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2. LINE ATTRIBUTES
Basic attributes of a straight line segment are its type,
its width and its color.
In some graphics packages, lines can also be displayed
using selected pen or brush options.
Line Type:
Line-type attribute include solid lines, dashed lines ,
and dotted lines.
3.
4. To set line type attributes in a PHIGS application program ,
a user involves the function
setLinetype( lt)
where parameter lt is assigned a positive integer value.
Line width:
A line-width options depends on the capabilities of
the output device. A heavy line on a video monitor could be
displayed as adjacent parallel lines, while a pen plotter
might require pen changes.
We set the line-width attribute with the command:
setLinewidthscaleFactor (l w)
5. There are three differents line cap they are
Butt cap
Round cap
Projecting square cap
Butt cap:
One kind of line cap is the butt cap obtained by adjusting
the end positions of the component parallel lines so that the thick
line is displayed with the square end of the thick line has slope -
1/m.
Round cap:
Another line cap is the round cap obtained by adding a
filled semicircle to each butt cap. The circular are centered on the
line endpoints and have a diameter equal to the line thickness.
Projecting square cap:
Extend the line and add buttcap.
6.
7. Displaying thick lines using horizontal and vertical
pixel spans.
Three possible methods for smoothly joining two line
segments.
A miter join is accomplished by extending the outer
boundaries of each of the two lines until meet.
A round join is produced by capping the connection
between the two segment with a circular boundary
whose diameter is equal to the line width.
Diameter = line width
8. A bevel join is generated by displaying the line with
butt caps and filling in the triangular gap where the
segments meet. If the angles between two connected
line segments is very small.
9. Pen and Brush
Lines can be displayed with pen or brush selections.
Options in the category include shape, size, an
patterns.
Some possible pen or brush shapes
10.
11.
12. Line Color
When system provides color(or intensity) options, a
parameter giving the current color index is included in
the list of system- attribute values.
A polyline routine display a line in the current color by
setting this color value in the frame buffer at pixel
loctaions along the line path using the setpixel
procedure.
We set the line color value in PHIGS with the function
setPolylineColourIndex(lc)
