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C***********************************************************************
C Module: spectrum.f
C
C Copyright (C) 1996 Harold Youngren, Mark Drela
C
C This program is free software; you can redistribute it and/or modify
C it under the terms of the GNU General Public License as published by
C the Free Software Foundation; either version 2 of the License, or
C (at your option) any later version.
C
C This program is distributed in the hope that it will be useful,
C but WITHOUT ANY WARRANTY; without even the implied warranty of
C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
C GNU General Public License for more details.
C
C You should have received a copy of the GNU General Public License
C along with this program; if not, write to the Free Software
C Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
C
C Report problems to: guppy@maine.com
C or drela@mit.edu
C***********************************************************************
program spectrum
C
C Displays chosen COLORSPECTRUMDEFAULT colors in a circle and bar
C
C
dimension xp(100), yp(100)
C
CHARACTER*12 HUES
CHARACTER*4 INP
CH = 0.02
C
PI = 4.0*ATAN(1.0)
C
C---Decide about what devices to plot to
WRITE(*,*) ' '
1 WRITE(*,*) ' Enter -1 for no PS, 0 for B&W PS, 1 for color PS'
READ(*,1000,end=2000) INP
ips = -1
if(INP.ne.' ') then
READ(INP,*,end=2000,err=2000) ips
endif
IDEV = 1
IF(ips.eq.0) IDEV = 3
IF(ips.ge.1) IDEV = 5
ipslu = 0
C
C---- for REPLOT: X11 only
IDEVRP = 1
CALL PLINITIALIZE
C
C---Now, how many colors...
WRITE(*,*) ' Enter number of colors'
READ(*,1000,end=2000) INP
ncolors = 128
if(INP.ne.' ') then
READ(INP,*,end=2000,err=2000) ncolors
endif
C
WRITE(*,*) ' Specify hue string (out of ROYGCBM)'
READ (*,1000) HUES
IF(HUES.EQ.' ') HUES = 'ROYGCBM'
C
C---Set up colormap spectrum colors
if(ncolors.LE.1) ncolors = 0
CALL COLORSPECTRUMHUES(ncolors,HUES)
C
C---- radius of circle
rad = 3.0
c
CALL PLOPEN(0.7,ipslu,IDEV)
CALL PLOT(1.3*rad,1.3*rad,-3)
c
c---- plot circle
do ii = 1,ncolors
call NEWCOLOR(-ii)
t0 = float(ii-1)/float(ncolors) ! + 0.167
t1 = float(ii )/float(ncolors) ! + 0.167
C
xp(1) = 0.0
yp(1) = 0.0
xp(2) = rad*cos(2.0*pi*t0)
yp(2) = rad*sin(2.0*pi*t0)
xp(3) = rad*cos(2.0*pi*(t0+0.25*(t1-t0)))
yp(3) = rad*sin(2.0*pi*(t0+0.25*(t1-t0)))
xp(4) = rad*cos(2.0*pi*(t0+0.50*(t1-t0)))
yp(4) = rad*sin(2.0*pi*(t0+0.50*(t1-t0)))
xp(5) = rad*cos(2.0*pi*(t0+0.75*(t1-t0)))
yp(5) = rad*sin(2.0*pi*(t0+0.75*(t1-t0)))
xp(6) = rad*cos(2.0*pi*t1)
yp(6) = rad*sin(2.0*pi*t1)
call POLYLINE(xp,yp,6,1)
end do
C
CALL PLOT(1.5*rad,-rad,-3)
C
c---- plot bar
dx = 1.0
dy = 2.0*rad/float(ncolors)
do ii = 1,ncolors
call NEWCOLOR(-ii)
c
x0 = 0.0
y0 = dy*float(ii-1)
c
xp(1) = x0
yp(1) = y0
xp(2) = x0+dx
yp(2) = y0
xp(3) = x0+dx
yp(3) = y0+dy
xp(4) = x0
yp(4) = y0+dy
call POLYLINE(xp,yp,4,1)
end do
C
CALL NEWCOLORNAME('black')
CALL PLOTABS(1.,.75,-3)
CALL PLCHAR (999.,999.,.1,'SPECTRUM ',0.,+10)
CALL PLCHAR (999.,999.,.1,HUES,0.,LEN(HUES))
CALL PLOTABS(1.,0.5,-3)
CALL PLCHAR (999.,999.,.1,'Ncolors = ',0.,+10)
CALL PLNUMB (999.,999.,.1,FLOAT(ncolors),0.,-1)
C
CALL PLFLUSH
WRITE(*,*) 'Hit return to test replot'
READ(5,1000) DUMMY
C
CALL REPLOT(IDEVRP)
CALL PLFLUSH
C
WRITE(*,*) 'Hit return to end test'
READ(5,1000) DUMMY
1000 FORMAT(A)
C
C GO TO 1
C
2000 CALL PLOT(0.0,0.0,+999)
STOP
END
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