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Category: AddIn: Base Elements
Creator: OkazoLab Team Scope: Parent Event
Owns Snippets: no Usage: Runtime Screen,Snippets

Synchronized Internal Actions

Experiment StartParent Event OnsetStatus change between Onset/OffsetParent Event OffsetExperiment End
Is displayed on screen Is removed from screen


Generic Properties

NameDescriptionConstraintsValue TypeUpon Runtime Change
Checkboard Settings
Ring CountNumber of rings in the patch DoubleVisual Update
Slice CountNumber of slices in each ring DoubleVisual Update
Inner RadiusInner radius of the patch in percentages (0..100) DoubleVisual Update
Slice PhaseAngular position of the first slice in the inner ring (0..360) DoubleVisual Update
Slice ShiftRelative slice shift (in percentages) between neighboring rings. DoubleVisual Update
Ring Scale RatioCommon ratio of a geometric progression that is applied to the ring scales, starting from the inner ring. 1 denotes equal scales. DoubleVisual Update
Low patch colorLowest RGB color for the patch stColorVisual Update
High patch colorHighest RGB color for the patch stColorVisual Update

+=== Properties inherited from clVisualElement ===
NameDescriptionConstraintsValue TypeUpon Runtime Change
Alpha MaskingDefines whether the visual content rendered by this element will be used as an opacity mask which is applied onto the given event surface. The active opacity mask allows one to expose pixels of the parent event surface through a solid background of the given event. If the value is true, the darker pixels of the content will make more transparent holes on the entire event surface.Boolean
AntiAliasingIf true, the rendered content will be anti-aliased for smoother visual appearance. If false, rendering will be authentic to its source, e.g. a bitmap. Boolean
PositionDefines the position of the element viewport on the screen. The position can be set in any of three coordinate systems: a) pixels, b) polar, c) central. clPoint
SizeDefines the size of the element viewport on the screen. The size can be set in any of three coordinate systems: a) pixels, b) visual degrees, c) 'relative-to-screen' size. clSize
Z OrderIndicates the current depth order of the element viewport on the surface of the parent event. The greatest number corresponds to the top position. The order can be changed by moving the element up and down in the element list.Int32
Pivot PointDefines the pivot point (coordinate and the rotation centers) within the element viewport. stAlignment or Int32
VisibleDefines whether the element is currently visible on the event surface. The property is convenient for switching visual content on and off. Boolean
RotationDefines the rotation angle (in degrees) of element viewport relative to the its pivot point. Double in the range 0..360
Transparent ColorThe color of the original pixels of rendered content that will be set as transparent. stColor
Transparency ToleranceTolerance ratio for choosing colors that become transparent. Zero means that effect is not applied, 1 denotes that all colors will become trasparent. Int32, range (0..100)
Color MaskProduces a multiplicative combination of the original pixels and the selected mask color (except the alpha channel). The effect emulates a look through a colored glass. White or transparent mask color doesn't change the original pixels. stColor
OpacityOpacity of the rendered content. Int32, range (0..100)
ContrastContrast of the rendered content. Int32, range (-100..100)
BrightnessDefines the brighness of the rendered content. Int32, range (-100..100)
SaturationSaturation of the rendered content. Double
PixelationDefines the pixel scale of the rendering. Int32, range (0..100)
BlurringThe radius used in the gaussian blur of rendered content, as a pixel-based factor. The default is 0 which means no blurring. Int32
Reset JitterSet to true at runtime to reset the current positional jitter.Boolean, set true for action
Current JitterJitter range, in pixels (non inclusive)..clSize
Jitter RangeJitter range, centered at the original position of the element.. clSize

+=== Properties inherited from clElement === Inherited properties of clElement
NameDescriptionConstraintsValue TypeUpon Change
Is EnabledIf set to false the element is completely omitted when the experiment is run.Boolean
TitleTitle of the element.String


The Circular checkboard element is capable of generating circular checkbord patches defined by a parameter set.


Default Checkboard

Default Checkboard

Green yellow checkboard with  extra rings and slices

Green yellow checkboard with
extra rings and slices

Practical Use

Adding a Circular Checkboard that mimics tunnel-like look

  1. On an Event, click on "Add Element", under 'STIMULUS GENERATION', click on the "Circular Checkboard' element.
  2. Reduce the Inner Radius to 8.0 and increase the Ring Scale Ratio to 2.
  3. You may change the colours as desired


ScrewTurn Wiki version Some of the icons created by FamFamFam.