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| # hex sticker script (issue 185) | ||
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| ## Get a background map, here of Kichijoji in Tokyo | ||
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| ```{r} | ||
| library (osmdata) | ||
| library (osmplotr) | ||
| library (magrittr) | ||
| bb <- getbb ("kichijoji japan") | ||
| bb [2, 1] <- bb [2, 1] - 0.2 * diff (bb [2, ]) | ||
| bb [2, 2] <- mean (bb [2, ]) | ||
| hw <- opq (bb) %>% | ||
| add_osm_feature (key = "highway") %>% | ||
| osmdata_sf (quiet = FALSE) %>% | ||
| osm_poly2line () %>% | ||
| extract2 ("osm_lines") | ||
| b <- opq (bb) %>% | ||
| add_osm_feature (key = "building") %>% | ||
| osmdata_sf (quiet = FALSE) %>% | ||
| extract2 ("osm_polygons") | ||
| g1 <- opq (bb) %>% | ||
| add_osm_feature (key = "landuse", value = "grass") %>% | ||
| osmdata_sf (quiet = FALSE) %>% | ||
| extract2 ("osm_polygons") | ||
| g2 <- opq (bb) %>% | ||
| add_osm_feature (key = "leisure", value = "park") %>% | ||
| osmdata_sf (quiet = FALSE) %>% | ||
| extract2 ("osm_polygons") | ||
| g <- sf::st_sf (osm_id = c (g1$osm_id, g2$osm_id), | ||
| geometry = c (g1$geometry, g2$geometry)) | ||
| w <- opq (bb) %>% | ||
| add_osm_feature (key = "natural", value = "water") %>% | ||
| osmdata_sf (quiet = FALSE) %>% | ||
| extract2 ("osm_polygons") | ||
| #osm_structures (col_scheme = "light") | ||
| map <- osm_basemap (bbox = bb, bg = "gray95") %>% | ||
| add_osm_objects (hw, col = "#969696FF") %>% | ||
| add_osm_objects (b, col = "#C8C8C8FF") %>% | ||
| add_osm_objects (g, col = "#C8FFC8FF") %>% | ||
| add_osm_objects (w, col = "#C8C8DCFF") | ||
| #print_osm_map (map, filename = "kichijoji.png") | ||
| saveRDS (map, file = "map.Rds") | ||
| ``` | ||
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| Reduce image to square: | ||
| ```{r} | ||
| library (magrittr) | ||
| map <- readRDS ("map.Rds") | ||
| f <- "kichijoji.png" | ||
| osmplotr::print_osm_map (map, filename = f) | ||
| magick::image_read (f) %>% | ||
| magick::image_trim () %>% | ||
| magick::image_write (f) | ||
| i <- magick::image_read (f) %>% | ||
| magick::image_info () | ||
| chop <- floor (i$width - i$height) / 2 | ||
| chop <- paste0 (i$height, "x", i$height, "+", chop, "+0") | ||
| magick::image_read (f) %>% | ||
| magick::image_crop (chop) %>% | ||
| magick::image_write (f) | ||
| ``` | ||
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| # crop image to hex | ||
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| image is 1260 h X 2100 w | ||
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| ```{r} | ||
| f <- "kichijoji.png" | ||
| library (magrittr) | ||
| img <- png::readPNG (f) | ||
| # define hexagon and set all outer pixels to 1 | ||
| s3 <- sqrt (3) / 2 | ||
| border <- data.frame (x = 1 + c (rep (-s3, 2), 0, rep (s3, 2), 0, -s3), | ||
| y = 1 + c (0.5, -0.5, -1, -0.5, 0.5, 1, 0.5)) | ||
| border$x <- round (dim (img) [2] * border$x / 2) | ||
| border$y <- round (dim (img) [1] * border$y / 2) | ||
| #h <- 7 | ||
| #w <- h * diff (range (border$x)) / diff (range (border$y)) | ||
| #x11 (width = w, height = h) | ||
| #plot (border, type = "l") | ||
| border | ||
| library (sp) | ||
| library (raster) | ||
| p <- Polygon (border) | ||
| p <- SpatialPolygons (list (Polygons (list (p), "p"))) | ||
| n1 <- dim (img) [1] | ||
| n2 <- dim (img) [2] | ||
| r <- raster (nrows = n1, ncols = n2, xmn = 1, xmx = n2, ymn = 1, ymx = n1, | ||
| vals = TRUE) | ||
