汕尾手机网站设计,奇网企业网站管理系统,网络设置了代理是什么意思,注册网站步骤1.说明#xff1a;在WPF中#xff0c;文件下载时需要显示下载进度#xff0c;由于系统自带的条型进度条比较占用空间#xff0c;改用圆形的进度条,需要在DrawingVisual上呈现。 运行的效果如图#xff1a; private Point GetPointOnCir(Point CenterPoint, double r, doub…1.说明在WPF中文件下载时需要显示下载进度由于系统自带的条型进度条比较占用空间改用圆形的进度条,需要在DrawingVisual上呈现。 运行的效果如图 private Point GetPointOnCir(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;}private Geometry drawingArc(Point bigCirclefirstPoint, Point bigCirclesecondPoint, Point smallCirclefirstPoint, Point smallCirclesecondPoint, double bigCircleRadius, double smallCircleRadius,bool isLargeArc){PathFigure pathFigure new PathFigure { IsClosed true };pathFigure.StartPoint bigCirclefirstPoint;pathFigure.Segments.Add(new ArcSegment{Point bigCirclesecondPoint,IsLargeArc isLargeArc,Size new Size(bigCircleRadius, bigCircleRadius),SweepDirection SweepDirection.Clockwise});pathFigure.Segments.Add(new LineSegment { Point smallCirclesecondPoint });pathFigure.Segments.Add(new ArcSegment{Point smallCirclefirstPoint,IsLargeArc isLargeArc,Size new Size(smallCircleRadius, smallCircleRadius),SweepDirection SweepDirection.Counterclockwise});PathGeometry pathGeometry new PathGeometry();pathGeometry.Figures.Add(pathFigure);return pathGeometry;}//根据已保存的大小和文件总大小来计算下载进度百分比private Geometry GetGeometry(){bool isLargeArc false;double percent double.Parse(Convert.ToString(savedSize)) / double.Parse(Convert.ToString(fileSize));PercentString string.Format({0}%,Math.Round(percent*100,0));double angel percent * 360D;if(angel180)isLargeArctrue;//double angel 45;double bigR 16;double smallR 13;Point centerPoint vl.StartPoint;//new Point(100, 300);Point firstpoint GetPointOnCir(centerPoint, bigR, 0);Point secondpoint GetPointOnCir(centerPoint, bigR, angel);Point thirdpoint GetPointOnCir(centerPoint, smallR, 0);Point fourpoint GetPointOnCir(centerPoint, smallR, angel);return drawingArc(firstp, secondpoint, thirdpoint, fourpoint, bigR, smallR, isLargeArc);}   画圆形的进度条实际上是动态画两个同心圆根据文件保存的百分比来计算画弧形的角度的大小需要7个参数大圆的半径bigR 、小圆的半径smallR 、同心圆的圆心centerPoint 、大圆的起始点firstpoint 、大圆的结束点secondpoint 、小圆的起始点thirdpoint、小圆的结束点fourpoint     最后需要使用DrawingContext把圆给画出来 public Visual drawShape(){DrawingVisual drawingWordsVisual new DrawingVisual();DrawingContext drawingContext drawingWordsVisual.RenderOpen();try{if (savedSize ! fileSize){drawingContext.DrawEllipse(null, new Pen(Brushes.Gray, 3), vl.StartPoint, 13, 13);drawingContext.DrawGeometry(vs.VisualBackgroundBrush, vs.VisualFramePen, GetGeometry());FormattedText formatWords new FormattedText(PercentString, System.Globalization.CultureInfo.CurrentCulture, FlowDirection.LeftToRight, new Typeface(vs.WordsFont.Name), vs.WordsFont.Size, currentStyle.VisualBackgroundBrush);formatWords.SetFontWeight(FontWeights.Bold);Point startPoint new Point(vl.StartPoint.X - formatWords.Width / 2, vl.StartPoint.Y - formatWords.Height / 2);drawingContext.DrawText(formatWords, startPoint);}else{drawingContext.DrawEllipse(null, new Pen(Brushes.Green, 3), vl.StartPoint, 16, 16);FormattedText formatWords new FormattedText(Open, System.Globalization.CultureInfo.CurrentCulture, FlowDirection.LeftToRight, new Typeface(vs.WordsFont.Name), vs.WordsFont.Size, Brushes.Red);formatWords.SetFontWeight(FontWeights.Bold);Point startPoint new Point(vl.StartPoint.X - formatWords.Width / 2, vl.StartPoint.Y - formatWords.Height / 2);drawingContext.DrawText(formatWords, startPoint);}}catch (Exception ex){new SaveExceptionInfo().SaveLogAsTXTInfoex(ex.Message);}finally{drawingContext.Close();}return drawingWordsVisual;} 转载于:https://www.cnblogs.com/goxmpx/p/3741915.html