用Shape做动画的实例详解

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_storyboard = new Storyboard();
Random random = new Random();for (int i = 0; i < _pathFigure.Segments.Count; i++)
{var animation = new PointAnimation { Duration = TimeSpan.FromSeconds(3) };
    Storyboard.SetTarget(animation, _pathFigure.Segments[i]);
    Storyboard.SetTargetProperty(animation, "(LineSegment.Point)");
    animation.EnableDependentAnimation = true;
    animation.EasingFunction = new QuarticEase { EasingMode = EasingMode.EaseOut };
    animation.To = new Point((_pathFigure.Segments[i] as LineSegment).Point.X, (i % 2 == 0 ? 1 : -1) * i * 1.2 + 60);
    _storyboard.Children.Add(animation);
}
_storyboard.Begin();

private PointCollection GetCurrentPoints(PointCollection fromPoints, PointCollection toPoints, double percentage)
{var result = new PointCollection();for (var i = 0;
        i < Math.Min(fromPoints.Count, toPoints.Count);
        i++)
    {
        var x = (1 - percentage / 100d) * fromPoints[i].X + percentage / 100d * toPoints[i].X;
        var y = (1 - percentage / 100d) * fromPoints[i].Y + percentage / 100d * toPoints[i].Y;

        result.Add(new Point(x, y));
    }return result;
}

97.3,0 127.4,60.9 194.6,70.7 145.9,118.1 157.4,185.1 97.3,153.5 37.2,185.1 48.6,118.1 0,70.7 67.2,60.9110,58.2 147.3,0 192.1,29 141.7,105.1 118.7,139.8 88.8,185.1 46.1,156.5 0,125 23.5,86.6 71.1,116.7…

97.3,0 127.4,60.9 194.6,70.7 145.9,118.1 157.4,185.1 97.3,153.5 37.2,185.1 48.6,118.1 0,70.7 67.2,60.9110,58.2 147.3,0 192.1,29 141.7,105.1 118.7,139.8 88.8,185.1 46.1,156.5 0,125 23.5,86.6 71.1,116.7

[ContentProperty(Name = nameof(Children))]public class ProgressToPointCollectionBridge : DependencyObject
{public ProgressToPointCollectionBridge()
    {
        Children = new ObservableCollection();
    }/// 
///     获取或设置Points的值/// 
public PointCollection Points
    {get { return (PointCollection) GetValue(PointsProperty); }set { SetValue(PointsProperty, value); }
    }/// 
///     获取或设置Progress的值/// 
public double Progress
    {get { return (double) GetValue(ProgressProperty); }set { SetValue(ProgressProperty, value); }
    }/// 
///     获取或设置Children的值/// 
public Collection Children
    {get { return (Collection) GetValue(ChildrenProperty); }set { SetValue(ChildrenProperty, value); }
    }protected virtual void OnProgressChanged(double oldValue, double newValue)
    {UpdatePoints();
    }protected virtual void OnChildrenChanged(Collection oldValue, Collection newValue)
    {var oldCollection = oldValue as INotifyCollectionChanged;if (oldCollection != null)
            oldCollection.CollectionChanged -= OnChildrenCollectionChanged;var newCollection = newValue as INotifyCollectionChanged;if (newCollection != null)
            newCollection.CollectionChanged += OnChildrenCollectionChanged;UpdatePoints();
    }private void OnChildrenCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
    {UpdatePoints();
    }private void UpdatePoints()
    {if (Children == null || Children.Any() == false)
        {
            Points = null;
        }else if (Children.Count == 1)
        {var fromPoints = new PointCollection();for (var i = 0; i < Children[0].Count; i++)
                fromPoints.Add(new Point(0, 0));var toPoints = Children[0];
            Points = GetCurrentPoints(fromPoints, toPoints, Progress);
        }else{var rangePerSection = 100d / (Children.Count - 1);var fromIndex = Math.Min(Children.Count - 2, Convert.ToInt32(Math.Floor(Progress / rangePerSection)));
            fromIndex = Math.Max(fromIndex, 0);var toIndex = fromIndex + 1;
            PointCollection fromPoints;if (fromIndex == toIndex)
            {
                fromPoints = new PointCollection();for (var i = 0; i < Children[0].Count; i++)
                    fromPoints.Add(new Point(0, 0));
            }else{
                fromPoints = Children.ElementAt(fromIndex);
            }var toPoints = Children.ElementAt(toIndex);
            var percentage = (Progress / rangePerSection - fromIndex) * 100;

            Points = GetCurrentPoints(fromPoints, toPoints, percentage);
        }
    }private PointCollection GetCurrentPoints(PointCollection fromPoints, PointCollection toPoints, double percentage)
    {var result = new PointCollection();for (var i = 0;
            i < Math.Min(fromPoints.Count, toPoints.Count);
            i++)
        {
            var x = (1 - percentage / 100d) * fromPoints[i].X + percentage / 100d * toPoints[i].X;
            var y = (1 - percentage / 100d) * fromPoints[i].Y + percentage / 100d * toPoints[i].Y;

            result.Add(new Point(x, y));
        }return result;
    }#region DependencyProperties#endregion}