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Element Icon Circular Checkboard
Category: Stimulus Generators AddIn: Visual Kernels
Creator: OkazoLab Scope: Parent event
Owns Snippets: None Usage: Stimulus screen


NameDescription                              ConstraintsTypeOn
Checkboard Settings
Ring Count        Defines a number of rings in the patch                Double         
Slice Count        Defines a number of slices on each ring                Double         
Inner Radius        Defines the inner radius of the patch in percentages to the total size                Double         
Slice Phase        Defines an angular position of the first slice in the inner ring, between 0 and 360 degrees                Double         
Slice Shift        Defines the relative slice shift (in percentages) between neighboring rings.                Double         
Ring Scale Ratio        Defines the common ratio of geometric progression that is applied to the ring scales, starting from the inner ring. The value 1 denotes the equal scales.                Double         
Low patch color        Defines the lowest RGB color in the patch                stColor         
High patch color        Defines the highest RGB color in the patch                stColor         
Visual Appearance
Alpha Masking        Defines, whether the visual content is used to create an opacity mask on the event surface. If masking is on, the content's pixel luminance (or, its inverse) defines transparency within element's viewport. The alpha masking allows, for example, create transparent holes on the event surface.                Int32         
AntiAliasing        if true, the rendered content will be antialiased for smoother visual appeariance. If false, rendering will be authentic to its source, e.g. a bitmap.                Boolean         
Position        Defines a position of the rendering viewport on the screen                clPoint         
Size        Defines a size of the element's rendering viewport on the screen                clSize         
Z Order        Indicates Z Order of the element on the given event                Int32         
Pivot Point        Defines alignment of the pivot point (or, element's position) relative to element's rendering area. The pivot point sets the center of element's rotation and scale directions.                stAlig..         
Visible        Defines whether the element is visible                Boolean         
Rotation        Rotation angle in degrees                Double         
Transparent Color        The color of the original pixels of rendered content that will be set as transparent                stColor         
Transparent Tolerance        Tolerance ratio for choosing colors that become transparent. Zero means that effect is not applied, 1 denotes that all colors will become trasparent                Int32         
Color Mask        Produces 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 dont change the original pixels                stColor         
Opacity        Opacity of the rendered content                Int32         
Contrast        Contrast of the rendered content                Int32         
Brightness        Brightness the rendered content                Int32         
Saturation        Saturation of the rendered content                Double         
Pixelation        Pixelation of the rendered content                Int32         
Blurring        The radius used in the gaussian blur of rendered content, as a pixel-based factor. The default is 0 which means no blurring.                Int32         
Scrambling                        Double         
Scrambling Grid Size        Defines a size of the scrambling grid                clSize         
Positional Jitter
Reset Jitter Now        Runtime command that resets the positional jitter.                Boolean         
Current Jitter        Returns the current jitter                clPoint         
Jitter Range        Defines a possible range for the random jitter. The range is centered to the position of the element.                clSize         
Test Jitter        Click to test the current jitter                Boolean         
Is Enabled        If set to false the element is completely omitted when the experiment is run                Boolean         
Title        Title of the element                String         

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.