/// <summary>
/// Crop diagram to displayed time range, for performance, bigger zoom range
/// </summary>
private void OnCropDiagram(object sender, RoutedEventArgs e)
{
DiagramPara para = new DiagramPara();
para.scrollOffset = m_scrollViewer.HorizontalOffset;
para.zoom = m_zoomSlider.Value;
para.t0 = m_diagramT0;
para.t1 = m_diagramT1;
m_cropList.Push(para);
if (m_cropList.Count == 1)
{
m_undoButton.IsEnabled = true;
}
m_diagramT0 = m_diagramHolder.GetValueX(para.scrollOffset); // Real start time displayed
m_diagramT1 = m_diagramHolder.GetValueX(para.scrollOffset + m_diagramHolder.Width / para.zoom); // Real end time displayed
m_zoomSlider.Value = 1; // Update zoom to 1
m_scrollViewer.ScrollToHorizontalOffset(0);
m_statusBar.Status = String.Format("CropTo({0:N3} .. {1:N3})", m_diagramT0, m_diagramT1);
}
/// <summary>
/// Undo Crop
/// </summary>
private void OnUndoCrop(object sender, RoutedEventArgs e)
{
if (m_cropList.Count != 0)
{
DiagramPara para = m_cropList.Pop();
m_diagramT0 = para.t0;
m_diagramT1 = para.t1;
m_zoomSlider.Value = para.zoom;
m_scrollViewer.ScrollToHorizontalOffset(para.scrollOffset);
}
if (m_cropList.Count == 0)
{
m_undoButton.IsEnabled = false;
}
}