How to save a graphic created by CorePlot to a jpg file

Question

I am using CorePlot to draw different graphs in my application. Then, I would like to save this graph to a jpg file and publish to some social networking site (e.g., Twitter).

Answer 1

Actually, the CPLayer base class used for all drawing elements in Core Plot has a category method called -imageOfLayer that returns a UIImage instance of whatever layer you call it on. See the CPPlatformSpecificCategories.h and CPPlatformSpecificCategories.m files in the framework if you want to see how this is accomplished.

Simply use -imageOfLayer on your CPGraph instance and then use UIImageJPEGRepresentation() to create the JPEG version of that image. You can then upload that image using the normal means.

Likewise, there is a -dataForPDFRepresentationOfLayer method that returns an NSData instance containing a PDF representation of the layer and its sublayers.