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Page Revision: 2011/08/09 14:46

Table of Contents [Hide/Show] Description Practical use     Instant mode     Fixation mode     Trapper mode Notes Properties     Genetic properties

Description ¶

Radar area is an element that monitors the relation between a continuous positional input in an experiment and a certain "watched" area on the screen. By default, the positional input in experiments is provided by a mouse. Other elements can replace the mouse input with an input from other positional devices, like eye trackers and joysticks. You can always combine several sources of the positional input in a single experiment. You also can define an appropriate shape, position and size of the watched area on the screen and change them at the runtime (for instance, in dynamical tracking paradigms, like the smooth pursuit tasks).

Practical use ¶

The radar area works with any input source only while the parent event is active. The element can work in one of three working modes:

Instant mode ¶

In this mode the element detects when positional input enters the "watched area". When it happens, the element instantly switches into the triggered state (the trigger time is recorder and custom user code executed, if it's defined).

Fixation mode ¶

In this mode the element detects when positional input enters the "watched area" and stays there for certain time duration. The duration is defined by the [Fixation duration] property of the element. When it happens, the element also switches into the triggered state.

Trapper mode ¶

In this mode the element detects detection when the positional input leaves the "watched area" (assuming that it has been inside before activation of the parent event). This mode is handy for continuous monitoring of the fixation breaks.

You can choose only between the rectangular or elliptical shape for the "watched area". It's sufficient for most of scenarios but, however, you can always create radar areas with complex shapes by combining several radar area elements in the same event. In this case you may need to check the states of multiple radar area elements manually, in your snippets.

Notes ¶

1. The radar area element can be triggered only once during activation of the parent event. If you need multiple triggering, redesign your experiment flow (e.g. use several events) or reactivate the parent event. Alternately, reading [Is Over] property of the element will provide a status of positional input even after the element is triggered.
2. the radar area element can be affected by the solar visual transformations if they are applied to the parent event. In such cases, relations between positional input and watched areas can be incorrectly estimated. Always place radar area elements in events that have no such transformations.
3. if you have several active radar area elements that watch the same screen area they can be triggered at the same time.
   

Properties ¶

Genetic properties ¶

Name	Description	Attributes	Value Type
Settings
Working mode	Defines the working mode for the element- its reaction on the positional input. One of three modes can be selected: Instant- the element is triggered at the moment when the current positional input goes inside of the "watched area" Fixation- the element is triggered if the current positional input stays in the "watched" area for the duration defines by the Fixation Duration property. It duration is set to 0, this mode is equivalent to the Instant mode. Trapper- the element is triggered if the current positional input leaves the "watched" area. Can be used for continuous monitoring of the fixation break.	D
Fixation duration	Defines the duration (in ms) of the fixation interval when the element works in the "fixation" mode. Otherwise, the value is not used.	D,R	UInt64
Runtime info
Is Over	Indicates at the runtime if the positional input is currently inside of the "watched area".	R, Read-only	Boolean
Trigger time	Shows event's time (ms) when the element was triggered. Event's time is the time passed since activation of the parent event. This property is recommended for obtaining the accurate reaction time data.	R, Read-only	UInt64 [ ]
Was triggered	Indicates if the element has been triggered starting from current activation of the parent event	R, Read-only	Boolean
Visual appearance
Border Visible	Defines if the perimeter of the "watched area" is shown at the runtime (e.g. in training sessions).	D,R*	Boolean
Area shape	Defines the shape of the watched area- ellipse or rectangle.	D	Int32
Position	Defines the position (Cartesian, radial) of the point on the screen to which "watched" area is aligned.	D,R,*	clPoint (X.Y,R,Theta)
Size	Defines the size (pixels, visual degrees) of the "watched" area on the screen.	D,R,*	clSize (Width,Height, aWidth,aHeight)
Z order	Indicates the visual depth order of the "watched" area on the surface of the parent event (if it's visible). Depends on relative position of the element in the elements list of the parent event.	R, Read-only
lignment	Defines alignment of the "watched" area to its position. The default value is the central alignment.	D,R,*	stAlignment Int32
Effects
Color mask	The selected color will set the effect of "look through the colored glass" on the perimeter border the element (if it's visible). The non-transparent colors will provide most adequate effect. White color means no effect.	D,R,*	clColor

+=== Properties inherited from clElement === Inherited properties of clElement

Name	Description	Constraints	Value Type	Upon Change
Control
Is Enabled	If set to false the element is completely omitted when the experiment is run.	Design Time..	Boolean
Title	Title of the element.	Design Time..	String

The list of Text element properties:

Resource Holder inherited properties

CATEGORY ,Property name	Description	type	Value type
RESOURCE LIST
Resource index	The index of item in the resource list that is currently used by the element. Notice, that index starts from 1.	D,R,*	Int32
Resource count	The number of items loaded in the resource list of the element	D,R,Read-only	Int32