WPF製作了一個環形的進度條，如圖，其中主要就是使用Path,然後給新建圓弧，前臺Path.Data是不可能的了，要後臺新建圓弧，接下來就是相應方法
先給個xaml的例子
<!--起點 起點x,起點y 畫橢圓 長軸,短軸 旋轉角度 是否是優弧 正角方向繪製 終點x,終點y -->
<Path x:Name="cycleProcess" Data="M50,95 A45,45 0 1 1 95, 45" Stroke="#3CB4E5" StrokeThickness="4">
<Path.RenderTransform>
<RotateTransform x:Name="rotate">
</RotateTransform>
</Path.RenderTransform>
</Path>
首先需要明白一點，圓弧無法打開100%，如果到了100%那就變成了點，所以在數值到了100%的時候需要手動調整爲不滿100，可以是99.999；
起點確定，終點座標使用三角函數計算，然後就是判斷在第幾象限，每個象限加減不同
此處給出刷新方法，可自行參考
private void Update()
{
RangeValue = Max - Min;
//百分比
if(CycleProgressBarValueType == CycleProgressBarValueType.Percentage)
{
valueLabel.Content = ((int)(Value / RangeValue * 1000)) / 10f;
}
//數字模式
else if(CycleProgressBarValueType == CycleProgressBarValueType.Value)
{
valueLabel.Content = Value;
}
showValue = Value;
if (showValue == Max)
showValue = Max - 0.001;
height = Height;
if(double.IsNaN(height))
height = ActualHeight;
width = Width;
if (double.IsNaN(width))
width = ActualWidth;
if (height <= 0) return;
if (width <= 0) return;
rotate.CenterX = height / 2d;
rotate.CenterY = width / 2d;
rotate.Angle = OffValue / 2d;
double value = showValue / RangeValue * (360 - OffValue);
value = value / 180 * Math.PI;
double x = 0;
double y = 0;
double cos = 0;
double sin = 0;
//按照起點算象限 最下方爲起點
bool isLargeArc = false;
//左下角
if (value <= Math.PI / 2d)
{
cos = Math.Cos(value);
sin = Math.Sin(value);
x = width / 2d - (width / 2d - 5) * sin;
y = height / 2d + (height / 2d - 5) * cos;
}
//左上角
else if (value <= Math.PI)
{
value -= Math.PI / 2.0;
cos = Math.Cos(value);
sin = Math.Sin(value);
x = width / 2d - (width / 2d - 5) * cos;
y = height / 2d - (height / 2d - 5) * sin;
}
//右上角
else if (value <= Math.PI * 3/2.0)
{
value -= Math.PI;
isLargeArc = true;
cos = Math.Cos(value);
sin = Math.Sin(value);
x = width / 2d + (width / 2d - 5) * sin;
y = height / 2d - (height / 2d - 5) * cos;
}
//右下角
else
{
value -= Math.PI *3 / 2.0;
isLargeArc = true;
cos = Math.Cos(value);
sin = Math.Sin(value);
x = width / 2d + (width / 2d - 5) * cos;
y = height / 2d + (height / 2d - 5) * sin;
}
ArcSegment arcSegment = new ArcSegment(new Point(x,y), new Size(width / 2 - 5, height / 2 - 5), 0,
isLargeArc, SweepDirection.Clockwise, true);
PathSegmentCollection pathSegments = new PathSegmentCollection();
pathSegments.Add(arcSegment);
PathFigure pathFigure = new PathFigure(new Point(width / 2, height - 5), pathSegments, false);
PathFigureCollection pathFigures = new PathFigureCollection();
pathFigures.Add(pathFigure);
PathGeometry pathGeometry = new PathGeometry();
pathGeometry.Figures = pathFigures;
//GeometryGroup geometryGroup = new GeometryGroup();
//geometryGroup.Children.Add(pathGeometry);
cycleProcess.Data = pathGeometry;
}