面向對象編程技術實習報告.doc

面向對象編程技術實驗四實驗報告班 級：通信2 班學 號：201000800212姓 名： 王煜瑩時 間：2012-10-20目錄1 實驗要求32 實驗過程及結果3A、對話框部分：3B、圖形繪制函數(shù)的使用5C、定時器使用103 問題及解決方案114 實驗總結11附件12關鍵程序代碼12A、對話框部分：12B、自定義對話框：151 實驗要求 掌握通用對話框和自定義對話框的使用；掌握圖形繪制函數(shù)的使用；掌握定時器的設置和定時消息響應。2 實驗過程及結果A、對話框部分：1. 研究第五章示例程序，理解通用對話框、自定義對話框的使用方式，為本次實驗打基礎。2. 在自己的工作目錄中建立新工程。從已有的示例程序中選取適當?shù)拇a，修改形成自己的框架。代碼整理過程中要特別注意代碼的格式。源文件名后綴必須是.cpp，不可以是.c3. 增加對WM_PAINT消息的處理，在窗口客戶區(qū)輸出文本。case WM_PAINT: hdc = BeginPaint (hWnd, &ps); GetClientRect (hWnd, &rect);DrawText (hdc, TEXT (歡迎使用), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);EndPaint (hWnd, &ps);return 0; 4. 增加菜單資源，要求至少包含“更改文本顏色”和“更改背景顏色”兩個命令。 5. 自定義一個簡單的對話框，該對話框內至少有一個“選擇背景色”按鈕和一個靜態(tài)文本框（或Edit框）以及確定、取消兩個按鈕。該簡單對話框的處理邏輯為：點擊“選擇背景色”按鈕，彈出通用對話框選擇顏色，選擇完顏色后，將顏色值顯示到靜態(tài)文本框（或Edit框）中。再點擊該對話框的“確定”按鈕，可將結果顏色值通過變量交接給外部程序使用。6. 編寫上述自定義對話框的處理函數(shù)。switch(LOWORD(wParam)case IDM_SET_BKColor:if (DialogBox ( (HINSTANCE)GetWindowLong (hWnd, GWL_HINSTANCE), MAKEINTRESOURCE(IDD_DIALOG1), hWnd, ColorDlgProc)=IDOK)if (change)hold=(HBRUSH)GetWindowLong(hWnd,GCL_HBRBACKGROUND);SetClassLong(hWnd,GCL_HBRBACKGROUND,(LONG)CreateSolidBrush(g_Color);change=TRUE;if (change) DeleteObject(hold); InvalidateRect(hWnd,NULL,TRUE);case IDM_SET_SCRIPTColor:if (ChooseColor (&cc)crText=cc.rgbResult;InvalidateRect (hWnd, NULL, TRUE);7. 增加響應菜單命令的代碼。 在“更改文本顏色”命令的響應中調用通用顏色對話框選擇新的顏色。新選定的文本顏色用全局變量或靜態(tài)變量保存，在主窗口刷新消息（WM_PAINT）處理中用該顏色顯示原來輸出的文本。case IDC_BUT_SELCOLOR:SetDlgItemInt(hDlg, IDC_COLORVALUE, GetMyColor(hDlg), FALSE); return TRUE; case WM_PAINT: hdc = BeginPaint (hWnd, &ps); GetClientRect (hWnd, &rect);SetTextColor (hdc, crText);DrawText (hdc, TEXT (歡迎使用), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);EndPaint (hWnd, &ps);return 0; 更改背景顏色命令響應中激活自定義對話框，對話框結束后，根據(jù)選擇的顏色，結合SetClassLong和CreateSolidBrush函數(shù)，創(chuàng)建新的畫刷，并替換原來主窗口類使用的畫刷。if (change)hold=(HBRUSH)GetWindowLong(hWnd,GCL_HBRBACKGROUND);SetClassLong(hWnd,GCL_HBRBACKGROUND,(LONG)CreateSolidBrush(g_Color);change=TRUE;if (change) DeleteObject(hold); InvalidateRect(hWnd,NULL,TRUE);8. 刷新窗口看顯示結果是否符合要求（可在設置完顏色或畫刷之后直接用InvalidateRect函數(shù)激發(fā)WM_PAINT消息）。B、圖形繪制函數(shù)的使用1. 研習EASYGDI示例程序。查看各個GDI繪制函數(shù)的使用方法。2. 在自己的工作目錄中建立新工程。要求同2。3. 增加對WM_PAINT消息的處理，在其中使用：PolylinePolyPolylinePolygonPolyPolygon等函數(shù)，注意在WM_PAINT消息中對HDC的獲取和釋放使用的函數(shù)是BeginPaint和EndPaint函數(shù)。 