MeasureTool causes link errors

[bclay1297]

Trying to use MeasureTool class From my old app causes link errors from osgEarth::Util::Controls. That class has been deprecated and I do not see ControlCanvaas moved to another section. MeasureTool is still in osgEarth but I do not see a way / example on how to draw the line to be measured on the earth as we could with the previous code. Is there a way to do that without building in the deprecated code?

[gwaldron]

osgEarth CMake no longer builds the Controls library by default, but you can enable it with a CMake flag. We do not plan on removing it so feel free to continue using it. It won't get any further updates though.

If you don't want to use it, you can run osgearth_imgui and open the Terrain tool, you will see a Measure feature. The code for this is in the header file TerrainGUI in the osgEarthImGui nodekit. Feel free to examine this and re-use the code as you see fit. Hope this helps!