| r [mask (r, p)] <- FALSE | ||
| r <- !r | ||
| #plot (r) | ||
| r <- as.matrix (r) | ||
| index <- which (!r) | ||
| index_not <- which (r) | ||
| for (i in 1:3) { | ||
| i1 <- img [, , i] | ||
| i1 [index] <- 0 | ||
| img [, , i] <- i1 | ||
| } | ||
| mmand::display (img) | ||
| # Then add a 4th channel for alpha values | ||
| img4 <- array (dim = c (dim (img) [1:2], 4)) | ||
| for (i in 1:3) { | ||
| i1 <- img [, , i] | ||
| img4 [, , i] <- i1 | ||
| i1 [index] <- 0 | ||
| i1 [index_not] <- 1 | ||
| img4 [, , 4] <- i1 | ||
| } | ||
| png::writePNG (img4, f) | ||
| ``` | ||
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| ## make the hex logo | ||
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| ```{r} | ||
| library (ggplot2) | ||
| # trace outline of hexagon from centre bottom point in anti-clockwise direction | ||
| s3 <- sqrt (3) / 2 | ||
| border <- data.frame (x = 1 + c (rep (-s3, 2), 0, rep (s3, 2), 0, -s3), | ||
| y = 1 + c (0.5, -0.5, -1, -0.5, 0.5, 1, 0.5)) | ||
| asp <- diff (range (border$x)) / diff (range (border$y)) # aspect ratio for image | ||
| f <- "kichijoji.png" | ||
| d <- data.frame(x = 1, y = 1, image = f) | ||
| size <- 1.0 | ||
| hex <- ggplot() + | ||
| ggimage::geom_image (aes_ (x = ~x, y = ~y, image = ~image), d, | ||
| size = 1.05, asp = asp) + | ||
| geom_polygon (aes_ (x = ~x, y = ~y), data = border, | ||
| size = 5, fill = NA, color = "#555555") | ||
| #extrafont::loadfonts () | ||
| lab_dat <- data.frame (x = 1 - 0.0001, | ||
| y = 1 + 0.0001, | ||
| lab = 'osmdata') | ||
| aes <- ggplot2::aes (x, y, label = lab) | ||
| fs <- 30 # font size | ||
| hex <- hex + ggplot2::geom_text (dat = lab_dat, | ||
| mapping = aes, | ||
| size = fs, | ||
| colour = 'gray80', | ||
| family = 'SF Alien Encounters', | ||
| fontface = 1, | ||
| nudge_y = 0.0001, | ||
| nudge_x = 0.0001) | ||
| hex <- hex + ggplot2::geom_text (dat = lab_dat, | ||
| mapping = aes, | ||
| size = fs, | ||
| colour = 'black', | ||
| fontface = 1, | ||
| family = 'SF Alien Encounters') | ||
| th <- theme_minimal () | ||
| th$panel.background <- element_rect (fill = "transparent", size = 0) | ||
| th$line <- element_blank () | ||
| th$axis.text <- element_blank () | ||
| th$axis.title <- element_blank () | ||
| th$plot.margin <- margin (rep (unit (0, 'null'), 4)) | ||
| #th$plot.margin <- margin (rep (unit (-0.5, 'line'), 4)) | ||
| th$legend.position <- 'none' | ||
| th$axis.ticks.length <- unit (0, 'null') | ||
| hex <- hex + th | ||
| print (hex) | ||
| ``` | ||
| ```{r} | ||
| fname <- file.path (here::here (), "man", "figures", "osmhex.png") | ||
| ggsave (hex, filename = fname, width = 7, height = 7 * asp) | ||
| ``` | ||
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| it is then necessary to read the png back in and re-convert the border pixels | ||
| to alpha = 0 | ||
| ```{r} | ||
| fname <- file.path (here::here (), "man", "figures", "osmhex.png") | ||
| img <- png::readPNG (fname) | ||
| img4 <- array (1, dim = c (dim (img) [1:2], 4)) | ||
| index_out <- which (img [, , 1] == 1 & img [, , 2] == 1 & img [, , 3] == 1) | ||
| index_in <- which (!seq (img [, , 1]) %in% index_out) | ||
| for (i in 1:3) { | ||
| i1 <- img [, , i] | ||
| img4 [, , i] <- i1 | ||
| i1 [index_in] <- 1 | ||
| i1 [index_out] <- 0 | ||
| img4 [, , 4] <- i1 | ||
| } | ||
| fname <- file.path (here::here (), "man", "figures", "osmhex.png") | ||
| png::writePNG (img4, fname) | ||
| ``` | ||
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