Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1983-06-13
1985-07-16
Curtis, Marshall M.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
340735, 340739, G09G 116
Patent
active
045299781
ABSTRACT:
An image of a two-dimensional matrix to be displayed is formed in a refresh memory entirely by the execution of sequences of "pattern modulated" line segments termed "vectors". Two sequences of vectors are generated for writing each character cell into the refresh memory. The first, or outer, sequence provides the starting position and pattern for each of the vectors in a second, or inner, sequence. The inner and outer vectors are generated, respectively by inner and outer vector generators. Both inner and outer vectors are drawn from a current, starting position in a selected direction to an end point position a given length away, based upon the contents of definable registers in the image generating hardware. One of the registers identifies the data to be written into the successive pixel locations in memory selected by the vector generators during the writing of each line segment.
Characters are drawn by breaking the two-dimensional character pattern into a set of nested one-dimensional patterns, which are related to columns and rows. Each row of the character pattern is drawn by generating an inner vector at an angle and length selected for the cell. The vector length is set equal to the width of the character and other variables are set appropriately to generate the desired angle. A second vector generating procedure is used to create a vector which, instead of providing illumination points, provides the starting (x,y) location to be used for drawing each successive inner vector in the matrix. This vector, too, has a starting location, length spatial orientation, and a pattern. The angle of the outer vector can be set independently of the angle of the inner vector. The direction, repetition, and location of these sequences may be varied dynamically, creating the ability to vary the size, angular orientation and spacing of characters, as well as font, plus providing other text enhancements.
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Curtis Marshall M.
Digital Equipment Corporation
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