In addition to Crosshair Cursor performance improvements mentioned in our recent post about performance improvements, we extended the Crosshair functionality on the basis of some very popular customer requests. The improvements apply to Chart Controls for WinForms and WPF, as well as ASP.NET WebForms and MVC, in our upcoming release v18.1.
New Crosshair Line mode: Free
We introduced a new Crosshair Cursor mode where snapping is disabled and lines are shown directly at the current mouse pointer position:
To enable this feature, set the property ChartControl.CrosshairOptions.LineMode to Free.
Note that the property CrosshairOptions.SnapMode (link for WinForms and ASP.NET, link for WPF) is still used in this mode to determine which values are selected for inclusion in the crosshair output.
Crosshair Details in the legend
In certain situations it can be convenient to display Crosshair Cursor information in the Legend panel instead of the standard “tooltip” popup window. This image shows a legend filled with Crosshair detail for the year 2016:
Use the property ChartControl.CrosshairOptions.ContentShowMode to move the Crosshair Cursor data to the legend. Note that it is also possible to customize this option for an individual series using the Series.CrosshairContentShowMode property.
Include extra field values in Crosshair information
The final new feature is perhaps the best of the lot: you can now display arbitrary extra data source field values in the Crosshair output using the pattern syntax (link for WinForms and ASP.NET, link for WPF).
For example, the following text pattern includes the value of a field called Discount in the Crosshair output: {S}: {V:F2} (Discount: {Discount:P0}). The newly extended pattern syntax interprets the part {Discount:P0} as an instruction to include an extra field value.
