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For each type of situation analysis detection tool you must set a virtual element of one of two types:

1. A line
2. An area

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The type of visual element is determined by the detection type. Only the Line crossing detection requires you to set a Line element. Other situation analysis detection tools require you to set an Area element for each detection tool.

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Line

The Line visual element sets a virtual line in the field of view of a video camera; when something crosses this line, it triggers the Line Crossing detection tool.
To set a line, you must perform the following steps:

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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Area

The Area visual element sets an area of a video camera's field of view, in which the situation is analyzed by a detection tool of the selected type.
To set an area, you must perform the following steps:

1. In the Detection Tools list, highlight the Detection Tool object for which you need to set an area (1).
   Image Modified

2. In the viewing tile (2) set the nodes of the area, in order, in which the situation requires analysis.

   Info
   title Note

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1. When the area is being constructed, the nodes are connected by a two-color dotted line which outlines the area's borders

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1. Action	Result
   Left-click in the viewing tile	Creates a new area node
   Right-click on a created node	Deletes the area node
   Position the cursor on a node and hold down the left mouse button while you move the mouse	Moves the area node
   Click the button Image Modified	Deletes the area

2. Click the Apply button.

The area is now set.