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p5 in R

Edward Visel

1 minute read

p5.js is a version of Processing built natively in JavaScript. It’s really, really awesome.

Sean Kross wrote R bindings for p5.js in his p5 package so it can be written and R and published as an htmlwidget. This is a little exploration of how it works.

library(p5)

# runs once at start
setup_ <- setup() %>% 
    createCanvas(500, 500) %>% 
    noStroke()

# reruns every frame
draw_ <- draw() %>% 
    background('#888') %>% 
    fill(rgb(1, 1, 1, 0.5)) %>% 
    ellipse(~mouseX, ~height / 2, ~mouseY, ~mouseY) %>% 
    fill(rgb(0, 0, 0, 0.5)) %>% 
    ellipse(~width - mouseX, ~height / 2, ~width - mouseY, ~width - mouseY)

sketch(setup = setup_, draw = draw_)


Adapted from Casey Reas and Ben Fry’s “Interactivity” Processing tutorial for p5 and R.

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