VC-6.0-下MFC基于對(duì)話框-繪制圖形

1、附錄表一、具體步驟：1、選擇菜單欄的“新建”，選擇MFC項(xiàng)目名為DrawGraphics,并設(shè)置為基于對(duì)話框的項(xiàng)目，如圖-1、圖-2所示；圖-12、按下鍵盤上的Ctrl+W鍵，調(diào)出類向?qū)Вx擇"AddClass”,并點(diǎn)擊"New”添加一個(gè)顏色按鈕類CColorButton,繼承自CButton類，如圖-3所示：圖-33、在CColorButton中添加如下成員變量：COLORREFcolor;按鈕顏色CPointarrays4;按鈕頂點(diǎn)坐標(biāo)BOOLIsShow;/是否顯示按鈕BOOLIsPressed;按鈕是否被按下4、右擊CColorButton類，選擇AddVirtul

2、function,重寫其DraItem函數(shù)，如圖-4,圖-5所示:亡工三日和S蟲空百加,刈_L忸二包或叵_三山定的CDwMGr叫卜liriDIgjJ|(*llmtnihtrl*'.上CAJjQuWIq三pyWGGotoDe4inj5cnAddMeedsFuFUium.AddMrrTfctwrjariabe-AddVirtuaFunctsoriL.AddEndowsHandlcTf-AddioGdlfiy知甑釵WIDCIOhMciUrMirif(IInvalidCDialog:IdCDrduCr圖-4NwVirtualOverridefnrCColorButtonNewVirtualFu

3、nctionsExistingvirtuallunctionoverridesCalcWindowRectCrealeDcfWiiidowPrucRF?strnyWinf1nwDoDataExchngeGe1Scn)IIBarCtrlOnAmbicnlPtupErtyOnChildNotifyOnCndMsgOnCommandOnFlnBlHeleasEOuNnlifyPostNcDestroyPreCrealeWindowPitSubclaiiiiV/iuduwPieTranlateMessageSerializeDrawl配m確定取情AdriHnnrlkrAddandEdilEditExi

4、stingCelcWindowREct):Computesthewindow5izebasedontheclientsize圖-55、為其Drawitem函數(shù)中添加如下代碼:CRectrect;GetClientRect(rect);CDCdc;dc.Attach(lpDrawItemStruct->hDC);arrays0=CPoint(rect.left,rect.top);arrays1=CPoint(rect.right,rect.top);arrays2=CPoint(rect.right,rect.bottom);arrays3=CPoint(rect.left,rect.b

5、ottom);設(shè)置背景透明dc.SetBkMode(TRANSPARENT);if(IsShow)創(chuàng)建一個(gè)位圖畫刷CBrushbrush(color);dc.SelectObject(&brush);CPenpen(PS_NULL,1,color);dc.SelectObject(&pen);dc.Rectangle(rect);if(IsPressed)CPenpen(PS_DASHDOTDOT,3,RGB(0,0,0);dc.SelectObject(&pen);dc.MoveTo(arrays0);for(inti=1;i<4;i+)dc.LineTo(ar

6、raysi);dc.LineTo(arrays0);elseCPenpen(PS_DASHDOTDOT,2,color);dc.SelectObject(&pen);dc.MoveTo(arrays0);for(inti=1;i<4;i+)dc.LineTo(arraysi);dc.LineTo(arrays0);/繪制按鈕文本CStringstr;GetWindowText(str);dc.SetTextColor(RGB(255-GetRValue(color),255-GetGValue(color),255-GetBValue(color);dc.DrawText(str

7、,CRect(0,0,rect.right,rect.bottom),DT_CENTER|DT_VCENTER|DT_SINGLELINE);6、為CColorButton添加屬性設(shè)置函數(shù)：voidCColorButton:SetDrawColor(COLORREFm_color,BOOLIsShow)this->color=m_color;this->IsShow=IsShow;7、為CColorButton添加WM_LBUTTONDOWN和WM_LBUTTONUP消息，其消息處理函數(shù)如下：voidCColorButton:OnLButtonDown(UINTnFlags,CPo

8、intpoint)/TODO:Addyourmessagehandlercodehereand/orcalldefaultIsPressed=true;CButton:OnLButtonDown(nFlags,point);voidCColorButton:OnLButtonUp(UINTnFlags,CPointpoint)/TODO:Addyourmessagehandlercodehereand/orcalldefaultIsPressed=false;CButton:OnLButtonUp(nFlags,point);8、為DrawGraphics項(xiàng)目的中的對(duì)話框資源拖拽如下控件，如圖

