C++制作电压表电流表仪表盘（vs2008）

Meter类

Meter.h

 #if !defined(AFX_METER_H__D5802279_6502_4453_BE21_58604877AD39__INCLUDED_)

 #define AFX_METER_H__D5802279_6502_4453_BE21_58604877AD39__INCLUDED_

 #if _MSC_VER > 1000

 #pragma once

 #endif // _MSC_VER > 1000

 // Meter.h : header file

 //

 #ifndef ROUND

 #define ROUND(x) (int)((x) + 0.5 - (double)((x) < 0))

 #endif

 #define BOUNDARY_POINTS 200

 #define TABNUM 6

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

 // CMeter window

 class CMeter : public CStatic

 {

 // Construction

 public:

     CMeter();

 // Attributes

 public:

 // Operations

 public:

 // Overrides

     // ClassWizard generated virtual function overrides

     //{{AFX_VIRTUAL(CMeter)

     protected:

     //}}AFX_VIRTUAL

 // Implementation

 public:

     void SetAngleRange(int nStartAngleDeg, int nEndAngleDeg);

     int m_nTabNum;

     void SetSubTicks(int nSubTicks);

     void SetTicks(int nTicks);

     void DrawValue(CDC *pDC);

     void SetColorTick(BOOL bColorTick = FALSE);

     BOOL m_bColorTick;

     void DrawNode(CDC *pDC);

     COLORREF m_colorTable[];

     void SetValueDecimals(int nDecimals);

     void SetUnits(CString &strUnits);

     CString m_strUnits;

     int m_nValueDecimals;

     void SetScaleDecimals(int nDecimals);

     void SetRange(double dMin, double dMax);

     void SetNeedleColor (COLORREF colorNeedle);

     void UpdateNeedle(double dValue);

     COLORREF m_colorNeedle;

     int m_nScaleDecimals;

     double m_dCurrentValue;

     double m_dMaxValue;

     double m_dMinValue;

     void DrawNeedle(CDC *pDC);

     void ReconstructControl();

     void DrawMeterBackground(CDC *pDC, CRect &rect);

     int m_nStartAngleDeg;    // 仪表盘圆弧起始角度

     int m_nEndAngleDeg;        // 仪表盘圆弧终止角度

     int m_nTicks;            // 刻度数

     int m_nSubTicks;        // 分刻度数

     virtual ~CMeter();

     // Generated message map functions

 protected:

     double m_dLeftAngleRad;

     double m_dRightAngleRad;

     int m_nCenterRadius;

     CRect m_rectCtrl;            // 控件区域

     CRect m_rectValue;            // 显示数值区域

     CRgn m_rgnBoundary;

     CBitmap *m_pBitmapOldBackground ;

     CBitmap m_bitmapBackground ;

     CDC m_dcBackground;

     CPoint m_ptMeterCenter;        // 仪表中心

     CPoint m_pointBoundary[BOUNDARY_POINTS]; // 边界点，用于绘制刻度

     CFont m_font;            // 显示文字字体

     COLORREF m_colorWindow;        // 背景色

     COLORREF m_colorHighlight;

     COLORREF m_colorShadow;

     COLORREF m_colorButton;

     COLORREF m_colorText;        // 显示文本颜色

     int m_nRadiusFrame;            // 仪表盘边框半径

     //{{AFX_MSG(CMeter)

     afx_msg void OnPaint();

     afx_msg void OnSize(UINT nType, int cx, int cy);

     //}}AFX_MSG

     DECLARE_MESSAGE_MAP()

 };

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

 //{{AFX_INSERT_LOCATION}}

 // Microsoft Visual C++ will insert additional declarations immediately before the previous line.

