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公开(公告)号：JPH04116593A
公开(公告)日：1992-04-17
申请号：JP22681290
申请日：1990-08-30
Applicant: IBM
Inventor： HIDAKA KAZUYOSHI , AKAISHI MASANORI
Abstract: PURPOSE: To trace a graphic by a cursor without requiring previous instructions for a trace starting point and a tracing direction by determining a point on a display screen in accordance with an inputted signal, determining a point on a graphic object close to the determined screen position and displaying a cursor on the determined object point. CONSTITUTION: The cursor movement control device consists of a control device 1, an arithmetic unit 2, a display control device 3, a display 4, a position coordinate display device 9, a ratio display device 10, a data storage area 11, a graphic object selecting device 12, and so on. A signal for indicating a certain position on the display screen is inputted, one of continuous segments displayed on the screen and a point Qi on the screen are determined in accordance with the inputted signal, a point Pi obtained by projecting the point Qi to the segment is determined and a cursor is displayed on the point Pi. Consequently a graphic can be traced by the cursor without requiring the previous instructions of a trace starting point and a tracing direction.
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公开(公告)号：DE69124324D1
公开(公告)日：1997-03-06
申请号：DE69124324
申请日：1991-08-09
Applicant: IBM
Inventor： HIDAKA KAZUYOSHI , AKAISHI MASANORI
Abstract: Apparatus for moving a cursor while constrained on a selected graphics object displayed on a display screen (4) comprises a mouse (6) or similar device for entering a signal for pointing to a position on the display screen (4); means (5) for determining a point on the display screen (4) in response to the signal entered by the mouse (6); means (1,2) for determining a point on the graphics object which is near the point determined by means (5); and means (3) for displaying the cursor at the point determined by means (1,2). Graphics objects can thus be tracked by means of a cursor without requiring the specification of points or directions prior to tracking thereby providing the user with direct control of the movement of a cursor constrained onto graphics object.
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公开(公告)号：CA2047887C
公开(公告)日：1998-12-22
申请号：CA2047887
申请日：1991-07-25
Applicant: IBM
Inventor： HIDAKA KAZUYOSHI , AKAISHI MASANORI
Abstract: The constraint mode provided by this invention allows a user to move a cursor of a pointing device, such as a mouse cursor, just along lines and curves on a graphics screen. The user can select a point located on lines and curves correctly even though the pointing device is moved quite roughly. The user can also select a point that divides a segment by an arbitrary ratio, or a point that divides the segment into a plurality of equal parts. The method basically comprises the steps of entering a signal for pointing to a position on a display screen and determining a point on the display screen in response to the entered signal. A point is then determined on the graphics object near to that point determined on the display screen. A cursor is thus displayed at the determined point on the graphics object.
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公开(公告)号：CA2047887A1
公开(公告)日：1992-03-01
申请号：CA2047887
申请日：1991-07-25
Applicant: IBM
Inventor： HIDAKA KAZUYOSHI , AKAISHI MASANORI
Abstract: Apparatus for moving a cursor while constrained on a selected graphics object displayed on a display screen (4) comprises a mouse (6) or similar device for entering a signal for pointing to a position on the display screen (4); means (5) for determining a point on the display screen (4) in response to the signal entered by the mouse (6); means (1,2) for determining a point on the graphics object which is near the point determined by means (5); and means (3) for displaying the cursor at the point determined by means (1,2). Graphics objects can thus be tracked by means of a cursor without requiring the specification of points or directions prior to tracking thereby providing the user with direct control of the movement of a cursor constrained onto graphics object.
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