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What is brush engine

TODO

How to write brush engine

TODO

Presets

Backward compatibility, version is another property, look at kis_pressure_rate_option.cpp : settings->setProperty("MyAttributeVersion","3.14")

FAQ

What happens if I implement both PaintAt and PaintLine in a paintop?

If you implement paintLine, paintAt will not be called. If you look at KisPaintOp, you can see that paintAt() is called in paintLine() method.

What should I use to debug my code? printf? clog? qDebug()?

Be wise and look at kis_debug.h, there you find some defined named outputs. You can use it like (similary to qDebug(), cout()): dbgPlugins() << "Hello" << QRect() << KisPaintInformation;

You can turn on and off the areas of debugging (plugins ,ui, core, ...) with kdebugdialog utility in KDE