NextCharts has now support for bar charts with negative values. A new chart type called nbar was introduced. From NextReports 8.2 version this feature will be part of designer and server.
A simple bar chart with negative and positive values will show all values over X axis if chart type is bar:
If we just change the type from bar to nbar, X axis will be considered at 0, so positive values will be shown over it and negative values will be shown under it:
In case all values for nbar are positive, then it will be no difference between bar with startingFromZero=true and a nbar chart.
In case all values for nbar are negative, then the chart will have all its values under X axis:
nbar chart can support as styles glass (as above) or normal: