Graphics generator

Details Graphics generator Graphics generator

G - Physics

09

G

375/15

G09G 1/00 (2006.01) G09G 1/10 (2006.01)

Patent

CA 1082824

GRAPHICS GENERATOR Abstract of the Disclosure A graphics generator responds to signals defining a pattern to be displayed. The pattern comprises a plurality of pattern segments each of which may be a vector, conic or alpha numeric character. The graphics generator produces digital signals which are capable of driving a display through an A/D converter to produce a visual representation of the desired pattern segment. The pattern segment is broken up into a plurality of strokes of constant length regardless of orientation. Chaining the strokes on the display thus produces the desired pattern. An input signal defining a vector defines both the length and the orientation of the vector and these quantities are stored in length and orientation registers, respectively. The orientation signal is employed as an address into a sine/cos memory to derive stroke com- ponents in an orthogonal coordinate system which are then added to a beginning position of the stroke to produce the stroke end point. At the same time, a counter containing a quantity representative of the length of the desired vector is decremented. Repeating this process produces a series of digital signals representing strokes of constant length which can drive a display to produce the desired vector. Conics are produced in much the same manner except that the orientation register is incremented by a predetermined quantity for each cycle (or once in a determined number of cycles) thereby producing strokes whose orientation changes at a constant rate. Characters can be written at any desired orientation, by accessing a character definition memory storing signals representative of a plurality of pattern segments defining the particular character.

308726

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