Patent ID: 8255441

Claim:
A figure data verification apparatus comprising: a first sorting part configured to input design data and sort figures included in the design data to at least one arbitrary-angle figure having at least one angle not being an integral multiple of 45 degrees and to at least one non-arbitrary-angle figure all angles of which are integral multiples of 45 degrees; a second sorting part configured to input writing data converted from the design data, and sort figures included in the writing data to at least one first figure corresponding to the at least one arbitrary-angle figure and to at least one second figure corresponding to the at least one non-arbitrary-angle figure; a first operation part configured to perform an exclusive OR operation between data of the arbitrary-angle figure and data of the first figure; a second operation part configured to perform an exclusive OR operation between data of the non-arbitrary-angle figure and data of the second figure; a first removal part configured to remove a figure of a size smaller than a first allowable error value from at least one figure produced as a result of the exclusive OR operation between the data of the arbitrary-angle figure and the data of the first figure; and a second removal part configured to remove a figure of a size smaller than a second allowable error value from at least one figure produced as a result of the exclusive OR operation between the data of the non-arbitrary-angle figure and the data of the second figure.