 #endif // !defined(AFX_METER_H__D5802279_6502_4453_BE21_58604877AD39__INCLUDED_)

Meter.cpp

 // Meter.cpp : implementation file

 //

 #include "stdafx.h"

 #include "Meter.h"

 #include "math.h"

 #include "MemDCEx.h"

 #ifdef _DEBUG

 #define new DEBUG_NEW

 #undef THIS_FILE

 static char THIS_FILE[] = __FILE__;

 #endif

 #define PT_NUM 50

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

 // CMeter

 CMeter::CMeter()

 {

     m_nStartAngleDeg = ;

     m_nEndAngleDeg = ;

     m_nTicks = ;

     m_nSubTicks = ;

     m_dMaxValue = 100.0;

     m_dMinValue = 0.0;

     m_dCurrentValue = 00.0;

     m_nScaleDecimals = ;

     m_nValueDecimals = ;

     m_colorNeedle = RGB(, , );

     m_strUnits = _T("(KV)");

     m_bColorTick = FALSE;

     // 颜色表格

     m_colorTable[] = RGB(,,);

     m_colorTable[] = RGB(, ,);

     m_colorTable[] = RGB(,,);

     m_colorTable[] = RGB(,, );

     m_colorTable[] = RGB(, , );

     m_colorTable[] = RGB(, , );

 }

 CMeter::~CMeter()

 {

 }

 BEGIN_MESSAGE_MAP(CMeter, CStatic)

     //{{AFX_MSG_MAP(CMeter)

     ON_WM_PAINT()

     ON_WM_SIZE()

     //}}AFX_MSG_MAP

 END_MESSAGE_MAP()

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

 // CMeter message handlers

 void CMeter::OnPaint()

 {

     CPaintDC dc(this); // device context for painting

     // 获得控件区域

     GetClientRect (&m_rectCtrl);

     CMemDCEx memDC(&dc, &m_rectCtrl);

     // 选取圆盘边框半径

     m_nRadiusFrame = max(m_rectCtrl.Height(), m_rectCtrl.Width())*/;

     // 获得仪表盘中心点

     m_ptMeterCenter = m_rectCtrl.CenterPoint();

     m_ptMeterCenter.y += m_nRadiusFrame/;

     //绘制仪表盘

     if(m_dcBackground.GetSafeHdc()== NULL|| (m_bitmapBackground.m_hObject == NULL))

     {

         m_dcBackground.CreateCompatibleDC(&dc);

         m_bitmapBackground.CreateCompatibleBitmap(&dc, m_rectCtrl.Width(),                                                                                     m_rectCtrl.Height()) ;

         m_pBitmapOldBackground = m_dcBackground.SelectObject(&m_bitmapBackground) ;

         DrawMeterBackground(&m_dcBackground, m_rectCtrl);

     }

     memDC.BitBlt(, , m_rectCtrl.Width(), m_rectCtrl.Height(),

                        &m_dcBackground, , , SRCCOPY) ;

     // 绘制指针

     DrawNeedle(&memDC);

     DrawNode(&memDC);

     DrawValue(&memDC);

     // Do not call CStatic::OnPaint() for painting messages

 }

 void CMeter::DrawMeterBackground(CDC *pDC, CRect &rect)

 {

     int nInnerRadius = m_nRadiusFrame*/;    // 内圆弧半径

     m_nCenterRadius = m_nRadiusFrame/;    // 中心园半径大小

     int nFrame = m_nRadiusFrame/;            // 边框厚度

     double dstepTickDeg = (360.0+m_nStartAngleDeg-m_nEndAngleDeg)/(m_nTicks*m_nSubTicks);    // 刻度步进角度

     int nSubTickR = nInnerRadius+(m_nRadiusFrame-*nFrame-nInnerRadius)/;

     double dDeg = (m_nStartAngleDeg+360.0-m_nEndAngleDeg)/(TABNUM*PT_NUM);

     CRect rectPanel,rectInnerPanel;

     CPen penDraw, *pPenOld;

     CFont *pFontOld;

     CBrush brushFill, *pBrushOld;

     POINT ptStart, ptEnd, ptInnerStart, ptInnerEnd;

     CPoint pointInner[BOUNDARY_POINTS], ptGroup1[PT_NUM*TABNUM+], ptGroup2[PT_NUM*TABNUM+];

     CPoint ptRgn[PT_NUM*+];

     CPoint pttemp;

     CString strtemp;

     double dRadPerDeg;

     double dTickAngleRad;

     double dTemp;

     int nRef = ;

     int nTickAngle;

     int nHeight;    // 字体大小

     double dtempangle;

