fabricerin v0.1.1

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Create Easily Canvas in 'shiny' and 'RMarkdown' Documents

Allows the user to implement easily canvas elements within a 'shiny' app or an 'RMarkdown' document. The user can create shapes, images and text elements within the canvas which can also be used as a drawing tool for taking notes. The package relies on the 'fabricjs' 'JavaScript' library. See <http://fabricjs.com/>.

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fabricerin

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The fabricerin (spelled fabrikerine) package allows you to create easily canvas elements within your Shiny app and RMarkdown documents. You can use the canvas to render shapes, images and text. You can also create a canvas for drawing/taking notes purposes. Under the hoods, fabricerin relies on the the fabricjs JavaScript library.

Installation

You can install the development version from GitHub with:

# install.packages("remotes")

remotes::install_github("feddelegrand7/fabricerin")

Examples:

First of all, I’d like to state that all the example provided apply the same way to Shiny and Rmd documents. Secondly, in order to use fabricerin, you always have to run the use_fabric() function at the beginning of your app/document. The function activates the fabricjs library. Note that you’ll need to be connected to the internet. Finally, fabricerin is not an R wrapper for the fabricjs library. The package doesn’t cover all the capabilities of the library. The fabricerin package only relies on some specified features that according to me will help Shiny/Rmd users. Of course, if you need some improvement, feel free to create a Pull Request.

fabric_drawing(): Create a canvas for taking notes


library(shiny)
library(fabricerin)


ui <- fluidPage(


  use_fabric(), # do not forget to include the use_fabric() function at the beginning of your document

  h1("You can take some notes below"), 

  fabric_drawing(cid = "canvas1", 
                drawingColor = "darkblue", 
                gumSize = 50)
)

server <- function(input, output){}

shinyApp(ui, server)

fabric_shape(): Render shape objects in canvas


Currently, fabricerin supports three types of shapes: Rectangle, Triangle, Circle and Polygon. The user can interact with the shape and modify its position, size and rotation. If you want to disable this interactivity, you can set selectable =FALSE


library(shiny)
library(fabricerin)


ui <- fluidPage(


  use_fabric(), # do not forget to include the use_fabric() function at the beginning of your document

  fabric_shape(cid = "canvaId", # canvas id
               cfill = "orange", # canvas color
               cwidth = 800, # the width of the canvas
               cheight = 600, # the height of the canvas
               shapeId = "shapeId", # shape id
               shape = "Rect", 
               fill = "red", # shape color
               width = 400, 
               height = 400, 
               left = 100, # the position of the shape from the left relative to the canvas
               top = 100, # the position of the shape from the top relative to the canvas
               strokecolor = "darkblue", 
               strokewidth = 5, 
               selectable = TRUE)

)

server <- function(input, output){}

shinyApp(ui, server)

You can add as many shape as you want to an existing canvas using the fabric_shape_add() function. Don’t forget to reference the preexisting canvas with its ID:

library(shiny)
library(fabricerin)


ui <- fluidPage(


  use_fabric(), # do not forget to include the use_fabric() function at the beginning of your document

  fabric_shape(cid = "canvaId", 
               shapeId = "cr1", 
               shape = "Circle", 
               radius = 30, 
               left = 100), 

  fabric_shape_add(cid = "canvaId", 
                   shapeId = "cr2", 
                   shape = "Circle", 
                   radius = 30, 
                   left = 200),

  fabric_shape_add(cid = "canvaId", 
                   shapeId = "cr3", 
                   shape = "Circle", 
                   radius = 30, 
                   left = 300),

  fabric_shape_add(cid = "canvaId", 
                   shapeId = "cr4", 
                   shape = "Circle", 
                   radius = 30, 
                   left = 400)

)

server <- function(input, output){}

shinyApp(ui, server)

fabric_image(): Render images in canvas


You can insert an image within a canvas a play with it using the fabric_image() function. Note that this function accepts only URL external images.


