Method of storing character in a display system

Details Method of storing character in a display system Method of storing character in a display system

G - Physics

09

G

375/21

G09G 1/10 (2006.01) G09G 1/16 (2006.01) G09G 5/24 (2006.01)

Patent

CA 1224290

METHOD OF STORING CHARACTERS IN A DISPLAY SYSTEM Abstract In a method of storing characters in a display system having a display device with an orthogonal matrix of addressable points, each character is represented as a succession of strokes each constrained to lie in one of the eight fundamental directions of the matrix and, except for the first stroke, each starting at the end of the previous stroke. Each such stroke is stored in a binary coded form which includes a first binary number (direction code) defining the angular direction of the stroke, a second binary number (length code) defining a number of matrix steps from one addressable point to the next along the stroke in that direc- tion, and a third binary number (move/draw code) defining the visibility of the stroke. In order to facilitate character rotation by any multiple of 45° the direction code defining each fundamental direction corre- sponds to the addition modulo 2n of a binary constant to the direction code which defines the fundamental direction at 45° thereto in a given direction of rotation, where n is the number of bits in the direction code.

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