULL;
	if (font.CreateFontIndirect(&logFont))
		pOldFont = pDC->SelectObject(&font);

	TEXTMETRIC tm;
	pDC->SetBkMode(TRANSPARENT);//设置字体背景为透明
	pDC->GetTextMetrics(&tm);  //取得字符的属性宽和高
	CRect rect;
	GetClientRect(&rect);
	pDC->SetTextColor(RGB(128,255,128));
	pDC->Draw3dRect(CRect(rect.right -tm.tmAveCharWidth*36-10,rect.bottom -(tm.tmHeight+tm.tmExternalLeading)*30,rect.right-15,rect.bottom-25),
		RGB(255,255,255),RGB(100,100,100));//画一个3D矩形框
	pDC->DrawText(pTxt,CRect(rect.right -tm.tmAveCharWidth*36,rect.bottom -(tm.tmHeight+tm.tmExternalLeading)*24,rect.right,rect.bottom),DT_EXPANDTABS);
	
	logFont.lfHeight = 44;
	logFont.lfWidth = 22;
	CFont font1;
	if (font1.CreateFontIndirect(&logFont))
		pOldFont = pDC->SelectObject(&font1);
    COLORREF oldcol=pDC->SetTextColor(RGB(255,64,64));
	pDC->DrawText("说\n明",CRect(rect.right-240,rect.bottom-520,rect.right,rect.bottom),DT_EXPANDTABS);
	pDC->SelectObject(pOldFont);
	pDC->SetTextColor(oldcol);
}
void CSkf_MapView::SKFDrawChinese(CDC *pDC)
{
	if(!(m_BitLayer&0x0004)) return;
	LOGFONT logFont;
	memset(&logFont, 0, sizeof(LOGFONT));
	logFont.lfHeight =44;  
	logFont.lfWidth  =22;
	strcpy(logFont.lfFaceName,"新宋体");
	CFont font;
	CFont* pOldFont = NULL;
	if (font.CreateFontIndirect(&logFont))
		pOldFont = pDC->SelectObject(&font);
	TEXTMETRIC tm;
	pDC->GetTextMetrics(&tm);  //取得字符的属性宽和高
	CString strText;
	strText.Format ("中  华  人  民  共  和  国");
	COLORREF oldcol=pDC->SetTextColor(RGB(255,0,0));
	pDC->SetBkMode(TRANSPARENT);
	pDC->TextOut (554-OrgX,523+OrgY,strText);
	pDC->SelectObject(pOldFont);
	pDC->SetTextColor(oldcol);
}
void CSkf_MapView::SKFDrawYellowriver(CDC *pDC)
{
	if(!(m_BitLayer&0x0008)) return;
	SKFDrawMap(pDC,3);
}

void CSkf_MapView::SKFDrawBitmap(CDC *pDC,int left,int top,UINT ID_BMP)
{
	if(!(m_BitLayer&0x0010)) return;
	CDC m_SrcDC;
	BITMAP bminfo;
	CBitmap* pbmface=new CBitmap();
	pbmface->LoadBitmap(ID_BMP);
	pbmface->GetObject(sizeof(BITMAP),&bminfo);
	m_SrcDC.CreateCompatibleDC(pDC);
	CBitmap* pOldBitmap=m_SrcDC.SelectObject(pbmface);
	pDC->BitBlt(left/*-OrgX*/,top/*+OrgY*/,bminfo.bmWidth,bminfo.bmHeight,&m_SrcDC,0,0,SRCCOPY);  
	m_SrcDC.SelectObject(pOldBitmap);
	pbmface->DeleteObject(); 
	delete pbmface;
}


void CSkf_MapView::OnInitialUpdate() 
{
	CView::OnInitialUpdate();
}

void CSkf_MapView::OnShowLayer(UINT nID)//手工添加
{
	m_BitLayer&(1<<(nID-ID_MAP))? m_BitLayer^=(1<<(nID-ID_MAP)):m_BitLayer|=(1<<(nID-ID_MAP));
	Invalidate();
}
void CSkf_MapView::OnUpdateLayerButtonFace(CCmdUI* pCmdUI)//手工添加
{
	m_BitLayer&(1<<(pCmdUI->m_nID-ID_MAP))?pCmdUI->SetCheck(1):pCmdUI->SetCheck (0);

}


void CSkf_MapView::OnLButtonDown(UINT nFlags, CPoint point) 
{
//让鼠标始终被当前View控制 
	SetCapture();   
//将鼠标光标设置为手形
	SetCursor(AfxGetApp()->LoadCursor(IDC_CURMOVE));	
	MouseDownPoint=point;
	b_MapMove=TRUE;
	CView::OnLButtonDown(nFlags, point);
}

void CSkf_MapView::OnMouseMove(UINT nFlags, CPoint point) 
{
	if(!b_MapMove) return;
	OrgX+=((MouseDownPoint.x-point.x));
	OrgY-=((MouseDownPoint.y-point.y));
	MouseDownPoint=point;
	Invalidate();
	CView::OnMouseMove(nFlags, point);
}


void CSkf_MapView::OnLButtonUp(UINT nFlags, CPoint point) 
{
//释放鼠标，交系统控制 
	ReleaseCapture();
	b_MapMove=FALSE;
	CView::OnLButtonUp(nFlags, point);
}

void CSkf_MapView::OnBkcolor() 
{
//在构造函数中用当前背景色初始化颜色对话框
//这样使得每次打开颜色对话框是都保留上一次的颜色设置
	CColorDialog codlg( BKColor, CC_FULLOPEN, NULL );
	if(codlg.DoModal()==IDOK)
	{
		BKColor=codlg.GetColor();
		Invalidate(TRUE);
	}
	
}

void CSkf_MapView::OnPrint(CDC* pDC, CPrintInfo* pInfo) 
{
    CRect rct;
	GetClientRect(rct);
	pDC->SetMapMode(MM_ANISOTROPIC);
    CDC* pViewDC = GetDC();
	int	numx=pViewDC->GetDeviceCaps(LOGPIXELSX);
	int numy=pViewDC->GetDeviceCaps(LOGPIXELSY);

	int w=pInfo->m_rectDraw.Width();
	int h=pInfo->m_rectDraw.Height();

	//转换坐标映射方式
	CSize size = CSize(GetSystemMetrics(SM_CXSCREEN), GetSystemMetrics(SM_CYSCREEN));
	pDC->SetWindowExt(size); 
	//确定窗口大小
	//得到实际设备每逻辑英寸的像素数量
	int xLogPixPerInch = pDC->GetDeviceCaps(LOGPIXELSX); 
	int yLogPixPerInch = pDC->GetDeviceCaps(LOGPIXELSY);
	//得到设备坐标和逻辑坐标的比例

	long xExt;
	long yExt;
	xExt=(long)(size.cx*xLogPixPerInch/numx) ;
	yExt=(long)(size.cy*yLogPixPerInch/numy) ;
	pDC->SetViewportExt((int)xExt, (int)yExt);
	OnDraw(pDC);
}

BOOL CSkf_MapView::OnEraseBkgnd(CDC* pDC) 
{
    return TRUE;  //让该消息不要使用缺省功能去擦除现有视图背景	
	// 	return CView::OnEraseBkgnd(pDC);
}