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|
*=======================================================================
*
* WCSLIB 7.4 - an implementation of the FITS WCS standard.
* Copyright (C) 1995-2021, Mark Calabretta
*
* This file is part of WCSLIB.
*
* WCSLIB is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* WCSLIB is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with WCSLIB. If not, see http://www.gnu.org/licenses.
*
* Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
* http://www.atnf.csiro.au/people/Mark.Calabretta
* $Id: tprj2.f,v 7.4 2021/01/31 02:24:52 mcalabre Exp $
*=======================================================================
PROGRAM TPRJ2
*-----------------------------------------------------------------------
*
* TPRJ2 tests projection routines by plotting test graticules using
* PGPLOT.
*
*-----------------------------------------------------------------------
INTEGER J
DOUBLE PRECISION PV(0:29)
DOUBLE PRECISION PI
PARAMETER (PI = 3.141592653589793238462643D0)
*-----------------------------------------------------------------------
WRITE (*, 10)
10 FORMAT (
: 'Testing WCSLIB spherical projection routines (tprj2.f)',/,
: '------------------------------------------------------')
DO 20 J = 0, 29
PV(J) = 0D0
20 CONTINUE
* PGPLOT initialization.
CALL PGBEG (0, '/null', 1, 1)
* Define pen colours.
CALL PGSCR (0, 0.00, 0.00, 0.00)
CALL PGSCR (1, 1.00, 1.00, 0.00)
CALL PGSCR (2, 1.00, 1.00, 1.00)
CALL PGSCR (3, 0.50, 0.50, 0.80)
CALL PGSCR (4, 0.80, 0.50, 0.50)
CALL PGSCR (5, 0.80, 0.80, 0.80)
CALL PGSCR (6, 0.50, 0.50, 0.80)
CALL PGSCR (7, 0.80, 0.50, 0.50)
CALL PGSCR (8, 0.30, 0.50, 0.30)
30 FORMAT(/,A,' projection')
40 FORMAT(/,A,' projection',/,'Parameters:',5F12.5,/,5F12.5)
* AZP: zenithal/azimuthal perspective.
PV(1) = 2D0
PV(2) = 30D0
WRITE (*, 40) 'Zenithal/azimuthal perspective', (PV(J), J=1,2)
CALL PRJPLT ('AZP', 90, -90, PV)
* SZP: zenithal/azimuthal perspective.
PV(1) = 2D0
PV(2) = 210D0
PV(3) = 60D0
WRITE (*, 40) 'Slant zenithal perspective', (PV(J), J=1,3)
CALL PRJPLT ('SZP', 90, -90, PV)
* TAN: gnomonic.
WRITE (*, 30) 'Gnomonic'
CALL PRJPLT ('TAN', 90, 5, PV)
* STG: stereographic.
WRITE (*, 30) 'Stereographic'
CALL PRJPLT ('STG', 90, -85, PV)
* SIN: orthographic.
PV(1) = -0.3D0
PV(2) = 0.5D0
WRITE (*, 40) 'Orthographic/synthesis', (PV(J), J=1,2)
CALL PRJPLT ('SIN', 90, -90, PV)
* ARC: zenithal/azimuthal equidistant.
WRITE (*, 30) 'Zenithal/azimuthal equidistant'
CALL PRJPLT ('ARC', 90, -90, PV)
* ZPN: zenithal/azimuthal polynomial.
PV(0) = 0.05000D0
PV(1) = 0.95000D0
PV(2) = -0.02500D0
PV(3) = -0.15833D0
PV(4) = 0.00208D0
PV(5) = 0.00792D0
PV(6) = -0.00007D0
PV(7) = -0.00019D0
PV(8) = 0.00000D0
PV(9) = 0.00000D0
WRITE (*, 40) 'Zenithal/azimuthal polynomial', (PV(J), J=0,9)
CALL PRJPLT ('ZPN', 90, 10, PV)
* ZEA: zenithal/azimuthal equal area.
WRITE (*, 30) 'Zenithal/azimuthal equal area'
CALL PRJPLT ('ZEA', 90, -90, PV)
* AIR: Airy's zenithal projection.