     // 计算起始角终止角弧度

     dRadPerDeg = 4.0*atan(1.0)/180.0;

     m_dLeftAngleRad = (m_nStartAngleDeg-180.0)*dRadPerDeg;

     m_dRightAngleRad = (m_nEndAngleDeg-360.0)*dRadPerDeg;

     // 计算圆弧起始终止点及区域

     ptStart.x = m_ptMeterCenter.x-(int)(m_nRadiusFrame*cos(m_dLeftAngleRad));

     ptStart.y = m_ptMeterCenter.y+(int)(m_nRadiusFrame*sin(m_dLeftAngleRad));

     ptEnd.x = m_ptMeterCenter.x+(int)(m_nRadiusFrame*cos(-m_dRightAngleRad));

     ptEnd.y = m_ptMeterCenter.y+(int)(m_nRadiusFrame*sin(-m_dRightAngleRad));

     rectPanel.SetRect(m_ptMeterCenter.x-m_nRadiusFrame, m_ptMeterCenter.y-m_nRadiusFrame,

                         m_ptMeterCenter.x+m_nRadiusFrame, m_ptMeterCenter.y+m_nRadiusFrame);

     // 获取点的位置

     for(int i=; i<=PT_NUM*TABNUM; i++)

     {

         ptGroup1[i].x = m_ptMeterCenter.x + (int)((m_nRadiusFrame-nFrame)*cos((m_nStartAngleDeg-i*dDeg)*dRadPerDeg));

         ptGroup1[i].y = m_ptMeterCenter.y - (int)((m_nRadiusFrame-nFrame)*sin((m_nStartAngleDeg-i*dDeg)*dRadPerDeg));

         ptGroup2[i].x = m_ptMeterCenter.x + (int)(m_nRadiusFrame**cos((m_nStartAngleDeg-i*dDeg)*dRadPerDeg)/);

         ptGroup2[i].y = m_ptMeterCenter.y - (int)(m_nRadiusFrame**sin((m_nStartAngleDeg-i*dDeg)*dRadPerDeg)/);

     }

     // 获取系统颜色;

     m_colorWindow    = GetSysColor(COLOR_WINDOW);

     m_colorButton    = GetSysColor(COLOR_BTNFACE);

     m_colorShadow    = GetSysColor(COLOR_BTNSHADOW);

     m_colorHighlight = GetSysColor(COLOR_BTNHIGHLIGHT);

     m_colorText        = GetSysColor(COLOR_BTNTEXT);

     // 临时使用的颜色

     COLORREF colorCaption, cEdge, cMiddle;

     cMiddle = RGB(, , );

     cEdge = RGB(, , );

     // 用按钮色绘制背景

     brushFill.DeleteObject();

     brushFill.CreateSolidBrush(m_colorButton);

     pBrushOld = pDC->SelectObject(&brushFill);

     pDC->Rectangle(rect);

     pDC->SelectObject(pBrushOld);

     // 绘制圆盘边框

     for(int iOnBand=nFrame; iOnBand>; iOnBand--)

     {

         penDraw.DeleteObject();

         colorCaption = RGB((GetRValue(cEdge)-GetRValue(cMiddle))*((float)iOnBand)/nFrame+GetRValue(cMiddle),

             (GetGValue(cEdge)-GetGValue(cMiddle))*((float)iOnBand)/nFrame+GetGValue(cMiddle),

             (GetBValue(cEdge)-GetBValue(cMiddle))*((float)iOnBand)/nFrame+GetBValue(cMiddle));

         penDraw.CreatePen(PS_SOLID, iOnBand*, colorCaption);

         pPenOld = pDC->SelectObject(&penDraw);

         pDC->Arc(&rectPanel, ptEnd, ptStart);

         pDC->SelectObject(pPenOld);

     }

     // 绘制内圈

     ptInnerStart.x = m_ptMeterCenter.x-(int)(nInnerRadius*cos(m_dLeftAngleRad));

     ptInnerStart.y = m_ptMeterCenter.y+(int)(nInnerRadius*sin(m_dLeftAngleRad));

     ptInnerEnd.x = m_ptMeterCenter.x+(int)(nInnerRadius*cos(-m_dRightAngleRad));

     ptInnerEnd.y = m_ptMeterCenter.y+(int)(nInnerRadius*sin(-m_dRightAngleRad));

     rectInnerPanel.SetRect(m_ptMeterCenter.x-nInnerRadius, m_ptMeterCenter.y-nInnerRadius,

                         m_ptMeterCenter.x+nInnerRadius ,m_ptMeterCenter.y+nInnerRadius);

     penDraw.DeleteObject();

     penDraw.CreatePen(PS_SOLID, , RGB(,,));

     pPenOld = pDC->SelectObject(&penDraw);

     pDC->Arc(&rectInnerPanel, ptInnerEnd, ptInnerStart);

     pDC->SelectObject(pPenOld);    

     if(m_bColorTick)

     {

         // 绘制色彩刻度

         for(int i=; i<TABNUM; i++)

         {

             //确定区域

             for(int j=; j<=PT_NUM; j++)

             {

                 ptRgn[j] = ptGroup1[i*PT_NUM+j];

                 ptRgn[*PT_NUM+-j] = ptGroup2[i*PT_NUM+j];

             }

             brushFill.DeleteObject();

             brushFill.CreateSolidBrush(m_colorTable[i]);

             pBrushOld = pDC->SelectObject(&brushFill);

             penDraw.DeleteObject();

             penDraw.CreatePen(PS_SOLID, , m_colorTable[i]);

             pPenOld = pDC->SelectObject(&penDraw);

             pDC->Polygon(ptRgn, *PT_NUM+);

             pDC->SelectObject(pBrushOld);

             pDC->SelectObject(pPenOld);

         }

     }

     // 计算刻度点,避免不能整除引起较大误差*100

     for(nTickAngle=m_nStartAngleDeg*; nTickAngle>=(m_nEndAngleDeg-)*; nTickAngle-=(int)(dstepTickDeg*))

     {

         // 转换成弧度

         dTickAngleRad = (double)nTickAngle/*dRadPerDeg;

         // 确定外圈坐标

         // 确定x坐标

         dTemp = m_ptMeterCenter.x + (m_nRadiusFrame-*nFrame)*cos(dTickAngleRad);

         m_pointBoundary[nRef].x = ROUND(dTemp);

         // 确定y坐标

         dTemp = m_ptMeterCenter.y - (m_nRadiusFrame-*nFrame)*sin(dTickAngleRad);

         m_pointBoundary[nRef].y = ROUND(dTemp);

         // 确定刻度点(主刻度和子刻度)

         //主刻度及文本标注点

         if(nRef%m_nSubTicks == )

         {

             dTemp = m_ptMeterCenter.x + nInnerRadius*cos(dTickAngleRad);

             pointInner[nRef].x = ROUND(dTemp);

             dTemp = m_ptMeterCenter.y - nInnerRadius*sin(dTickAngleRad);

             pointInner[nRef].y = ROUND(dTemp);

         }

         // 子刻度

         else

         {

             dTemp = m_ptMeterCenter.x + nSubTickR*cos(dTickAngleRad);

             pointInner[nRef].x = ROUND(dTemp);

             dTemp = m_ptMeterCenter.y - nSubTickR*sin(dTickAngleRad);

             pointInner[nRef].y = ROUND(dTemp);

         }

         nRef++ ;

     }

     // 多边形区域

     m_rgnBoundary.DeleteObject() ;

     m_rgnBoundary.CreatePolygonRgn(m_pointBoundary, nRef, ALTERNATE);

     m_rectValue.top = m_ptMeterCenter.y + m_nRadiusFrame/;

     m_rectValue.bottom = m_ptMeterCenter.y + m_nRadiusFrame/;

     m_rectValue.left = m_ptMeterCenter.x - m_nRadiusFrame/;

     m_rectValue.right = m_ptMeterCenter.x + m_nRadiusFrame/;

     // 绘制刻度

     penDraw.DeleteObject();

     penDraw.CreatePen(PS_SOLID, , RGB(,,));

     pPenOld = pDC->SelectObject(&penDraw);

     for(int i=; i<nRef; i++)

     {

         pDC->MoveTo(m_pointBoundary[i]);

         pDC->LineTo(pointInner[i]);

