Graphics Reference
In-Depth Information
Entity Number 106.
The copious data entity has multiple meanings depending on
its form number. Figure C.8 describes some of the fields of its parameter data. When
the form number is 1, 2, or 3, then the IP field takes on the same value and they both
have the same meaning. Its data starts in parameter data line number 70 and consists
of 3 lines altogether. In our case
form number ==
IP
2
,
N
=
5
,
and we have five data points
(
) (
) (
)
(
)
(
)
034 01 03401 034101 0341 01 034 01
, , ., , ,., , .,., , ., ., , , ..
-
-
-
How the points are interpreted is usually determined by the entity that refers to this
one as we shall see when we discuss the next entity.
Entity Number 108.
This is the plane entity. There is one parameter data line for
it and that line has number 73. Figure C.9 describes some, but not all, parameters
that can be associated to it. In our case we have
Parameter Name Type Description
ææææææææææææææææææææææææææææ
1
IP
Integer
Interpretation flag
IP = 1 x, y pairs, common z
IP = 2 x, y, z triples
IP = 3 x, y, z coordinates
i, j, k vector coordinates
2
N
Integer
Number of n-tuples
Case IP = 2:
3 Æ 2+3N
Sequence of x, y, z tuples of data values
Figure C.8.
Partial parameter data for copious entity #106.
Parameter Name Type Description
ææææææææææææææææææææææææææææææææææ
1
A
Real
Corresponds to plane
2
B
Real
3
C
Real
Ax + By + Cz = D
4
D
Real
5
DE
Pointer
Pointer to directory entry of closed curve entity or 0
Figure C.9.
Partial parameter data for plane entity #108.
