I'm glad you want to write a plugin (a.k.a 'effect') for my Screentaker app. You can use this example project as a starting point for your effect.

About

What is an effect? Basically, the effect is something like an image filter in an image processing tool. You get an image - an NSImage instance - and have to return an image. The returned image should have some sort of filter or effect applied to it. What those effects are depends on you. You can add some shadows or a highlight. The default effects Fullscreen and No StatusBar simply crop the status bar or leave the screenshot untouched. The Reflection effect however places a device frame around the screenshot and adds a reflection at the bottom of the image.

FKEarphonesScreenshotEffect is the built-in earphones effect of Screentaker. You can use this as an example on how to include background images and device frames.

Modifications

There are a few things you have to change, though:

• Change the Bundle identifier in Plugin-Info.plist to something unique
• Change the Bundle name in Plugin-Info.plist
• Rename the FKSimpleScreenshotEffect class to something different and unique like ABCoolEffect
• Change the Principal class in Plugin-Info.plist to match your class name like ABCoolEffect

When you've done all this you can start implementing your effect using the FKScreenshotEffect protocol declared in FKScreenchotEffect.h.

Implementation

• You have to make your class conform to the FKScreenshotEffect protocol. You can get more information about the methods in FKScreenchotEffect.h.
• You can also bundle resource files like images of device frames in your effect bundle.
• If you plan to offer options like toggle shadows, you should rather make two effects.

Distribution

Build your product and use the Plugin.screentakerplugin file to distribute your effect to others. I recommend to rename that file to something more unique. You can make me happy by sending your effect to me.

I hope you like Screentaker.
Best regards,
Fabian