Graphics Reference
In-Depth Information
Parameter Name Type Description
æææææææææææææææææææææææææææææææææææ
1
CTYPE Integer
Spline type
1 = linear
4 = Wilson-Fowler
2 = quadratic
5 = modified Wilson-Fowler
3 = cubic
6 = B-spline
2
H
Integer
Continuity with respect to arc length at breakpoints
1 = curve is continuous and has slope continuity
2 = curve is continuous and has both slope and
curvature continuity
3
NDIM
Integer
2 = planar
3 = non-planar
4
N
Integer
Number of segments
5
T(1)
Real
Break points of piecewise polynomial
.
5+N
T(N+1) Real
6+N
AX(1) Real
x-Coordinate polynomial
7+N
BX(1)
8+N
CX(1)
9+N
DX(1)
10+N
AY(1)
.
y-Coordinate polynomial
.
13+N
DY(1)
14+N
AZ(1)
.
z-Coordinate polynomial
.
18+N
AX(2)
.
.
6+13N
TPX0
.
Terminate point x-value
Terminate point x-value of 1
st
derivative
.
TPX1
.
Terminate point x-value of 2
nd
derivative/2!
TPX2
Terminate point x-value of 3
rd
derivative/3!
TPX3
TPY0
.
Terminate point y-value
.
.
Figure C.7.
Parameter data for parametric spline curve entity #112.
()
==
CTYPE
=
31
,
H
=
,
NDIM
=
25
,
N
=
,
T i
i i
,
, ,..., ,
15
(
()
()
()
()
)
=
(
)
AX
1
,
BX
1
,
CX
1
,
DX
1
3 0 8722851 0000003576279
. ,.
,.
, .
-
01331125
,
(
()
()
()
()
)
=
(
)
AY
1
,
BY
1
,
CY
1
,
DY
1
3 0
. ,
-
0 1481045
.
E
+
01
,
-
0 2384186
.
E
-
06 3784813 0
,.
,
,
M
(
)
=
(
)
TPZ
0
,
TPZ
1
,
TPZ
2
,
TPZ
3
. ,. ,. ,.
0000
.
In other words the entity defines a cubic planar spline that is continuous and has slope
continuity at the six breakpoints T(i) = i, i = 0, 1,..., 5.