PV(1) = 45D0
WRITE (*, 40) 'Airy''s zenithal', PV(1)
CALL PRJPLT ('AIR', 90, -85, PV)
* CYP: cylindrical perspective.
PV(1) = 3.0D0
PV(2) = 0.8D0
WRITE (*, 40) 'Cylindrical perspective', (PV(J), J=1,2)
CALL PRJPLT ('CYP', 90, -90, PV)
* CEA: cylindrical equal area.
PV(1) = 0.75D0
WRITE (*, 40) 'Cylindrical equal area', PV(1)
CALL PRJPLT ('CEA', 90, -90, PV)
* CAR: plate carree.
WRITE (*, 30) 'Plate carree'
CALL PRJPLT ('CAR', 90, -90, PV)
* MER: Mercator's.
WRITE (*, 30) 'Mercator''s'
CALL PRJPLT ('MER', 85, -85, PV)
* SFL: Sanson-Flamsteed.
WRITE (*, 30) 'Sanson-Flamsteed (global sinusoid)'
CALL PRJPLT ('SFL', 90, -90, PV)
* PAR: parabolic.
WRITE (*, 30) 'Parabolic'
CALL PRJPLT ('PAR', 90, -90, PV)
* MOL: Mollweide's projection.
WRITE (*, 30) 'Mollweide''s'
CALL PRJPLT ('MOL', 90, -90, PV)
* AIT: Hammer-Aitoff.
WRITE (*, 30) 'Hammer-Aitoff'
CALL PRJPLT ('AIT', 90, -90, PV)
* COP: conic perspective.
PV(1) = 60D0
PV(2) = 15D0
WRITE (*, 40) 'Conic perspective', (PV(J), J=1,2)
CALL PRJPLT ('COP', 90, -25, PV)
* COE: conic equal area.
PV(1) = 60D0
PV(2) = -15D0
WRITE (*, 40) 'Conic equal area', (PV(J), J=1,2)
CALL PRJPLT ('COE', 90, -90, PV)
* COD: conic equidistant.
PV(1) = -60D0
PV(2) = 15D0
WRITE (*, 40) 'Conic equidistant', (PV(J), J=1,2)
CALL PRJPLT ('COD', 90, -90, PV)
* COO: conic orthomorphic.
PV(1) = -60D0
PV(2) = -15D0
WRITE (*, 40) 'Conic orthomorphic', (PV(J), J=1,2)
CALL PRJPLT ('COO', 85, -90, PV)
* BON: Bonne's projection.
PV(1) = 30D0
WRITE (*, 40) 'Bonne''s', PV(1)
CALL PRJPLT ('BON', 90, -90, PV)
* PCO: polyconic.
WRITE (*, 30) 'Polyconic'
CALL PRJPLT ('PCO', 90, -90, PV)
* TSC: tangential spherical cube.
WRITE (*, 30) 'Tangential spherical cube'
CALL PRJPLT ('TSC', 90, -90, PV)
* CSC: COBE quadrilateralized spherical cube.
WRITE (*, 30) 'COBE quadrilateralized spherical cube'
CALL PRJPLT ('CSC', 90, -90, PV)
* QSC: quadrilateralized spherical cube.
WRITE (*, 30) 'Quadrilateralized spherical cube'
CALL PRJPLT ('QSC', 90, -90, PV)
* HPX: HEALPix projection.
PV(1) = 4D0
PV(2) = 3D0
WRITE (*, 40) 'HEALPix', (PV(J), J=1,2)
CALL PRJPLT ('HPX', 90, -90, PV)
* XPH: HEALPix polar, aka "butterfly" projection.
WRITE (*, 40) 'Butterfly', (PV(J), J=1,2)
CALL PRJPLT ('XPH', 90, -90, PV)
CALL PGASK (0)
CALL PGEND
END
SUBROUTINE PRJPLT (PCODE, NORTH, SOUTH, PV)
*-----------------------------------------------------------------------
* PRJPLT draws a 15 degree coordinate graticule.
*
* Given:
* PCODE C*3 Projection code.
* NORTH I Northern cutoff latitude, degrees.
* SOUTH I Southern cutoff latitude, degrees.
* PV D(0:29) Projection parameters.
