VC 6.0 下MFC基于对话框 绘制图形.doc

附录表1、 具体步骤： 1、选择菜单栏的“新建”，选择MFC项目名为DrawGraphics，并设置为基于对话框的项目，如图-1、图-2所示； 图-1 图-22、 按下键盘上的Ctrl+W键，调出类向导，选择“Add Class”，并点击“New”添加一个颜色按钮类CColorButton，继承自CButton类，如图-3所示： 图-3 3、在CColorButton中添加如下成员变量：COLORREF color;/按钮颜色CPoint arrays4;/按钮顶点坐标BOOL IsShow; /是否显示按钮BOOL IsPressed; /按钮是否被按下 4、右击CColorButton类，选择Add Virtul function ，重写其DraItem函数，如图-4，图-5所示： 图-4 图-55、 为其Drawitem函数中添加如下代码： CRect rect;GetClientRect(rect);CDC dc;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.bottom);/设置背景透明dc.SetBkMode(TRANSPARENT);if (IsShow)/创建一个位图画刷CBrush brush(color);dc.SelectObject(&brush);CPen pen(PS_NULL,1,color);dc.SelectObject(&pen);dc.Rectangle(rect);if(IsPressed)CPen pen(PS_DASHDOTDOT,3,RGB(0,0,0);dc.SelectObject(&pen);dc.MoveTo(arrays0);for(int i=1;i4;i+)dc.LineTo(arraysi);dc.LineTo(arrays0);elseCPen pen(PS_DASHDOTDOT,2,color);dc.SelectObject(&pen);dc.MoveTo(arrays0);for(int i=1;icolor = m_color; this-IsShow=IsShow;7、 为CColorButton添加WM_LBUTTONDOWN和WM_LBUTTONUP消息，其消息处理函数如下：void CColorButton:OnLButtonDown(UINT nFlags, CPoint point) / TODO: Add your message handler code here and/or call defaultIsPressed = true; CButton:OnLButtonDown(nFlags, point);void CColorButton:OnLButtonUp(UINT nFlags, CPoint point) / TODO: Add your message handler code here and/or call defaultIsPressed = false; CButton:OnLButtonUp(nFlags, point);8、 为DrawGraphics项目的中的对话框资源拖拽如下控件，如图-6所示，并按表-1设置其相关ID； 图-6ID作用及类别IDC_RADIO_RECT矩形单选按钮IDC_RADIO_ROUND圆形单选按钮IDC_RADIO_LINE直线单选按钮IDC_RADIO_SELF涂鸦单选按钮IDC_RADIO_SLOIDLINE实线单选按钮IDC_RADIO_DOTTEDLINE虚线单选按钮IDC_COMBO_LINEVALUE线条粗细下拉列表IDC_STATIC_LINEEXAMPLE显示线条粗细的Picture控件IDC_CHECK_BORDER是否有边界复选框IDC_RADIO_SOLID填充单选按钮IDC_RADIO_GRADIENT渐变单选按钮IDC_RADIO_NULL无填充单选按钮IDC_BUTTON_FORECOLOR前景色按钮IDC_BUTTON_BKCOLOR背景色按钮IDC_RADIO_PEN画笔单选按钮IDC_RADIO_CLEAR清空画板单选按钮IDC_STATIC_GRAPHICS画板区（Picture控件） 表-19、 打开类向导，按图-7所示，为相关控件添加关联成员：10、在CDrawGraphicsDlg类的OninitDialog函数中添加初始化代码： BOOL CDrawGraphicsDlg:OnInitDialog()/*.省略无关代码. .*/ TODO: Add extra initialization here CButton *cb; /设置相关按钮的默认选中状态 cb=(CButton *)GetDlgItem(IDC_RADIO_RECT); cb-SetCheck(1); cb=(CButton *)GetDlgItem(IDC_RADIO_SLOIDLINE); cb-SetCheck(1); 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-SetCheck(1); m_ComboLineValue.SetCurSel(3); m_ForeColor=RGB(255,0,0); m_BkColor=RGB(0,0,255); m_ForeCButton.SetDrawColor(m_ForeColor,TRUE); /设置前背景色按钮的颜色 m_BkCButton.SetDrawColor(m_BkColor,TRUE); m_IsPressed=FALSE; m_nWidth=4; m_nPenStyle=PS_SOLID; return TRUE; / return TRUE unless you set the focus to a control10、 为CDrawGraphicsDlg添加WM_LBUTTONDOWN和WM_LBUTTONUP，WM_MOUSEMOVE消息，其消息处理函数如下：void CDrawGraphicsDlg:OnLButtonDown(UINT nFlags, CPoint point) / TODO: Add your message handler code here and/or call