C语言程序设计（郑莉）课后习题答案

7-22 修改例11-4的拼图程序，使之在难度菜单的相应选项前打钩。程序：

首先在框架窗口类的消息响应函数声明处增加以下消息响应函数的声明： afx_msg void

CPuzzleWnd::OnUpdateGrad01(CCmdUI*

pCmdUI); afx_msg void

CPuzzleWnd::OnUpdateGrad02(CCmdUI*

pCmdUI); afx_msg void

CPuzzleWnd::OnUpdateGrad03(CCmdUI*

pCmdUI);

然后在框架窗口类的消息映射宏中加入相应内容： BEGIN_MESSAGE_MAP(CPuzzleWnd, CFrameWnd) ON_WM_LBUTTONDOWN() ON_WM_LBUTTONUP() ON_WM_MOUSEMOVE() ON_WM_PAINT()

ON_COMMAND(ID_SHOWFIG, OnShowFig) ON_COMMAND(ID_GRAD01, OnGrad01) ON_COMMAND(ID_GRAD02, OnGrad02) ON_COMMAND(ID_GRAD03, OnGrad03)

ON_UPDATE_COMMAND_UI(ID_GRAD01, OnUpdateGrad01) ON_UPDATE_COMMAND_UI(ID_GRAD02, OnUpdateGrad02) ON_UPDATE_COMMAND_UI(ID_GRAD03, OnUpdateGrad03) END_MESSAGE_MAP()

注意更新命令用户接口消息映射宏将菜单标识符与相应的消息映射函数联系在一起。最后编写相应的更新命令用户接口消息映射函数：

void CPuzzleWnd::OnUpdateGrad01(CCmdUI* pCmdUI) {

pCmdUI->SetCheck(m_nColCount == 4); }

void CPuzzleWnd::OnUpdateGrad02(CCmdUI* pCmdUI) {

pCmdUI->SetCheck(m_nColCount == 8); }

void CPuzzleWnd::OnUpdateGrad03(CCmdUI* pCmdUI) {

pCmdUI->SetCheck(m_nColCount == 16); }

输入输出：在选择拼图难度时，可在相应选项前打钩（图13-4）。

// Example 13-7: 七巧板程序

////////////////////////////////// #include #include //

拼

板

类

//////////////////////////////////////////////////// #define MAX_POINTS 4 #define CHIP_WIDTH 240 #define DELTA 30

class CChip : public CObject {

DECLARE_SERIAL(CChip) int m_nType;

CPoint m_pointList[MAX_POINTS]; int m_nPointCount; public: CChip(){}

void SetChip(int type, POINT *ppointlist, int count); void DrawChip(CDC *pDC); BOOL PtInChip(POINT point); LPCRECT GetRect();

void MoveTo(CSize offset); void Rotation();

void Serialize(CArchive &ar); };

IMPLEMENT_SERIAL(CChip, CObject, 1) // 设置拼图块参数

void CChip::SetChip(int type, POINT *ppointlist, int count) {

m_nType = type; m_nPointCount = count; for(int i=0; i

// 绘出拼图块

void CChip::DrawChip(CDC *pDC) {

CPen penNew, *ppenOld; CBrush brushNew, *pbrushOld; switch(m_nType) { case 1:

brushNew.CreateSolidBrush(RGB(127, 127, 127)); break; case 2:

brushNew.CreateSolidBrush(RGB(255, 0, 0)); break;

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)

// 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)

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

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

C语言程序设计（郑莉）课后习题答案

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