Easy text adjustments

[jonocarroll]

Text attribute adjustment:

• easy_change_text() which takes a theme element (choices: text, axis.text, axis.text.x, axis.text.y, axis.title, axis.title.x, axis.title.y, legend.text, legend.title, plot.title, plot.subtitle, plot.caption, strip.text, strip.text.x, strip.text.y) and a theme attribute (choices: size, family, face, colour, hjust, vjust, angle, lineheight, color, margin) and a value to set.

Common (?) use-case shortcuts:

• easy_all_text_color()
• easy_all_text_colour()
• easy_text_size()
• easy_all_text_size()
• easy_change_text()
• easy_plot_caption_size()
• easy_plot_legend_size()
• easy_plot_legend_title_size()
• easy_plot_subtitle_size()
• easy_plot_title_size()
• easy_x_axis_labels_size()
• easy_x_axis_title_size()
• easy_y_axis_labels_size()
• easy_y_axis_title_size()

• [x] teach options (not specific to the called function)
• [x] tests
• [x] closes #19
• [x] closes #24
• [x] closes #28

Any other suggestions @bhive01?

[bhive01]

I'm sorry I didn't respond to your initial posting. What I was thinking about on Twitter was when I'm prepping a figure for a presentation and I just want to bump up the base_size so that everything gets bigger together. At least I think that's how it works, every time I try and do it I have to look it up. I think it's base_size that way everything else scales from there. I've looked very briefly here: https://github.com/jonocarroll/ggeasy/blob/feature/text_size/R/text.R and it didn't look like you were using base size, but perhaps you've got it covered with rel or something?

[jonocarroll]

This PR lets you set the size for each component (or all of them) explicitly. It looks like base_size = 11 for most themes. I could add a shortcut to modify base_size if you think there's some relative scaling involved.

[jonocarroll]

For p1 <- ggplot(mtcars, aes(hp, mpg)) + geom_point(),

p1 + theme_grey(base_size = 15)

and

p1 + theme_grey() + easy_change_text(c("text", "title"), "size", 15)

appear to give the same results visually, with some odd scaling happening.

I can work on getting my functions to be more consistent with that output.

[jonocarroll]

It looks like the theme_* functions accept a base_size argument then pass that on to the individual components (with various rel components). That means it doesn't generalise outside of an individual theme. The implementation I have will allow you to specify some or all of the specific sizes.

[codecov[bot]]

Codecov Report

Merging #34 into master will not change coverage. The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #34   +/-   ##
=====================================
  Coverage     100%   100%           
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  Files           5      5           
  Lines         138    179   +41     
=====================================
+ Hits          138    179   +41

Impacted Files	Coverage Δ
R/legend.R	100% <100%> (ø)	:arrow_up:

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[jonocarroll]

Ready to merge but I'll let it steep for a few days. Feel free to comment if you spot anything.

@bhive01 @yonicd