Method and device for generating graphic data using a writing motion

Abstract

Using a writing implement model defined in the O-XYZ coordinate system a character or graphic form is generated on a writing plane model (O-XY plane) defined in the O-XYZ coordinate system. A control polygon for a character or graphical form to be generated is designed in advance in the O-XYZ coordinate system and a smooth writing motion model is generated using local basis functions that are weighted by the coordinate values of the respective vertices of that control polygon. The position component of the writing motion model represents variations in the position of a representative point of the writing implement model in the O-XYZ coordinate system with respect to time, and the posture component of the writing motion model represents time-variations of its inclination in the O-XYZ coordinate system with respect to the O-XYZ coordinate system. The writing implement model and the writing plane model intersect at a time, thereby forming a character segment. If character segments are generated at regular intervals between the start point and the end point of the writing motion, then the entire image of a character or graphic form will be obtained automatically.