Tools for setting up property watcher based pipelines
Demonstrates watchingImagePath() and watchingProperty().
watchingImagePath() detects changes to a String, loads the image the String points to, and returns it as a
ColorBuffer. It allows transforming the loaded image, for instance, by making it grayscale, resizing it,
or applying a filter.
watchingProperty() detects changes to the watched variable which can be of any type. The returned type is not
fixed and is determined by whatever is returned by its function argument. A cleaner argument, if present,
will be executed before calling function, ideal to free resources.
Press the ENTER key to update the state.path variable, which will trigger an update of state.image, followed
by an update to state.redImage.
This program demonstrates how to use watchingProperty() to track changes
to variables.
The method is used to define and keep two variables up to date:
First, it creates a variable x that tracks the horizontal position of the mouse.
Second, it creates the variable xx with the square of x and
keeps it up to date by watching it change.
Note how the variables are defined just once outside the draw loop but are kept up to date nonetheless.
The two variables are used to control the position and the thickness of a horizontal black line.
