ROI Interaction

• rect. Roi mode allows rectangular regions of interest to be selected for processing. The button functions are:

  left down   : Choose upper left of region.
  
  left drag   : Drag to lower right corner of region.
  
  left up     : set roi.
  
  middle down : toggles display of current roi.
  
  right down  : Display the current roi.
  

• poly. Roi mode allows polygonal regions of interest to be selected for processing. The button functions are:

  left down   : Add new point to polygon.
  
  middle down : Close and display polygon.
  
  right down  : Start new polygon.
  

• point. Roi mode allows polygonal regions of interest to be edited. The button functions are:

  left down   : move nearest point on polygon.
  
  middle down : delete closest point on polygon.
  
  right down  : add new point to polygon and join to the two closest.
  

• global. Roi mode allows polygonal regions of interest to be modified. The button functions are:

  left down   : translate polygon.
  
  middle down : scale polygon.
  
  right down  : rotate polygon.