Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

Drawing Grids in R

DZone's Guide to

Drawing Grids in R

· Big Data Zone
Free Resource

Need to build an application around your data? Learn more about dataflow programming for rapid development and greater creativity. 

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)))







Check out the Exaptive data application Studio. Technology agnostic. No glue code. Use what you know and rely on the community for what you don't. Try the community version.

Topics:

Published at DZone with permission of Kay Cichini, DZone MVB. See the original article here.

Opinions expressed by DZone contributors are their own.

THE DZONE NEWSLETTER

Dev Resources & Solutions Straight to Your Inbox

Thanks for subscribing!

Awesome! Check your inbox to verify your email so you can start receiving the latest in tech news and resources.

X

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}