C语言程序设计（郑莉）课后习题答案

内容发布更新时间 : 2024/5/17 8:15:54星期一 下面是文章的全部内容请认真阅读。

case 3:

brushNew.CreateSolidBrush(RGB(0, 255, 0)); break; case 4:

brushNew.CreateSolidBrush(RGB(0, 0, 255)); break; case 5:

brushNew.CreateSolidBrush(RGB(127, 127, 0)); break; case 6:

brushNew.CreateSolidBrush(RGB(127, 0, 127)); break; case 7:

brushNew.CreateSolidBrush(RGB(0, 127, 127)); break; }

penNew.CreatePen(PS_SOLID, 1, RGB(0, 0, 0)); ppenOld = pDC->SelectObject(&penNew); pbrushOld = pDC->SelectObject(&brushNew); pDC->Polygon(m_pointList, m_nPointCount); pDC->SelectObject(ppenOld); pDC->SelectObject(pbrushOld); }

// 检测一点是否在拼图块中

BOOL CChip::PtInChip(POINT point) {

CRgn rgn;

rgn.CreatePolygonRgn(m_pointList, m_nPointCount, 0); return rgn.PtInRegion(point); }

// 取拼图块的包含矩形 LPCRECT CChip::GetRect() {

static RECT rect; CRgn rgn;

rgn.CreatePolygonRgn(m_pointList, m_nPointCount, 0); rgn.GetRgnBox(&rect); rect.right++; rect.bottom++; return ▭ }

// 旋转拼图块

void CChip::Rotation() {

CRect rect; CRgn rgn;

rgn.CreatePolygonRgn(m_pointList, m_nPointCount, 0); rgn.GetRgnBox(&rect);

double x = rect.left+rect.Width()/2; // 计算旋转中心 double y = rect.top+rect.Height()/2; double dx, dy;

for(int i=0; i

dx = m_pointList[i].x-x; dy = m_pointList[i].y-y;

m_pointList[i].x = (int)(x+dx*0.7071-dy*0.7071); m_pointList[i].y = (int)(y+dx*0.7071+dy*0.7071); } }

// 移动拼图块

void CChip::MoveTo(CSize offset) {

for(int i=0; i

// 序列化

void CChip::Serialize(CArchive &ar) {

if(ar.IsStoring()) {

ar << m_nType; ar << m_nPointCount;

for(int i=0; i

ar >> m_nType; ar >> m_nPointCount;

for(int i=0; i> m_pointList[i]; } } //

文

档

类

//////////////////////////////////////////////////// #define CHIP_COUNT 7

class CMyDoc : public CDocument {

DECLARE_DYNCREATE(CMyDoc) CChip m_chipList[CHIP_COUNT]; public: void Reset();

virtual void DeleteContents(); virtual void Serialize(CArchive& ar); };

IMPLEMENT_DYNCREATE(CMyDoc, CDocument)

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// 初始化拼图块 void CMyDoc::Reset() {

POINT pointList[MAX_POINTS]; pointList[0].x = DELTA; pointList[0].y = DELTA;

pointList[1].x = DELTA+CHIP_WIDTH; pointList[1].y = DELTA;

pointList[2].x = DELTA+CHIP_WIDTH/2; pointList[2].y = DELTA+CHIP_WIDTH/2; m_chipList[0].SetChip(1, pointList, 3);

pointList[0].x = DELTA; pointList[0].y = DELTA; pointList[1].x = DELTA;

pointList[1].y = DELTA+CHIP_WIDTH; pointList[2].x = DELTA+CHIP_WIDTH/2; pointList[2].y = DELTA+CHIP_WIDTH/2; m_chipList[1].SetChip(2, pointList, 3);

pointList[0].x = DELTA+CHIP_WIDTH; pointList[0].y = DELTA;

pointList[1].x = DELTA+CHIP_WIDTH; pointList[1].y = DELTA+CHIP_WIDTH/2; pointList[2].x = DELTA+(CHIP_WIDTH*3)/4; pointList[2].y = DELTA+CHIP_WIDTH/4; m_chipList[2].SetChip(3, pointList, 3);

