It would be nice to be able to specify the maximum width of a plot as well as the height. The width is determined by both the data given and the y axis (which depends on the format string used). Though this could be handled externally, by only passing in the appropriate amount of data, I think it might be nice to do this internally so that users don't have to factor in the offset + axis when determining how much data to pass in. I think the simplest approach would be to just keep the last n data points where n is the largest number such that the plot isn't too wide. One could also think of trying to plot every kth point where k is as small as possible such that the plot isn't too wide, but that's more complicated, so I wouldn't bother unless somebody cares enough to submit a PR for it. I can go ahead and do a PR for this in Python if you're interested.