c# 实现圆形的进度条(ProgressBar)

2023-07-04 23:15:03 80

在我们实际的工作中可能经常使用到圆形的进度条，但是这是怎么实现的呢？其实这只不过是修改了一下ProgressBar的模板，我们在下面的代码中我们将ProgressBar的Value值绑定到Border的Background上面，并且使用了一个ValueToProcessConverter的转换器进行相应地转换，这里重点介绍一下这个转换器

下面介绍这部分的源码，并做简要的分析：

首先，获取ProgressBar.Value，然后再获取ConverterParameter=250这个值，通过这两个值就能确定画的圆环的大小和ProgressBar显示的值，然后我们再调用DrawBrush(arg,100,radius,radius,Thickness)这个函数来进行绘制，具体代码如下：

privateBrushDrawBrush(doublevalue,doublemaxValue,doubleradiusX,doubleradiusY,doublethickness)
        {
            DrawingGroupdrawingGroup=newDrawingGroup();
            DrawingContextdrawingContext=drawingGroup.Open();
            DrawingGeometry(drawingContext,value,maxValue,radiusX,radiusY,thickness);
            DrawingBrushbrush=newDrawingBrush(drawingGroup);
            returnbrush;
        }

这里需要注意的是绝不能直接实例化 DrawingContext；但可以通过某些方法（例如 DrawingGroup.Open 和 DrawingVisual.RenderOpen）获取绘图上下文。我们这里是使用DrawingGroup.Open的方法来进行相应的绘图，然后在里面调用里DrawingGeometry这个函数，在这个函数中开始绘制一些DrawEllipse和DrawGeometry，在这个函数中我们讲解一下FormattedText这个类，使用 FormattedText 对象可以绘制多行文本，且可以单独对该文本中的每个字符设置格式。

privatevoidDrawingGeometry(DrawingContextdrawingContext,doublevalue,doublemaxValue,doubleradiusX,doubleradiusY,doublethickness)
       {
           drawingContext.DrawEllipse(null,newPen(EllipseBrush,thickness),centerPoint,radiusX,radiusY);
           drawingContext.DrawGeometry(NormalBrush,newPen(),GetGeometry(value,maxValue,radiusX,radiusY,thickness));
 
           FormattedTextformatWords=newFormattedText(percentString,CultureInfo.CurrentCulture,FlowDirection.LeftToRight,SuccessRateTypeface,SuccessRateFontSize,NormalBrush);
           PointstartPoint=newPoint(centerPoint.X-formatWords.Width/2,centerPoint.Y-formatWords.Height/2-SuccessRateFontCorrectionValue);
           drawingContext.DrawText(formatWords,startPoint);
 
           drawingContext.Close();
       }

publicclassValueToProcessConverter:IValueConverter
    {
        readonlydoubleThickness=20;
        privatePointcenterPoint;
        privatedoubleradius;
        readonlySolidColorBrushNormalBrush=newSolidColorBrush(Colors.White);
        readonlySolidColorBrushEllipseBrush=newSolidColorBrush(Color.FromRgb(107,132,165));
 
        stringpercentString;
        privatestaticreadonlyTypefaceSuccessRateTypeface;
        privateconstintSuccessRateFontSize=65;
        readonlydoubleSuccessRateFontCorrectionValue=12;
 
        staticValueToProcessConverter()
        {
            SuccessRateTypeface=newTypeface(newFontFamily("MSYH"),newFontStyle(),newFontWeight(),newFontStretch());
        }
        publicValueToProcessConverter()
        {
 
        }
        publicobjectConvert(objectvalue,TypetargetType,objectparameter,System.Globalization.CultureInfoculture)
        {
            if(valueisdouble&&!string.IsNullOrEmpty((string)parameter))
            {
                doublearg=(double)value;
                doublewidth=double.Parse((string)parameter);
                radius=width/2;
                centerPoint=newPoint(radius,radius);
                returnDrawBrush(arg,100,radius,radius,Thickness);
            }
            else
            {
                thrownewArgumentException();
            }
        }
        publicobjectConvertBack(objectvalue,TypetargetType,objectparameter,System.Globalization.CultureInfoculture)
        {
            thrownewNotImplementedException();
        }
 