     }

     pDC->SelectObject(pPenOld);    

     // 刻度标号

     nHeight = m_nRadiusFrame/;  //字体大小

     m_font.CreateFont(nHeight, , , , ,

                             FALSE, FALSE, , ANSI_CHARSET,

                             OUT_DEFAULT_PRECIS,

                             CLIP_DEFAULT_PRECIS,

                             DEFAULT_QUALITY,

                             DEFAULT_PITCH|FF_SWISS, "Arial");

     pFontOld = pDC->SelectObject(&m_font);

     pDC->SetBkMode(TRANSPARENT);

     for(int i=; i<=m_nTicks; i++)

     {

         dtempangle = m_nStartAngleDeg-i*m_nSubTicks*dstepTickDeg;

         strtemp.Format("%.*lf", m_nScaleDecimals, (m_dMinValue+(m_dMaxValue-m_dMinValue)*i/m_nTicks));

         if(dtempangle>)

         {

             pDC->SetTextAlign(TA_BOTTOM|TA_LEFT);

             pDC->TextOut(pointInner[m_nSubTicks*i].x, pointInner[m_nSubTicks*i].y+nHeight/, strtemp);

         }

         else if(dtempangle>)

         {

             pDC->SetTextAlign(TA_BASELINE|TA_LEFT);

             pDC->TextOut(pointInner[m_nSubTicks*i].x, pointInner[m_nSubTicks*i].y+nHeight/, strtemp);

         }

         else if(dtempangle>)

         {

             pDC->SetTextAlign(TA_BASELINE|TA_LEFT);

             pDC->TextOut(pointInner[m_nSubTicks*i].x, pointInner[m_nSubTicks*i].y+nHeight/, strtemp);

         }

         else if(dtempangle>)

         {

             pDC->SetTextAlign(TA_TOP|TA_LEFT);

             pDC->TextOut(pointInner[m_nSubTicks*i].x-nHeight/, pointInner[m_nSubTicks*i].y-nHeight/, strtemp);

         }

         else if(dtempangle>)

         {

             pDC->SetTextAlign(TA_TOP|TA_CENTER);

             pDC->TextOut(pointInner[m_nSubTicks*i].x, pointInner[m_nSubTicks*i].y, strtemp);

         }

         else if(dtempangle>)

         {

             pDC->SetTextAlign(TA_BOTTOM|TA_RIGHT);

             pDC->TextOut(pointInner[m_nSubTicks*i].x+nHeight/, pointInner[m_nSubTicks*i].y+nHeight, strtemp);

         }

         else if(dtempangle>)

         {

             pDC->SetTextAlign(TA_RIGHT|TA_BASELINE);

             pDC->TextOut(pointInner[m_nSubTicks*i].x, pointInner[m_nSubTicks*i].y+nHeight/, strtemp);

         }

         else if(dtempangle>-)

         {

             pDC->SetTextAlign(TA_RIGHT|TA_BASELINE);

             pDC->TextOut(pointInner[m_nSubTicks*i].x, pointInner[m_nSubTicks*i].y+nHeight/, strtemp);

         }

         else

         {

             pDC->SetTextAlign(TA_RIGHT|TA_BOTTOM);

             pDC->TextOut(pointInner[m_nSubTicks*i].x, pointInner[m_nSubTicks*i].y+nHeight/, strtemp);

         }

     }

     pDC->SelectObject(pFontOld);

 }

 void CMeter::ReconstructControl()

 {

     if ((m_pBitmapOldBackground) &&

           (m_bitmapBackground.GetSafeHandle()) &&

             (m_dcBackground.GetSafeHdc()))

     {

             m_dcBackground.SelectObject(m_pBitmapOldBackground);

             m_dcBackground.DeleteDC() ;

             m_bitmapBackground.DeleteObject();

     }

     Invalidate ();

 }

 void CMeter::OnSize(UINT nType, int cx, int cy)

 {

     CStatic::OnSize(nType, cx, cy);

     // TODO: Add your message handler code here

     ReconstructControl() ;

 }

 void CMeter::DrawNeedle(CDC *pDC)

