how do i set drawrectangle to have a specific increment only?

I am trying to use drawrectangle

but what i want is the drawrectangle to have a specific increment ie: 0.5, 1.0...

but when i am using drawrectangle, after dragging to a different shape, the length, width, x coordinate and y coordinate will have some values such as

ROI moved current position: [3.50552486187845 3.89719626168224 5 5]

the values above are taken via a listener

instead of the above values, i want the values of the drawrectangle to be set as

ROI moved current position: [3.5 3.5 5 5] increments of 0.5

is that possible?

can it be done in the listener function?

Answer 1

[Sylvain]

you can set the property "Position" of an existing rectangle:

A=drawrectangle; %draw a rectangle
A.Position=[0.5 0.2 0.35 0.2] %modigy the position

Or you can set this property directly:

B= drawrectangle("Position",[3.5 3.5 5 5])

you can resize the axes to make it visible:

set(gca,"XLim",[0 6],"YLim",[0 6])