Multiple Coordinates in System
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Publishing Venue
IBM
Related People
Abstract
In a display windowing system, an arithmetic sign used to determine the coordinate axis of reference. For positive x, y coordinates refer to left hand and edges and negative coordinates to right hand and top This permits fixing positions of display items to edges of a viewport which are independent of of size of viewport.
Multiple Coordinates in System
In a display
windowing system, an arithmetic sign used to
determine the coordinate axis of reference.
For positive x, y
coordinates refer to left hand and edges and negative coordinates to
right hand and top This permits fixing
positions of display items to
edges of a viewport which are independent of of size of viewport.
A viewport in
a window is a rectangular area through an
underlying scene, called a panel, is displayed.
A acts as a matrix
upon which fields are embedded. The
coordinate system defines the
positioning of these on the panel. Coordinate Systems
In most
windowing systems a panel will have either a based
coordinate system (in a row and column or a graphic coordinate system
in world coordinate units. The
screen-cell- based coordinate system
is as follows:
The top-left cell is a row 1 column 1.
Row coordinate values increase
downwards.
Column coordinate values increase to
the right.
The graphic coordinate system normally
specifies that
position
x=0, y=0 is at the bottom-left of the
panel.
X-coordinate values increase to the
right.
Y-coordinate values increase upwards.
Multiple Coordinate Systems (Fig. 1)
The above
coordinate systems do not use negative values,
negative values could be used to position fields the axes. However,
negative values can be exploited another way.
Fig. 1 shows that a
positive x coordinate related to the left, whereas a negative x
coordinate is to the right. If a
positive x coordinate increases,
the corresponding position moves to the right, being displaced from
the left-hand axis.
If a negative
x coordinate decreases, then the postion moves to
the left, being further from the right-hand axis. Similarly a
positive y relates to the bottom, and a negative y relates to the
top.
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