protected override Rect GetRectangle(RowOrientation orientation, TreeMapItem item, double x, double y, double width, double height)
{
if (orientation == RowOrientation.Horizontal)
return new Rect(x, y, width, item.RealArea / width);
else
return new Rect(x, y, item.RealArea / height, height);
}
public static int CompareByValueDecreasing(TreeMapItem x, TreeMapItem y)
{
if (x == null)
{
return y == null ? -1 : 0;
}
else
{
return y == null ? 1 : x.Weight.CompareTo(y.Weight) * -1;
}
}
private void PrepareItems()
{
_totalWeight = 0;
Items.Clear();
foreach (var child in Children)
{
var element = new TreeMapItem(child, GetWeight(child));
if (this.IsValidItem(element))
{
_totalWeight += element.Weight;
Items.Add(element);
}
else
{
element.ComputedSize = Size.Empty;
element.ComputedLocation = new Point(0, 0);
element.UIElement.Measure(element.ComputedSize);
element.UIElement.Visibility = Visibility.Collapsed;
}
}
Items.Sort(TreeMapItem.CompareByValueDecreasing);
}
private bool IsValidItem(TreeMapItem item)
{
return (item != null && !double.IsNaN(item.Weight) && Math.Round(item.Weight, 0) != 0);
}