pointList[0].x = DELTA+CHIP_WIDTH/2; pointList[0].y = DELTA+CHIP_WIDTH/2; pointList[1].x = DELTA+CHIP_WIDTH/4; pointList[1].y = DELTA+(CHIP_WIDTH*3)/4; pointList[2].x = DELTA+(CHIP_WIDTH*3)/4; pointList[2].y = DELTA+(CHIP_WIDTH*3)/4; m_chipList[3].SetChip(4, pointList, 3);

pointList[0].x = DELTA+CHIP_WIDTH; pointList[0].y = DELTA+CHIP_WIDTH/2; pointList[1].x = DELTA+CHIP_WIDTH; pointList[1].y = DELTA+CHIP_WIDTH; pointList[2].x = DELTA+CHIP_WIDTH/2; pointList[2].y = DELTA+CHIP_WIDTH; m_chipList[4].SetChip(5, pointList, 3);

pointList[0].x = DELTA+(CHIP_WIDTH*3)/4; pointList[0].y = DELTA+CHIP_WIDTH/4; pointList[1].x = DELTA+CHIP_WIDTH/2; pointList[1].y = DELTA+CHIP_WIDTH/2;

pointList[2].x = DELTA+(CHIP_WIDTH*3)/4; pointList[2].y = DELTA+(CHIP_WIDTH*3)/4; pointList[3].x = DELTA+CHIP_WIDTH; pointList[3].y = DELTA+CHIP_WIDTH/2; m_chipList[5].SetChip(6, pointList, 4);

pointList[0].x = DELTA;

pointList[0].y = DELTA+CHIP_WIDTH; pointList[1].x = DELTA+CHIP_WIDTH/4; pointList[1].y = DELTA+(CHIP_WIDTH*3)/4; pointList[2].x = DELTA+(CHIP_WIDTH*3)/4; pointList[2].y = DELTA+(CHIP_WIDTH*3)/4;

pointLis ¨t[3].x = DELTA+CHIP_WIDTH/2; pointList[3].y = DELTA+CHIP_WIDTH; m_chipList[6].SetChip(7, pointList, 4); // 清理文档：关闭文档、建立新文档和打开文档前调用 void CMyDoc::DeleteContents() { Reset();

CDocument::DeleteContents(); }

// 系列化：读写文档时自动调用 void CMyDoc::Serialize(CArchive &ar) {

for(int i=0; i

视

图

类

/////////////////////////////////////////////////// class CMyView : public CView {

DECLARE_DYNCREATE(CMyView) BOOL m_bCaptured; CPoint m_pointMouse; int m_nCurrIndex; public:

CMyView(){m_bCaptured = FALSE;}

CMyDoc* GetDocument(){return (CMyDoc*)m_pDocument;} virtual void OnInitialUpdate();

virtual BOOL OnPreparePrinting(CPrintInfo* pInfo); virtual void OnDraw(CDC* pDC);

afx_msg void OnLButtonDown(UINT nFlags, CPoint point); afx_msg void OnLButtonUp(UINT nFlags, CPoint point); afx_msg void OnMouseMove(UINT nFlags, CPoint point); afx_msg void OnRButtonDown(UINT nFlags, CPoint point); DECLARE_MESSAGE_MAP() };

IMPLEMENT_DYNCREATE(CMyView, CView)

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BEGIN_MESSAGE_MAP(CMyView, CView) ON_WM_LBUTTONDOWN() ON_WM_LBUTTONUP() ON_WM_MOUSEMOVE() ON_WM_RBUTTONDOWN()

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()

// 更新初始化：当建立新文档或打开文档时调用 void CMyView::OnInitialUpdate() {

CView::OnInitialUpdate(); Invalidate(); }

// 绘制视图：程序开始运行或窗体发生变化时自动调用 void CMyView::OnDraw(CDC* pDC) {

CMyDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc);

for(int i=0; im_chipList[i].DrawChip(pDC); }

// 消息响应：用户点击鼠标左键时调用

void CMyView::OnLButtonDown(UINT nFlags, CPoint point) {

CMyDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc);

for(int i=CHIP_COUNT-1; i>=0; i--) if(pDoc->m_chipList[i].PtInChip(point)) {

SetCapture(); m_bCaptured = TRUE; m_pointMouse = point; m_nCurrIndex = i; break; } }

