>UPDATE: I rejiggered the function to actually now, y’know, do what it says it should do :-)<\/p>\n
A friend, we’ll call him _Alen_ put a call out for some function that could take an image and produce a per-row “histogram” along the edge for the number of filled-in points. That requirement eventually scope-creeped to wanting “histograms” on both the edge and bottom. In, essence there was a desire to be able to compare the number of pixels in each row\/line to each other.<\/p>\n
Now, you’re all like _”Well, you used ggplot to make the image so\u2026”_ Yeah, not so much. They had done some basic charting in D3. And, it turns out, that it would be handy to compare the data between different images since they had different sets of data they were charting in the same place. <\/p>\n
I can’t show you their images as they are part of super seekrit research which will eventually solve world hunger and land a family on Mars. But, I _can_ do a minor re-creation. I made a really simple D3 page that draws random lines in a specified color. Like this:<\/p>\n