9、-6所示，并按表-1設(shè)置其相關(guān)ID;圖-6IDIDC_RADIO_RECTIDC_RADIO_ROUNDIDC_RADIO_LINEIDC_RADIO_SELFIDC_RADIO_SLOIDLINEIDC_RADIO_DOTTEDLINEIDCCOMBOLINEVALUE作用及類別矩形單選按鈕圓形單選按鈕直線單選按鈕涂鴉單選按鈕實(shí)線單選按鈕虛線單選按鈕線條粗細(xì)下拉列表IDC_STATIC_LINEEXAMPLE顯示線條粗細(xì)的 Picture 控件IDC_CHECK_BORDER IDC_RADIO_SOLID IDC_RADIO_GRADIENTIDC_RADIO_NULLIDC_BUTTON

10、_FORECOLORIDC_BUTTON_BKCOLORIDC_RADIO_PENIDC_RADIO_CLEARIDC_STATIC_GRAPHICS是否有邊界復(fù)選框填充單選按鈕漸變單選按鈕無填充單選按鈕前景色按鈕背景色按鈕畫筆單選按鈕清空畫板單選按鈕畫板區(qū)（Picture控件）表-19、打開類向?qū)?，按圖-7所示，為相關(guān)控件添加關(guān)聯(lián)成員:10、在CDrawGraphicsDlg類的OninitDialog函數(shù)中添加初始化代碼:BOOLCDrawGraphicsDlg:OnInitDialog()/*省略無關(guān)代碼*/TODO:AddextrainitializationhereCButton*c

11、b;設(shè)置相關(guān)按鈕的默認(rèn)選中狀態(tài)cb=(CButton*)GetDlgItem(IDC_RADIO_RECT);cb->SetCheck；cb=(CButton*)GetDlgItem(IDC_RADIO_SLOIDLINE);cb->SetCheck；cb=(CButton*)GetDlgItem(IDC_CHECK_BORDER);cb->SetCheck(1);cb=(CButton*)GetDlgItem(IDC_RADIO_SOLID);cb->SetCheck(1);cb=(CButton*)GetDlgItem(IDC_RADIO_PEN);cb->S

12、etCheck(1);m_ComboLineValue.SetCurSel(3);m_ForeColor=RGB(255,0,0);m_BkColor=RGB(0,0,255);m_ForeCButton.SetDrawColor(m_ForeColor,TRUE);/設(shè)置前背景色按鈕的顏色m_BkCButton.SetDrawColor(m_BkColor,TRUE);m_IsPressed=FALSE;m_nWidth=4;m_nPenStyle=PS_SOLID;returnTRUE;/returnTRUEunlessyousetthefocustoacontrol10、為CDrawGr

13、aphicsDlg添加WM_LBUTTONDOWN和WM_LBUTTONUP，WM_MOUSEMOVE消息，其消息處理函數(shù)如下：voidCDrawGraphicsDlg:OnLButtonDown(UINTnFlags,CPointpoint)/TODO:Addyourmessagehandlercodehereand/orcalldefaultm_IsPressed=TRUE;SetCursor(m_Hcursor);if(IsDlgButtonChecked(IDC_RADIO_SELF)m_pOld=point;elseif(IsDlgButtonChecked(IDC_RADIO_LI

14、NE)m_pOld=point;m_PointOrigin=point;elseif(IsDlgButtonChecked(IDC_RADIO_RECT)m_pOld=point;m_PointOrigin=point;elseif(IsDlgButtonChecked(IDC_RADIO_ROUND)m_pOld=point;m_PointOrigin=point;CDialog:OnLButtonDown(nFlags,point);voidCDrawGraphicsDlg:OnLButtonUp(UINTnFlags,CPointpoint)/TODO:Addyourmessagehan

15、dlercodehereand/orcalldefaultm_IsPressed=FALSE;ClipCursor(NULL);/解除鼠標(biāo)的限定CClientDCdc(this);CPenpen(m_nPenStyle,m_nWidth,m_ForeColor);dc.SelectObject(&pen);if(IsDlgButtonChecked(IDC_RADIO_LINE)/選擇的為畫直線dc.SetROP2(R2_NOT);/逆轉(zhuǎn)當(dāng)前屏幕顏色來畫線的繪圖方式dc.MoveTo(m_PointOrigin);dc.LineTo(m_pOld);/擦去上一次的臨時(shí)線dc.SetRO

