Apparatus and method for identifying next matrices for vector dr

Details Apparatus and method for identifying next matrices for vector dr Apparatus and method for identifying next matrices for vector dr

1987-09-08

1990-02-27

Brigance, Gerald

Communications: electrical

Land vehicle alarms or indicators

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

340747, G09G 114

Patent

active

049049941

ABSTRACT:
A system to convert vector data to pixel data for drawing a vector on display screen that is divided into groups of pixels (matrices) having selected numbers of pixels in the x and y coordinate directions. The vector data is processed to define the slope of the vector and the number of matrices in the x and y directions the vector extends through. Counters are set to such numbers. Starting with the first matrix in which one end of the vector is located, a circuit defines which pixels must be enabled to draw the vector through that matrix. According to the location of the vector relative to decision points in the first matrix, a circuit identifies the next matrix through which the vector extends and causes the counter to count. This continues until the last matrix is identified and the pixels therein are enabled. An additional circuit masks those pixels, if any, in the first and last matrices that are beyond the end of the vector.

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