Add scalebar to the graph

[Greerlab]

Hi, thank you for providing the opportunity to explore the mouse brain ISH atlas with coding!

I am wondering whether there is a way to add the scale bar into the graph?

Thanks!

[oganm]

Just added a rudimentary function to add a scale bar. The information you need is available through getSectionImage and getAtlasImage which include the resolution information in pixels for the images. This can then be fed to add_scale to add a scale bar

downsample = 2

image_res = getSectionImage(69177654)$resolution

downloadImage(imageID = 69177654, 
             view = 'projection',
             downsample = downsample) %>% 
    add_scale(image_res,downsample)

Also works for cropped images

downloadImage(imageID = 69177654, 
             view = 'projection',
             downsample = downsample)  %>% 
    centerImage(x = 6382,
            y= 2744,
            xProportions = c(.1,.1),
            yProportions =c(.1,.1),
            downsample = downsample) %>% 
    add_scale(image_res,downsample)

[Greerlab]

Thank you for the quick response, somehow I got an error from add_scale

Error in magick::image_read(system.file("black.png", package = "allenBrain")) : path must be URL, filename or raw vector

[oganm]

Just forgot to push the all important black pixel. Should be fine now

[oganm]

• a parameter to draw a scalebar for x microns
• Gravity options shouldn't be essential since all margins are in ratios instead of pixels.
• Transparency to the scalebar background
• End and breaklines for the bar