TeachingDemos | Bioinformatics related demos and tutorials | Learning library
kandi X-RAY | TeachingDemos Summary
kandi X-RAY | TeachingDemos Summary
Bioinformatics related demos and tutorials using the R programming language.
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QUESTION
I was wondering if there is a simple way to add text labels with a contrasting background to an R plot using the base graphic system. Until now I have always used the rect()
function together with graphics::strheight()
and graphics::strwidth()
to separately create the background box on which I then place my text using text()
:
ANSWER
Answered 2017-Jul-28 at 21:11Base graphics
Using legend
:
QUESTION
I use R as a GIS here, to create a map. It's a monochrome (black/white) site plan. However, I want to distinguish forests from other areas using these open triangular symbols for coniferous forests that are quite common in cartography in the german speaking world.
A bit of research led me to the my.symbols
function from the TeachingDemos
package. I understood one could write a function plotting the desired symbol in a xlim = c(-1,1)
, ylim = c(-1,1)
plot and then use TeachingDemos::my.symbols
to add this symbol as with the points
function to a plot. My plan was to give TeachingDemos::my.symbols
the coordinates of a grid inside the forest areas.
I managed to write a function which plots the symbol:
...ANSWER
Answered 2017-Apr-08 at 13:34You can use library sp
to sample points in a specific polygon. In my example, I select a specific polygon according to NAME
.
Then you can use library emojifont
to add some symbols from emoji or fontawesome. You can find trees in the list like evergreen_tree
for instance. Or you can plot your own png image repeatedly.
So, first create you grid for a specific polygon :
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