*-----------------------------------------------------------------------
LOGICAL CUBIC, HEALPX, INTRRP
INTEGER CI, H, ILAT, ILNG, J, K, LEN, NORTH, SOUTH, STAT(361),
: STATUS
REAL HX, HY, SX, SY, XR(512), XR0, YR(512), YR0
DOUBLE PRECISION LAT(361), LNG(361), PV(0:29), X(361), X0, Y(361),
: Y0
CHARACTER PCODE*3
* On some systems, such as Sun Sparc, the struct MUST be aligned
* on a double precision boundary, done here using an equivalence.
* Failure to do this may result in mysterious "bus errors".
INCLUDE 'prj.inc'
INTEGER PRJ(PRJLEN)
DOUBLE PRECISION DUMMY
EQUIVALENCE (PRJ,DUMMY)
*-----------------------------------------------------------------------
STATUS = PRJINI(PRJ)
DO 10 J = 0, 29
STATUS = PRJPTD (PRJ, PRJ_PV, PV(J), J)
10 CONTINUE
STATUS = PRJPTC (PRJ, PRJ_CODE, PCODE, 0)
WRITE (*, 20) PCODE, NORTH, SOUTH
20 FORMAT ('Plotting ',A3,'; latitudes',I3,' to',I4,'.')
CALL PGASK (0)
STATUS = PRJSET(PRJ)
STATUS = PRJGTI (PRJ, PRJ_CATEGORY, J)
CUBIC = J.EQ.PRJ_QUADCUBE
HEALPX = J.EQ.PRJ_HEALPIX
IF (CUBIC) THEN
* Draw the perimeter of the quadcube projection.
CALL PGENV (-335.0, 65.0, -200.0, 200.0, 1, -2)
CALL PGSCI (2)
CALL PGTEXT (-340.0, -220.0, PCODE // ' - 15 degree graticule')
CALL PGSCI (8)
STATUS = PRJGTD (PRJ, PRJ_X0, X0)
STATUS = PRJGTD (PRJ, PRJ_Y0, Y0)
XR0 = REAL(X0)
YR0 = REAL(Y0)
XR(1) = 45.0 + XR0
YR(1) = 45.0 - YR0
XR(2) = 45.0 + XR0
YR(2) = 3.0*45.0 - YR0
XR(3) = -45.0 + XR0
YR(3) = 3.0*45.0 - YR0
XR(4) = -45.0 + XR0
YR(4) = -3.0*45.0 - YR0
XR(5) = 45.0 + XR0
YR(5) = -3.0*45.0 - YR0
XR(6) = 45.0 + XR0
YR(6) = 45.0 - YR0
XR(7) = -7.0*45.0 + XR0
YR(7) = 45.0 - YR0
XR(8) = -7.0*45.0 + XR0
YR(8) = -45.0 - YR0
XR(9) = 45.0 + XR0
YR(9) = -45.0 - YR0
CALL PGLINE (9, XR, YR)
ELSE
CALL PGENV (-200.0, 200.0, -200.0, 200.0, 1, -2)
CALL PGSCI (2)
CALL PGTEXT (-240.0, -220.0, PCODE//' - 15 degree graticule')
IF (HEALPX) THEN
IF (PCODE.EQ.'HPX') THEN
* Draw the perimeter of the HEALPix projection.
