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+-- Forum: Products Forums (https://forum.ab4d.com/forumdisplay.php?fid=4)
+--- Forum: ZoomPanel (https://forum.ab4d.com/forumdisplay.php?fid=8)
+--- Thread: Outside of viewbox (/showthread.php?tid=3964)
Outside of viewbox - Björn - 02-17-2016
Hi,
Is there a ways to know if a control is in or out of the current viewbox?
I made a test with a grid (inside the zoom panel) that contains 100 x 100 rectangles. I want to change the colors of the rectangles which are inside or outside of the viewbox. In my example the ViewBox.Contains(Point) method never returns true.
public void UpdateViewbox(Ab2d.Controls.ZoomPanel panel)
{
foreach (Rectangle item in MyGrid.Children)
{
Point point = item.TranslatePoint(new Point(0,0), this);
if (panel.Viewbox.Contains(point))
{
item.Fill = Brushes.Red;
}
else
{
item.Fill = Brushes.Blue;
}
}
}
Is there an example of how to do that?
RE: Outside of viewbox - abenedik - 02-17-2016
The idea to use TranslatePoint and Contains methods is very interesting.
But the problem is that the ZoomPanel's Viewbox property is in relative units (1 is full width / height), but the translated points are in absolute positions.
The solution is pretty simple - instead of ZoomPanel's Viewbox you need to use a rectangle that is created from ZoomPanel's actual size:
Code:
var zoomPanelBounds = new Rect(0, 0, panel.ActualWidth, panel.ActualHeight);
foreach (Rectangle item in ItemsGrid.Children.OfType<Rectangle>())
{
Point point = item.TranslatePoint(new Point(0, 0), this);
if (zoomPanelBounds.Contains(point))
{
item.Fill = Brushes.Red;
}
else
{
item.Fill = Brushes.Blue;
}
}RE: Outside of viewbox - Björn - 02-22-2016
Thank you for the corrected example, it works perfectly!