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# Drawing Grids in R

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Hortonworks Sandbox for HDP and HDF is your chance to get started on learning, developing, testing and trying out new features. Each download comes preconfigured with interactive tutorials, sample data and developments from the Apache community.

Here's an example of how to draw a grid in R and how to fill it.
I did use the grid-package and its functions for displaying species cover values at squares of a recording frame...

library(grid)

dat <- data.frame(x = rep(seq(0, 0.8, 1/5), 5),
y = rep(seq(0, 0.8, 1/5), each = 5),
val = rnorm(25, 20, 5))

# making relative values (%) to be used for color-gradiation in plot
dat\$rel <- 100 * dat\$val / max(dat\$val)

# creating grey-tones relative to val -
# maximum greytone is relative to the val-maximum
# i use the reciprocal to get darker tones for higher values:
dat\$col<-paste("grey", 100 - round(dat\$rel, 0), sep = "")

# opening the graphic device and
# setting up a viewport with borders:
grid.newpage()
vp1 <- viewport(x = 0.1, y = 0.1, w = 0.8, h = 0.8,
just = c("left", "bottom"), name = "vp1")

# plotting rectangles using x/y positions
grid.rect(x=dat\$x,y=dat\$y,height=1/5,width=1/5,hjust=0,vjust=0,vp=vp1,
gp=gpar(col=1, fill=as.character(dat\$col)))

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