1.9 preview.

Author: kirsan31

Directory.Build.props

@@ -12,6 +12,9 @@
 		<MinorPatchVer>9.0</MinorPatchVer>
 		<PRVer>-pr</PRVer>
 		<NugetReleaseNotes>
+        Many additions and fixes in HitTest for lines and points charts both in 2D and mainly in 3D modes.
+        Optimizations and bugs fixes.
+        More info: https://github.com/kirsan31/winforms-datavisualization/releases/tag/1.9pr
 		</NugetReleaseNotes>
 	</PropertyGroup>
 </Project>

Docs/BreakingChanges.md

@@ -0,0 +1,15 @@
+## Most notable breaking changes
+
+- `SqlCommand`, `SqlDataAdapter` can't be used as chart's `DataSource` anymore.
+- **Since 1.8 preview:**  
+  If you use Axes auto min / max values and call `DataPointCollection.Clear()` method for already empty collection:
+    - Old behavior - axes min / max values will be recalculated on next chart paint.
+    - New behavior - axes min / max values will not be recalculated.  
+- **Since 1.9 preview:**  
+  The algorithm for determining indexed series has been changed. Previously, a series was considered indexed if the `IsXValueIndexed` flag was set or if all its data points had an X-axis value equal to 0.
+  To draw a vertical line at an X-axis value of 0, you had to set a custom flag, `IsXAxisQuantitative`.  
+  Now, a series is considered indexed only if the `IsXValueIndexed` flag is set. The custom flag, `IsXAxisQuantitative`, has been removed.
+
+    Recommended actions:
+    - If your indexed series were defined solely by having all their X-axis values equal to zero, you need to set the `IsXValueIndexed` flag for these series.
+    - If you were using the `IsXAxisQuantitative` flag, you should remove it.

NuGetReadme.md

@@ -9,7 +9,7 @@ This control is a [.NET](https://dotnet.microsoft.com/) continuation of [.NET Fr
 - New 3D mode for emulating Z axis.
 - New API elements.
 - This Nuget package.  
-- Small bugs fixes.
+- Bugs fixes and other improvements.
 
 ### Main differences from available free .NET WinForms chart controls.
 

README.md

@@ -12,7 +12,8 @@ This repository is a [.NET](https://dotnet.microsoft.com/) continuation of [.NET
 - New [3D mode](Docs/ZDepthRealCalc/ZDepthRealCalc.md) for emulating Z axis.
 - [New API elements](Docs/NewAPI.md).
 - [Nuget package](https://www.nuget.org/packages/WinForms.DataVisualization/).  
-- Small bugs fixes.
+- Bugs fixes and other improvements.
+- [**Breaking changes.**](Docs/BreakingChanges.md)
 
 ### Main differences from available free .NET WinForms chart controls