Building plug-ins in Oracle APEX is not that difficult. This application will take you by the hand and show you step by step how to build an APEX plug-in.
The problem:
Oracle APEX has very fancy charts, but you want to have a chart that you can download as an image. This problem will be solved once without a plug-in and then with a plug-in. The individual plug-ins have different levels of implementation. Have a look at the code and understand how easy it is to build a plug-in.
The App can be found on https://apex.oracle.com/pls/apex/f?p=138463
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Important clarification: My work in the development team of Oracle APEX is in no way related to my open source projects or the plug-ins on apex.world! All plug-ins are built in my spare time and are not supported by Oracle!