A variant of the viewfinder displaying only the four corners of the scanning area.
Optional
Readonly
The radius of the viewfinder's corners.
Default is 10.0
The color of the viewfinder corner's outlines.
Default is "#FFFFFFFF"
The width of the viewfinder corner's outlines.
Default is 3.0
A variant of the viewfinder displaying only the four corners of the scanning area.