Return function handle to current position constraint function
getPositionConstraintFcn is not recommended. With the new ROIs, use
DrawingArea property instead. For more information, see Compatibility Considerations.
fcn — Function handle
Function handle, returned as a handle. For more information, see Create Function Handle.
Version HistoryIntroduced in R2008a
getPositionConstraintFcn is not recommended
Starting in R2018b, a new set of ROI objects replaces the existing set of ROI objects. The new objects provide more functional capabilities, such as face color transparency. The new classes also support events that you can use to respond to changes in your ROI such as moving or being clicked. Although there are no plans to remove the old ROI objects at this time, switch to the new ROIs to take advantage of the additional capabilities and flexibility. For more information on creating ROIs using the new ROI functions, see Create ROI Shapes.
Using the new ROIs, you do not need to create and register a position constraint
function. You use the
DrawingArea property of the ROI to control
where you can draw and move an ROI. Therefore, there is no need for a function to
retrieve the current constraint function.
Update all instances of
|Discouraged Usage||Recommended Replacement|
This example creates a point ROI and uses the
imshow('cell.tif') h = impoint(gca,20,60); % Create a position constraint function. x = get(gca,'XLim'); y = get(gca,'YLim'); fcn = makeConstrainToRectFcn('impoint',x,y);; % Register the constraint function with the ROI. setPositionContraintFcn(h,fcn); % Retrieve the handle of the current position constraint function. fcn = getPositionContraintFcn(h);
With the new ROIs, there is no equivalent to getting a
handle to the current position constraint function. The new
ROIs use the
imshow('cell.tif') h = drawpoint(gca,'Position',[20 60]) [height width] = size(I); %Get image dimensions h.DrawingArea = [10,10,(width-20),(height-20)];