 {

     int nResult;

     double dRadPerDeg = 4.0*atan(1.0)/180.0;

     double dAngleDeg;

     double dAngleRad ;

     double dTemp ;

     CBrush brushFill, *pBrushOld ;

     CPen penDraw, *pPenOld ;

     CPoint pointNeedle[] ;    // 指针由四边形组成

     // 计算角度并限定指针走的角度

     dAngleDeg = m_nStartAngleDeg-(360.0+m_nStartAngleDeg-m_nEndAngleDeg)

         *(m_dCurrentValue-m_dMinValue)/(m_dMaxValue-m_dMinValue);

     dAngleDeg = min(dAngleDeg, m_nStartAngleDeg);

     dAngleDeg = max(dAngleDeg, m_nEndAngleDeg-360.0);

     dAngleRad = dAngleDeg*dRadPerDeg;

     // 计算三角形底边两个点

     pointNeedle[].x = m_ptMeterCenter.x - (int)(m_nCenterRadius**sin(dAngleRad)/);

     pointNeedle[].y = m_ptMeterCenter.y - (int)(m_nCenterRadius**cos(dAngleRad)/);

     pointNeedle[].x = m_ptMeterCenter.x + (int)(m_nCenterRadius**sin(dAngleRad)/);

     pointNeedle[].y = m_ptMeterCenter.y + (int)(m_nCenterRadius**cos(dAngleRad)/);

     // 计算指针顶部坐标

     dTemp = m_ptMeterCenter.x + m_nRadiusFrame*cos(dAngleRad)*/;

     pointNeedle[].x = ROUND(dTemp);

     dTemp = m_ptMeterCenter.y - m_nRadiusFrame*sin(dAngleRad)*/;

     pointNeedle[].y = ROUND(dTemp);

     // 计算指针尾部坐标

     dTemp = m_ptMeterCenter.x - m_nRadiusFrame*cos(dAngleRad)/;

     pointNeedle[].x = ROUND(dTemp);

     dTemp = m_ptMeterCenter.y + m_nRadiusFrame*sin(dAngleRad)/;

     pointNeedle[].y = ROUND(dTemp);

     pDC->SelectClipRgn(&m_rgnBoundary);

     brushFill.CreateSolidBrush(m_colorNeedle);

     penDraw.CreatePen(PS_SOLID, , m_colorNeedle);

     pPenOld = pDC->SelectObject(&penDraw) ;

     pBrushOld = pDC->SelectObject(&brushFill) ;

     // 绘制指针

     pDC->Polygon(pointNeedle, );

     nResult = pDC->SelectClipRgn(NULL);

     pDC->SelectObject(pPenOld);

     pDC->SelectObject(pBrushOld);

     // 立体感处理

     if(dAngleDeg>)

     {

         penDraw.DeleteObject();

         penDraw.CreatePen(PS_SOLID, , m_colorShadow);

         pPenOld = pDC->SelectObject(&penDraw);

         pDC->MoveTo(pointNeedle[]);

         pDC->LineTo(pointNeedle[]);

         pDC->LineTo(pointNeedle[]);

         pDC->SelectObject(pPenOld);

         penDraw.DeleteObject();

         penDraw.CreatePen(PS_SOLID, , m_colorHighlight);

         pPenOld = pDC->SelectObject(&penDraw);

         pDC->MoveTo(pointNeedle[]);

         pDC->LineTo(pointNeedle[]);

         pDC->LineTo(pointNeedle[]);

         pDC->SelectObject(pPenOld);

     }

     else

     {

         penDraw.DeleteObject();

         penDraw.CreatePen(PS_SOLID, , m_colorShadow);

         pPenOld = pDC->SelectObject(&penDraw);

         pDC->MoveTo(pointNeedle[]);

         pDC->LineTo(pointNeedle[]);

         pDC->LineTo(pointNeedle[]);

         pDC->SelectObject(pPenOld);

         penDraw.DeleteObject();

         penDraw.CreatePen(PS_SOLID, , m_colorHighlight);

         pPenOld = pDC->SelectObject(&penDraw);

         pDC->MoveTo(pointNeedle[]);

         pDC->LineTo(pointNeedle[]);

         pDC->LineTo(pointNeedle[]);

         pDC->SelectObject(pPenOld);

