tests/testthat/test_layers.R

In loon.shiny: Automatically Create a 'Shiny' App Based on Interactive 'Loon' Widgets

context("test layers")
library(loon.shiny)
pdf(NULL)

test_that("test dependent layers", {
  p <- with(olive,
            l_plot(x=linoleic, y=oleic,
                   color=Region, title="Olive Data"))


  ## Layer a Group
  l.g <- l_layer_group(p, label="Drawings", parent="root", index="end")


  ## Layer Points
  l.pts <- l_layer_points(p,
                          x=c(200, 450, 1800),
                          y=c(6000, 8000, 7000),
                          color=c("green", "orange", "lightblue"),
                          parent=l.g)

  l_scaleto_layer(p, l.pts)

  l_scaleto_world(p)

  l_configure(l.pts, color="thistle", size=30)


  l_configure(l.pts,
              x=seq(from=200,to=1600, length.out=20),
              y=seq(from=6000,to=8000, length.out=20),
              color="steelblue", size=20:39)


  l_layer_relabel(p, l.pts, "Different Sizes")
  l_layer_move(p, l.pts, parent="root")


  ## Polygon

  i <- with(olive, chull(linoleic, oleic))

  x.hull <- olive$linoleic[i]
  y.hull <- olive$oleic[i]

  l_layer_polygon(p, x.hull, y.hull, color="thistle",
                  linecolor="black", linewidth=4, parent=l.g)


  ## Rectangle

  l_layer_rectangle(p, x=c(1100, 1300), y=c(7600, 8300), linewidth=2)

  ## Oval

  l_layer_oval(p, x=c(1500, 1750), y=c(7900, 8100),
               color="", linecolor="orange", linewidth=4)

  ## Line

  x <- with(olive, linoleic[Region=="North"])
  y <- with(olive, oleic[Region=="North"])

  fit <- lm(y~x)
  ##summary(fit)

  xr <- seq(from=min(x), to=max(x), length.out=20)
  yp <- predict(fit, data.frame(x=xr), interval="prediction")


  l.pi <- l_layer_polygon(p, x=c(xr, rev(xr)),
                          y=c(yp[,2],rev(yp[,3])),
                          color="lightgreen",
                          linecolor= "darkgreen", linewidth=2,
                          label="predition interval west liguria")

  l.fit <- l_layer_line(p, x=xr, y=yp[,1],
                        color="darkgreen", linewidth=8,
                        label="fit west liguria")

  l_layer_move(p, l.pi, "root", "end")
  l_layer_raise(p, l.pi)


  ## Text (size does not work and color is gray)
  bbox <- l_layer_bbox(p, "root")

  l_layer_texts(p, x=seq(from=bbox[1], to=bbox[3], length.out=length(LETTERS)),
                y=rev(seq(from=bbox[2], to=bbox[4], length.out=length(LETTERS))),
                text=LETTERS, size=seq_along(LETTERS),
                angle=seq_along(LETTERS)/length(LETTERS)*360)
  x <- loon.shiny(p)
  x
  expect_equal(class(x), "shiny.appobj")
})