We have released version 3.5 of MindFusion.Charting for WinForms. The new version includes:

Edit pie charts interactively
Pies in 2D and 3D pie charts can now be resized with the mouse. Set AllowEdit to true to let users change the values of each two adjacent pie pieces by dragging their common border with the mouse. The HitTestAngleOffset property sets the deviation, in degrees, at which the user can click around the pieces border and the click would still be considered as a click on the border.

Support for Undefined Data Values
You can now use null (undefined) values in your data for all charts. There are several options how the control handles the null values - see the HandleEmptyValue property and the HandleEmptyValue enumeration.

ToolTips
Now all chart types support tool tips. Area charts in particular can show a different tooltip for every region between two adjacent data points.

Themes
Chart themes are now represented as XML files that can be saved and loaded with SaveTheme and LoadTheme. There is a theme editor tool available that facilitates saving, editing and opening of chart themes. The control also provides an initial set of 8 predefined themes.

Major/Minor Axis Ticks
You can divide the scale of any chart axis more precisely with the new MajorTickLength and MinorTickLength properties. Set them to a value greater than 0 and the control draws ticks not only at the scale intervals but also among them. The number of minor axis ticks in each interval is set with MinorTicksPerInterval. The ticks are drawn with MajorTickPen and MinorTickPen.

Improved Hit Testing
~ a bug is fixed that gave false results by hit testing in 3D cylinders
~ SecondDataIndex in the Line element gives you the index of the data next to the point where the user has clicked. The new property, together with DataIndex lets you know the region of an area chart where the user has clicked.
~DataIndex and SeriesIndex properties are supported for all chart types - you can learn the index of the series and the index in the series of the element that was clicked.

API Changes
~ The DivMarkerAlignment property is replaced by TickAlignment
~ DivMarkerLength is replaced by MajorTickLength

Registered customers with an active upgrade subscription can download the licensed version from the clients area on our site.

A trial version is available for download here:
https://www.mindfusion.eu/ChartWinFormsTrial.zip

Enjoy!