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Since graphic vector generators are relatively complex and costly, it is desirable to provide a simplified vector graphics capability to an alphanumeric display with a programmable character set feature.
English (United States)
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Character Graphics Using Programmable Character Font
Since graphic vector generators are relatively complex and costly, it is
desirable to provide a simplified vector graphics capability to an alphanumeric
display with a programmable character set feature.
Referring to the drawing, data from a data source 11 contains both
alphanumeric data applied to character data block 13 and graphic data applied to
vector data block 15. Assume that a 9 x 16 dot matrix format is employed for a
character and that both alphanumeric and graphic data are generated using a
horizontal scan technique. A mapped regeneration buffer 17 contains the coded
display data on a character-by-character basis with the screen, and the capacity
is increased by expanded buffer 19 to contain attribute data associated with the
characters. The output from character data block 13 is stored in the mapped
regeneration buffer 17, which may comprise a read/write random-addressable
memory (RAM), which in turn addresses the ROS character generator 21 via line 23.
Vector data representing the vector end point addresses are applied from
vector data source 15 to vector to character converter 20. Vector character
converter 20, either as device microcode or as a host program, produces the dot
pattern representing a specified vector using the Bresenham algorithm, and this
pattern is stored in discrete 9 x 16 blocks in the programmable character set
RAM 25 in the display device. Pointers for these RAM 25 blocks are...