ggplot2: Şu anda efsane

Question

düzeninin değiştirilmesi, varsayılan olarak efsane şöyle görünür:

Legend Title 
x-1 
y-2 
z-3 

Ama şöyle bir şey görünmesi mümkün mü?

Legend Title 
x-1 y-2 z-3 

Answer 1

ve işte bir saldırıdır. olsa hatalar olabilir:

build_legend <- function(name, mapping, layers, default_mapping, theme) { 
    legend_data <- plyr::llply(layers, build_legend_data, mapping, default_mapping) 

    # determine if the elements are aligned horizontally or vertically 
    horiz<-(!is.null(theme$legend.align) && theme$legend.align=="horizontal") 

    # Calculate sizes for keys - mainly for v. large points and lines 
    size_mat <- do.call("cbind", plyr::llply(legend_data, "[[", "size")) 
    if (is.null(size_mat)) { 
    key_sizes <- rep(0, nrow(mapping)) 
    } else { 
    key_sizes <- apply(size_mat, 1, max) 
    } 

    title <- theme_render(
    theme, "legend.title", 
    name, x = 0, y = 0.5 
) 

             # Compute heights and widths of legend table 
    nkeys <- nrow(mapping) 
    hgap <- vgap <- unit(0.3, "lines") 

    numeric_labels <- all(sapply(mapping$.label, is.language)) || suppressWarnings(all(!is.na(sapply(mapping$.label, "as.numeric")))) 
    hpos <- numeric_labels * 1 

    labels <- lapply(mapping$.label, function(label) { 
    theme_render(theme, "legend.text", label, hjust = hpos, x = hpos, y = 0.5) 
    }) 

    # align horizontally 
    if(!horiz){ 
    label_width <- do.call("max", lapply(labels, grobWidth)) 
    label_width <- convertWidth(label_width, "cm") 
    label_heights <- do.call("unit.c", lapply(labels, grobHeight)) 
    label_heights <- convertHeight(label_heights, "cm") 

    width <- max(unlist(plyr::llply(legend_data, "[[", "size")), 0) 
    key_width <- max(theme$legend.key.size, unit(width, "mm")) 

    widths <- unit.c(
        hgap, key_width, 
        hgap, label_width, 
        max(
         unit(1, "grobwidth", title) - key_width - label_width, 
         hgap 
         ) 
        ) 
    widths <- convertWidth(widths, "cm") 

    heights <- unit.c(
         vgap, 
         unit(1, "grobheight", title), 
         vgap, 
         unit.pmax(
           theme$legend.key.size, 
           label_heights, 
           unit(key_sizes, "mm") 
           ), 
         vgap 
        ) 
    heights <- convertHeight(heights, "cm") 

    }else{ 
    label_width <- do.call("unit.c", lapply(labels, grobWidth)) 
    label_width <- convertWidth(label_width, "cm") 
    label_heights <- do.call("max", lapply(labels, grobHeight)) 
    label_heights <- convertHeight(label_heights, "cm") 

    height <- max(unlist(plyr::llply(legend_data, "[[", "size")), 0) 
    key_heights <- max(theme$legend.key.size, unit(height, "mm")) 

    key_width <- unit.pmax(theme$legend.key.size, unit(key_sizes, "mm")) 
    # width of (key gap label gap) x nkeys 
    kglg_width<-do.call("unit.c",lapply(1:length(key_width), function(i)unit.c(key_width[i], hgap, label_width[i], hgap))) 
    widths <- unit.c(
         hgap, 
         kglg_width, 
         max(
          unit(0,"lines"), 
          unit.c(unit(1, "grobwidth", title) - (sum(kglg_width) - hgap)) 
         ) 
        ) 
    widths <- convertWidth(widths, "cm") 

    heights <- unit.c(
         vgap, 
         unit(1, "grobheight", title), 
         vgap, 
         max(
          theme$legend.key.size, 
          label_heights, 
          key_heights 
          ), 
         vgap 
         ) 
    heights <- convertHeight(heights, "cm") 

    } 

    # Layout the legend table 
    legend.layout <- grid.layout(
    length(heights), length(widths), 
    widths = widths, heights = heights, 
    just = c("left", "centre") 
) 

    fg <- ggname("legend", frameGrob(layout = legend.layout)) 
    fg <- placeGrob(fg, theme_render(theme, "legend.background")) 

    fg <- placeGrob(fg, title, col = 2:(length(widths)-1), row = 2) 
    for (i in 1:nkeys) { 

    if(!horiz){ 
     fg <- placeGrob(fg, theme_render(theme, "legend.key"), col = 2, row = i+3) 
    }else{ 
     fg <- placeGrob(fg, theme_render(theme, "legend.key"), col = 1+(i*4)-3, row = 4) 
    } 

    for(j in seq_along(layers)) { 
     if (!is.null(legend_data[[j]])) { 
     legend_geom <- Geom$find(layers[[j]]$geom$guide_geom()) 
     key <- legend_geom$draw_legend(legend_data[[j]][i, ], 
      c(layers[[j]]$geom_params, layers[[j]]$stat_params)) 
     if(!horiz){ 
      fg <- placeGrob(fg, ggname("key", key), col = 2, row = i+3) 
     }else{ 
      fg <- placeGrob(fg, ggname("key", key), col = 1+(i*4)-3, row = 4) 
     } 
     } 
    } 
    label <- theme_render(
     theme, "legend.text", 
     mapping$.label[[i]], hjust = hpos, 
     x = hpos, y = 0.5 
    ) 
    if(!horiz){ 
     fg <- placeGrob(fg, label, col = 4, row = i+3) 
    }else{ 
     fg <- placeGrob(fg, label, col = 1+(i*4)-1, row = 4) 
    } 
    } 
    fg 
} 

assignInNamespace("build_legend", build_legend, "ggplot2") 

# test and usage 
# specify by opts(legend.align="horizontal") 
p1<-qplot(mpg, wt, data=mtcars, colour=cyl)+opts(legend.align="horizontal",legend.position="bottom") 
p2<-qplot(mpg, wt, data=mtcars, colour=cyl) 

Answer 2

"horizontal" seçeneğiyle guide_legends_box gibi bir şey var, ancak çalışmasını alamıyorum.

> d <- qplot(carat, price, data=dsamp, colour=clarity) + 
+ scale_color_hue("clarity") + 
+ guide_legends_box("clarity",horizontal=T) 

verir:

Hata ölçekler $ legend_desc içinde: $ operatörü atom vektörler

için geçersiz Belki de yanlış burada neler olduğunu biliyoruz. Şahsen belgede sözü edilen işlevselliğin bir kısmının henüz uygulanmadığını düşünüyorum.

Answer 3

Günümüzde sadece legend.direction = "yatay" kullanabilirsiniz. Örneğin:

son ggplot2, opts theme() lehine kaldırıldı

qplot(carat, price, data=diamonds, colour=color) + opts(legend.position="top", legend.direction="horizontal") 

Answer 4

:

qplot(carat, price, data=diamonds, colour=color) + 
    theme(legend.position="top", legend.direction="horizontal")