// 释放鼠标左键

void CMyView::OnLButtonUp(UINT nFlags, CPoint point) {

if(m_bCaptured) {

::ReleaseCapture(); m_bCaptured = FALSE; } }

// 移动鼠标左键

void CMyView::OnMouseMove(UINT nFlags, CPoint point) {

if(m_bCaptured) {

CMyDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc);

InvalidateRect(pDoc->m_chipList[m_nCurrIndex].GetRect());

CSize offset(point-m_pointMouse);

pDoc->m_chipList[m_nCurrIndex].MoveTo(offset); InvalidateRect(pDoc->m_chipList[m_nCurrIndex].GetRect());

m_pointMouse = point; pDoc->SetModifiedFlag(); } }

// 按下鼠标右键: 旋转拼图块

void CMyView::OnRButtonDown(UINT nFlags, CPoint point) {

CMyDoc* pDoc = GetDocument(); ASSERT_VALID(pDoc);

for(int i=CHIP_COUNT-1; i>=0; i--) if(pDoc->m_chipList[i].PtInChip(point)) {

InvalidateRect(pDoc->m_chipList[i].GetRect()); pDoc->m_chipList[i].Rotation();

InvalidateRect(pDoc->m_chipList[i].GetRect(), FALSE); pDoc->SetModifiedFlag(); break; } }

// 准备打印：设置打印参数

BOOL CMyView::OnPreparePrinting(CPrintInfo* pInfo) {

pInfo->SetMaxPage(1);

return DoPreparePrinting(pInfo); } //

主

框

架

类

////////////////////////////////////////////////// class CMainFrame : public CFrameWnd {

DECLARE_DYNCREATE(CMainFrame) };

IMPLEMENT_DYNCREATE(CMainFrame, CFrameWnd) //

应

用

程

序

类

///////////////////////////////////////////////

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#define IDR_MAINFRAME 128 // 主框架的资源代号 class CMyApp : public CWinApp { public:

virtual BOOL InitInstance(); DECLARE_MESSAGE_MAP() };

BEGIN_MESSAGE_MAP(CMyApp, CWinApp)

ON_COMMAND(ID_FILE_NEW, CWinApp::OnFileNew) ON_COMMAND(ID_FILE_OPEN, CWinApp::OnFileOpen) ON_COMMAND(ID_FILE_PRINT_SETUP, CWinApp::OnFilePrintSetup) END_MESSAGE_MAP()

// 初始化程序实例：建立并登记文档模板 BOOL CMyApp::InitInstance() {

CSingleDocTemplate* pDocTemplate; pDocTemplate = new CSingleDocTemplate( IDR_MAINFRAME,

RUNTIME_CLASS(CMyDoc), RUNTIME_CLASS(CMainFrame), RUNTIME_CLASS(CMyView)); AddDocTemplate(pDocTemplate); CCommandLineInfo cmdInfo; ParseCommandLine(cmdInfo);

if (!ProcessShellCommand(cmdInfo)) return FALSE;

m_pMainWnd->ShowWindow(SW_SHOWMAXIMIZED); return TRUE; }

// 全局应用程序对象 CMyApp theApp;

7-23 为例9-3的吹泡泡程序添加一标识符为IDI_MAINICON的图标（该图标应已按11.8：“向项目中添加资源”中的方法建立并加入项目）。

说 明：建立项目的方法见9.8：“用Visual C++集成开发环境开发Win32应用程序”。 程 序：

在例9-3程序前面添加一文件包含命令： #include ”resource.h”

并将CMyApp::InitInstance（）函数修改为： BOOL CMyApp::InitInstance() {

HICON hIcon;

hIcon = LoadIcon(IDI_MAINICON); // 载入图标 CMyWnd *pFrame = new CMyWnd; pFrame->Create(0,_T(\吹泡泡程序\

pFrame->SetIcon(hIcon, TRUE); // 设置大图标 pFrame->SetIcon(hIcon, FALSE); // 设置小图标 pFrame->ShowWindow(m_nCmdShow); this->m_pMainWnd = pFrame; return TRUE; }

