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#' Create a style catalogue | ||
#' | ||
#' Create a style catalogue for each predefined tmap style. The result is a set of png images, one for each style. | ||
#' | ||
#' @param path path where the png images are stored | ||
#' @param styles vector of styles function names (see \code{\link{tmap_style}}) for which a preview is generated. By default, a preview is generated for all loaded styles. | ||
#' @import grid | ||
#' @rdname tmap_style_catalogue | ||
#' @export | ||
tmap_style_catalogue <- function(path="./tmap_style_previews", styles=NA) { | ||
# get all styles | ||
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styles <- get_style_names() | ||
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ns <- length(styles) | ||
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if (!file.exists(path)) dir.create(path, recursive=TRUE) | ||
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# load and process data | ||
World <- metro <- rivers <- land <- NULL | ||
data(World, metro, rivers, land, envir = environment()) | ||
metro$growth <- (metro$pop2020 - metro$pop2010) / (metro$pop2010 * 10) * 100 | ||
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rivers <- sf::st_transform(rivers, st_crs(World)) | ||
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pb <- txtProgressBar() | ||
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print_style <- function(style, i) { | ||
on.exit(dev.off()) | ||
png(file.path(path, paste0(style, ".png")), width=1920, height=1080) | ||
grid.newpage() | ||
pushViewport(viewport(layout = grid.layout(3,3))) | ||
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# set progress bar init | ||
pbi <- (i-1)/ns | ||
pbii <- function(i) pbi + (i/9) * (1/ns) | ||
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# first column | ||
print(tm_shape(World) + | ||
tm_polygons() + | ||
tm_text("iso_a3", size="AREA") + | ||
tm_symbols() + | ||
tm_shape(rivers) + | ||
tm_lines() + | ||
tm_compass() + | ||
tm_scale_bar() + | ||
tm_style(style) + tm_format("World", title="Fixed aesthetics"), | ||
vp = viewport(layout.pos.row = 1, layout.pos.col = 1)) | ||
setTxtProgressBar(pb, pbii(1)) | ||
print(tm_shape(World) + | ||
tm_borders() + | ||
tm_text("name", size="AREA") + | ||
tm_style(style) + tm_format("World", title="Polygon borders with text"), | ||
vp = viewport(layout.pos.row = 2, layout.pos.col = 1)) | ||
setTxtProgressBar(pb, pbii(2)) | ||
print(tm_shape(rivers, bbox = bb(World)) + | ||
tm_lines() + | ||
tm_style(style) + tm_format("World", title="Lines only"), | ||
vp = viewport(layout.pos.row = 3, layout.pos.col = 1)) | ||
setTxtProgressBar(pb, pbii(3)) | ||
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# second column | ||
print(tm_shape(World) + | ||
tm_polygons("MAP_COLORS", ncols=5) + | ||
tm_style(style) + tm_format("World", title="Map coloring"), | ||
vp = viewport(layout.pos.row = 1, layout.pos.col = 2)) | ||
setTxtProgressBar(pb, pbii(4)) | ||
print(tm_shape(World) + | ||
tm_polygons() + | ||
tm_shape(metro) + | ||
tm_dots() + | ||
tm_grid(projection = 4326) + | ||
tm_style(style) + tm_format("World", title="Dot map"), | ||
vp = viewport(layout.pos.row = 2, layout.pos.col = 2)) | ||
setTxtProgressBar(pb, pbii(5)) | ||
print(tm_shape(World) + | ||
tm_polygons() + | ||
tm_shape(metro) + | ||
tm_symbols(size = "pop2010", col = "growth", breaks = c(-Inf, -2, -1, -.5, .5, 1, 2, Inf), midpoint = 0) + tm_style(style) + tm_format("World", title="symbol map"), | ||
vp = viewport(layout.pos.row = 3, layout.pos.col = 2)) | ||
setTxtProgressBar(pb, pbii(6)) | ||
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# third column | ||
print(tm_shape(World) + | ||
tm_polygons("gdp_cap_est", breaks=c(0, 10000, 20000, 30000, 40000, 50000, Inf)) + | ||
tm_text("iso_a3", size="AREA") + tm_style(style) + tm_format("World", title="Choropleth"), | ||
vp = viewport(layout.pos.row = 1, layout.pos.col = 3)) | ||
setTxtProgressBar(pb, pbii(7)) | ||
print(tm_shape(World) + | ||
tm_polygons("HPI", palette="div", n=9) + | ||
tm_text("iso_a3", size="AREA") + tm_style(style) + tm_format("World", title="Choropleth (diverging)"), | ||
vp = viewport(layout.pos.row = 2, layout.pos.col = 3)) | ||
setTxtProgressBar(pb, pbii(8)) | ||
print(tm_shape(World) + | ||
tm_polygons("economy") + | ||
tm_text("iso_a3", size="AREA") + tm_style(style) + tm_format("World", title="Categorical map"), | ||
vp = viewport(layout.pos.row = 3, layout.pos.col = 3)) | ||
setTxtProgressBar(pb, pbii(9)) | ||
upViewport() | ||
} | ||
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mapply(print_style, styles, 1:ns) | ||
if (get("tmapOptions", envir = .TMAP)$show.messages) message("\nCatalogue created in ", normalizePath(path)) | ||
invisible() | ||
} | ||
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#' @export | ||
#' @rdname tmap_style_catalogue | ||
tmap_style_catalog <- tmap_style_catalogue | ||
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