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SUBROUTINE CONLIN(XD,YD,ZD,NT,IWK,WK)
C
C +-----------------------------------------------------------------+
C | |
C | Copyright (C) 1986 by UCAR |
C | University Corporation for Atmospheric Research |
C | All Rights Reserved |
C | |
C | NCARGRAPHICS Version 1.00 |
C | |
C +-----------------------------------------------------------------+
C
C
C
C THIS ROUTINE GENERATES THE COORDINATES USED IN A LINEAR INTERPOLATION
C OF THE TRIANGLES CREATED FROM IRREGULARLY DISTRIBUTED DATA.
C
C INPUT
C XD-X INPUT COORDINATES]
C YD-Y INPUT COORDINATES
C ZD-Z VALUE AT INPUT X,Y
C NT-NUMBER OF TRIANGLES GENERATED
C IWK-LIST OF TRIANGLE POINTS, RELATIVE TO XD,YD
C GROUPED 3 PER TRIANGLE I.E. TRIANGLE 1 IWK(1,2,3),
C TRIANGLE 2 IWK(4,5,6) ETC.
C
C OUTPUT
C WK ARRAY OF COEFICENTS FOR LINEATION FORMUALS
C GROUPED 3 PER TRIANGLE
C POINTS ARE (TRI-1)*3 + 1,2,3
C
DIMENSION IWK(1),WK(1),XD(1),YD(1),ZD(1)
C
SAVE
C
C LOOP FOR ALL TRIANGLES
C
DO 1000 ITRI = 1,NT
C
C GET THE POINTS OF THE TRIANGLE
C
IPOINT = (ITRI-1)*3
IP1 = IWK(IPOINT+1)
IP2 = IWK(IPOINT+2)
IP3 = IWK(IPOINT+3)
C
C GET THE VALUES AT THE TRIANBGLE POINTS
C
X1 = XD(IP1)
Y1 = YD(IP1)
Z1 = ZD(IP1)
X2 = XD(IP2)
Y2 = YD(IP2)
Z2 = ZD(IP2)
X3 = XD(IP3)
Y3 = YD(IP3)
Z3 = ZD(IP3)
C
C COMPUTE THE INTERPLOATING COEFICIENTS
C
WK(IPOINT+1) = (Y2-Y1)*(Z3-Z1)-(Y3-Y1)*(Z2-Z1)
WK(IPOINT+2) = (X3-X1)*(Z2-Z1)-(X2-X1)*(Z3-Z1)
WK(IPOINT+3) = (X3-X1)*(Y2-Y1)-(X2-X1)*(Y3-Y1)
C
1000 CONTINUE
C
RETURN
END
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