7-24 显示一张位图文件（.BMP）。

说 明：首先建立Win32 Application空白项目和源代码文件（不要忘记设置项目使之可以使用MFC类库），然后按11.8：“向项目中添加资源”的方法为项目建立资源文件，并将待显示的位图文件作为资源装入项目。 程 序：

// Example 11-2：显示BMP图片 #include #include \// 框架窗口类

class CMyWnd: public CFrameWnd {

CBitmap m_Bitmap; int m_nHeight; int m_nWidth; public: CMyWnd(); protected:

afx_msg void OnPaint(); DECLARE_MESSAGE_MAP() };

// 消息映射

BEGIN_MESSAGE_MAP(CMyWnd, CFrameWnd) ON_WM_PAINT() END_MESSAGE_MAP() // 框架窗口类的成员函数 CMyWnd::CMyWnd() {

m_Bitmap.LoadBitmap(IDB_BITMAP1); BITMAP BM;

m_Bitmap.GetBitmap(&BM); m_nWidth = BM.bmWidth; m_nHeight = BM.bmHeight; }

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// 响应绘制窗口客户区消息 void CMyWnd::OnPaint() {

CPaintDC dc(this); CDC MemDC;

MemDC.CreateCompatibleDC(NULL); MemDC.SelectObject(&m_Bitmap);

dc.BitBlt(0,0,m_nWidth,m_nHeight,&MemDC,0,0,SRCCOPY); }

// 应用程序类

class CMinMFCApp: public CWinApp { public:

BOOL InitInstance(); };

// 应用程序类的成员函数 // 初始化应用程序实例

BOOL CMinMFCApp::InitInstance() {

CMyWnd *pFrame = new CMyWnd;

pFrame->Create(0,_T(\ pFrame->ShowWindow(m_nCmdShow); this->m_pMainWnd = pFrame; return TRUE; }

// 全局应用程序对象 CMinMFCApp ThisApp;

7-25 修改11-2，使之可以不同比例放大或缩小图象。 说 明：使用StretchBlt（）函数代替BitBlt（）函数就可实现图象的缩放显示。在项目中加入一个弹出式菜单（将标识符改为IDR_MAINMENU），内含3个菜单选项：缩小1倍显示，按原尺寸显示和放大1倍显示，其标识符分别改为ID_SHRINK，ID_BESTFIT和ID_ZOOMOUT。 程 序：

// Example 11-3：以不同尺寸显示BMP图片 #include #include \// 框架窗口类

class CMyWnd: public CFrameWnd {

CBitmap m_Bitmap; float m_fTimes; int m_nHeight;

int m_nWidth; public: CMyWnd();

BOOL PreCreateWindow(CREATESTRUCT &cs); protected:

afx_msg void OnPaint(); afx_msg void OnShrink(); afx_msg void OnBestFit(); afx_msg void OnZoomOut(); DECLARE_MESSAGE_MAP() };

// 消息映射

BEGIN_MESSAGE_MAP(CMyWnd, CFrameWnd) ON_WM_PAINT()

ON_COMMAND(ID_SHRINK, OnShrink) ON_COMMAND(ID_BESTFIT, OnBestFit) ON_COMMAND(ID_ZOOMOUT, OnZoomOut) END_MESSAGE_MAP() // 主窗口类的成员函数 CMyWnd::CMyWnd() {

BITMAP BM;

m_Bitmap.LoadBitmap(IDB_BITMAP1); m_Bitmap.GetBitmap(&BM); m_nWidth = BM.bmWidth; m_nHeight = BM.bmHeight; m_fTimes = 1.0; }

// 装入菜单

BOOL CMyWnd::PreCreateWindow(CREATESTRUCT &cs) { cs.hMenu

=

LoadMenu(NULL,

MAKEINTRESOURCE(IDR_MAINMENU)); return CFrameWnd::PreCreateWindow(cs); }

// 缩小图象

void CMyWnd::OnShrink() {

m_fTimes = 0.5; Invalidate(); }

// 放大图象

void CMyWnd::OnZoomOut() {

m_fTimes = 2.0; Invalidate(); }

// 原样显示

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