switch(iSelectionFunc)case IDM_FUNC_POLYLINE:ptDiamond0.x = 0;ptDiamond0.y = rect.bottom / 2;ptDiamond1.x = rect.right / 2;ptDiamond1.y = 0;ptDiamond2.x = rect.right;ptDiamond2.y = rect.bottom / 2;ptDiamond3.x = rect.right / 2;ptDiamond3.y = rect.bottom;ptDiamond4.x = 0;ptDiamond4.y = rect.bottom / 2;Polyline (hdc, ptDiamond, 5);break;case IDM_FUNC_POLYGON:if (GetPolyFillMode(hdc)=WINDING)SetPolyFillMode(hdc, ALTERNATE);elseSetPolyFillMode(hdc, WINDING);ptDiamond0.x = 0;ptDiamond0.y = rect.bottom / 3;ptDiamond1.x = rect.right;ptDiamond1.y = rect.bottom / 3;ptDiamond2.x = rect.right / 4;ptDiamond2.y = rect.bottom;ptDiamond3.x = rect.right / 2;ptDiamond3.y = 0;ptDiamond4.x = 3 * rect.right / 4;ptDiamond4.y = rect.bottom;Polygon (hdc, ptDiamond, 5);break;case IDM_FUNC_POLYPOLYLINE: ptDiamond20.x = 0;ptDiamond20.y = rect.bottom / 4;ptDiamond21.x = rect.right / 4;ptDiamond21.y = 0;ptDiamond22.x = rect.right;ptDiamond22.y = rect.bottom / 4;ptDiamond23.x = rect.right / 4;ptDiamond23.y = rect.bottom;ptDiamond24.x = 0;ptDiamond24.y = rect.bottom / 4; ptDiamond25.x = 0;ptDiamond25.y =3 * rect.bottom / 4;ptDiamond26.x =3 * rect.right / 4;ptDiamond26.y = 0;ptDiamond27.x = rect.right;ptDiamond27.y =3 * rect.bottom / 4;ptDiamond28.x = 3 *rect.right / 4;ptDiamond28.y = rect.bottom;ptDiamond29.x = 0;ptDiamond29.y = 3 *rect.bottom / 4;PolyPolyline (hdc, ptDiamond2, b,2);break;case IDM_FUNC_POLYPOLYGON:if (GetPolyFillMode(hdc)=WINDING)SetPolyFillMode(hdc, ALTERNATE);elseSetPolyFillMode(hdc, WINDING);ptDiamond30.x = 0;ptDiamond30.y = rect.bottom / 6;ptDiamond31.x = rect.right;ptDiamond31.y = rect.bottom /6;ptDiamond32.x = rect.right / 4;ptDiamond32.y = rect.bottom / 2;ptDiamond33.x = rect.right /2;ptDiamond33.y = 0;ptDiamond34.x = 3 * rect.right / 4;ptDiamond34.y = rect.bottom/2; ptDiamond35.x = 0;ptDiamond35.y = 2* rect.bottom / 3;ptDiamond36.x = rect.right;ptDiamond36.y = 2*rect.bottom /3;ptDiamond37.x = rect.right / 4;ptDiamond37.y = rect.bottom;ptDiamond38.x = rect.right /2;ptDiamond38.y = rect.bottom /2;ptDiamond39.x = 3 * rect.right / 4;ptDiamond39.y = rect.bottom;PolyPolygon (hdc, ptDiamond3, c,2);break;4. 按與Polyline相同的函數(shù)格式編寫自定義的折線繪制函數(shù)，新函數(shù)命名為MyPolyline（用MoveToEx和LineTo實現(xiàn)），用該函數(shù)替換上一步代碼（11）中的Polyline，應該獲得同樣的運行結果。BOOL MyPolyline(HDC hdc,CONST POINT *lppt,int cPoints)MoveToEx(hdc,(*lppt).x,(*lppt).y,NULL);for (int i=1;icPoints;i+)LineTo(hdc,(*(lppt+i).x,(*(lppt+i).y);return TRUE;5. 編寫MyPolyPolyline和MyPolyPolygon，替換11中相應的庫函數(shù)，獲得同樣的運行結果，以此加深對函數(shù)編寫、指針方式參數(shù)傳遞的理解。