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  • Tammy LaBiche-Henley thinks this is interesting:

As part of our discussion on alignment, let’s spend a bit of time on diagonal components. In the previous example, the original version (Figure 3.13) had diagonal lines connecting the takeaways to the data and diagonally oriented x-axis labels; the former were removed and the latter changed to horizontal orientation in the makeover (Figure 3.14). Generally, diagonal elements such as lines and text should be avoided. They look messy and, in the case of text, are harder to read than their horizontal counterparts. When it comes to the orientation of text, one study (Wigdor & Balakrishnan, 2005) found that the reading of rot...

From

Cover of Storytelling with Data: A Data Visualization Guide for Business Professionals

Note

Avoid diagonal lines and rotated text - takes longer to read and is distracting