Use ggplot2 in `polar2cart`

[ronnyhdez]

Within the FREddyPro project we can run this to check the example plot:

## Close any previously open graphic devices
graphics.off()

## Load the data
data(fluxes)

## Set the point of origin
x=0;y=0

## Use wind direction, distance and distance from the tower to convert
## to cartesian co-ordinates
pol<-polar2cart(x,y,fluxes$x_90.,fluxes$wind_dir,as.deg=TRUE)

## Plot the distance from the tower
plot(pol,xlab='X (m)',ylab='Y (m)',pch=16,cex=0.6)

## Add also the tower point
points(0,0,col=2,pch=16,cex=1.2)