| 摘要 |
PCT No. PCT/JP85/00108 Sec. 371 Date Oct. 31, 1985 Sec. 102(e) Date Oct. 31, 1985 PCT Filed Mar. 5, 1985 PCT Pub. No. WO85/04034 PCT Pub. Date Sep. 12, 1985.A graphic display method for transforming three-dimensional coordinate values (x, y, z) of an object to be displayed into coordinate values (X,Y) of a two-dimensional display coordinate system on a CRT display screen (DPS), and displaying a perspective view of the object on the CRT display screen (DPS) by using two-dimensional coordinate values obtained by the transformation. In the method, beta represents an angle between x and y axes among three-dimensional coordinate axes of the perspective view displayed on the CRT screen (where the counter-clockwise direction is taken as positive with the x axis serving as a reference), alpha represents the angle between the x axis and an X axis of a display coordinate system (where the counter-clockwise direction is taken as positive with the X axis serving as a reference), and (Xo,Yo) represent coordinate values of a three-dimensional coordinate origin (DRP) of the perspective view in the display coordinate system. A keyboard is provided with keys for incrementing and decrementing the angle alpha . The method has a step of increasing alpha by pressing the increment key or decreasing alpha by pressing the decrement key, and a step of transforming the three dimensional coordinate values into the display coordinate system (X-Y) by the formula <IMAGE> The perspective view of the three-dimensional object is displayed while it is rotated by using the coordinate values in the display coordinate system obtained by the transformation. |
