...
where text color piramcter
tc
specifies an allowable color code.
We can adj~~st text size by scaling theoverall dimensions (height
and
width)
of characters or by scaling only the character width. ...
a
curve,
ci\rcles
(or
markers), and text.
?hftesy
of
Wolfmrn
hrch,
Inc.,
The
Mah
of
Malhtica.J
Additional primitives available in graphics packages include cell arrays,
c...
... track of
which surface section is visible on each scan line. This works only
if
surfaces do
not cut through or otherwise cyclically overlap each other (Fig.
13- 11).
If
any kind
of cyclic ...
in
Chapter 14.
13- 1
1
CURVED
SURFACES
Effective methods for determining visibilit$ for objects with curved surfaces in-
clude ray-casting and octree methods. With ray casting, we calcu...
... focusing, deflection of the electron beam can be controlled either
with electric fields or with magnetic fields. Cathode-ray tubes are now commonl!.
constructed with magnetic deflection coils ...
Research Inc./NCSC;
Chris
Landreth,
NCSC;
and Dave
W,
NCSC.
Pollutant
SO,
is
plotted
as
a
blue surface, acid-rain deposition
is
a color plane on the
map
surface,
and
rain
conce...
...
geometric components of pictures. Additional output primitives that can be used
to construct a picture include circles and other conic sections, quadric surfaces,
spline curves and surfaces, polygon ... device inter-
face methods is given
in
the Computer Graphics Interface (CGI) system. And
the Computer Graphics Metafile (CGM) system specifies standards for archiv-
ing and tra...
... surface. Figure
14-60
shows a ray-traced scene containing multiple
objects and texture patterns.
Reducing Object-Intersection Calculations
Raysurface intersection calculations can account ... purity with
the chromaticity diagram.
C, . Color C, can then be represented as a combination of white light C and the
spectral color C, . Thus, the dominant wavelength of
C,
is
C, .
This...
...
and science had to rely on expensive and cumbersome equipment, advances
in
computer technology have made interactive computer graphics a practical tool.
Today,
we
find computer graphics used ... propcts.
1 -3
COMPUTER ART
Computer graphics methods
are
widely used
in
both
fine
art and commercial art
applications. Artists
use
a variety of computer methods, incl...