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Normal Topic Finding items in view (Read 1028 times)
gea
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Finding items in view
Sep 25th, 2012 at 9:59pm
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I want to enumerate the DiagramItems visible for the given DiagramView scroll position.   I can get the RectangleF in document terms, that is ClientToDoc() of the ClientRectangle of the DiagramView.  How do I go from that to DiagramItems?  Using v5.5.
  
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Lyubo
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Re: Finding items in view
Reply #1 - Sep 26th, 2012 at 6:05am
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Hi,

After you've determined the viewport, enumerate the DiagramItem instances in the Diagram.Items collection and check if their bounds intersect with the client rectangle. For example:

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RectangleF viewport = diagramView1.ClientToDoc(diagramView1.ClientRectangle);
List<DiagramItem> visible = new List<DiagramItem>();

foreach (DiagramItem item in diagramView1.Diagram.Items)
{
    if (item.GetBounds().IntersectsWith(viewport))
        visible.Add(item);
}


Since v6.0 of the component, Diagram item collection types implement the generic IList interface, so the enumaration could be done in a one line Linq query:

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var visible = diagram1.Items.Where(x => x.GetBounds().IntersectsWith(viewport));


Regards,
Lyubo
  
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