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PROGRAM PGDEM4
C-----------------------------------------------------------------------
C Test program for PGPLOT: test of imaging routine PGIMAG and associated
C routines PGWEDG and PGCTAB.
C-----------------------------------------------------------------------
INTEGER PGOPEN
INTEGER MXI, MXJ
PARAMETER (MXI=64, MXJ=64)
INTEGER I, L, C1, C2, NC
REAL F(MXI,MXJ)
REAL FMIN,FMAX,TR(6), CONTRA, BRIGHT, ANGLE, C, S, ALEV(1)
CHARACTER*16 VAL
C
C Introduction.
C
WRITE(*,*)'Demonstration of PGIMAG and associated routines.'
WRITE(*,*)'This program requires a device with color capability.'
WRITE(*,*)'On an interactive device, you can modify the color map'
WRITE(*,*)'used for the image.'
WRITE(*,*)
C
C Open device for graphics.
C
IF (PGOPEN('?') .LT. 1) STOP
CALL PGQINF('TYPE', VAL, L)
WRITE (*,*) 'PGPLOT device type: ', VAL(1:L)
CALL PGQCIR(C1, C2)
NC = MAX(0, C2-C1+1)
WRITE (*,*) 'Number of color indices used for image: ', NC
IF (NC .LT.8) THEN
WRITE (*,*) 'Not enough colors available on this device'
STOP
ELSE
WRITE (*,*)
END IF
C
C Compute a suitable function in array F.
C
CALL FUNC(F, MXI, MXJ, FMIN, FMAX)
C
C-----------------------------------------------------------------------
C Example 1: simple transformation matrix
C-----------------------------------------------------------------------
C
C Set the coordinate transformation matrix:
C world coordinate = pixel number.
C
TR(1) = 0.0
TR(2) = 1.0
TR(3) = 0.0
TR(4) = 0.0
TR(5) = 0.0
TR(6) = 1.0
C
C Clear the screen. Set up window and viewport.
C
CALL PGPAGE
CALL SETVP
CALL PGWNAD(0.0, 1.0+MXI, 0.0, 1.0+MXJ)
C
C Set up the color map.
C
BRIGHT = 0.5
CONTRA = 1.0
CALL PALETT(2, CONTRA, BRIGHT)
C
C Draw the map with PGIMAG.
C
CALL PGIMAG(F,MXI,MXJ,1,MXI,1,MXJ,FMIN,FMAX,TR)
C
C Annotate the plot.
C
CALL PGMTXT('t',1.0,0.0,0.0,'PGIMAG, PGWEDG, and PGCTAB')
CALL PGSCH(0.6)
CALL PGBOX('bcntsi',0.0,0,'bcntsiv',0.0,0)
CALL PGMTXT('b',3.0,1.0,1.0,'pixel number')
C
C Draw a wedge.
C
CALL PGWEDG('BI', 4.0, 5.0, FMIN, FMAX, 'pixel value')
CALL PGSCH(1.0)
C
C If the device has a cursor, allow user to fiddle with color table.
C
CALL PGQINF('CURSOR', VAL, L)
IF (VAL(:L).EQ.'YES') THEN
CALL FIDDLE
CALL PGASK(.FALSE.)
END IF
C
C-----------------------------------------------------------------------
C Example 2: rotation, overlay contours.
C-----------------------------------------------------------------------
C
C Compute the coordinate transformation matrix. The matrix is chosen
C to put array element (MXI/2, MXJ/2) at (X,Y)=(0,0), and map the
C entire array onto a square of side 2, rotated through angle ANGLE
C radians.
C
ANGLE = 120.0/57.29578
C = COS(ANGLE)
S = SIN(ANGLE)
TR(1) = -C - S
TR(2) = 2.0*C/REAL(MXI)
TR(3) = 2.0*S/REAL(MXJ)
TR(4) = -C + S
TR(5) = (-2.0)*S/REAL(MXI)
TR(6) = 2.0*C/REAL(MXJ)
C
C Clear the screen. Set up window and viewport.
C
CALL PGPAGE
CALL SETVP
CALL PGWNAD(-1.0, 1.0, -1.0, 1.0)
CALL PGSCI(1)
C
C Set up the color map.
C
BRIGHT = 0.5
CONTRA = 1.0
CALL PALETT(2, CONTRA, BRIGHT)
C
C Draw the map with PGIMAG.
C
CALL PGIMAG(F,MXI,MXJ,1,MXI,1,MXJ,FMIN,FMAX,TR)
C
C Overlay contours in white.
C
CALL PGSCI(1)
DO 40 I=1,21
ALEV(1) = FMIN + (I-1)*(FMAX-FMIN)/20.0
IF (MOD(I,5).EQ.0) THEN
CALL PGSLW(3)
ELSE
CALL PGSLW(1)
END IF
IF (I.LT.10) THEN
CALL PGSLS(2)
ELSE
CALL PGSLS(1)
END IF
CALL PGCONT(F,MXI,MXJ,1,MXI,1,MXJ,ALEV,-1,TR)
40 CONTINUE
CALL PGSLS(1)
CALL PGSLW(1)
C
C Annotate the plot.
