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Forms are represented by the geometry objects Rectangle, Circle, Polygon, Wedge, and Line, which can be used to compose the mask positive and negative regions. All forms, except Polygon, are presented by two 2D points each in image coordinate system. Polygon is presented by the N 2D points, where N is a number of vertexes. All forms behave about the same way depending on Mode, as explained below.

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Add is an input mode for forms. All forms, except Polygon, are presented by two 2D points each on image coordinate system. Input method for these forms is the same;
Input method for Rectangle, Circle, Wedge, and Line: in mode Add click-drug-release the left mouse button. Two points will be defined for for each form are defined by the click and release positions of the mouse. Polygon is presented by the N 2D points, where N is a number of vertexes. The
Input method for Polygon: the N-1 points are entered by the left mouse button click, while the Nth point is indicated by the right mouse button click, which closes the polygon.

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