BOOL MyPolyPolyline(HDC hdc,CONST POINT *lppt,CONST DWORD *lpdwPolyPoints,int count)int i=0;for (int n=0;ncount;n+)MyPolyline(hdc,lppt+i,*(lpdwPolyPoints+n);i+=*(lpdwPolyPoints+n);return TRUE;BOOL MyPolyPolygon(HDC hdc,CONST POINT*lpPoints,CONST INT*lpPolyCounts,int nCount)PolyPolygon(hdc,lpPoints,lpPolyCounts,nCount);return TRUE;6. 一個工程多個.cpp文件的試驗：可嘗試將這些自定義函數(shù)用單獨的.cpp文件管理，并編寫相應的頭文件，使這些函數(shù)可以在其他.cpp文件中被調用。7. 在調試完上述代碼的基礎上增加繪圖函數(shù)的使用，嘗試繪制橢圓、矩形等圖形。case IDM_FUNC_RECTANGLE:Rectangle (hdc, rect.right / 4, rect.bottom / 4, 3 * rect.right / 4, 3 * rect.bottom / 4);break;case IDM_FUNC_ROUNDRECT:RoundRect (hdc, rect.right / 4, rect.bottom / 4, 3 * rect.right / 4, 3 * rect.bottom / 4, rect.right / 4, rect.bottom / 4);break;C、定時器使用8. 在WM_CREATE消息中增加設置定時器的代碼（用SetTimer函數(shù)）；case WM_CREATE: /創(chuàng)建消息SetTimer(hWnd,1,1000,NULL);return 0;9. 在窗口過程的消息處理代碼中增加WM_TIMER消息的處理，處理的內容包括： 用SYSTEMTIME結構定義一個時間結構變量 用GetSysteTime函數(shù)或GetLocalTime函數(shù)取出系統(tǒng)時間或本地時間 將時間值打印成字符串（可以使用wsprintf函數(shù)或sprintf函數(shù)） 使用GetDC函數(shù)獲取HDC 用TextOut 或 DrawText函數(shù)輸出文本 用ReleaseDC函數(shù)釋放先前獲取的HDC上述操作完成后，能夠在窗口客戶區(qū)中看到不斷刷新的時間顯示。case WM_TIMER:GetLocalTime(&systemtime); InvalidateRect (hWnd, NULL, TRUE);return 0;case WM_PAINT: wsprintf(str, %s %u/%u/%u %u:%u:%u, day, systemtime.wYear, systemtime.wMonth, systemtime.wDay, systemtime.wHour, systemtime.wMinute, systemtime.wSecond, systemtime.wMilliseconds); DrawTextA(hdc,str,strlen(str),&rect,DT_CENTER|DT_SINGLELINE|DT_VCENTER); EndPaint (hWnd, &ps);10. 在WM_DESTROY消息中增加刪除已創(chuàng)建的定時器的代碼（用KillTimer函數(shù)）case WM_DESTROY:KillTimer(hWnd,NULL);PostQuitMessage(0);return 0;3 問題及解決方案1 調用通用顏色對話框的時候要先添加到自定義顏色中才可使其變色，為使其更方便，將代碼ctText=crCustomColors0;改為ctText=cc.rgbResult;2 編寫MyPolyPolyline函數(shù)時，出現(xiàn)很多問題，先是在編寫函數(shù)時總是不能實現(xiàn)特定的功能，調用時忘記申明，最后編寫時仔細理解了LineTo和MoveToEx，利用這兩個函數(shù)先寫出了MyPolyline，然后在這基礎上編寫了MyPolyPolyline；3 MyPolyPolygon編寫時也同樣出現(xiàn)很多問題，沒法實現(xiàn)填充，最后直接調用的PolyPolygon，編寫時按照一個在頭文件中編寫，另一個新建一個cpp，理解函數(shù)的調用；#include BOOL MyPolyPolygon(HDC hdc,CONST POINT*lpPoints,CONST INT*lpPolyCounts,int nCount)PolyPolygon(hdc,lpPoints,lpPolyCounts,nCount);return TRUE;4 在定時器的編寫時運行無錯，卻總是出現(xiàn)528528528，無法成功計時，此時#define Time 1；SetTimer(hWnd,1,1000,NULL);確認無錯的情況下，將GetSystem(&systemtime);改為GetLocalTime(&systemtime);可成功計時；5 編寫時依舊存在括號漏寫，未定義等錯誤，在出現(xiàn)錯誤很多的情況下檢查括號是否漏寫，未定義的在定義的類型上要仔細考慮，不能把類型弄錯；4 實驗總結 這次的實驗，總體來說不向以往幾次都是趕著上交之前才完成，有了一定的進步吧。初次拿到題目時還是一樣的大量的題目，然而仔細的去一點點的研究，去做的時候發(fā)現(xiàn)也許有了上幾次的練習作為積淀，做起來也不向以前一樣剛開始毫無頭緒。在仔細的研究完實例程序后，按照特定的步驟和方法都能一步步的做出來。