Display processing unit for drawing vectors

Details Display processing unit for drawing vectors Display processing unit for drawing vectors

1976-10-01

1977-11-01

Ruggiero, Joseph F.

Boots, shoes, and leggings

315367, 340324M, 364607, G06F 1520, H01J 2970

Patent

active

040567133

ABSTRACT:
A high speed display processing unit (DPU) for displaying vectors on a cathode ray tube is disclosed. Each vector to be displayed is classified as to whether it is virtual, visible or both. If the displayed vector is partially visible, a digital section of the DPU calculates the length of the visible portion of the vector. Prior to drawing the vector, the digital section determines the major axis of the vector and its tangent. Each of the above values is provided to an analog section of the DPU which then draws at a constant velocity the visible vector. The DPU also includes circuitry for scaling, offset calculations and light pen hits.

REFERENCES:
patent: 3539860 (1970-11-01), Max et al.
patent: 3582705 (1971-06-01), Waller et al.
patent: 3614743 (1971-10-01), Ruben
patent: 3639736 (1972-02-01), Sutherland
patent: 3649819 (1972-03-01), Waller

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