/// <summary>
/// 设置圆的位置和旋转角度
/// </summary>
private void SetEclipsePosition(ProgressBarDataModel dataModel)
{
//圆周长就是：C = π * d 或者C=2*π*r（其中d是圆的直径，r是圆的半径）
double r = dataModel.R;
var children = ProgressBarCanvas.Children;
int count = children.Count;
double step = (Math.PI * 2) / count;
//根据圆中正弦、余弦计算距离
int index = 0;
foreach (var element in children)
{
var ellipse = element as Ellipse;
//透明度
var opacity = Convert.ToDouble(index) / (count - 1);
ellipse.SetValue(UIElement.OpacityProperty, opacity < 0.05 ? 0.05 : opacity);
//距离
double left = r + Math.Sin(step * index) * r;
ellipse.SetValue(Canvas.LeftProperty, left);
double top = r - Math.Cos(step * index) * r;
ellipse.SetValue(Canvas.TopProperty, top);
index++;
}
}
/// <summary>
/// 加载后刷新
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void ProgressBarControl_OnLoaded(object sender, RoutedEventArgs e)
{
animationTimer = new DispatcherTimer(DispatcherPriority.ContextIdle, Dispatcher);
//指定时间间隔
animationTimer.Interval = new TimeSpan(0, 0, 0, 0, TimeSpan);
if (EllipseCount < 1)
{
EllipseCount = 12;
}
ProgressBarCanvas.Children.Clear();
for (int i = 0; i < EllipseCount; i++)
{
ProgressBarCanvas.Children.Add(new Ellipse());
}
var dataModel = new ProgressBarDataModel()
{
CanvasSize = CanvasSize,
EclipseSize = EllipseSize
};
_dataModel = dataModel;
this.DataContext = dataModel;
}