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| library(string2path) | |
| library(ggplot2) | |
| library(dplyr) | |
| # Note: it seems Noto Color Emoji has many variants. Only that of COLRv1 format | |
| # is supported, so this might not work on installed font of Noto Color Emoji. | |
| ttf <- "~/../Downloads/Noto_Color_Emoji/NotoColorEmoji-Regular.ttf" | |
| d <- string2fill("🐯", ttf) | |
| d2 <- string2path("🐯", ttf) | |
| colours_orig <- unique(d2$color) | |
| n_colours <- length(colours_orig) | |
| colours <- purrr::flatten_chr(lapply(LETTERS[1:8], \(x) scales::pal_viridis(option = x)(n_colours))) | |
| colours <- c(colours_orig, colours) | |
| xlim <- range(d$x) | |
| xlim <- xlim + diff(xlim) * c(-0.2, 0.2) | |
| ylim <- range(d$y) | |
| ylim <- ylim + diff(ylim) * c(-0.2, 0.2) | |
| rotate_and_enlarge <- function(d, rot, scale) { | |
| d |> | |
| # 平行移動 | |
| mutate( | |
| x = x - 0.5, | |
| y = y - 0.3 | |
| ) |> | |
| # 回転と拡大 | |
| mutate( | |
| x_new = scale * (x * cos(rot) - y * sin(rot)), | |
| y_new = scale * (x * sin(rot) + y * cos(rot)), | |
| ) |> | |
| mutate( | |
| x = x_new + 0.5, | |
| y = y_new + 0.3 | |
| ) | |
| } | |
| steps <- 180 | |
| cycle <- 2 | |
| t <- \(x) pmax(x - steps * cycle * 0.2, 0)^1.2 / steps^1.2 | |
| png_path <- file.path(tempdir(), "frame%03d.png") | |
| png(png_path, width = 800, height = 600) | |
| for (i in 0:(steps * cycle)) { | |
| phase <- t(i) | |
| offset <- as.integer(n_colours * 8 * phase * 0.6) %% (n_colours * 9) | |
| rot <- 2.0 * pi * phase | |
| scale <- 1.0 + (1.0 * phase)^2 | |
| d_tmp <- rotate_and_enlarge(d, rot, scale) | |
| d2_tmp <- rotate_and_enlarge(d2, rot, scale) | |
| p <- ggplot() + | |
| geom_polygon(data = d_tmp, aes(x, y, group = triangle_id, fill = color)) + | |
| geom_path(data = d2_tmp, aes(x, y, group = path_id), colour = alpha("white", 0.7)) + | |
| coord_equal(xlim = xlim, ylim = ylim) + | |
| theme_minimal() + | |
| scale_fill_manual(values = setNames(colours[offset:(offset+6)], nm = colours_orig)) | |
| plot(p) | |
| } | |
| dev.off() | |
| png_files <- sprintf(png_path, (0:(steps * cycle) + 1)) | |
| gifski::gifski(png_files, delay = 1/60) | |
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