Importance

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Abstract

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 (X.sub.o,Y.sub.o) 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 ##EQU1## 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.

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First Claim