16、P2(R2_COPYPEN);/缺省繪圖模式，像素為畫筆顏色dc.MoveTo(m_PointOrigin);dc.LineTo(point);/繪制固定線elseif(IsDlgButtonChecked(IDC_RADIO_RECT)/選擇的為畫矩形dc.SelectObject(GetStockObject(NULL_BRUSH);/選擇空話刷dc.SetROP2(R2_NOT);CRectOldrect(m_PointOrigin,m_pOld);dc.Rectangle(&Oldrect);/清除之前的矩形繪圖dc.SetROP2(R2_COPYPEN);CBrushbrus

17、h(m_BkColor);dc.SelectObject(&brush);/畫這次的矩形if(IsDlgButtonChecked(IDC_RADIO_NULL)/如果選擇無填充的話，使用空畫刷dc.SelectObject(GetStockObject(NULL_BRUSH);CRectNowrect(m_PointOrigin,point);dc.Rectangle(&Nowrect);if(IsDlgButtonChecked(IDC_RADIO_GRADIENT)/如果選擇漸變的話，調(diào)用漸變函數(shù)DrawGradient(dc.GetSafeHdc(),Nowrect,m

18、_ForeColor,m_BkColor,1);elseif(IsDlgButtonChecked(IDC_RADIO_ROUND)/如果選擇繪制橢圓dc.SelectObject(GetStockObject(NULL_BRUSH);dc.SetROP2(R2_NOT);CRectOldrect(m_PointOrigin,m_pOld);dc.Ellipse(&Oldrect);dc.SetROP2(R2_COPYPEN);CBrushbrush(m_BkColor);dc.SelectObject(&brush);if(IsDlgButtonChecked(IDC_RAD

19、IO_NULL)dc.SelectObject(GetStockObject(NULL_BRUSH);CRectNowrect(m_PointOrigin,point);if(IsDlgButtonChecked(IDC_RADIO_GRADIENT)/如果選擇漸變的話，調(diào)用漸變函數(shù)DrawGradient(dc.GetSafeHdc(),Nowrect,m_ForeColor,m_BkColor,1);dc.Ellipse(&Nowrect);InvalidateMyRect();/刷新工具區(qū)CDialog:OnLButtonUp(nFlags,point);voidCDrawGra

20、phicsDlg:OnMouseMove(UINTnFlags,CPointpoint)/TODO:Addyourmessagehandlercodehereand/orcalldefaultif(m_IsPressed&&point.x>205)/如果鼠標(biāo)移動(dòng)位置到達(dá)畫板區(qū)CRectrect;m_Graphics.GetClientRect(&rect);m_Graphics.ClientToScreen(&rect);ClipCursor(rect);/限定光標(biāo)在指定矩形CClientDCdc(this);if(m_IsPressed&&

21、;IsDlgButtonChecked(IDC_RADIO_SELF)/如果選擇了涂鴉CPenpen(m_nPenStyle,m_nWidth,m_ForeColor);/創(chuàng)建畫筆dc.SelectObject(&pen);/選入畫筆dc.MoveTo(m_pOld);dc.LineTo(point);/繪制軌跡m_pOld=point;/將當(dāng)前點(diǎn)設(shè)置為舊點(diǎn)elseif(m_IsPressed&&IsDlgButtonChecked(IDC_RADIO_LINE)/如果選擇了直線dc.SetROP2(R2_NOT);/逆轉(zhuǎn)當(dāng)前屏幕顏色來畫線的繪圖方式dc.MoveTo(

22、m_PointOrigin);dc.LineTo(m_pOld);/擦去上一次的線dc.MoveTo(m_PointOrigin);dc.LineTo(point);/繪制這一次的臨時(shí)線m_pOld=point;elseif(m_IsPressed&&IsDlgButtonChecked(IDC_RADIO_RECT)/如果選擇了矩形dc.SetROP2(R2_NOT);CPenpen(PS_DOT,1,m_ForeColor);dc.SelectObject(&pen);dc.SelectObject(GetStockObject(HOLLOW_BRUSH);CRec

