Method and system for ink data generation, ink data rendering, ink data manipulation and ink data communication

A computer configured to be used with a position detection sensor which detects a position indicated by a pointer, the computer being loaded with computer-executable instructions to execute steps comprising:

• storing ink data in a memory device, the ink data including one or more stroke data which respectively include control points for generating a pre-existing path formed of curve segments according to a defined curve interpolation algorithm, and which respectively include a start parameter indicative of a start point within a starting curve segment of the curve segments at which display of the pre-existing path starts and an end parameter indicative of an end point within an ending curve segment of the curve segments at which display of the pre-existing path ends;
• after storing the ink data in the memory device, determining whether a manipulation path formed of a group of coordinates data obtained by the position detection sensor intersects the one or more pre-existing paths of the one or more stroke data, respectively;
• and
• with respect to a first stroke data, which is the stroke data determined to include the pre-existing path that is intersected by the manipulation path:
• deriving anew at least one of the start parameter and the end parameter based on the coordinates data of an intersection between the pre-existing path of the first stroke data and the manipulation path, and
• without deriving the control points anew, generating a second stroke data, which includes at least one of the start parameter and the end parameter that are generated anew and a portion of the control points.