c#如何实现绘制波浪线-创新互联

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效果图

界面绘制操作

private Point? _startPoint = null;
  private void ContainerCanvas_OnPreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
  {
    var position = e.GetPosition(ContainerCanvas);
    if (_startPoint == null)
    {
      _startPoint = position;
    }
    else
    {
      //删除预览
      if (_previewLineElement != null)
      {
        ContainerCanvas.Children.Remove(_previewLineElement);
        _previewLineElement = null;
        _lastMovedPoint = null;
      }
      //确定结束点，绘制波浪线
      var myLineElement = new MyLineElement();
      myLineElement.DrawLine((Point)_startPoint, position);
      ContainerCanvas.Children.Add(myLineElement);
      _startPoint = null;
    }
  }

  private MyLineElement _previewLineElement = null;
  private Point? _lastMovedPoint = null;

  /// 

  /// 波浪线绘制预览
  /// 
  /// 
  /// 
  private void ContainerCanvas_OnMouseMove(object sender, MouseEventArgs e)
  {
    var position = e.GetPosition(ContainerCanvas);
    if (_startPoint != null && (_lastMovedPoint == null || _lastMovedPoint != null & (position - (Point)_lastMovedPoint).Length >= 2))
    {
      _lastMovedPoint = position;
      if (_previewLineElement != null)
      {
        ContainerCanvas.Children.Remove(_previewLineElement);
      }
      var myLineElement = new MyLineElement();
      myLineElement.DrawLine((Point)_startPoint, position);
      ContainerCanvas.Children.Add(myLineElement);
      _previewLineElement = myLineElement;
    }
  }