Patent
1989-08-31
1992-03-03
Herndon, Heather R.
395141, G06F 1563
Patent
active
050939050
ABSTRACT:
An inclined rectangular pattern generating system includes a lengthwise straight line generator coupled to receive inclined angle information for generating X- and Y- direction increment/decrement signals indicative of a coordinate change component between a dot being currently written into the memory and a dot into be next written to the memory, these dots being adjacent to each other and being included in a string of dots which form a lengthwise straight line in a parallel to a lengthwise side of the inclined rectangular pattern to be generated. There is also provided a widthwise straight line generator coupled to the inclined angle information for generating X- and Y- direction increment/decrement signals indicative of a coordinate change component between a starting dot of a lengthwise straight line being currently written into the memory and a starting dot of another lengthwise straight line to be next written to the memory. A dot controller is coupled into the lengthwise and widthwise straight line generators and operates in such a manner that when the lengthwise straight line generator indicates a coordinate change both in X- and Y- directions and when the widthwise straight line generator indicates a coordinate change both in X- and Y- directions, the dot controller causes the dot information writing circuit to write a dot information into a memory location of a display memory corresponding to a coordinate which changes only either in the X-direction or in the Y-direction from the coordinate into which the dot information has been written just before.
Herndon Heather R.
NEC Corporation
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