也許是有著實例程序的運用，為我們提供了很多的借鑒及參考。這次的實驗中花費時間最長的是函數(shù)的編寫，因為知道自己的弱點一直在函數(shù)這邊，所以這次的練習在函數(shù)上下了很大的功夫。雖然說是簡單的函數(shù)編寫，但是我還是經過了多次的推敲，嘗試，最終順利的實現(xiàn)時的卻十分開心。在一次次的實驗中，看著一點點的進步，從不妄想能夠一步登天，亦知自己還需努力，于是耐下心來一點點的去做，去積累，去領悟編程的思想。附件關鍵程序代碼A、對話框部分：#include #include #include resource.hBOOL InitWindow (HINSTANCE hInstance, int nCmdShow);LRESULT CALLBACK MainWndProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);COLORREF GetMyColor(HWND hWnd)COLORREF cr = 0;CHOOSECOLOR cc;COLORREF crCustomColors16;/初始化CHOOSECOLOR結構變量 cccc.lStructSize = sizeof (CHOOSECOLOR);cc.hwndOwner = hWnd;cc.hInstance = NULL;cc.rgbResult = RGB (0, 0, 0);cc.lpCustColors = crCustomColors;cc.Flags = CC_RGBINIT | CC_FULLOPEN;cc.lCustData = 0;cc.lpfnHook = NULL;cc.lpTemplateName = NULL;if (ChooseColor (&cc)cr = cc.rgbResult;return cr;COLORREF g_Color;BOOL CALLBACK ColorDlgProc (HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)BOOL b; static int iColor; /用戶選擇的顏色 switch (message) case WM_INITDIALOG: /先設置為紅色 CheckRadioButton (hDlg, IDC_RADIO_RED, IDC_RADIO_GREEN, IDC_RADIO_RED); SetDlgItemInt (hDlg, IDC_COLORVALUE, RGB(255,0,0), FALSE); return FALSE; case WM_COMMAND:/處理對話框中各控件通知消息 switch (LOWORD (wParam) case IDOK: /響應確認按鈕，改寫文本顏色 iCurrentColor 為iColor g_Color = GetDlgItemInt(hDlg, IDC_COLORVALUE, &b, FALSE); /關閉對話框 EndDialog (hDlg, TRUE); /關閉對話框 return TRUE; case IDCANCEL: /響應取消按鈕，直接關閉對話框 EndDialog (hDlg, FALSE); return TRUE;case IDC_BUT_SELCOLOR:SetDlgItemInt(hDlg, IDC_COLORVALUE, GetMyColor(hDlg), FALSE);return TRUE; case IDC_RADIO_RED: case IDC_RADIO_GREEN: case IDC_RADIO_BLUE: CheckRadioButton (hDlg, IDC_RADIO_RED, IDC_RADIO_BLUE, LOWORD (wParam);switch(LOWORD (wParam)case IDC_RADIO_RED: SetDlgItemInt (hDlg, IDC_COLORVALUE, RGB(255,0,0), FALSE); break;case IDC_RADIO_GREEN: SetDlgItemInt (hDlg, IDC_COLORVALUE, RGB(0,255,0), FALSE); break;case IDC_RADIO_BLUE: SetDlgItemInt (hDlg, IDC_COLORVALUE, RGB(0,0,255), FALSE); break; return TRUE; break; return FALSE;/結束 ColorDlgProcint WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow).LRESULT CALLBACK MainWndProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)static HWND hWndEdit;static HMENU hMenuPop;HDC hdc;PAINTSTRUCT ps;RECT rect;static COLORREF crText = RGB (0, 0, 0);static BOOL change=FALSE;HBRUSH hold; static CHOOSECOLOR cc;static COLORREF crCustomColors16;switch (message)case WM_CREATE:/初始化結構 cccc.lStructSize = sizeof (CHOOSECOLOR);cc.hwndOwner = hWnd;cc.hInstance = NULL;cc.rgbResult = RGB (0, 0, 0);cc.lpCustColors = crCustomColors;cc.Flags = CC_RGBINIT | CC_FULLOPEN;cc.lCustData = 0;cc.lpfnHook = NULL;cc.lpTemplateName = NULL; hMenuPop = LoadMenu (LPCREATESTRUCT)lParam)-hInstance, IDR_MENU1); hMenuPop = GetSubMenu (hMenuPop, 1);return 0;case WM_SETFOCUS:SetFocus (hWndEdit);return 0;case WM_COMMAND: / 響應編輯控件通知消息if (lParam)WORD w, W1, W2, W3;w = LOWORD (wParam);W1 = HIWORD(wParam);W2 = LOWORD (lParam);W3 = HIWORD(lParam);/編輯控件通知消息if (LOWORD (wParam) = 1) &(HIWORD(wParam) = EN_ERRSPACE | HIWORD (wParam) = EN_MAXTEXT)MessageBox (hWnd,TEXT (編輯控件內存溢出), TEXT (菜單示例程序), MB_OK|MB_ICONSTOP);return 0;elseswitch(LOWORD(wParam);case IDM_SET_BKColor:if (DialogBox ( (HINSTANCE)GetWindowLong (hWnd, GWL_HINSTANCE), MAKEINTRESOURCE(IDD_DIALOG1), hWnd, ColorDlgProc)=IDOK)if (change)hold=(HBRUSH)GetWindowLong(hWnd,GCL_HBRBACKGROUND);SetClassLong(hWnd,GCL_HBRBACKGROUND,(LONG)CreateSolidBrush(g_Color);change=TRUE;if (change) DeleteObject(hold); InvalidateRect(hWnd,NULL,TRUE);case IDM_SET_SCRIPTColor:if (ChooseColor (&cc)crText=cc.rgbResult;InvalidateRect (hWnd, NULL, TRUE);return 0;return 0;case WM_PAINT: hdc = BeginPaint (hWnd, &ps); GetClientRect (hWnd, &rect);SetTextColor (hdc, crText);DrawText (hdc, TEXT (歡迎使用), -1, &rect, DT_SINGLELINE | DT_CENTER | DT_VCENTER);EndPaint (hWnd, &ps);return 0;case WM_DESTROY: PostQuitMessage (0);return 0;return DefWindowProc (hWnd, message, wParam, lParam); /函數(shù) MainWndProc 結束B、自定義對話框：#include #include #include resource.h#include mypolyolygon.hBOOL InitWindow (HINSTANCE hInstance, int nCmdShow);LRESULT CALLBACK WinProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);BOOL MyPolyline(HDC hdc,CONST POINT *lppt,int cPoints);.LRESULT CALLBACK WinProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)HDC hdc;PAINTSTRUCT ps;RECT rect;LOGPEN logpen;CONST DWORD b2=5,5;int c2=5,5; static HMENU hMenuPop;HMENU hMenu;static int iSelectionFunc=IDM_FUNC_POLYLINE;static int iSelectionPen=IDM_PEN_BLACK;static int iSelectionBrush=IDM_BRUSH_WHITE;static HPEN hRedDashdotPen, hBlueSolidPen;HPEN hOldPen;HBRUSH hNewBrush, hOldBrush;POINT ptDiamond5;POINT ptDiamond210;POINT ptDiamond310, pt;switch (message)case WM_CREATE:hRedDashdotPen = CreatePen (PS_DASHDOT, 1, RGB (255, 0, 0);/創(chuàng)建寬度為3的藍色畫筆logpen.lopnStyle = PS_SOLID;logpen.lopnWidth.x = 3;logpen.lopnColor = RGB (0, 0, 255); hBlueSolidPen = CreatePenIndirect (&logpen); hMenuPop = LoadMenu (LPCREATESTRUCT)lParam)-hInstance, IDR_MENU1);hMenuPop = GetSubMenu (hMenuPop, 