     }

 }

 void CMeter::UpdateNeedle(double dValue)

 {

     m_dCurrentValue = dValue;

     Invalidate();

 }

 void CMeter::SetNeedleColor(COLORREF colorNeedle)

 {

     m_colorNeedle = colorNeedle ;

     ReconstructControl() ;

 }

 void CMeter::SetRange(double dMin, double dMax)

 {

     m_dMaxValue = dMax ;

     m_dMinValue = dMin ;

     ReconstructControl() ;

 }

 void CMeter::SetScaleDecimals(int nDecimals)

 {

     m_nScaleDecimals = nDecimals ;

     ReconstructControl() ;

 }

 void CMeter::SetUnits(CString &strUnits)

 {

     m_strUnits = strUnits ;

     ReconstructControl() ;

 }

 void CMeter::SetValueDecimals(int nDecimals)

 {

     m_nValueDecimals = nDecimals ;

     ReconstructControl() ;

 }

 void CMeter::DrawNode(CDC *pDC)

 {

     CPen penDraw, *pPenOld;

     COLORREF cEdge, cMiddle, cNode;

     cMiddle = RGB(, , );

     cEdge = RGB(, , );

     for(int i=m_nCenterRadius*/; i>=; i--)

     {

         cNode = RGB((GetRValue(cEdge)-GetRValue(cMiddle))*((float)i)*/(*m_nCenterRadius)+GetRValue(cMiddle),

             (GetGValue(cEdge)-GetGValue(cMiddle))*((float)i)*/(*m_nCenterRadius)+GetGValue(cMiddle),

             (GetBValue(cEdge)-GetBValue(cMiddle))*((float)i)*/(*m_nCenterRadius)+GetBValue(cMiddle));

         penDraw.DeleteObject();

         penDraw.CreatePen(PS_SOLID, , cNode);

         pPenOld = pDC->SelectObject(&penDraw);

         pDC->Arc(m_ptMeterCenter.x-i, m_ptMeterCenter.y-i,m_ptMeterCenter.x+i,m_ptMeterCenter.y+i,

             m_ptMeterCenter.x-i,m_ptMeterCenter.y,m_ptMeterCenter.x-i,m_ptMeterCenter.y);

         pDC->SelectObject(pPenOld);

     }

 }

 void CMeter::SetColorTick(BOOL bColorTick)

 {

     m_bColorTick = bColorTick;

     ReconstructControl();

 }

 void CMeter::DrawValue(CDC *pDC)

 {

     int nHeight;

     CPoint pttemp;

     CString strtemp;

     CFont *pFontOld;

     //  数值显示

     nHeight = m_nRadiusFrame/;

     pttemp = m_rectValue.CenterPoint();

     strtemp.Format("%.*lf", m_nValueDecimals, m_dCurrentValue);

     m_font.DeleteObject() ;

     m_font.CreateFont (nHeight, , , , ,

                         FALSE, FALSE, , ANSI_CHARSET,

                         OUT_DEFAULT_PRECIS,

                         CLIP_DEFAULT_PRECIS,

                         DEFAULT_QUALITY,

                         DEFAULT_PITCH|FF_SWISS, "Arial") ;

     pFontOld = pDC->SelectObject(&m_font);

     pDC->SetBkColor(m_colorButton);

     pDC->SetTextAlign(TA_TOP|TA_CENTER);

     pDC->TextOut(pttemp.x, pttemp.y, m_strUnits);

     pDC->TextOut(pttemp.x, pttemp.y+nHeight, strtemp);

     // 恢复字体和背景色

     pDC->SelectObject(pFontOld);

     pDC->SetBkColor(m_colorWindow);

 }

 void CMeter::SetTicks(int nTicks)

 {

     m_nTicks = nTicks;

     ReconstructControl();

 }

 void CMeter::SetSubTicks(int nSubTicks)

 {

     m_nSubTicks = nSubTicks;

     ReconstructControl();

 }

 void CMeter::SetAngleRange(int nStartAngleDeg, int nEndAngleDeg)

 {

     m_nStartAngleDeg = nStartAngleDeg;

     m_nEndAngleDeg = nEndAngleDeg;

     ReconstructControl();

 }

MemDCEx.h

 #ifndef _MEMDC_H_

 #define _MEMDC_H_

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

 // CMemDC - memory DC

 //

 // Author: Keith Rule

 // Email:  keithr@europa.com

 // Copyright 1996-1999, Keith Rule

 //

 // You may freely use or modify this code provided this

 // Copyright is included in all derived versions.

 //

 // History - 10/3/97 Fixed scrolling bug.

 //                   Added print support. - KR

 //

 //           11/3/99 Fixed most common complaint. Added

 //                   background color fill. - KR

 //

 //           11/3/99 Added support for mapping modes other than

 //                   MM_TEXT as suggested by Lee Sang Hun. - KR

 //

 // Modified by Mark Malburg  March 12, 1998

 // Email:  mcmalburg@sytech.cummins.com

 //  (added new construction and clipboard handling)

 //

 //    Construction :

 //    |

 //    |    CMemDC pDC (dc, &drawRect, toMemDC) ;

 //    |

 //    |    where:

 //    |        "dc"        - pointer to the CDC that is an argument to OnDraw

 //    |        "drawRect"    - pointer to the rectangle to draw in

 //    |        "boolToMemory"    - TRUE: to the client, FALSE: to clipboard or printer

 //    |

 //

 // This class implements a memory Device Context which allows

 // flicker free drawing.

 class CMemDCEx : public CDC

 {

 private:

     CBitmap        m_bitmap;        // Offscreen bitmap

     CBitmap*    m_oldBitmap;    // bitmap originally found in CMemDC

     CDC*        m_pDC;            // Saves CDC passed in constructor

     CRect        m_rect;            // Rectangle of drawing area.

     BOOL        m_bMemDC;        // TRUE if CDC really is a Memory DC.

 public:

     CMemDCEx(CDC* pDC, const CRect* pRect = NULL, bool boolToMemory = TRUE) : CDC()

     {

         ASSERT(pDC != NULL); 

         // Some initialization

         m_pDC = pDC;

         m_oldBitmap = NULL;

         if (boolToMemory)

             m_bMemDC = !pDC->IsPrinting();

         else

             m_bMemDC = FALSE ;

         // Get the rectangle to draw

         if (pRect == NULL)

         {

             pDC->GetClipBox(&m_rect);

         }

         else

         {

             m_rect = *pRect;

         }

         if (m_bMemDC)

         {

             // Create a Memory DC

             CreateCompatibleDC(pDC);

             pDC->LPtoDP(&m_rect);

             m_bitmap.CreateCompatibleBitmap(pDC, m_rect.Width(), m_rect.Height());

             m_oldBitmap = SelectObject(&m_bitmap);

             SetMapMode(pDC->GetMapMode());

             pDC->DPtoLP(&m_rect);

             SetWindowOrg(m_rect.left, m_rect.top);

         }

         else

         {

             // Make a copy of the relevent parts of the current DC for printing

             if (pDC->IsPrinting())

                 m_bPrinting = pDC->m_bPrinting;

             m_hDC       = pDC->m_hDC;

             m_hAttribDC = pDC->m_hAttribDC;

         }

         // Fill background

         FillSolidRect(m_rect, pDC->GetBkColor());

     }

     ~CMemDCEx()

     {

         if (m_bMemDC)

         {

             // Copy the offscreen bitmap onto the screen.

             m_pDC->BitBlt(m_rect.left, m_rect.top, m_rect.Width(), m_rect.Height(),

                             this, m_rect.left, m_rect.top, SRCCOPY);            

             //Swap back the original bitmap.

             SelectObject(m_oldBitmap);

         }

         else

         {

             // All we need to do is replace the DC with an illegal value,

             // this keeps us from accidently deleting the handles associated with

             // the CDC that was passed to the constructor.

             m_hDC = m_hAttribDC = NULL;

         }

     }

     // Allow usage as a pointer

     CMemDCEx* operator->()

     {

         return this;

     }    

     // Allow usage as a pointer

     operator CMemDCEx*()

     {

         return this;

     }

 };

 #endif

完整工程下载：https://download.csdn.net/download/qq_23565865/10715458

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