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C***********************************************************************
C Module: cmap.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 cmap2
c---------------------------------------------------------------
c Color selection program.
c
c Displays a 2-D slice through the R-G-B color space,
c and gives the R,G,B components of a mouse-selected color.
c
c The cutting plane is parallel to the RG, RB, or GB plane.
c The position along the remaining B, G, or R axis is specified
c by the % saturation 0..100.
c
c---------------------------------------------------------------
c
character*2 plane
character*1 axis, chkey
c
character*40 colorname
c
dimension x(5), y(5)
logical lok
c
ch = 0.03
c
1000 format(a)
c
5 write(*,1050)
1050 format(/' Enter cutting-plane orientation (RG, RB, or GB): ',$)
read (*,1000) plane
c
axis = ' '
if(index('RGrg',plane(1:1)).NE.0 .AND.
& index('RGrg',plane(2:2)).NE.0 ) axis = 'B'
if(index('RBrb',plane(1:1)).NE.0 .AND.
& index('RBrb',plane(2:2)).NE.0 ) axis = 'G'
if(index('Gbgb',plane(1:1)).NE.0 .AND.
& index('Gbgb',plane(2:2)).NE.0 ) axis = 'R'
c
ccc if(index('RGB',axis).EQ.0) go to 5
if(index('RGB',axis).EQ.0) then
call replot(4)
call plot(0.,0.,+999)
stop
endif
c
c
write(*,1100) axis
1100 format( ' Enter % saturation along ',a1,' axis (0..100) : ', $)
read (*,*) isat
c
isat = max( 0,isat)
isat = min( 99,isat)
c
nc = 10
c
sat = float(isat) / 100.0
c
c
c---- R,G,B unit vectors for projection onto x-y cutting plane
xr = 0.
yr = 0.
zr = 0.
c
xg = 0.
yg = 0.
zg = 0.
c
xb = 0.
yb = 0.
zb = 0.
c
if(sat .lt. 0.50) then
c
if(index('R',axis).EQ.1) then
zr = 1.0
xg = 1.0
yb = 1.0
endif
c
if(index('G',axis).EQ.1) then
yr = 1.0
zg = 1.0
xb = 1.0
endif
c
if(index('B',axis).EQ.1) then
xr = 1.0
yg = 1.0
zb = 1.0
endif
c
else
c
if(index('R',axis).EQ.1) then
zr = 1.0
yg = 1.0
xb = 1.0
endif
c
if(index('G',axis).EQ.1) then
xr = 1.0
zg = 1.0
yb = 1.0
endif
c
if(index('B',axis).EQ.1) then
yr = 1.0
xg = 1.0
zb = 1.0
endif
c
endif
c
C
C---Initialize the plot package before we get into color plotting...
CALL PLINITIALIZE
c
call PLOPEN(0.8,0,1)
call PLOT(5.5, 4.25, -3)
call NEWFACTOR(6.0)
call PLOT(-0.5,-0.5,-3)
c
c call plopen(-0.8,0,5)
c call plot(0.5,0.5,-3)
c call newfactor(1.4)
c
xdel = 1.0/float(nc)
ydel = 1.0/float(nc)
c
do 10 j = 1, nc
y0 = ydel*float(j-1)
c
do 105 i = 1, nc
x0 = xdel*float(i-1)
c
xx = x0 + 0.5*xdel
yy = y0 + 0.5*ydel
zz = sat
c
r = xx*xr + yy*yr + zz*zr
g = xx*xg + yy*yg + zz*zg
b = xx*xb + yy*yb + zz*zb
c
ir = int(256.0*r)
ig = int(256.0*g)
ib = int(256.0*b)
c
x(1) = x0
y(1) = y0
x(2) = x0 + xdel
y(2) = y0
x(3) = x0 + xdel
y(3) = y0 + ydel
x(4) = x0
y(4) = y0 + ydel
x(5) = x0
y(5) = y0
n = 5
c
call NEWCOLORRGB(ir,ig,ib)
call POLYLINE(x,y,n,1)
c
105 continue
10 continue
c
call PLFLUSH
c
write(*,*)
write(*,*) 'Click on colors...'
C
200 call GETCURSORXY(xx,yy,chkey)
c ikey = ichar(chkey)
c write(*,*) ikey
zz = sat
c
r = xx*xr + yy*yr + zz*zr
g = xx*xg + yy*yg + zz*zg
b = xx*xb + yy*yb + zz*zb
c
ir = int(256.0*r)
ig = int(256.0*g)
ib = int(256.0*b)
c
write(*,1500) ir, ig, ib
1500 format(1x,'R G B = ', i4,',',i4,',',i4)
c
if( lok(ir,ig,ib) ) then
go to 200
endif
c
go to 5
end
logical function lok(ir,ig,ib)
lok = ir.LE.255 .AND. ig.LE.255 .AND. ib.LE.255 .AND.
& ir.GE.0 .AND. ig.GE.0 .AND. ib.GE.0
return
end
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