hunkim98
commented
1 year ago An opensource repository for pixel drawing named "piskel" also seems to use a strategy pattern for managing tools. Its applyToolAt method is overriden in other methods that implement BaseTool
Currently, when user changes the brush mode, different logic is called based on the brush mode when a user interacts with the canvas. This style can be cumbersome to manage when we have various drawing mechanisms.
For ease of creating other brush modes, @lerrybe has suggested that we could use a strategy pattern for changing brush modes.
A strategy pattern is a pattern where the context(In Dotting, it is class
Canvas) does not need to know the specifics of a specific algorithm but instead chages its strategy(i.e. strategy) and simply calls on of the method inside the strategy. More InformationTo implement this, one should create a generic interface for all brush strategy, and create classes for each brush mode based on the interface.
After the appropriate classes are created, one could create a new variable named brushWorker(or any name you would like) inside the
Canvasclass and change the brushWorker instance to another instance whenever a user changes the brush mode.For your information, I leave you some useful links you could reference when you implement this
[Changing brush mode by changing the tool to another tool instance]
[A generic interface for all tools and the list of the tools]