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### CONVERTS CENTER COORDINATES TO EDGE OF NODE ###:
DrawArrow <- function(x,y,r,angle=pi/4,cex,open=FALSE,lwd=1,lty=1,col="black")
{
r <- r%%(2*pi)
xrange <- abs(diff(par("usr")[1:2]))
yrange <- abs(diff(par("usr")[3:4]))
xmarrange <- sum(par("mai")[c(2,4)])
ymarrange <- sum(par("mai")[c(1,3)])
xin <- par("pin")[1]
yin <- par("pin")[2]
xLeft <- x + ((xin+xmarrange)/xin)*(7/(xin+xmarrange))*(xrange/2.16)*cex*par("csi")*sin(r-angle + pi)/17.5
yLeft <- y + ((yin+ymarrange)/yin)*(7/(yin+ymarrange))*(yrange/2.16)*cex*par("csi")*cos(r-angle + pi)/17.5
xRight <- x + ((xin+xmarrange)/xin)*(7/(xin+xmarrange))*(xrange/2.16)*cex*par("csi")*sin(r+angle + pi)/17.5
yRight <- y + ((yin+ymarrange)/yin)*(7/(yin+ymarrange))*(yrange/2.16)*cex*par("csi")*cos(r+angle + pi)/17.5
if (open)
{
lines(c(xLeft,x,xRight),c(yLeft,y,yRight),lwd=lwd,col=col,lty=lty)
} else {
polygon(c(xLeft,x,xRight),c(yLeft,y,yRight),lwd=lwd,col=col,border=NA)
}
}
## Midpoint of arrow:
ArrowMidPoint <- function(x,y,r,angle=pi/4,cex)
{
r <- r%%(2*pi)
xrange <- abs(diff(par("usr")[1:2]))
yrange <- abs(diff(par("usr")[3:4]))
xmarrange <- sum(par("mai")[c(2,4)])
ymarrange <- sum(par("mai")[c(1,3)])
xin <- par("pin")[1]
yin <- par("pin")[2]
xLeft <- x + ((xin+xmarrange)/xin)*(7/(xin+xmarrange))*(xrange/2.16)*cex*par("csi")*sin(r-angle + pi)/17.5
yLeft <- y + ((yin+ymarrange)/yin)*(7/(yin+ymarrange))*(yrange/2.16)*cex*par("csi")*cos(r-angle + pi)/17.5
xRight <- x + ((xin+xmarrange)/xin)*(7/(xin+xmarrange))*(xrange/2.16)*cex*par("csi")*sin(r+angle + pi)/17.5
yRight <- y + ((yin+ymarrange)/yin)*(7/(yin+ymarrange))*(yrange/2.16)*cex*par("csi")*cos(r+angle + pi)/17.5
mids <- c((xRight+xLeft)/2,(yRight+yLeft)/2)
return(mids)
}
# Radius of arrow in inches:
ArrowRadIn <- function(angle=pi/4,cex)
{
r <- 0
xrange <- abs(diff(par("usr")[1:2]))
yrange <- abs(diff(par("usr")[3:4]))
xmarrange <- sum(par("mai")[c(2,4)])
ymarrange <- sum(par("mai")[c(1,3)])
xin <- par("pin")[1]
yin <- par("pin")[2]
xLeft <- ((xin+xmarrange)/xin)*(7/(xin+xmarrange))*(xrange/2.16)*cex*par("csi")*sin(r-angle + pi)/17.5
yLeft <- ((yin+ymarrange)/yin)*(7/(yin+ymarrange))*(yrange/2.16)*cex*par("csi")*cos(r-angle + pi)/17.5
xRight <- ((xin+xmarrange)/xin)*(7/(xin+xmarrange))*(xrange/2.16)*cex*par("csi")*sin(r+angle + pi)/17.5
yRight <- ((yin+ymarrange)/yin)*(7/(yin+ymarrange))*(yrange/2.16)*cex*par("csi")*cos(r+angle + pi)/17.5
mids <- c(usr2inX2((xRight+xLeft)/2),usr2inY2((yRight+yLeft)/2))
return(sqrt(sum(mids^2)))
}
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