How to Make a Program of 2-Dimentional Computer Graphics for Learnning : Rang from Programming Basic Routines to Drawing a Picture

神奈川県茅ヶ崎市 A raster scan type of display is suitable for the begginers' learning computer graphics (CG). This type of display generates a many dots on the screen, what are called "picsels". As a result of assembling picsels, a picture or graph is formed on the screen. But the biginners hardly know the theory of raster scan graphics. It is reported in this paper that the two-dimensional CG program is developed to help the beginners understand easily this theory. Both using and understanding the program will give them a knowlegde of process of transforming a picture into a set of picsels by function such as difinition of picture, geometry transformation, window-viewport transformation, clipping, generation of line and so on