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1. In the list of detection tools, highlight a Line Crossing object (1).
   Image Modified

2. In the viewing tile (2), set the endpoints of the line which, when intersected, will trigger Line Crossing detection.

   Info
   title Note

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1. When the line is being constructed, the end points are connected by a two-color dotted line. The direction of the object's motion across the line is indicated by dotted arrows (2

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1. Action	Result
   Left-click in the viewing tile	Creates a line end point
   Position the cursor on an end point and, holding down the left mouse button, move the mouse	Moves the line end point
   Click the button Image Modified	Deletes the line

2. By default, Line Crossing detection monitors object motion across the line in both directions. To suspend detection of motion in one direction, click the button corresponding to that direction.
   
   

   Note
   title Attention!
   At least one direction must be selected for detection

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1. Info
   title Note

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1. An unmonitored direction of object motion is indicated by a dimmed arrow

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2. Click the Apply button.

The line is now set.

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