CALL PGSCI (8)
H = NINT(PV(1))
SX = 180.0 / H
SY = SX * NINT(PV(2) + 1D0) / 2.0
STATUS = PRJGTD (PRJ, PRJ_X0, X0)
STATUS = PRJGTD (PRJ, PRJ_Y0, Y0)
XR0 = REAL(X0)
YR0 = REAL(Y0)
HX = 180.0 + XR0
HY = SY - SX - YR0
CALL PGMOVE (HX, HY)
DO 30 J = 1, H
HX = HX - SX
HY = HY + SX
CALL PGDRAW (HX, HY)
HX = HX - SX
HY = HY - SX
CALL PGDRAW (HX, HY)
30 CONTINUE
HX = 180.0 + XR0
HY = -SY + SX - YR0
IF (MOD(INT(PV(2)),2).EQ.1) THEN
K = 1
ELSE
K = -1
HY = HY - SX
END IF
CALL PGMOVE (HX, HY)
DO 40 J = 1, H
HX = HX - SX
HY = HY - K*SX
CALL PGDRAW (HX, HY)
HX = HX - SX
HY = HY + K*SX
CALL PGDRAW (HX, HY)
40 CONTINUE
ELSE IF (PCODE.EQ.'XPH') THEN
DO 70 ILNG = -90, 180, 90
LNG(1) = DBLE(ILNG) - 0.0001
J = 1
DO 50 ILAT = 90, -90, -1
LAT(J) = DBLE(ILAT)
J = J + 1
50 CONTINUE
STATUS = PRJS2X(PRJ, 1, 181, 1, 1, LNG, LAT, X, Y, STAT)
DO 60 J = 1, 181
XR(J) = -REAL(X(J))
YR(J) = REAL(Y(J))
60 CONTINUE
CALL PGLINE(181, XR, YR)
70 CONTINUE
END IF
END IF
END IF
CI = 1
DO 100 ILNG = -180, 180, 15
CI = CI + 1
IF (CI.GT.7) CI = 2
LNG(1) = DBLE(ILNG)
IF (ILNG.EQ.0) THEN
CALL PGSCI (1)
ELSE
CALL PGSCI (CI)
END IF
J = 1
DO 80 ILAT = NORTH, SOUTH, -1
LAT(J) = DBLE(ILAT)
J = J + 1
80 CONTINUE
LEN = NORTH - SOUTH + 1
STATUS = PRJS2X (PRJ, 1, LEN, 1, 1, LNG, LAT, X, Y, STAT)
K = 0
DO 90 J = 1, LEN
IF (STAT(J).NE.0) THEN
IF (K.GT.1) CALL PGLINE (K, XR, YR)
K = 0
GO TO 90
END IF
IF (CUBIC .AND. J.GT.1) THEN
IF (ABS(X(J) - X(J-1)).GT.2D0 .OR.
: ABS(Y(J) - Y(J-1)).GT.5D0) THEN
IF (K.GT.1) CALL PGLINE (K, XR, YR)
K = 0
END IF
ELSE IF (HEALPX .AND. ILNG.EQ.180) THEN
IF (X(J).GT.180D0) GO TO 90
END IF
K = K + 1
XR(K) = -REAL(X(J))
YR(K) = REAL(Y(J))
90 CONTINUE
CALL PGLINE (K, XR, YR)
100 CONTINUE
CI = 1
INTRRP = CUBIC .OR. HEALPX
DO 130 ILAT = -90, 90, 15
CI = CI + 1
IF (CI.GT.7) CI = 2
IF (ILAT.GT.NORTH) GO TO 130
IF (ILAT.LT.SOUTH) GO TO 130
LAT(1) = DBLE(ILAT)
IF (ILAT.EQ.0) THEN
CALL PGSCI (1)
ELSE
CALL PGSCI (CI)
END IF
ILNG = -180
DO 110 J = 1, 361
LNG(J) = DBLE(ILNG)
ILNG = ILNG + 1
110 CONTINUE
STATUS = PRJS2X (PRJ, 361, 1, 1, 1, LNG, LAT, X, Y, STAT)
K = 0
DO 120 J = 1, 361
IF (STAT(J).NE.0) THEN
IF (K.GT.1) CALL PGLINE (K, XR, YR)
K = 0
GO TO 120
END IF
IF (INTRRP .AND. J.GT.1) THEN
IF (ABS(X(J) - X(J-1)).GT.2D0 .OR.
: ABS(Y(J) - Y(J-1)).GT.5D0) THEN
IF (K.GT.1) CALL PGLINE (K, XR, YR)
K = 0
END IF
END IF
K = K + 1
XR(K) = -REAL(X(J))
YR(K) = REAL(Y(J))
120 CONTINUE
CALL PGLINE (K, XR, YR)
130 CONTINUE
CALL PGSCI(1)
XR(1) = 0.0
YR(1) = 0.0
CALL PGPT (1, XR, YR, 21)
CALL PGASK (1)
CALL PGPAGE()
RETURN
END
|