defaultm_IsPressed=TRUE;SetCursor(m_Hcursor);if (IsDlgButtonChecked(IDC_RADIO_SELF) m_pOld=point;else if (IsDlgButtonChecked(IDC_RADIO_LINE)m_pOld=point;m_PointOrigin=point;else if (IsDlgButtonChecked(IDC_RADIO_RECT)m_pOld=point;m_PointOrigin=point;else if (IsDlgButtonChecked(IDC_RADIO_ROUND)m_pOld=point;m_PointOrigin=point;CDialog:OnLButtonDown(nFlags, point);void CDrawGraphicsDlg:OnLButtonUp(UINT nFlags, CPoint point) / TODO: Add your message handler code here and/or call default m_IsPressed=FALSE;ClipCursor(NULL); /解除鼠标的限定CClientDC dc(this);CPen pen(m_nPenStyle,m_nWidth,m_ForeColor);dc.SelectObject(&pen); if (IsDlgButtonChecked(IDC_RADIO_LINE) /选择的为画直线 dc.SetROP2(R2_NOT); /逆转当前屏幕颜色来画线的绘图方式dc.MoveTo(m_PointOrigin);dc.LineTo(m_pOld);/擦去上一次的临时线dc.SetROP2(R2_COPYPEN);/缺省绘图模式，像素为画笔颜色dc.MoveTo(m_PointOrigin);dc.LineTo(point);/绘制固定线 else if (IsDlgButtonChecked(IDC_RADIO_RECT) /选择的为画矩形 dc.SelectObject(GetStockObject(NULL_BRUSH);/选择空话刷 dc.SetROP2(R2_NOT); CRect Oldrect(m_PointOrigin,m_pOld); dc.Rectangle(&Oldrect); /清除之前的矩形绘图 dc.SetROP2(R2_COPYPEN); CBrush brush(m_BkColor); dc.SelectObject(&brush); /画这次的矩形 if (IsDlgButtonChecked(IDC_RADIO_NULL) /如果选择无填充的话，使用空画刷 dc.SelectObject(GetStockObject(NULL_BRUSH); CRect Nowrect(m_PointOrigin,point); dc.Rectangle(&Nowrect); if (IsDlgButtonChecked(IDC_RADIO_GRADIENT)/如果选择渐变的话，调用渐变函数 DrawGradient(dc.GetSafeHdc(),Nowrect,m_ForeColor,m_BkColor,1); else if(IsDlgButtonChecked(IDC_RADIO_ROUND)/如果选择绘制椭圆 dc.SelectObject(GetStockObject(NULL_BRUSH); dc.SetROP2(R2_NOT); CRect Oldrect(m_PointOrigin,m_pOld); dc.Ellipse(&Oldrect); dc.SetROP2(R2_COPYPEN); CBrush brush(m_BkColor); dc.SelectObject(&brush); if (IsDlgButtonChecked(IDC_RADIO_NULL) dc.SelectObject(GetStockObject(NULL_BRUSH); CRect Nowrect(m_PointOrigin,point); if (IsDlgButtonChecked(IDC_RADIO_GRADIENT)/如果选择渐变的话，调用渐变函数 DrawGradient(dc.GetSafeHdc(),Nowrect,m_ForeColor,m_BkColor,1); dc.Ellipse(&Nowrect); InvalidateMyRect();/刷新工具区CDialog:OnLButtonUp(nFlags, point);void CDrawGraphicsDlg:OnMouseMove(UINT nFlags, CPoint point) / TODO: Add your message handler code here and/or call defaultif (m_IsPressed&point.x205)/如果鼠标移动位置到达画板区CRect rect;m_Graphics.GetClientRect(&rect);m_Graphics.ClientToScreen(&rect); ClipCursor(rect);/限定光标在指定矩形CClientDC dc(this);if (m_IsPressed&IsDlgButtonChecked(IDC_RADIO_SELF)/如果选择了涂鸦CPen pen(m_nPenStyle,m_nWidth,m_ForeColor); /创建画笔dc.SelectObject(&pen); /选入画笔dc.MoveTo(m_pOld);dc.LineTo(point);/绘制轨迹m_pOld=point;/将当前点设置为旧点 else if(m_IsPressed&IsDlgButtonChecked(IDC_RADIO_LINE)/如果选择了直线dc.SetROP2(R2_NOT);/逆转当前屏幕颜色来画线的绘图方式dc.MoveTo(m_PointOrigin);dc.LineTo(m_pOld); /擦去上一次的线 dc.MoveTo(m_PointOrigin);dc.LineTo(point);/绘制这一次的临时线m_pOld=point; else if(m_IsPressed&IsDlgButtonChecked(IDC_RADIO_RECT)/如果选择了矩形 