ui <- fluidPage(

use_fabric(),

fabric_image(cid = "cimage",
              cfill = "lightblue",
              imgId = "Rimg",
              imgsrc = "https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/R_logo.svg/724px-R_logo.svg.png")

              )

server <- function(input, output) {}


shinyApp(ui = ui, server = server)

Similar to shapes, you can add images to preexisting canvas using the fabric_image_add() function:

library(shiny)
library(fabricerin)

ui <- fluidPage(

 use_fabric(),

 fabric_image(cid = "cimage",
              imgId = "Rimg",
              imgsrc = "https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/R_logo.svg/724px-R_logo.svg.png",
              imgheight = 200,
              imgwidth = 200),
 fabric_image_add(cid = "cimage",
                  imgId = "rstudioimg",
                  imgsrc = "https://raw.githubusercontent.com/rstudio/hex-stickers/master/PNG/dplyr.png",
                  imgwidth = 200,
                  imgheight = 200,
                  left = 400)
                  )

server <- function(input, output) {}

shinyApp(ui = ui, server = server)

fabric_text(): Render text elements in canvas


The fabric_text() function has many arguments, feel free to check them out:


ui <- fluidPage(

use_fabric(),

fabric_text(cid = "cId",
          textId = "text",
          text = " 'But A Hero Is A Guy Who Gives Out The Meat To Everyone Else. \\n I Want To Eat The Damn Meat!' \\n Monkey D. Luffy",
          cfill = "#DD5347",
          left = 120,
          shadowCol = "blue",
          fontSize = 20,
          fontWeight = "bold",
          lineHeight = 3
          )
)
server <- function(input, output) {}

shinyApp(ui = ui, server = server)

Here also, we can use the fabric_text_add() function to incorporate a text object within a canvas element:


library(shiny)
library(fabricerin)


ui <- fluidPage(

use_fabric(),

fabric_shape(cid = "canvas123",
              cfill = "lightblue",
              cwidth = 1000,
              shapeId = "tri1",
              shape = "Triangle",
              fill = "darkblue"),

fabric_text_add(cid = "canvas123",
                 textId = "txt1",
                 text = "This is a darkblue Triangle !",
                 left = 350
                 )

                 )

server <- function(input, output) {}

shinyApp(ui = ui, server = server)

fabric_curtail(): Add a background or an overlay image to a canvas

You can set an image as a background or as a foreground (overlay) for a canvas as follows:


ui <- fluidPage(

 use_fabric(),

 fabric_shape(cid = "canvas123",
              shapeId = "tri1",
              shape = "Triangle",
              fill = "lightblue"),

fabric_curtail(cid = "canvas123",
              imgsrc = "https://st.depositphotos.com/1642482/1904/i/950/depositphotos_19049237-stock-photo-leaf.jpg",
              type = "background"

              )

)

server <- function(input, output) {}


shinyApp(ui = ui, server = server)

Code of Conduct

Please note that the fabricerin project is released with a Contributor Code of Conduct. By contributing to this project, you agree to abide by its terms.

Functions in fabricerin

Name Description
fabric_shape_add Add a shape object to a preexisting canvas element
fabric_shape Create shapes inside a canvas
fabric_text Insert text within canvas element
fabric_curtail Add a background or an overlay image to a preexisting canvas
fabric_text_add Add text within preexisting canvas element
fabric_drawing Create a canvas element for drawing
fabric_image_add Add an image to a preexisting canvas element
use_fabric Activate the fabricjs library
fabric_image Insert external images inside canvas element
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License MIT + file LICENSE
Encoding UTF-8
LazyData true
RoxygenNote 7.1.1
URL https://github.com/feddelegrand7/fabricerin
BugReports https://github.com/feddelegrand7/fabricerin/issues
NeedsCompilation no
Packaged 2020-08-01 14:13:25 UTC; Administrateur
Repository CRAN
Date/Publication 2020-08-02 01:10:09 UTC

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