EP0213316A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for displaying box cursors
Assignee: International Business Machines Corp
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Filing: 1986-07-01
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Granted: —
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Expires: 2006-07-01
Abstract
Abstract The present invention is to overcome the disappearance problem of overlapping box cursors that use especially cursors consisting of lines of identical width. According to the invention, one of at least two box cursors is displayed as a broken line while the other is displayed as either a full line or a broken line, wherein bit positions which are usable to store inverted bits for the broken line of the former cursor are different from those usable to store inverted bits for the broken line of the latter cursor.
Inventors
- 👤 Shigeo Tokuda
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 11:39
CPC Classifications
G; G09; G09G; G09G5/00; G09G5/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
204 words
A method for displaying at least two box cursors consisting of lines, especially of those having identical thickness, in a display apparatus having a screen on which a plurality of picture element (pel) points are defined in a matrix fashion and a storage means comprising a plurality of bit positions corresponding to said pel points for storing plural bits representing an image to be displayed, said method comprising the steps of: a) preparing a first mask consisting of a bit pattern which includes at least one bit 0 and at least one bit 1, and a second mask consisting of a bit pattern which has complementary relation with the bit pattern of said first mask; b) inverting bits at a group of bit positions in said storage means by using one of said first and second masks, said bit positions being selected according to a first position information designating a desired display position of a first box cursor on said screen; and c) inverting bits at a group of bit positions in said storage means by using the other mask, said bit positions being selected according to a second position information designating a desired display position of a second box cursor on said screen.
Claim 2
Independent Claim
204 words
A method for displaying at least two box cursors consisting of lines, especially of those having identical thickness, in a display apparatus having a screen on which a plurality of picture element (pel) points are defined in a matrix fashion and a storage means comprising a plurality of bit positions corresponding to said pel points for storing plural bits representing an image to be displayed, said method comprising the steps of: a) preparing a first mask consisting of a bit pattern which includes at least one bit 0 and at least one bit 1, and a second mask consisting of a bit pattern which has complementary relation with the bit pattern of said first mask; b) inverting bits at a group of bit positions in said storage means by using one of said first and second masks, said bit positions being selected according to a first position information designating a desired display position of a first box cursor on said screen; and c) inverting bits at a group of bit positions in said storage means by using the other mask, said bit positions being selected according to a second position information designating a desired display position of a second box cursor on said screen.
Claim 3
Dependent Claim
41 words
The method of Claim 1, wherein said step b) includes an operation for modifying said one mask according to said first position information and said step c) includes an operation for modifying said other mask according to said second position information.
Claim 4
Dependent Claim
157 words
The method of Claim 2, wherein the number of bits in each mask is n which is an integer larger than 1 and each position information includes coordinates (x, y) of a picture element (pel) point by which a predetermined corner of each box cursor to be displayed in an X-Y coordinate system is defined with respect to said screen; said steps b) and c) including an operation for inverting bits at bit positions corresponding to lines of each box cursor in the X direction by using said mask after rotating it in a predetermined direction by a number of bits determined by a residue Rx obtained by x ÷ n and an operation for inverting bits at bit positions corresponding to lines of each box corner in the Y direction by using said mask after rotating it in a predetermined direction by a number of bits determined by a residue Ry obtained by y ÷ n.
Claim 5
Independent Claim
194 words
A method for displaying at least two box cursors consisting of lines, especially of those having identical thickness, in a display apparatus having a screen on which a plurality of pel points are defined in matrix fashion and a storage means comprising a plurality of bit positions corresponding to said pel points for storing plural bits representing an image to be displayed, said method comprising the steps of: a) preparing a first mask consisting of a bit pattern which includes at least one bit 0 and at least one bit 1, and a second mask consisting of a bit pattern which includes bit 1 only; b) inverting bits at a group of bit positions in said storage means by using one of said first and second masks, said bit positions being selected according to a first position information designating a desired display position of a first box cursor on said screen; and c) inverting bits at a group of bit positions in said storage means by using the other mask, said bit positions being selected according to a second position information designating a desired display position of a second box cursor on said screen.
Claim 6
Independent Claim
194 words
A method for displaying at least two box cursors consisting of lines, especially of those having identical thickness, in a display apparatus having a screen on which a plurality of pel points are defined in matrix fashion and a storage means comprising a plurality of bit positions corresponding to said pel points for storing plural bits representing an image to be displayed, said method comprising the steps of: a) preparing a first mask consisting of a bit pattern which includes at least one bit 0 and at least one bit 1, and a second mask consisting of a bit pattern which includes bit 1 only; b) inverting bits at a group of bit positions in said storage means by using one of said first and second masks, said bit positions being selected according to a first position information designating a desired display position of a first box cursor on said screen; and c) inverting bits at a group of bit positions in said storage means by using the other mask, said bit positions being selected according to a second position information designating a desired display position of a second box cursor on said screen.
References Cited (Backward Citations)
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