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DCL:GRPH2:UDPACK: Contour Routines: Explanation of Subroutines

8.2.5 UDSCLV

1.

Function

Specifies all of the attributes for a contour line and sets a single contour level.

2.

Call

CALL UDSCLV(ZLEV,INDX,ITYP,CLV,HL)

3.

Explanation of Parameters

ZLEV	(R)	The value of a contour level.
INDX	(I)	The line index of a contour line.
ITYP	(I)	The line type of a contour line.
CLV	(C*(*))	The label for the contour line.
HL	(R)	The height of the label. (Units in VC). When HL≤0, no labels are drawn.

4.

Notes

(a)

UDGCLA and UDGCLB call this routine internally. When you wish to draw auxiliary lines, call UDGCLA and UDGCLB before calling this routine to add an extra contour level.

(b)

The length of the label (CLV) must be shorter than 8.

(c)

The number of contour levels currently set can be inquired with

CALL UDQCLN(NLEV).

(d)

The attributes of the NLth contour level can be inquired with

CALL UDQCLV(ZLEV,INDX,ITYP,CLV,HL,NL).

Information concerning the contour level is added as they are set by UDSCLV, so the values of the contour levels inquired by UDQCLV are not necessarily in ascending order.