        ///
        ///根据角度获取坐标
        ///
        ///
        ///
        ///
        ///
        privatePointGetPointByAngel(PointCenterPoint,doubler,doubleangel)
        {
            Pointp=newPoint();
            p.X=Math.Sin(angel*Math.PI/180)*r+CenterPoint.X;
            p.Y=CenterPoint.Y-Math.Cos(angel*Math.PI/180)*r;
            returnp;
        }
 
        ///
        ///根据4个坐标画出扇形
        ///
        ///
        ///
        ///
        ///
        ///
        ///
        ///
        ///
        privateGeometryDrawingArcGeometry(PointbigFirstPoint,PointbigSecondPoint,PointsmallFirstPoint,PointsmallSecondPoint,doublebigRadius,doublesmallRadius,boolisLargeArc)
        {
            PathFigurepathFigure=newPathFigure{IsClosed=true};
            pathFigure.StartPoint=bigFirstPoint;
            pathFigure.Segments.Add(
              newArcSegment
              {
                  Point=bigSecondPoint,
                  IsLargeArc=isLargeArc,
                  Size=newSize(bigRadius,bigRadius),
                  SweepDirection=SweepDirection.Clockwise
              });
            pathFigure.Segments.Add(newLineSegment{Point=smallSecondPoint});
            pathFigure.Segments.Add(
             newArcSegment
             {
                 Point=smallFirstPoint,
                 IsLargeArc=isLargeArc,
                 Size=newSize(smallRadius,smallRadius),
                 SweepDirection=SweepDirection.Counterclockwise
             });
            PathGeometrypathGeometry=newPathGeometry();
            pathGeometry.Figures.Add(pathFigure);
 
            returnpathGeometry;
        }
 
        ///
        ///根据当前值和最大值获取扇形
        ///
        ///
        ///
        ///
        privateGeometryGetGeometry(doublevalue,doublemaxValue,doubleradiusX,doubleradiusY,doublethickness)
        {
            boolisLargeArc=false;
            doublepercent=value/maxValue;
            percentString=string.Format("{0}%",Math.Round(percent*100,2));
            doubleangel=percent*360D;
            if(angel>180)isLargeArc=true;
            doublebigR=radiusX+thickness/2;
            doublesmallR=radiusX-thickness/2;
            Pointfirstpoint=GetPointByAngel(centerPoint,bigR,0);
            Pointsecondpoint=GetPointByAngel(centerPoint,bigR,angel);
            Pointthirdpoint=GetPointByAngel(centerPoint,smallR,0);
            Pointfourpoint=GetPointByAngel(centerPoint,smallR,angel);
            returnDrawingArcGeometry(firstpoint,secondpoint,thirdpoint,fourpoint,bigR,smallR,isLargeArc);
        }
 
        ///
        ///画扇形
        ///
        ///
        ///
        ///
        ///
        ///
        ///
        privatevoidDrawingGeometry(DrawingContextdrawingContext,doublevalue,doublemaxValue,doubleradiusX,doubleradiusY,doublethickness)
        {
            drawingContext.DrawEllipse(null,newPen(EllipseBrush,thickness),centerPoint,radiusX,radiusY);
            drawingContext.DrawGeometry(NormalBrush,newPen(),GetGeometry(value,maxValue,radiusX,radiusY,thickness));
            FormattedTextformatWords=newFormattedText(percentString,CultureInfo.CurrentCulture,FlowDirection.LeftToRight,SuccessRateTypeface,SuccessRateFontSize,NormalBrush);
            PointstartPoint=newPoint(centerPoint.X-formatWords.Width/2,centerPoint.Y-formatWords.Height/2-SuccessRateFontCorrectionValue);
            drawingContext.DrawText(formatWords,startPoint);
            drawingContext.Close();
        }
 
        ///
        ///根据当前值和最大值画出进度条
        ///
        ///
        ///
        ///
        privateBrushDrawBrush(doublevalue,doublemaxValue,doubleradiusX,doubleradiusY,doublethickness)
        {
            DrawingGroupdrawingGroup=newDrawingGroup();
            DrawingContextdrawingContext=drawingGroup.Open();
            DrawingGeometry(drawingContext,value,maxValue,radiusX,radiusY,thickness);
            DrawingBrushbrush=newDrawingBrush(drawingGroup);
            returnbrush;
        }
 
    }

以上就是c#实现圆形的进度条(ProgressBar)的详细内容，更多关于c#实现进度条的资料请关注毛票票其它相关文章！

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c# 实现圆形的进度条(ProgressBar)

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