使用GDI+画仪表表盘

 
 

  
  

   
   

    
    

     
     [cpp] 
     
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Gdiplus::Bitmap * CSlaveView::GetPumpImage( float fMin,float fMax,float fValue,CString strUnit )  
{  
    const float PI=3.141592653;  
    if(fMin>fValue)  
    {  
        fMin=fValue;  
    }  
    if(fValue>fMax)  
    {  
        fMax=fValue;  
    }  
    int nWidth,nHeight;  
    nWidth=nHeight=200;  
    Gdiplus::Rect rect(0,0,nWidth,nHeight);  
    int nTable=5;       //  大格  
    int nScale=5;       //  每小段里面的小格  
    //  每段颜色  
    Gdiplus::Color TableColor[]=  
    {  
        Gdiplus::Color::Green,  
        Gdiplus::Color::Blue,  
        Gdiplus::Color::Cyan,  
        Gdiplus::Color::Yellow,  
        Gdiplus::Color::Red  
    };  
    //  张开的弧度  
    float fRadian=60;  
    //  同心圆半径  
    int nRadius[]=  
    {  
        200,  
        160,  
        90  
    };  
    //  圆心  
    Gdiplus::Point ptCenter(nWidth/2,nHeight+20);  
    //  刻度线长度  
    int nLongScal=15;  
    int nShortScal=10;  
    //  背景色  
    Gdiplus::Color bkColor=Gdiplus::Color::SkyBlue;  
    //  刻度字体,大小,颜色  
    Gdiplus::Color ScaleColor=Gdiplus::Color::Blue;  
    Gdiplus::REAL   ScaleSize=10;  
    CString ScaleFont=_T("Times New Roman");  
  
    Gdiplus::Bitmap *pImage=new Gdiplus::Bitmap(nWidth,nHeight);  
    Graphics *pGraph=Graphics::FromImage(pImage);  
    Gdiplus::StringFormat format;  
    //  消除锯齿  
    format.SetAlignment( StringAlignmentCenter);  
    format.SetLineAlignment(StringAlignmentCenter);  
    pGraph->SetTextRenderingHint(TextRenderingHintAntiAlias);  
    pGraph->Clear(Gdiplus::Color::Transparent);  
    Gdiplus::Color LineColor=Gdiplus::Color::Chocolate;  
    Gdiplus::Pen LinePen(LineColor,1);  
    //  画三段弧  
    rect=Gdiplus::Rect(ptCenter.X-nRadius[0],ptCenter.Y-nRadius[0],2*nRadius[0],2*nRadius[0]);  
    pGraph->DrawArc(&LinePen,rect,180+(90-fRadian/2),fRadian);  
    rect=Gdiplus::Rect(ptCenter.X-nRadius[1],ptCenter.Y-nRadius[1],2*nRadius[1],2*nRadius[1]);  
    pGraph->DrawArc(&LinePen,rect,180+(90-fRadian/2),fRadian);  
    rect=Gdiplus::Rect(ptCenter.X-nRadius[2],ptCenter.Y-nRadius[2],2*nRadius[2],2*nRadius[2]);  
    pGraph->DrawArc(&LinePen,rect,180+(90-fRadian/2),fRadian);  
      
    //  标刻度  
      
    //  分段  
    for(int i=0;iDrawString(  
                    str,  
                    -1,  
                    &Gdiplus::Font(ScaleFont,ScaleSize),  
                    textrc,  
                    &format,  
                    &Gdiplus::SolidBrush(ScaleColor)  
                    );  
                Gdiplus::Point p2,p3;  
                int nGap=5;  
                p3.X=ptCenter.X+(nRadius[0]+0)*cos(f0);  
                p3.Y=ptCenter.Y-(nRadius[0]+0)*sin(f0);  
                p2.X=ptCenter.X+(nRadius[0]-nGap)*cos(f0);  
                p2.Y=ptCenter.Y-(nRadius[0]-nGap)*sin(f0);  
                pGraph->DrawLine(&LinePen,p2,p3);  
            }  
              
        }  
        else  
        {  
            p0.X=ptCenter.X+(nRadius[1]+nShortScal)*cos(f0);  
            p0.Y=ptCenter.Y-(nRadius[1]+nShortScal)*sin(f0);  
        }  
  
        pGraph->DrawLine(&LinePen,p0,p1);  
    }  
  
    CString strDataFont=_T("Times New Roman");  
    int DataSize=15;  
    Gdiplus::Color DataColor=Gdiplus::Color::Red;  
  
    //  单位  
    Gdiplus::RectF UnitRc;  
    CSize size=CGraphCurveView::GetOutPutTextSize(pGraph,strUnit,strDataFont,DataSize);  
    UnitRc.X=ptCenter.X-size.cx/2;  
    UnitRc.Y=ptCenter.Y-(nRadius[0]-nRadius[1]+nRadius[2]+size.cy/2);  
    UnitRc.Width=size.cx;  
    UnitRc.Height=size.cy;  
    pGraph->DrawString(  
        strUnit,  
        -1,  
        &Gdiplus::Font(strDataFont,DataSize),  
        UnitRc,  
        &format,  
        &Gdiplus::SolidBrush(DataColor)  
        );  
  
    //  数据  
    CString strData;  
    strData.Format(_T("%.0f"),fValue);  
    size=CGraphCurveView::GetOutPutTextSize(pGraph,strData,strDataFont,DataSize);  
    Gdiplus::RectF DataRc;  
    DataRc.X=ptCenter.X-size.cx/2;  
    DataRc.Y=ptCenter.Y-(nRadius[2]-nLongScal);  
    DataRc.Width=size.cx;  
    DataRc.Height=size.cy;  
    pGraph->DrawString(  
        strData,  
        -1,  
        &Gdiplus::Font(strDataFont,DataSize),  
        DataRc,  
        &format,  
        &Gdiplus::SolidBrush(DataColor)  
        );  
  
    //  画指针  
    Gdiplus::Pen PointPen(Gdiplus::Color::Green,2);  
    Gdiplus::Point p0,p1;  
    double f0=((180-fRadian)/2+fRadian/(fMax-fMin)*(-fValue+fMax))/180*PI;  
    p0.X=ptCenter.X+(nRadius[2]*cos(f0));  
    p0.Y=ptCenter.Y-(nRadius[2]*sin(f0));  
    p1.X=ptCenter.X+((nRadius[1]+nShortScal/2)*cos(f0));  
    p1.Y=ptCenter.Y-((nRadius[1]+nShortScal/2)*sin(f0));  
    pGraph->DrawLine(&PointPen,p0,p1);  
  
    delete pGraph;  
    return pImage;  
}  
  
  
效果: