c# 实现圆形的进度条(ProgressBar)

这篇文章主要介绍了c# 如何实现圆形的进度条(ProgressBar)，帮助大家更好的理解和学习使用c#，感兴趣的朋友可以了解下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c#教程是怎么实现的呢？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

<ProgressBar Name="pb" Minimum="0" Maximum="100" ><ProgressBar.Template><ControlTemplate TargetType="ProgressBar"><Border Background="{TemplateBinding Value, Converter={StaticResource ValueToProcessConverter}, ConverterParameter=250}"/></ControlTemplate></ProgressBar.Template>
</ProgressBar>

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：

private Brush DrawBrush(double value, double maxValue, double radiusX, double radiusY, double thickness){DrawingGroup drawingGroup = new DrawingGroup();DrawingContext drawingContext = drawingGroup.Open();DrawingGeometry(drawingContext, value, maxValue, radiusX, radiusY, thickness);DrawingBrush brush = new DrawingBrush(drawingGroup);return brush;}

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。

private void DrawingGeometry(DrawingContext drawingContext, double value, double maxValue, double radiusX, double radiusY, double thickness){drawingContext.DrawEllipse(null, new Pen(EllipseBrush, thickness), centerPoint, radiusX, radiusY);drawingContext.DrawGeometry(NormalBrush, new Pen(), GetGeometry(value, maxValue, radiusX, radiusY, thickness));FormattedText formatWords = new FormattedText(percentString, CultureInfo.CurrentCulture, FlowDirection.LeftToRight, SuccessRateTypeface, SuccessRateFontSize, NormalBrush);Point startPoint = new Point(centerPoint.X - formatWords.Width / 2, centerPoint.Y - formatWords.Height / 2 - SuccessRateFontCorrectionValue);drawingContext.DrawText(formatWords, startPoint);drawingContext.Close();}

public class ValueToProcessConverter : IValueConverter{readonly double Thickness = 20;private Point centerPoint;private double radius;readonly SolidColorBrush NormalBrush = new SolidColorBrush(Colors.White);readonly SolidColorBrush EllipseBrush = new SolidColorBrush(Color.FromRgb(107, 132, 165));string percentString;private static readonly Typeface SuccessRateTypeface;private const int SuccessRateFontSize = 65;readonly double SuccessRateFontCorrectionValue = 12;static ValueToProcessConverter(){SuccessRateTypeface = new Typeface(new FontFamily("MSYH"), new FontStyle(), new FontWeight(), new FontStretch());}public ValueToProcessConverter(){}public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture){if (value is double && !string.IsNullOrEmpty((string)parameter)){double arg = (double)value;double width = double.Parse((string)parameter);radius = width / 2;centerPoint = new Point(radius, radius);return DrawBrush(arg, 100, radius, radius, Thickness);}else{throw new ArgumentException();}}public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture){throw new NotImplementedException();}/// <summary>/// 根据角度获取坐标/// </summary>/// <param name="CenterPoint"></param>/// <param name="r"></param>/// <param name="angel"></param>/// <returns></returns>private Point GetPointByAngel(Point CenterPoint, double r, double angel){Point p = new Point();p.X = Math.Sin(angel * Math.PI / 180) * r + CenterPoint.X;p.Y = CenterPoint.Y - Math.Cos(angel * Math.PI / 180) * r;return p;}/// <summary>/// 根据4个坐标画出扇形/// </summary>/// <param name="bigFirstPoint"></param>/// <param name="bigSecondPoint"></param>/// <param name="smallFirstPoint"></param>/// <param name="smallSecondPoint"></param>/// <param name="bigRadius"></param>/// <param name="smallRadius"></param>/// <param name="isLargeArc"></param>/// <returns></returns>private Geometry DrawingArcGeometry(Point bigFirstPoint, Point bigSecondPoint, Point smallFirstPoint, Point smallSecondPoint, double bigRadius, double smallRadius, bool isLargeArc){PathFigure pathFigure = new PathFigure { IsClosed = true };pathFigure.StartPoint = bigFirstPoint;pathFigure.Segments.Add(new ArcSegment{Point = bigSecondPoint,IsLargeArc = isLargeArc,Size = new Size(bigRadius, bigRadius),SweepDirection = SweepDirection.Clockwise});pathFigure.Segments.Add(new LineSegment { Point = smallSecondPoint });pathFigure.Segments.Add(new ArcSegment{Point = smallFirstPoint,IsLargeArc = isLargeArc,Size = new Size(smallRadius, smallRadius),SweepDirection = SweepDirection.Counterclockwise});PathGeometry pathGeometry = new PathGeometry();pathGeometry.Figures.Add(pathFigure);return pathGeometry;}/// <summary>/// 根据当前值和最大值获取扇形/// </summary>/// <param name="value"></param>/// <param name="maxValue"></param>/// <returns></returns>private Geometry GetGeometry(double value, double maxValue, double radiusX, double radiusY, double thickness){bool isLargeArc = false;double percent = value / maxValue;percentString = string.Format("{0}%", Math.Round(percent * 100, 2));double angel = percent * 360D;if (angel > 180) isLargeArc = true;double bigR = radiusX + thickness / 2;double smallR = radiusX - thickness / 2;Point firstpoint = GetPointByAngel(centerPoint, bigR, 0);Point secondpoint = GetPointByAngel(centerPoint, bigR, angel);Point thirdpoint = GetPointByAngel(centerPoint, smallR, 0);Point fourpoint = GetPointByAngel(centerPoint, smallR, angel);return DrawingArcGeometry(firstpoint, secondpoint, thirdpoint, fourpoint, bigR, smallR, isLargeArc);}/// <summary>/// 画扇形/// </summary>/// <param name="drawingContext"></param>/// <param name="value"></param>/// <param name="maxValue"></param>/// <param name="radiusX"></param>/// <param name="radiusY"></param>/// <param name="thickness"></param>private void DrawingGeometry(DrawingContext drawingContext, double value, double maxValue, double radiusX, double radiusY, double thickness){drawingContext.DrawEllipse(null, new Pen(EllipseBrush, thickness), centerPoint, radiusX, radiusY);drawingContext.DrawGeometry(NormalBrush, new Pen(), GetGeometry(value, maxValue, radiusX, radiusY, thickness));FormattedText formatWords = new FormattedText(percentString, CultureInfo.CurrentCulture, FlowDirection.LeftToRight, SuccessRateTypeface, SuccessRateFontSize, NormalBrush);Point startPoint = new Point(centerPoint.X - formatWords.Width / 2, centerPoint.Y - formatWords.Height / 2 - SuccessRateFontCorrectionValue);drawingContext.DrawText(formatWords, startPoint);drawingContext.Close();}/// <summary>/// 根据当前值和最大值画出进度条/// </summary>/// <param name="value"></param>/// <param name="maxValue"></param>/// <returns></returns>private Brush DrawBrush(double value, double maxValue, double radiusX, double radiusY, double thickness){DrawingGroup drawingGroup = new DrawingGroup();DrawingContext drawingContext = drawingGroup.Open();DrawingGeometry(drawingContext, value, maxValue, radiusX, radiusY, thickness);DrawingBrush brush = new DrawingBrush(drawingGroup);return brush;}}

以上就是c# 实现圆形的进度条(ProgressBar)的详细内容

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