Method of Correlating on Areas in an Interactive Display System
Original Publication Date: 1986-Oct-01
Included in the Prior Art Database: 2005-Mar-09
The method of correlating straight lines in an interactive display system described in European Patent Application EP-A-0163872, published December 11, 1985, is extended to provide for correlation on areas defined by boundary lines. By using the method of EP-A-0163872, it can be determined whether any of the boundary lines intersects a selected rectangular window. If so, then the defined area must intersect the window. If not, however, the area may be complex and intersect the window even though the boundary lines do not. Thus, boundary lines 2 forming a square (Fig. 1) may surround the window 4 so that the area intersects, or an annular area between two sets of square boundary lines 6 and 8 (Fig. 2) may not.