Fast point/line correlations in graphic entities

Details Fast point/line correlations in graphic entities Fast point/line correlations in graphic entities

1986-11-03

1988-06-28

Caldwell, Sr., John W.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340723, G09G 116

Patent

active

047542675

ABSTRACT:
Graphics display system having a moving cursor, such as a cursor, for selecting a displayed entity with the capability of determining which one of several lower level entities in the vicinity of the cursor is to be selected. The correlation of a cursor with a entity intended to be selected is performed by calculating an index that does not represent the actual distance, which is time consuming, but rather represents a value, more quickly calculated, such that the size order among the indices is the same as the size order of the distances they represent.

REFERENCES:
patent: 3997891 (1976-12-01), Iwamura et al.
patent: 4587520 (1986-05-01), Astle
Bantz and Hatfield, "Correlation of Coded Graphic Representations with Cursor Position", IBM Technical Disclosure Bulletin, vol. 20, No. 2, 1977, pp. 806-807.

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