1);return 0;case WM_COMMAND: hMenu = GetMenu (hWnd) ; switch (LOWORD (wParam) case IDM_FUNC_POLYPOLYLINE:case IDM_FUNC_POLYLINE:case IDM_FUNC_POLYGON:case IDM_FUNC_POLYPOLYGON:case IDM_FUNC_LINETO:case IDM_FUNC_RECTANGLE:case IDM_FUNC_ROUNDRECT:case IDM_FUNC_MYPOLYPOLYLINE:case IDM_FUNC_MYPOLYPOLYGON: CheckMenuItem(hMenu,iSelectionFunc,MF_UNCHECKED); iSelectionFunc=LOWORD(wParam); CheckMenuItem(hMenu,iSelectionFunc,MF_CHECKED); InvalidateRect(hWnd,NULL,TRUE); return 0;case IDM_PEN_BLACK:case IDM_PEN_REDDASHDOT:case IDM_PEN_BLUESOLID: CheckMenuItem(hMenu,iSelectionPen,MF_UNCHECKED);iSelectionPen=LOWORD(wParam); CheckMenuItem(hMenu,iSelectionPen,MF_CHECKED); InvalidateRect(hWnd,NULL,TRUE);return 0;case IDM_BRUSH_WHITE: case IDM_BRUSH_LTGRAY:case IDM_BRUSH_COLORSOLID: case IDM_BRUSH_CROSS:CheckMenuItem (hMenu, iSelectionBrush, MF_UNCHECKED) ; iSelectionBrush = LOWORD (wParam) ; CheckMenuItem (hMenu, iSelectionBrush , MF_CHECKED) ; InvalidateRect (hWnd, NULL, TRUE) ; return 0 ;case WM_KEYDOWN: switch (wParam)case VK_ESCAPE:MessageBox (hWnd, TEXT (ESC鍵按下了!), TEXT (鍵盤), MB_OK);break;return 0;case WM_RBUTTONDOWN: /鼠標消息MessageBox (hWnd, TEXT (鼠標右鍵按下了!), TEXT (鼠標), MB_OK);return 0;case WM_PAINT: /客戶區(qū)重繪消息hdc = BeginPaint (hWnd, &ps); GetClientRect (hWnd, &rect); /選用新畫筆switch (iSelectionPen)case IDM_PEN_BLACK:hOldPen =(HPEN) SelectObject (hdc, GetStockObject(BLACK_PEN);break;case IDM_PEN_REDDASHDOT:hOldPen = (HPEN)SelectObject (hdc, hRedDashdotPen);break;case IDM_PEN_BLUESOLID:hOldPen =(HPEN) SelectObject (hdc, hBlueSolidPen);break; /選用新畫刷switch (iSelectionBrush)case IDM_BRUSH_WHITE:hOldBrush = (HBRUSH)SelectObject (hdc, GetStockObject(WHITE_BRUSH);break;case IDM_BRUSH_LTGRAY:hOldBrush =(HBRUSH) SelectObject (hdc, GetStockObject(LTGRAY_BRUSH);break;case IDM_BRUSH_COLORSOLID:/創(chuàng)建并選擇彩色實體畫刷hNewBrush =(HBRUSH) CreateSolidBrush (RGB (0, 255, 255);hOldBrush =(HBRUSH) SelectObject (hdc, hNewBrush);break;case IDM_BRUSH_CROSS:/創(chuàng)建并選擇綠色十字影線畫刷hNewBrush =(HBRUSH) CreateHatchBrush (HS_CROSS, RGB (0, 255, 0);hOldBrush = (HBRUSH)SelectObject (hdc, hNewBrush);break; switch(iSelectionFunc)case IDM_FUNC_POLYLINE:ptDiamond0.x = 0;ptDiamond0.y = rect.bottom / 2;ptDiamond1.x = rect.right / 2;ptDiamond1.y = 0;ptDiamond2.x = rect.right;ptDiamond2.y = rect.bottom / 2;ptDiamond3.x = rect.right / 2;ptDiamond3.y = rect.bottom;ptDiamond4.x = 0;ptDiamond4.y = rect.bottom / 2;Polyline (hdc, ptDiamond, 5);break;case IDM_FUNC_POLYGON:if (GetP