Remove gaps in a stat_density2d ggplot chart without modifying XY limits

Question

When I run this code:

ggplot() + 
  stat_density2d(data = Unit_J, aes(x=X, y=Y, fill=..level.., alpha=0.9), lwd= 0.05, bins=50, col=\"blue\", geom=\"polygon\") +         


        

Answer 1

The trick is to expand the canvas using xlim and ylim so that there is enough room for ggplot to draw complete contours around the data. Then you can use tighter xlim and ylim parameters within the coord_fixed term to show the window you want...

ggplot() + 
  stat_density2d(data = Unit_J, aes(x=X, y=Y, fill=..level.., alpha=0.9), 
                                lwd= 0.05, bins=50, col="blue", geom="polygon") +
  scale_fill_continuous(low="blue",high="darkblue") +
  scale_alpha(range=c(0, 0.03), guide="none") + 
  xlim(-7000,-3500) + ylim(400,2500) + #expanded in x direction
  coord_fixed(expand=FALSE,xlim=c(-6600,-3800),ylim=c(400,2500)) + #added parameters 
  geom_point(data = Unit_J, aes(x=X, y=Y), alpha=0.5, cex=0.4, col="darkblue") + 
  theme_bw() + 
  theme(legend.position="none")