rbokeh: Color gradient plot/legend

Community Support
1

Hi,

rbokeh question.

I implemented a heatmap with ly_crect, but now I need to make a legend.

The legend is going to take the form of something like the color gradient:

The question is:

  • what basic rbokeh layer do you recommend to do this sort of color gradient?

  • Is there any positioning tricks to get a small figure offset from a larger one?

Because the “legend” with “heatmap” is intended to go together in a Trelliscope display, I have to somehow get the two to be in one rbokeh figure.

Thanks,

Jeremiah

2

This is just kind of the R version of this question:
https://groups.google.com/a/continuum.io/forum/#!topic/bokeh/N_wiRxF0e1I

···

On Thursday, January 21, 2016 at 3:12:25 PM UTC-8, jeremiah rounds wrote:

Hi,

rbokeh question.

I implemented a heatmap with ly_crect, but now I need to make a legend.

The legend is going to take the form of something like the color gradient:

http://www.r-bloggers.com/r-user-group-recap-heatmaps-and-using-the-caret-package/

The question is:

  • what basic rbokeh layer do you recommend to do this sort of color gradient?
  • Is there any positioning tricks to get a small figure offset from a larger one?

Because the “legend” with “heatmap” is intended to go together in a Trelliscope display, I have to somehow get the two to be in one rbokeh figure.

Thanks,

Jeremiah

3

I ended up going with ly_crect:

legend_data = list(legend_values = c(-0.545923348, -0.319339005,

-0.092754662, 0.133829681, 0.360414024, 0.586998367, 0.81358271,

1.040167053, 1.266751396, 1.493335739), width = c(0.22658,

0.22658, 0.22658, 0.22658, 0.22658, 0.22658, 0.22658, 0.22658,

0.22658, 0.22658), legend_colors = c(1L, 2L, 3L, 10L, 9L,

8L, 7L, 6L, 5L, 4L), y = c(1, 1, 1, 1, 1, 1, 1, 1, 1, 1))

legend = figure(height=150, tools=NULL, xlab=“Legend”, ygrid=FALSE, xgrid=FALSE,xaxes=TRUE, yaxes=FALSE , xlim=r) %>% ly_crect(x=legend_values,y=y, data=legend_data,color=legend_colors,width=width, line_alpha=0,fill_alpha=fill_alpha)

···

On Thursday, January 21, 2016 at 3:12:25 PM UTC-8, jeremiah rounds wrote:

Hi,

rbokeh question.

I implemented a heatmap with ly_crect, but now I need to make a legend.

The legend is going to take the form of something like the color gradient:

http://www.r-bloggers.com/r-user-group-recap-heatmaps-and-using-the-caret-package/

The question is:

  • what basic rbokeh layer do you recommend to do this sort of color gradient?
  • Is there any positioning tricks to get a small figure offset from a larger one?

Because the “legend” with “heatmap” is intended to go together in a Trelliscope display, I have to somehow get the two to be in one rbokeh figure.

Thanks,

Jeremiah

4

Just piling on to my thread rather than start a new one =)

Step 2 of this gradient legend was to use grid_plot to lay it out. I noticed that grid_plot over-wrote my titles with the names of the list argument, but it does so with a font that is not very strong (either it is gray or has a light line-width). Is there any way to get “Figure 1” and “Figure 2” to be bolder in the snippet below? They are surrogates for “Legend” and “Plot Title”.

data(iris)

p1 = figure() %>% ly_points(iris$Sepal.Width, iris$Sepal.Length)

p2 = figure() %>% ly_points(iris$Sepal.Length, iris$Sepal.Width)

plots = list()

plots[[“Figure 1”]] = p1

plots[[“Figure 2”]] = p2

grid_plot(plots, nrow=2, ncol=1)

···

On Thursday, January 21, 2016 at 3:12:25 PM UTC-8, jeremiah rounds wrote:

Hi,

rbokeh question.

I implemented a heatmap with ly_crect, but now I need to make a legend.

The legend is going to take the form of something like the color gradient:

http://www.r-bloggers.com/r-user-group-recap-heatmaps-and-using-the-caret-package/

The question is:

  • what basic rbokeh layer do you recommend to do this sort of color gradient?
  • Is there any positioning tricks to get a small figure offset from a larger one?

Because the “legend” with “heatmap” is intended to go together in a Trelliscope display, I have to somehow get the two to be in one rbokeh figure.

Thanks,

Jeremiah

5

Hi Jeremiah,

I'm afraid I have zero clue about R. It's amazing how I don't recognize
anything you've written as Bokeh!

Anyway, just a stab in the dark, most text things have a property
`text_font_style` that you can set to `bold` if you haven't seen that.
This may be useless. Apologies if that's the case.

I'd love to see the full code and a screenshot when you're done so I can
get more of a flavor of how to execute this in R.

Sincerely,

Sarah Bird

···

On 1/21/16 4:04 PM, jeremiah rounds wrote:

Just piling on to my thread rather than start a new one =)

Step 2 of this gradient legend was to use grid_plot to lay it out. I
noticed that grid_plot over-wrote my titles with the names of the list
argument, but it does so with a font that is not very strong (either it
is gray or has a light line-width). Is there any way to get "Figure 1"
and "Figure 2" to be bolder in the snippet below? They are surrogates
for "Legend" and "Plot Title".

data(iris)
p1 = figure() %>% ly_points(iris$Sepal.Width, iris$Sepal.Length)
p2 = figure() %>% ly_points(iris$Sepal.Length, iris$Sepal.Width)
plots = list()
plots[["Figure 1"]] = p1
plots[["Figure 2"]] = p2
grid_plot(plots, nrow=2, ncol=1)

On Thursday, January 21, 2016 at 3:12:25 PM UTC-8, jeremiah rounds wrote:

    Hi,

    rbokeh question.

    I implemented a heatmap with ly_crect, but now I need to make a legend.

    The legend is going to take the form of something like the color
    gradient:
    R User Group Recap: Heatmaps and Using the caret Package | R-bloggers
    <GTA R Users Group – Using R for Data Mining Competitions | R-bloggers;

    The question is:
    - what basic rbokeh layer do you recommend to do this sort of color
    gradient?
    - Is there any positioning tricks to get a small figure offset from
    a larger one?

    Because the "legend" with "heatmap" is intended to go together in a
    Trelliscope display, I have to somehow get the two to be in one
    rbokeh figure.

    Thanks,
    Jeremiah

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6

Hi,

I’m interested in the answer as well.

Can Bokeh heatmaps now support gradient legend?

Further, can each cell be annotated with the numeric value?

Like the following, taken from http://stanford.edu/~mwaskom/software/seaborn/generated/seaborn.heatmap.html#seaborn.heatmap

../_images/seaborn-heatmap-5.png

Thanks

···

On Thursday, January 21, 2016 at 6:12:25 PM UTC-5, jeremiah rounds wrote:

Hi,

rbokeh question.

I implemented a heatmap with ly_crect, but now I need to make a legend.

The legend is going to take the form of something like the color gradient:

http://www.r-bloggers.com/r-user-group-recap-heatmaps-and-using-the-caret-package/

The question is:

  • what basic rbokeh layer do you recommend to do this sort of color gradient?