dc.SetROP2(R2_NOT); CPen pen(PS_DOT,1,m_ForeColor); dc.SelectObject(&pen); dc.SelectObject(GetStockObject(HOLLOW_BRUSH); CRect Oldrect(m_PointOrigin,m_pOld); dc.Rectangle(&Oldrect); CRect Nowrect(m_PointOrigin,point); dc.Rectangle(&Nowrect); m_pOld=point; pen.DeleteObject(); else if (m_IsPressed&IsDlgButtonChecked(IDC_RADIO_ROUND)/如果选择了圆 CClientDC dc(this); dc.SetROP2(R2_NOT); CPen pen(PS_DOT,1,m_ForeColor); dc.SelectObject(&pen); dc.SelectObject(GetStockObject(HOLLOW_BRUSH); CRect Oldrect(m_PointOrigin,m_pOld); dc.Ellipse(&Oldrect); CRect Nowrect(m_PointOrigin,point); dc.Ellipse(&Nowrect); m_pOld=point; pen.DeleteObject(); CDialog:OnMouseMove(nFlags, point);11、 为背景色、前景色、无填充、实线、虚线、边框、清空画板按钮添加按钮单击消息，响应函数如下：void CDrawGraphicsDlg:OnButtonBkcolor() / TODO: Add your control notification handler code hereCColorDialog cdg;if (cdg.DoModal()=IDOK) /调用颜色对话框m_BkColor=cdg.GetColor(); /更改背景色m_BkCButton.SetDrawColor(m_BkColor,TRUE);/更改背景色按钮颜色InvalidateMyRect(); /刷新工具区void CDrawGraphicsDlg:OnButtonForecolor() / TODO: Add your control notification handler code hereCColorDialog cdg;if (cdg.DoModal()=IDOK)m_ForeColor=cdg.GetColor();m_ForeCButton.SetDrawColor(m_ForeColor,TRUE);InvalidateMyRect();void CDrawGraphicsDlg:OnRadioNull() / TODO: Add your control notification handler code hereif (!IsDlgButtonChecked(IDC_CHECK_BORDER) /无填充时不能也无边框CButton *cb=(CButton *)GetDlgItem(IDC_CHECK_BORDER);cb-SetCheck(1);void CDrawGraphicsDlg:OnRadioSloidline() / TODO: Add your control notification handler code hereCString str9=1px,2px,3px,4px,5px,6px,8px,10px,12px;m_ComboLineValue.ResetContent();for (int i=0;i0;i-) m_ComboLineValue.DeleteString(i);m_ComboLineValue.SetCurSel(0); m_nWidth=1;m_nPenStyle=PS_DOT;InvalidateMyRect(); void CDrawGraphicsDlg:OnCheckBorder() / TODO: Add your control notification handler code hereif (IsDlgButtonChecked(IDC_CHECK_BORDER) m_nPenStyle=PS_SOLID;elsem_nPenStyle=PS_NULL;if (IsDlgButtonChecked(IDC_RADIO_NULL) /既不能无边框也不能无填充CButton *cb=(CButton *)GetDlgItem(IDC_CHECK_BORDER); cb-SetCheck(1);void CDrawGraphicsDlg:OnRadioClear() / TODO: Add your control notification handler code hereInvalidate(TRUE);12、 为选择画笔宽度的下拉列表添加CBN_SELCHAGE消息，消息处理函数如下：void CDrawGraphicsDlg:OnRadioSloidline() / TODO: Add your control notification handler code hereCString str9=1px,2px,3px,4px,5px,6px,8px,10px,12px;m_ComboLineValue.ResetContent();for (int i=0;i9;i+)m_ComboLineValue.AddString(stri);m_ComboLineValue.SetCurSel(3);m_nWidth=4;m_nPenStyle=PS_SOLID;InvalidateMyRect();13、 为CDrawGraphicsDlg类添加如下的两个自定义函数InvalidateMyRect以及DrawGradient，分别用来刷新工具区和绘制渐变： void CDrawGraphicsDlg:InvalidateMyRect() /将工具区部分刷新CRect invaRect;invaRect.top=0;invaRect.bottom=500;invaRect.left=0;invaRect.right=205; Inv