                    Appendix B: Examples

B.1 Demonstration of CURVE

            PROGRAM EXA_1
            PARAMETER (N=301)
            DIMENSION XRAY(N),Y1RAY(N),Y2RAY(N)

            PI=3.1415926
            FPI=PI/180.
            STEP=360./(N-1)

            DO I=1,N
              XRAY(I)=(I-1)*STEP
              X=XRAY(I)*FPI
              Y1RAY(I)=SIN(X)
              Y2RAY(I)=COS(X)
            END DO

            CALL DISINI
            CALL PAGERA
            CALL COMPLX

            CALL AXSPOS(450,1800)
            CALL AXSLEN(2200,1200)

            CALL NAME('X-axis','X')
            CALL NAME('Y-axis','Y')

            CALL DIGITS(-1,'X')
            CALL TICKS(10,'XY')

            CALL TITLIN('Demonstration of CURVE',1)
            CALL TITLIN('SIN(X), COS(X)',3)

            CALL GRAF(0.,360.,0.,90.,-1.,1.,-1.,0.5)
            CALL TITLE

            CALL CURVE(XRAY,Y1RAY,N)
            CALL CURVE(XRAY,Y2RAY,N)

            CALL DASH
            CALL XAXGIT

            CALL DISFIN
            END

B.2 Symbols

            PROGRAM EXA_2
            CHARACTER*20 CTIT,CSTR*2
            CTIT='Symbols'

            CALL SETPAG('DA4P')
            CALL DISINI
            CALL COMPLX
            CALL PAGERA
            CALL PAGHDR('H. Michels  (',')',2,0)

            CALL HEIGHT(60)

            NL=NLMESS(CTIT)
            CALL MESSAG(CTIT,(2100-NL)/2,200)

            CALL HEIGHT(50)
            CALL HSYMBL(120)

            NY=150

            DO I=0,21
              IF(MOD(I,4).EQ.0) THEN
                NY=NY+400
                NXP=550
              ELSE
                NXP=NXP+350
              END IF

              IF(I.LT.10) THEN
                WRITE(CSTR,'(I1)') I
              ELSE
                WRITE(CSTR,'(I2)') I
              END IF

              NL=NLMESS(CSTR)/2
              CALL MESSAG(CSTR,NXP-NL,NY+150)
              CALL SYMBOL(I,NXP,NY)
            END DO

            CALL DISFIN
            END

B.3 Logarithmic Scaling

            PROGRAM EXA_3
            CHARACTER*60 CTIT,CLAB(3)*5
            DATA CLAB/'LOG','FLOAT','ELOG '/

            CTIT='Logarithmic Scaling'

            CALL SETPAG('DA4P')
            CALL DISINI
            CALL PAGERA
            CALL COMPLX
            CALL AXSLEN(1400,500)

            CALL NAME('X-axis','X')
            CALL NAME('Y-axis','Y')
            CALL SCALE('LOG','XY')

            CALL TITLIN(CTIT,2)

            DO I=1,3
              NYA=2650-(I-1)*800
              CALL DIGITS(-1,'XY')
              IF(I.EQ.2)THEN
                CALL DIGITS(1,'Y')
                CALL NAME(' ','X')
              END IF

              CALL AXSPOS(500,NYA)
              CALL MESSAG('Labels: '//CLAB(I),600,NYA-400)
              CALL LABELS(CLAB(I),'XY')
              CALL GRAF(0.,3.,0.,1.,-1.,2.,-1.,1.)

              IF(I.EQ.3) THEN
                CALL HEIGHT(50)
                CALL TITLE
              END IF

              CALL ENDGRF
            END DO

            CALL DISFIN
            END

B.4 Interpolation Methods

            PROGRAM EXA_4

            DIMENSION X(16), Y(16)
            CHARACTER*8 CPOL(6),CTIT*60

            DATA X/0.,1.,3.,4.5,6.,8.,9.,11.,12.,12.5,13.,
           *       15.,16.,17.,19.,20./
           * Y/2.,4.,4.5,3.,1.,7.,2.,3.,5.,2.,2.5,2.,4.,6.,
           *   5.5,4./
           * CPOL/'SPLINE','STEM','BARS','STAIRS',
           *      'STEP','LINEAR'/ NYA/2700/

            CTIT='Interpolation Methods'

            CALL SETPAG('DA4P')
            CALL DISINI
            CALL PAGERA
            CALL COMPLX
            CALL INCMRK(1)
            CALL HSYMBL(25)
            CALL TITLIN(CTIT,1)
            CALL AXSLEN(1500,350)
            CALL SETGRF('LINE','LINE','LINE','LINE')

            DO I=1,6
              CALL AXSPOS(350,NYA-(I-1)*350)
              CALL POLCRV(CPOL(I))
              CALL MARKER(0)

