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DCL:GRPH1:SGPACK: User Interface:Explanation of Subroutines: Normalization Transformation

2.5.2 SGSWND/SGSSIM/SGSMPL

1.

Function

Sets the parameters for normalization transformation.

2.

Call

CALL SGSWND(UXMIN,UXMAX,UYMIN,UYMAX)
CALL SGSSIM(SIMFAC,VXOFF,VYOFF)
CALL SGSMPL(PLX,PLY,PLROT)

3.

Explanation of Paramters

UXMIN,UXMAX,UYMIN,UYMAX	(R)	The window. See Section 1.4.
SIMFAC	(R)	The scaling factor for similar transformation. See Section 1.4.
VXOFF,VYOFF	(R)	The offset of the origin. When VXOFF, VYOFF are 0, the origin is set at the center of the viewport. See Section 1.4.
PLX,PLY,PLROT	(R)	The angle of rotation in the map projection. See Section 1.4.

4.

Notes

(a)

The current parameters can be inquired with

CALL SGQWND(UXMIN,UXMAX,UYMIN,UYMAX)
CALL SGQSIM(SIMFAC,VXOFF,VYOFF)
CALL SGQMPL(PLX,PLY,PLROT).

(b)

UXMIN!=UXMAX, UYMIN!=UYMAX.

Furthermore, in a logarithmic transformation, they must be defined in a positive range.

(c)

In a conic projection, the standard parallel is set by the parameters 'STLAT1' and 'STLAT2'managed by SGpGET/SGpSET.

(d)

These parameters become effective when SGSTRF is called.