/// <summary>
/// 波浪线绘制预览
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
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 NewLineElement();
myLineElement.DrawLine((Point)_startPoint, position);
ContainerCanvas.Children.Add(myLineElement);
_previewLineElement = myLineElement;
}
}
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 NewLineElement();
myLineElement.DrawLine((Point)_startPoint, position);
ContainerCanvas.Children.Add(myLineElement);
_startPoint = null;
}
}