              CALL GRAF(0.,20.,0.,5.,0.,10.,0.,5.)
              NX=NXPOSN(1.)
              NY=NYPOSN(8.)
              CALL MESSAG(CPOL(I),NX,NY)
              CALL CURVE(X,Y,16)

              IF(I.EQ.6) THEN
                CALL HEIGHT(50)
                CALL TITLE
              END IF
              CALL ENDGRF
            END DO

            CALL DISFIN
            END

B.5 Line Styles

            PROGRAM EXA_5
            DIMENSION X(2),Y(2)
            CHARACTER*6 CTYP(8)
            DATA X/3.,9./,
     *           CTYP/'SOLID','DOT','DASH','CHNDSH',
     *                'CHNDOT','DASHM','DOTL','DASHL'/

            CALL SETPAG('DA4P')
            CALL DISINI
            CALL PAGERA
            CALL COMPLX
            CALL CENTER
            CALL CHNCRV('LINE')

            CALL NAME('X-axis','X')
            CALL NAME('Y-axis','Y')

            CALL TITLIN('Demonstration of CURVE',1)
            CALL TITLIN('Line Styles',3)

            CALL GRAF(0.,10.,0.,2.,0.,10.,0.,2.)
            CALL TITLE

            DO I=1,8
              Y(1)=9.5-I
              Y(2)=9.5-I
              NY=NYPOSN(Y(1))
              NX=NXPOSN(1.0)
              CALL MESSAG(CTYP(I),NX,NY-20)
              CALL CURVE(X,Y,2)
            END DO

            CALL DISFIN
            END

B.6 Legends

            PROGRAM EXA_6
            PARAMETER(N=301)
            DIMENSION XRAY(N),Y1RAY(N),Y2RAY(N)
            CHARACTER*14 CBUF

            FPI=3.1415926/180.
            STEP=360./(N-1)
            DO I=1,N
              XRAY(I)=(I-1)*STEP
              X=XRAY(I)*FPI
              Y1RAY(I)=SIN(X)
              Y2RAY(I)=COS(X)
            END DO

            CALL DISINI
            CALL PAGERA
            CALL COMPLX
            CALL AXSPOS(450,1800)
            CALL AXSLEN(2200,1200)

            CALL NAME('X-axis','X')
            CALL NAME('Y-axis','Y')
            CALL TITLIN('Demonstration of CURVE',1)
            CALL TITLIN('Legend',3)
            CALL DIGITS(-1,'X')
            CALL TICKS(10,'XY')

            CALL GRAF(0.,360.,0.,90.,-1.,1.,-1.,0.5)
            CALL TITLE
            CALL XAXGIT

            CALL CHNCRV('LINE')
            CALL CURVE(XRAY,Y1RAY,N)
            CALL CURVE(XRAY,Y2RAY,N)

            CALL LEGINI(CBUF,2,7)    ! Legend statements
            NX=NXPOSN(190.)
            NY=NYPOSN(0.75)
            CALL LEGPOS(NX,NY)
            CALL LEGLIN(CBUF,'sin (x)',1)
            CALL LEGLIN(CBUF,'cos (x)',2)
            CALL LEGTIT('Legend')
            CALL LEGEND(CBUF,3)

            CALL DISFIN
            END

B.7 Shading Patterns (AREAF)

            PROGRAM EXA_7
            DIMENSION IXP(4),IYP(4),IX(4),IY(4)
            CHARACTER*60 CTIT,CSTR*2
            DATA IX/0,300,300,0/IY/0,0,400,400/

            CTIT='Shading Patterns (AREAF)'

            CALL DISINI
            CALL PAGERA
            CALL COMPLX

            CALL HEIGHT(50)
            NL=NLMESS(CTIT)
            NX=(2970-NL)/2
            CALL MESSAG(CTIT,NX,200)

            NX0=335
            NY0=350

            DO I=1,3
              NY=NY0+(I-1)*600
              DO J=1,6
                NX=NX0+(J-1)*400
                II=(I-1)*6+J-1
                CALL SHDPAT(II)
                WRITE(CSTR,'(I2)') II

                DO K=1,4
                  IXP(K)=IX(K)+NX
                  IYP(K)=IY(K)+NY
                END DO
                CALL AREAF(IXP,IYP,4)

                NL=NLMESS(CSTR)
                NX=NX+(300-NL)/2
                CALL MESSAG(CSTR,NX,NY+460)
              END DO
            END DO

            CALL DISFIN
            END

B.8 Vectors

            PROGRAM EXA_8
            DIMENSION IVEC(20)
            CHARACTER*60 CTIT,CNUM*4
            DATA IVEC/0,1111,1311,1421,1531,1701,1911,
           *          3111,3311,3421,3531,3703,4221,4302,
           *          4413,4522,4701,5312,5502,5703/