23、tOldrect(m_PointOrigin,m_pOld);dc.Rectangle(&Oldrect);CRectNowrect(m_PointOrigin,point);dc.Rectangle(&Nowrect);m_pOld=point;pen.DeleteObject();elseif(m_IsPressed&&IsDlgButtonChecked(IDC_RADIO_ROUND)/如果選擇了圓CClientDCdc(this);dc.SetROP2(R2_NOT);CPenpen(PS_DOT,1,m_ForeColor);dc.SelectObj

24、ect(&pen);dc.SelectObject(GetStockObject(HOLLOW_BRUSH);CRectOldrect(m_PointOrigin,m_pOld);dc.Ellipse(&Oldrect);CRectNowrect(m_PointOrigin,point);dc.Ellipse(&Nowrect);m_pOld=point;pen.DeleteObject();CDialog:OnMouseMove(nFlags,point);11、為背景色、前景色、無填充、實(shí)線、虛線、邊框、清空畫板按鈕添加按鈕單擊消息，響應(yīng)函數(shù)如下：voidCDraw

25、GraphicsDlg:OnButtonBkcolor()/TODO:AddyourcontrolnotificationhandlercodehereCColorDialogcdg;if(cdg.DoModal()=IDOK)/調(diào)用顏色對(duì)話框m_BkColor=cdg.GetColor();/更改背景色m_BkCButton.SetDrawColor(m_BkColor,TRUE);/更改背景色按鈕顏色I(xiàn)nvalidateMyRect();/刷新工具區(qū)voidCDrawGraphicsDlg:OnButtonForecolor()/TODO:Addyourcontrolnotificatio

26、nhandlercodehereCColorDialogcdg;if(cdg.DoModal()=IDOK)m_ForeColor=cdg.GetColor();m_ForeCButton.SetDrawColor(m_ForeColor,TRUE);InvalidateMyRect();voidCDrawGraphicsDlg:OnRadioNull()/TODO:Addyourcontrolnotificationhandlercodehereif(!IsDlgButtonChecked(IDC_CHECK_BORDER)/無填充時(shí)不能也無邊框CButton*cb=(CButton*)Ge

27、tDlgItem(IDC_CHECK_BORDER);cb->SetCheck(1);voidCDrawGraphicsDlg:OnRadioSloidline()/TODO:AddyourcontrolnotificationhandlercodehereCStringstr9="1px","2px","3px","4px","5px","6px","8px","10px","12px"m_ComboLine

28、Value.ResetContent();for(inti=0;i<9;i+)m_ComboLineValue.AddString(stri);m_ComboLineValue.SetCurSel(3);m_nWidth=4;m_nPenStyle=PS_SOLID;InvalidateMyRect();voidCDrawGraphicsDlg:OnRadioDottedline()/TODO:Addyourcontrolnotificationhandlercodeherefor(inti=11;i>0;i-)m_ComboLineValue.DeleteString(i);m_

29、ComboLineValue.SetCurSel(0);m_nWidth=1;m_nPenStyle=PS_DOT;InvalidateMyRect();voidCDrawGraphicsDlg:OnCheckBorder()/TODO:Addyourcontrolnotificationhandlercodehereif(IsDlgButtonChecked(IDC_CHECK_BORDER)m_nPenStyle=PS_SOLID;elsem_nPenStyle=PS_NULL;if(IsDlgButtonChecked(IDC_RADIO_NULL)/既不能無邊框也不能無填充CButto

30、n*cb=(CButton*)GetDlgItem(IDC_CHECK_BORDER);cb->SetCheck(1);voidCDrawGraphicsDlg:OnRadioClear()/TODO:AddyourcontrolnotificationhandlercodehereInvalidate(TRUE);12、為選擇畫筆寬度的下拉列表添加CBN_SELCHAGE消息，消息處理函數(shù)如下：voidCDrawGraphicsDlg:OnRadioSloidline()/TODO:AddyourcontrolnotificationhandlercodehereCStringstr9

31、="1px","2px","3px","4px","5px","6px","8px","10px","12px"m_ComboLineValue.ResetContent();for(inti=0;i<9;i+)m_ComboLineValue.AddString(stri);m_ComboLineValue.SetCurSel(3);m_nWidth=4;m_nPenStyle=PS_SOLID;InvalidateMyRect();13、為CDrawGraphicsDlg類添加如下的兩個(gè)自定義函數(shù)InvalidateMyRect以及DrawGradient，分別用來刷新工具區(qū)和繪制漸變：voidCDrawGraphicsDlg:InvalidateMyRect()/將工具區(qū)部分刷新CRectinva