Method and apparatus for displaying a parametric curve

Details Method and apparatus for displaying a parametric curve Method and apparatus for displaying a parametric curve

1990-10-05

1994-02-15

Nguyen, Phu K.

395141, G06F 700

Patent

active

052874419

ABSTRACT:
In a method of drawing parametric curve on second-dimensional coordinate having discrete coordinate values, when rounding respective points on curve obtained by equal division in adjacent points, the nearest lattice point is not selected, but instead, if the incline value of this point is more than 1, an adjacent point containing integral X-coordinate is approximately computed, whereas if the incline value of this point is less than 1, an adjacent point containing integral Y-coordinate is approximately computed. Since specific lattice points nearest to the computed points are selected, smooth curve can be drawn without causing redundant point to occur at all. When executing linear interpolation, interpolation is executed by means of a straight line passing through the not-yet-rounded point without using such a line passing through the already rounded point. As a result, satisfactory linear interpolation very close to true curve can be achieved constantly.

REFERENCES:
patent: 5182795 (1993-01-01), Boutaud et al.
patent: 5214754 (1993-05-01), Okamoto et al.

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