C
CALL PGSCI(1)
CALL OUTLIN(1,MXI,1,MXJ,TR)
CALL PGMTXT('t',1.0,0.0,0.0,'PGIMAG, PGCONT and PGWEDG')
CALL PGSCH(0.6)
CALL PGBOX('bctsn',0.0,0,'bctsn',0.0,0)
C
C Draw a wedge.
C
CALL PGWEDG('BI', 4.0, 5.0, FMIN, FMAX, 'pixel value')
CALL PGSCH(1.0)
C
C If the device has a cursor, allow user to fiddle with color table.
C
CALL PGQINF('CURSOR', VAL, L)
IF (VAL(:L).EQ.'YES') THEN
CALL FIDDLE
END IF
C
C Close the device and exit.
C
CALL PGEND
C-----------------------------------------------------------------------
END
SUBROUTINE PALETT(TYPE, CONTRA, BRIGHT)
C-----------------------------------------------------------------------
C Set a "palette" of colors in the range of color indices used by
C PGIMAG.
C-----------------------------------------------------------------------
INTEGER TYPE
REAL CONTRA, BRIGHT
C
REAL GL(2), GR(2), GG(2), GB(2)
REAL RL(9), RR(9), RG(9), RB(9)
REAL HL(5), HR(5), HG(5), HB(5)
REAL WL(10), WR(10), WG(10), WB(10)
REAL AL(20), AR(20), AG(20), AB(20)
C
DATA GL /0.0, 1.0/
DATA GR /0.0, 1.0/
DATA GG /0.0, 1.0/
DATA GB /0.0, 1.0/
C
DATA RL /-0.5, 0.0, 0.17, 0.33, 0.50, 0.67, 0.83, 1.0, 1.7/
DATA RR / 0.0, 0.0, 0.0, 0.0, 0.6, 1.0, 1.0, 1.0, 1.0/
DATA RG / 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 0.6, 0.0, 1.0/
DATA RB / 0.0, 0.3, 0.8, 1.0, 0.3, 0.0, 0.0, 0.0, 1.0/
C
DATA HL /0.0, 0.2, 0.4, 0.6, 1.0/
DATA HR /0.0, 0.5, 1.0, 1.0, 1.0/
DATA HG /0.0, 0.0, 0.5, 1.0, 1.0/
DATA HB /0.0, 0.0, 0.0, 0.3, 1.0/
C
DATA WL /0.0, 0.5, 0.5, 0.7, 0.7, 0.85, 0.85, 0.95, 0.95, 1.0/
DATA WR /0.0, 1.0, 0.0, 0.0, 0.3, 0.8, 0.3, 1.0, 1.0, 1.0/
DATA WG /0.0, 0.5, 0.4, 1.0, 0.0, 0.0, 0.2, 0.7, 1.0, 1.0/
DATA WB /0.0, 0.0, 0.0, 0.0, 0.4, 1.0, 0.0, 0.0, 0.95, 1.0/
C
DATA AL /0.0, 0.1, 0.1, 0.2, 0.2, 0.3, 0.3, 0.4, 0.4, 0.5,
: 0.5, 0.6, 0.6, 0.7, 0.7, 0.8, 0.8, 0.9, 0.9, 1.0/
DATA AR /0.0, 0.0, 0.3, 0.3, 0.5, 0.5, 0.0, 0.0, 0.0, 0.0,
: 0.0, 0.0, 0.0, 0.0, 1.0, 1.0, 1.0, 1.0, 1.0, 1.0/
DATA AG /0.0, 0.0, 0.3, 0.3, 0.0, 0.0, 0.0, 0.0, 0.8, 0.8,
: 0.6, 0.6, 1.0, 1.0, 1.0, 1.0, 0.8, 0.8, 0.0, 0.0/
DATA AB /0.0, 0.0, 0.3, 0.3, 0.7, 0.7, 0.7, 0.7, 0.9, 0.9,
: 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0/
C
IF (TYPE.EQ.1) THEN
C -- gray scale
CALL PGCTAB(GL, GR, GG, GB, 2, CONTRA, BRIGHT)
ELSE IF (TYPE.EQ.2) THEN
C -- rainbow
CALL PGCTAB(RL, RR, RG, RB, 9, CONTRA, BRIGHT)
ELSE IF (TYPE.EQ.3) THEN
C -- heat
CALL PGCTAB(HL, HR, HG, HB, 5, CONTRA, BRIGHT)
ELSE IF (TYPE.EQ.4) THEN
C -- weird IRAF
CALL PGCTAB(WL, WR, WG, WB, 10, CONTRA, BRIGHT)
ELSE IF (TYPE.EQ.5) THEN
C -- AIPS
CALL PGCTAB(AL, AR, AG, AB, 20, CONTRA, BRIGHT)
END IF
END
SUBROUTINE SETVP
C-----------------------------------------------------------------------
C Set the viewport, allowing margins around the edge for annotation.
C (This is similar in effect to PGVSTD, but has different margins.)
C The routine determines the view-surface size and allocates margins
C as fractions of the minimum of width and height.
