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A method is described to draw to the screen while resolving character conflict with current screen data by directly querying the hardware.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
74% of the total text.
Page 1 of 1
Screen Drawing by Display Query
A method is described to draw to the screen while resolving character conflict
with current screen data by directly querying the hardware.
This method allows the user to draw rectangular shapes on the screen (for a
keyboard layout, for example) without having to laboriously construct a
datastream by keying in each character. The input can be made extremely
modular and flexible, because all that's needed for input is: a) the size of the
box, and b) the screen coordinates in x and y where it is to be placed. These
sets of four numbers can be easily switched around in a data file as the design
process proceeds, because the usual problem of having to resolve the conflict
between a line-drawing character and the line that may already be at the
coordinate is done by the utility, not by the designer. Shapes can be placed on
the screen without regard for the contiguous shapes that may proceed or
The method also accomplishes the resolution of conflicting drawing
characters by using the existing character at a position and the new character to
be placed there as the indexes into a two-dimensional array. The cell so indexed
contains the hex value of the third character which is a combination of the
contending characters. Information about the character that may already be on
the screen at a coordinate is not maintained in any utility internal buf but rather is
gathered fresh, directly from the screen itself, by use of a special ut...