1. A method to mark a region of interest in a graphical presentation, the method comprising: determining a first shape to define the region of interest, the first shape being positioned to include a first point in the graphical presentation; detecting selection of a second point in the graphical presentation, the second point not being associated with a boundary defining the first shape; and reshaping the first shape toward the second point to form a second shape to redefine the region of interest, the reshaping being performed in response detecting the selection of the second point.