The label chart will display negative values if they are passed in the data. I've not changed the settings for the y axis and it scales the graph (adding negative Y as needed) to show data that it needs to display. The screen shots below show the same graph with varing quantities for the items displayed.
Hello and thanks!
Strange. Can it be because I had only 0 and negative values when I tested? When tested today where I have some positive values, I get the same correct behavior as you. I did a new test with only 0 and negative, and I get the following result:
As you can see it draws from the lowest value and up:-)
And here the same chart with some positive values and some negative...
looks like a bug to me!
If you have a good idea of the possible max and min values you can 'fix' the issue by turning off Auto scaling on the y-axis and then putting in the max and min values (looks like these can also be driven by data bindings so you could write a service to give you max and minimum)
If you did write such a service you would want your maximum to be >= 1 otherwise the bars would rise from the bottom still.