            CTIT='Vectors'

            CALL DISINI
            CALL PAGERA
            CALL COMPLX

            CALL HEIGHT(60)
            NL=NLMESS(CTIT)
            NX=(2970-NL)/2
            CALL MESSAG(CTIT,NX,200)

            CALL HEIGHT(50)
            NX=300
            NY=400

            DO I=1,20
              IF(I.EQ.11) THEN
                NX=NX+2970/2
                NY=400
              END IF

              WRITE(CNUM,'(I4)') IVEC(I)
              NL=NLMESS(CNUM)
              CALL MESSAG(CNUM,NX-NL,NY-25 )

              CALL VECTOR(NX+100,NY,NX+1000,NY,IVEC(I))
              NY=NY+160
            END DO

            CALL DISFIN
            END

B.9 Shading Patterns (PIEGRF)

            PROGRAM EXA_9
            DIMENSION XRAY(18)
            CHARACTER*60 CTIT,CBUF*36,CSTR*2
            DATA XRAY/18*1./

            CTIT='Shading Patterns (PIEGRF)'

            CALL SETPAG('DA4P')
            CALL DISINI
            CALL PAGERA
            CALL COMPLX

            CALL AXSPOS(250,2700)
            CALL AXSLEN(1600,2200)
            CALL TITLIN(CTIT,3)
            CALL HEIGHT(50)

            CALL LEGINI(CBUF,18,2)

            DO I=1,18
              WRITE(CSTR,'(I2)') I-1
              CALL LEGLIN(CBUF,CSTR,I)
            END DO

            CALL LABELS('NONE','PIE')
            CALL PIEGRF(CBUF,1,XRAY,18)
            CALL TITLE

            CALL DISFIN
            END

B.10 Surface Plot (SURFUN)

            PROGRAM EXA_10
            CHARACTER*60 CTIT1,CTIT2
            EXTERNAL ZFUN

            CTIT1='Surface Plot (SURFUN)'
            CTIT2='F(X,Y) = 2*SIN(X)*SIN(Y)'

            CALL SETPAG('DA4P')
            CALL DISINI
            CALL PAGERA
            CALL COMPLX

            CALL AXSPOS(200,2600)
            CALL AXSLEN(1800,1800)

            CALL NAME('X-axis','X')
            CALL NAME('Y-axis','Y')
            CALL NAME('Z-axis','Z')

            CALL TITLIN(CTIT1,2)
            CALL TITLIN(CTIT2,4)

            CALL VIEW3D(-5.,-5.,4.,'ABS')
            CALL GRAF3D(0.,360.,0.,90.,0.,360.,0.,90.,
           *                            -3.,3.,-3.,1.)
            CALL HEIGHT(50)
            CALL TITLE

            CALL SURFUN(ZFUN,1,10.,1,10.)

            CALL DISFIN
            END

            FUNCTION ZFUN(X,Y)
            FPI=3.14159/180.
            ZFUN=2*SIN(X*FPI)*SIN(Y*FPI)
            END

B.11 Map Plot

            PROGRAM EXA_11
            DIMENSION XC(9),YC(9)
            CHARACTER*12 CSTR(9)

            DATA XC/-22.,18.,37.5,0.,2.5,12.5,23.5,-3.75,
           *        14.25/,
           *     YC/64.,59.6,56.,51.5,48.5,42.,38.,40.3,
           *        50.1/,
           *   CSTR/'Reykjavik','Stockholm','Moskau',
           *        'London','Paris','Rom','Athen','Madrid',
           *        'Prag'/

            CALL METAFL('POST')
            CALL DISINI
            CALL PAGERA
            CALL HWFONT

            CALL AXSPOS(500,1850)
            CALL AXSLEN(2200,1400)

            CALL DIGITS(-1,'xy')
            CALL TICKS(1,'xy')
            CALL NAME('Longitude','x')
            CALL NAME('Latitude','y')

            CALL TITLIN('Map Plot',3)
            CALL INCMRK(-1)

            CALL LABELS('MAP','xy')
            CALL PROJCT('LAMBERT')
            CALL FRAME(3)
            CALL GRAFMP(-40.,60.,-40.,20.,35.,70.,40.,10.)

            CALL WORLD
            CALL CURVMP(XC,YC,9)

            DO I=1,9
              CALL POS2PT(XC(I),YC(I),XP,YP)
              NXP=XP+30
              NYP=YP
              CALL MESSAG(CSTR(I),NXP,NYP)
            END DO

            CALL GRIDMP(1,1)

            CALL HEIGHT(50)
            CALL TITLE
            CALL DISFIN
            END
