在 WPF 中对路径中的点进行动画处理
本文关键字:动画 处理 WPF 路径 | 更新日期: 2023-09-27 18:30:43
我正在尝试使用 C# 代码和 WPF 对路径中的 3 个点进行动画处理。
我很接近,虽然我觉得代码很乱。
现在的一个问题是,当我对三个点中的第一个点进行动画处理时,它看起来像是在它行进的地方画了一条线。
这是它正在做的事情的两种状态的链接:https://i.stack.imgur.com/QWXuz.jpg
当它以动画形式显示箭头指向左侧方向时,您会在顶部看到一条额外的线。
public class SlideOutButton : ContentControl
{
Path _arrowPath;
PathSegmentCollection _pathSegments;
public SlideOutButton(double strokeThickness = 1.0d)
{
_arrowPath = new Path();
PathGeometry pathGeo = new PathGeometry();
PathFigure figure = new PathFigure();
_pathSegments = new PathSegmentCollection();
_pathSegments.Add(new LineSegment(new Point(0, 0), true));
_pathSegments.Add(new LineSegment(new Point(2, 3), true));
_pathSegments.Add(new LineSegment(new Point(0, 6), true));
figure.Segments = _pathSegments;
pathGeo.Figures.Add(figure);
_arrowPath.Data = pathGeo;
_arrowPath.Stroke = Brushes.Black;
_arrowPath.StrokeThickness = strokeThickness;
_arrowPath.Stretch = Stretch.Uniform;
this.Content = _arrowPath;
this.PreviewMouseLeftButtonUp += SlideOutButton_MouseLeftButtonUp;
}
private void SlideOutButton_MouseLeftButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
PointAnimation pointAnim = new PointAnimation();
pointAnim.From = new Point(0, 0);
pointAnim.To = new Point(2, 0);
Point point = (_pathSegments.ElementAt(0) as LineSegment).Point;
LineSegment segment = (_pathSegments.ElementAt(0) as LineSegment);
segment.BeginAnimation(LineSegment.PointProperty, pointAnim);
PointAnimation pointAnim2 = new PointAnimation();
pointAnim2.From = new Point(2, 3);
pointAnim2.To = new Point(0, 3);
Point point2 = (_pathSegments.ElementAt(1) as LineSegment).Point;
LineSegment segment2 = (_pathSegments.ElementAt(1) as LineSegment);
segment2.BeginAnimation(LineSegment.PointProperty, pointAnim2);
PointAnimation pointAnim3 = new PointAnimation();
pointAnim3.From = new Point(0, 6);
pointAnim3.To = new Point(2, 6);
Point point3 = (_pathSegments.ElementAt(2) as LineSegment).Point;
LineSegment segment3 = (_pathSegments.ElementAt(2) as LineSegment);
segment3.BeginAnimation(LineSegment.PointProperty, pointAnim3);
}
private PathGeometry _CreatePathGeo(bool left = false)
{
PathGeometry pathGeo = new PathGeometry();
PathFigure figure = new PathFigure();
PathSegmentCollection pathSegments = new PathSegmentCollection();
pathSegments.Clear();
if (!left)
{
pathSegments.Add(new LineSegment(new Point(0, 0), true));
pathSegments.Add(new LineSegment(new Point(2, 3), true));
pathSegments.Add(new LineSegment(new Point(0, 6), true));
}
else
{
pathSegments.Add(new LineSegment(new Point(2, 0), true));
pathSegments.Add(new LineSegment(new Point(0, 3), true));
pathSegments.Add(new LineSegment(new Point(2, 6), true));
}
figure.Segments = pathSegments;
pathGeo.Figures.Add(figure);
return pathGeo;
}
}
另外,如果您能想到一种更简单的方法来创建此动画,请告诉我。(仅使用 C#)。
谢谢!
在进行了一些调试后,我发现问题是我的路径中有一个额外的点。
PathFigure 类上有一个名为 StartPoint 的属性。当我创建我的路径时,我总共有 4 分,包括起点。
为了解决这个问题,我必须使用PathFigures起点作为我的第一点:
Point starPoint = (_arrowPath.Data as PathGeometry).Figures[0].StartPoint;
然后我只添加两个线段作为接下来的两个点:
_pathSegments.Add(new LineSegment(new Point(2, 3), true));
_pathSegments.Add(new LineSegment(new Point(0, 6), true));
然后,我使用这三个点进行动画制作。