Abstract: According to the present invention, a solid model could be automatically generated with a feeling of sketch.When point sequence data inputted from a tablet are inputted in order to sketch a solid model, graphic recognition processing is performed. Next, a recognized graphic is subjected to automatic editing processing, and then a model generation plane for the graphic is generated. Next, a projection line for connecting a view point to a point on the tablet is generated in a coordinate system in a three-dimensional space. An intersection point between the generated model generation plane and the projection line is determined to derive edges, etc. Next, solid model data are derived by using the derived edges, etc., and the data are stored. The stored data (three-dimensional) are converted into two-dimensional coordinates, and they are displayed on the tablet.

Abstract: When a pattern is manually drawn on a tablet with an electronic pen, a computer executes a graphic processing to display on a CRT a geometrically defined pattern which best resembles the manually drawn pattern. Moreover, a pattern element is erased, divided or copied by memorizing a graphic processing command in advance in a manner to correspond to a predetermined pattern or operator and by manually drawing this operator on the tablet with the electronic pen.The pattern data can be inputted to the computer to display the pattern by the same operations as those for drawing on a paper with writing apparatus so that the pattern can be drawn on the basis of the human engineering without feeling any physical disorder.