C-----------------------------------------------------------------------
REAL D, VPX1, VPX2, VPY1, VPY2
C
CALL PGSVP(0.0, 1.0, 0.0, 1.0)
CALL PGQVP(1, VPX1, VPX2, VPY1, VPY2)
D = MIN(VPX2-VPX1, VPY2-VPY1)/40.0
VPX1 = VPX1 + 5.0*D
VPX2 = VPX2 - 2.0*D
VPY1 = VPY1 + 8.0*D
VPY2 = VPY2 - 2.0*D
CALL PGVSIZ(VPX1, VPX2, VPY1, VPY2)
END
SUBROUTINE FIDDLE
C
INTEGER P, IER, PGCURS
REAL CONTRA, BRIGHT, X, Y, SIGN
REAL X1, Y1, X2, Y2, B1, B2, C1, C2
CHARACTER CH
C
WRITE (*,*) 'Use cursor to adjust color table:'
WRITE (*,*) ' Keys 1,2,3,4,5 select different palettes'
WRITE (*,*) ' Key P cycles through available palettes'
WRITE (*,*) ' Key F adjusts contrast and brightness, with'
WRITE (*,*) ' cursor x position setting brightness [0.0 - 1.0]'
WRITE (*,*) ' and y position setting contrast [0.0 - 10.0]'
WRITE (*,*) ' (Hold down F key while moving cursor to change'
WRITE (*,*) ' contrast and brightness continuously)'
WRITE (*,*) ' Key C resets contrast=1.0, brightness=0.5'
WRITE (*,*) ' Key - reverses color palette'
WRITE (*,*) ' Key X or right mouse button exits program'
C
P = 2
CONTRA = 1.0
BRIGHT = 0.5
X = 0.5
Y = 1.0
SIGN = +1.0
C
CALL PGQWIN(X1, X2, Y1, Y2)
B1 = 0.0
B2 = 1.0
C1 = 0.0
C2 = 10.0
CALL PGSWIN(B1, B2, C1, C2)
10 IER = PGCURS(X, Y, CH)
IF (CH.EQ.CHAR(0) .OR. CH.EQ.'x' .OR. CH.EQ.'X') THEN
CALL PGSWIN(X1, X2, Y1, Y2)
RETURN
ELSE IF (CH.EQ.'F' .OR. CH.EQ.'f') THEN
BRIGHT = MAX(B1, MIN(B2,X))
CONTRA = MAX(C1, MIN(C2,Y))
ELSE IF (CH.EQ.'C' .OR. CH.EQ.'c') THEN
CONTRA = 1.0
Y = 1.0
BRIGHT = 0.5
X = 0.5
ELSE IF (CH.EQ.'-') THEN
SIGN = -SIGN
ELSE IF (CH.EQ.'1') THEN
P = 1
ELSE IF (CH.EQ.'2') THEN
P = 2
ELSE IF (CH.EQ.'3') THEN
P = 3
ELSE IF (CH.EQ.'4') THEN
P = 4
ELSE IF (CH.EQ.'5') THEN
P = 5
ELSE IF (CH.EQ.'P' .OR. CH.EQ.'p') THEN
P = 1 + MOD(P,5)
END IF
CALL PALETT(P, SIGN*CONTRA, BRIGHT)
GOTO 10
END
SUBROUTINE FUNC(F, M, N, FMIN, FMAX)
INTEGER M,N
REAL F(M,N), FMIN, FMAX
C
INTEGER I, J
REAL R
C
FMIN = 1E30
FMAX = -1E30
DO 20 I=1,M
DO 10 J=1,N
R = SQRT(REAL(I)**2 + REAL(J)**2)
F(I,J) = COS(0.6*SQRT(I*80./M)-16.0*J/(3.*N))*
: COS(16.0*I/(3.*M))+(I/REAL(M)-J/REAL(N)) +
: 0.05*SIN(R)
FMIN = MIN(F(I,J),FMIN)
FMAX = MAX(F(I,J),FMAX)
10 CONTINUE
20 CONTINUE
END
SUBROUTINE OUTLIN(I1,I2,J1,J2,TR)
INTEGER I1,I2,J1,J2
REAL TR(6)
C-----------------------------------------------------------------------
C Draw the enclosing rectangle of the subarray to be contoured,
C applying the transformation TR.
C
C For a contour map, the corners are (I1,J1) and (I2,J2); for
C a gray-scale map, they are (I1-0.5,J1-0.5), (I2+0.5, J2+0.5).
C-----------------------------------------------------------------------
INTEGER K
REAL XW(5), YW(5), T
C
XW(1) = I1
YW(1) = J1
XW(2) = I1
YW(2) = J2
XW(3) = I2
YW(3) = J2
XW(4) = I2
YW(4) = J1
XW(5) = I1
YW(5) = J1
DO 10 K=1,5
T = XW(K)
XW(K) = TR(1) + TR(2)*T + TR(3)*YW(K)
YW(K) = TR(4) + TR(5)*T + TR(6)*YW(K)
10 CONTINUE
CALL PGLINE(5,XW,YW)
END
|
