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#
# fields is a package for analysis of spatial data written for
# the R software environment.
# Copyright (C) 2024 Colorado School of Mines
# 1500 Illinois St., Golden, CO 80401
# Contact: Douglas Nychka, douglasnychka@gmail.com,
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with the R software environment if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
# or see http://www.r-project.org/Licenses/GPL-2
##END HEADER
addColorBarTriangle <- function(lowerColor=NULL,
upperColor=NULL,
horizontal=TRUE) {
usr<- par()$usr
plt<- par()$plt
par(xpd=TRUE)
if(horizontal){
deltaY<- (usr[4] - usr[3])
unitX<- (usr[2] - usr[1])/(plt[2] - plt[1])
deltaX<- unitX*(plt[4] - plt[3])
}
else{
deltaX<- (usr[2] - usr[1])
unitY<- (usr[4] - usr[3])/(plt[4] - plt[3])
deltaY<- unitY*(plt[2] - plt[1])
}
#
if( !is.null(upperColor) ){
if(horizontal){
triangleUpper<- rbind(
c( usr[2], usr[3] ),
c( usr[2]+ deltaX, usr[3] + deltaY/2 ),
c( usr[2], usr[4])
)
}
else{
triangleUpper<- rbind( c( usr[1], usr[4] ),
c( usr[1] + deltaX/2, usr[4] + deltaY ),
c( usr[2], usr[4])
)
}
polygon( triangleUpper, col=upperColor, border=upperColor)
lines(triangleUpper)
}
#
if(!is.null(lowerColor)){
if(horizontal){
triangleLower<- rbind( c( usr[1], usr[3] ),
c( usr[1]- deltaX, usr[3] + deltaY/2 ),
c( usr[1], usr[4])
)
}
else{
triangleLower<- rbind( c( usr[1], usr[3] ),
c( usr[1]+ deltaX/2, usr[3] - deltaY ),
c( usr[2], usr[3])
)
}
polygon( triangleLower, col=lowerColor, border=lowerColor)
lines(triangleLower)
}
#
par(xpd=FALSE)
}
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