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How to make part of the legend title bold (not entire legend title)

By : Kristóf Czimer
Date : October 16 2020, 06:10 AM
it fixes the issue matplotlib can render LaTeX! Therefore, you can just use the \bf tag, along with enclosing $ marks to denote a LaTeX expression:
code :
import matplotlib
import matplotlib.pyplot as plt

plt.plot([1,2,3], [4,5,6])
plt.legend([r'Test $\bf{bold}$'])


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Plot legend below the graphs and legend title above the legend in ggplot2

By : Anthony
Date : March 29 2020, 07:55 AM
This might help you In order to achieve that, you will have to use both theme(legend.position="bottom") as well as guide_legend. With the latter you can change the position of the legend title.
code :
ggplot(df) +
  geom_point(aes(x = x, y = y, size=P, colour=Te), alpha=0.7) +
  scale_colour_gradient(low="#00FF33", high ="#FF0000", guide = "colourbar")+
  labs(colour="T", size="P")+
  xlab("x") + ylab("y")+ 
  scale_size(range = c(3, 8)) +
  theme_bw(base_size = 12, base_family = "Helvetica") + 
  theme(panel.grid.minor = element_line(colour="grey", size=0.5),
        axis.text.x = element_text(angle = 45, hjust = 1),
        legend.box="horizontal") +
  guides(colour = guide_colourbar(title.position="top", title.hjust = 0.5),
         size = guide_legend(title.position="top", title.hjust = 0.5))

Adjusting legend.title ,legend.text and legend color in ggplot2

By : алексей лашнев
Date : March 29 2020, 07:55 AM
I hope this helps you . Something like the following should work. Just specify the legend title explicitly and add \n at the end of the string, which adds an extra blank row:
code :
ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width, col=Petal.Length))+ 
  geom_point() + scale_color_continuous(name="my scale\n")
ggplot(iris, aes(x = Sepal.Length, y = Sepal.Width, col=Petal.Length))+ 
  geom_point() + theme(legend.direction = "horizontal", legend.position = "bottom")

Center-align legend title and legend keys in ggplot2 for long legend titles

By : RPG7000
Date : March 29 2020, 07:55 AM
wish helps you Update Oct. 4, 2019:
A while back I wrote a fairly general function based on the original idea I posted here almost two years ago. The function is on github here but it's not part of any officially published package. It is defined as follows:
code :
align_legend <- function(p, hjust = 0.5)
  # extract legend
  g <- cowplot::plot_to_gtable(p)
  grobs <- g$grobs
  legend_index <- which(sapply(grobs, function(x) x$name) == "guide-box")
  legend <- grobs[[legend_index]]

  # extract guides table
  guides_index <- which(sapply(legend$grobs, function(x) x$name) == "layout")

  # there can be multiple guides within one legend box  
  for (gi in guides_index) {
    guides <- legend$grobs[[gi]]

    # add extra column for spacing
    # guides$width[5] is the extra spacing from the end of the legend text
    # to the end of the legend title. If we instead distribute it by `hjust:(1-hjust)` on
    # both sides, we get an aligned legend
    spacing <- guides$width[5]
    guides <- gtable::gtable_add_cols(guides, hjust*spacing, 1)
    guides$widths[6] <- (1-hjust)*spacing
    title_index <- guides$layout$name == "title"
    guides$layout$l[title_index] <- 2

    # reconstruct guides and write back
    legend$grobs[[gi]] <- guides

  # reconstruct legend and write back
  g$grobs[[legend_index]] <- legend
#> ********************************************************
#> Note: As of version 1.0.0, cowplot does not change the
#>   default ggplot2 theme anymore. To recover the previous
#>   behavior, execute:
#>   theme_set(theme_cowplot())
#> ********************************************************

# single legend
p <- ggplot(iris, aes(Sepal.Width, Sepal.Length, color = Petal.Width)) + geom_point()
ggdraw(align_legend(p)) # centered
ggdraw(align_legend(p, hjust = 1)) # right aligned
# multiple legends
p2 <- ggplot(mtcars, aes(disp, mpg, fill = hp, shape = factor(cyl), size = wt)) + 
   geom_point(color = "white") +
   scale_shape_manual(values = c(23, 24, 21), name = "cylinders") +
   scale_fill_continuous_sequential(palette = "Emrld", name = "power (hp)", breaks = c(100, 200, 300)) +
   xlab("displacement (cu. in.)") +
   ylab("fuel efficiency (mpg)") +
     shape = guide_legend(override.aes = list(size = 4, fill = "#329D84")),
     size = guide_legend(
       override.aes = list(shape = 21, fill = "#329D84"),
       title = "weight (1000 lbs)")
     ) +
   theme_half_open() + background_grid()

# works but maybe not the expected result
# more sensible layout
ggdraw(align_legend(p2 + theme(legend.position = "top", legend.direction = "vertical")))

p <- ggplot(iris, aes(x=Sepal.Length, y=Sepal.Width, color=Petal.Width)) + 
  geom_point(size = 3) +
  scale_color_distiller(palette = "YlGn", type = "seq", direction = -1,
                        name = "Long legend heading\nShould be centered") +
  theme(legend.title.align = 0.5)

# extract legend
g <- ggplotGrob(p)
grobs <- g$grobs
legend_index <- which(sapply(grobs, function(x) x$name) == "guide-box")
legend <- grobs[[legend_index]]

# extract guides table
guides_index <- which(sapply(legend$grobs, function(x) x$name) == "layout")
guides <- legend$grobs[[guides_index]]

# add extra column for spacing
# guides$width[5] is the extra spacing from the end of the legend text
# to the end of the legend title. If we instead distribute it 50:50 on
# both sides, we get a centered legend
guides <- gtable_add_cols(guides, 0.5*guides$width[5], 1)
guides$widths[6] <- guides$widths[2]
title_index <- guides$layout$name == "title"
guides$layout$l[title_index] <- 2

# reconstruct legend and write back
legend$grobs[[guides_index]] <- guides
g$grobs[[legend_index]] <- legend


Not able to disable legend title / enable legend title as required while expoting Highcharts

By : Dima Shechovtzov
Date : March 29 2020, 07:55 AM
like below fixes the issue You can not use JSON.stringify for the functions. You need to post the chart as svg:
code :
$("#download").click(function() {
    var obj = {};

    obj.svg = chart.getSVG(chart.options);


Making only a part of the legend title bold in R

By : Julieta
Date : March 29 2020, 07:55 AM
I hope this helps you . As far as I know, expression doesn't recognize linebreak characters. However, you can use the atop function:
code :

pre_legend_title = expression(atop(bold("PRE-ELECTION HATE CRIME RATES"),
                                   "Average annual hate crimes per 100,000 residents, 2010-15"))

ggplot(mtcars, aes(mpg, wt, fill=factor(cyl))) + 
  geom_point(shape=21) +
  labs(fill = pre_legend_title)
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