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Program and apparatus for displaying graphical objects

  • US 20030206166A1
  • Filed: 11/06/2001
  • Published: 11/06/2003
  • Est. Priority Date: 06/08/2001
  • Status: Active Grant
First Claim
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1. A program product, for use with a computer, for drawing and displaying an image of given objects in a three-dimensional virtual space, the program product causing the computer to perform the steps of:

  • (a) determining which movement mode to use, according to a given user action;

    (b) calculating eye point coordinates and a line-of-sight vector, according to the given user action and the determined movement mode;

    (c) when the determined movement mode is fixed up-direction mode, setting an up direction of a projection plane to a predetermined direction;

    (d) when the determined movement mode is variable up-direction mode, determining the up direction of the projection plane according to predetermined rules;

    (e) performing a perspective transformation of the given objects onto the projection plane being oriented to the determined up direction, based on the determined eye point coordinates and line-of-sight vector, thereby creating an image of the given objects; and

    (f) displaying the created image.

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