One or more polygons. Options for border and solid or transparent fill also allow polygonal frames. See also element type rectangle if you just wants rectangles.

(Transparency artifacts)

In the unusual case that you draw multiple polygons in the same element and they overlap and have transparency, (properties color, borderColor below), you need to set backColor = <cds>"opaque"<cds> for accurate display.

▸ Object ends on its own?

"Ends on its own" means ends automatically at that point. If an element can end on its own, you don't need to set end conditions for it in property end (unless you want it to maybe end earlier).

No—runs until any condition you set in property end.

Input properties

Adjustable properties

You can vary or allow the subject to adjust the following properties of an object of this type when it's running. If you need to make other properties adjustable, you can edit the element type code—see Element Type Programming Manual.

Adjustable properties

Adjustable properties





No default

An n×2 matrix with rows corresonding to [x y] coordinates for vertexes of the polygon (deg). Coordinates are relative to element position which you can set in position (default relative to screen center). Vertexes are connected by lines in the order they appear in the matrix.

Or if you want to show multiple polygons at the same time, use a cell array with each cell containing a separate matrix. This is more efficient than using multiple polygon elements. Polygons are also layered front to back in the order you specify them. If you show multiple polygons then for each of the properties below you can set one value for all of them, or you can set different values for different polygons using a vector or matrix (see property).


Default: white

A 1×3 RGB vector with numbers between 0–1 setting fill color. You can also use a 1×4 RGBA vector to give the fill transparency, and set A = 0 for no fill. Or an n×3/4 matrix for different colors/transparencies for different polygons.


Default: borderWidth = no border
Default: borderColor = white

borderWidth is a number (deg). Or a vector for different border widths for different polygons. 0 = no border.

borderColor is a 1×3 RGB vector with numbers between 0–1 setting border color. You can also use a 1×4 RGBA vector to give the border transparency. Or an n×3/4 matrix for different border colors/transparencies for different polygons.

Input properties all visual elements have


Input properties all adjuster elements have


Input properties all objects have


Record properties

PsychBench uses record properties to record information during experiments. You can't set record properties but you can see them in experiment results using input property report.