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C***********************************************************************
C Module: cmap3.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 cmap3
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 perpendicular to the diagonal
c axis running from R,G,B = 0,0,0 (black), to
c R,G,B = 1,1,1 (white). The position of this cutting
c plane is specified by the % saturation 0..300.
c The plane passes through one or three pure-color
c corners for the specific saturations shown.
c
c 0% (0 0 0) black
c 100% (1 0 0), (0 1 0), (0 0 1) red , green , blue
c 200% (1 1 0), (1 0 1), (0 1 1) yellow, magenta, cyan
c 300% (1 1 1) white
c
c For 0-100% and 200-300%, the cutting plane is a triangle.
c For 100-200%, the plane is a hexagon.
c
c---------------------------------------------------------------
c
dimension x(4), y(4)
logical lok
character*1 chkey
c
ch = 0.03
call PLINITIALIZE
c
1 continue
c
write(*,1100)
1100 format(/' Enter % saturation (0..300) : ', $)
read (*,*) isat
c
if(isat.eq.0) go to 500
c
isat = max( 1,isat)
isat = min(299,isat)
c
nc1 = 10
c
nc = nc1
if(isat.gt.100) nc = (nc1*isat)/ 100
if(isat.gt.200) nc = (nc1*200 )/(300-isat) + 1
c
sat = float(isat) / 100.0
c
c
c---- R,G,B unit vectors for projection onto x-y cutting plane
xr = -sat
yr = -sat/sqrt(3.0)
c
xg = 0.0
yg = sat*2.0/sqrt(3.0)
c
xb = sat
yb = -sat/sqrt(3.0)
c
call COLORMAPDEFAULT
c
call PLOPEN(0.8,0,1)
c
call PLOT(5.5, 4.25, -3)
call NEWFACTOR(3.0)
c
c
area = sat * 2.0*sqrt(3.0)
c
xdel = sat* 2.0 /float(nc)
ydel = sat*sqrt(3.0)/float(nc)
c
do 10 j = 1, nc
y0 = yr + ydel*float(j-1)
c
do 105 i = 1, nc-j+1
x0 = xr + xdel*(float(i-1) + 0.5*float(j-1))
c
xx = x0 + 0.5*xdel
yy = y0 + ydel/3.0
c
r = ((xg-xb)*(yy-yb) - (yg-yb)*(xx-xb))/area
g = ((xb-xr)*(yy-yr) - (yb-yr)*(xx-xr))/area
b = ((xr-xg)*(yy-yg) - (yr-yg)*(xx-xg))/area
c
ir = int(256.0*r)
ig = int(256.0*g)
ib = int(256.0*b)
c
if( lok(ir,ig,ib) ) then
x(1) = x0
y(1) = y0
x(2) = x0 + xdel
y(2) = y0
x(3) = x0 + xdel*0.5
y(3) = y0 + ydel
x(4) = x0
y(4) = y0
n = 4
c
call NEWCOLORRGB(ir,ig,ib)
call POLYLINE(x,y,n,1)
endif
c
c
if(i.eq.nc-j+1) go to 105
xx = x0 + xdel
yy = y0 + 2.0*ydel/3.0
c
r = ((xg-xb)*(yy-yb) - (yg-yb)*(xx-xb))/area
g = ((xb-xr)*(yy-yr) - (yb-yr)*(xx-xr))/area
b = ((xr-xg)*(yy-yg) - (yr-yg)*(xx-xg))/area
c
ir = int(256.0*r)
ig = int(256.0*g)
ib = int(256.0*b)
c
if( lok(ir,ig,ib) ) then
x(1) = x0 + xdel
y(1) = y0
x(2) = x0 + xdel*1.5
y(2) = y0 + ydel
x(3) = x0 + xdel*0.5
y(3) = y0 + ydel
x(4) = x0 + xdel
y(4) = y0
n = 4
c
call NEWCOLORRGB(ir,ig,ib)
call POLYLINE(x,y,n,1)
endif
c
105 continue
10 continue
c
call PLFLUSH
c
write(*,*) 'Click on colors...'
C
200 call GETCURSORXY(xx,yy,chkey)
c
r = ((xg-xb)*(yy-yb) - (yg-yb)*(xx-xb))/area
g = ((xb-xr)*(yy-yr) - (yb-yr)*(xx-xr))/area
b = ((xr-xg)*(yy-yg) - (yr-yg)*(xx-xg))/area
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 1
c
500 call PLOT(0.0,0.0,+999)
stop
C
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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