Implement an application to handle canvas scale and things around that (e.g. interpolated line)

[yu-smc]

As-Is

I noticed that we have to call 'interpolator.resizeCanvas' in the component each time when the main canvas scale is changed.
This can easily cause a bug of the gap between main canvas drawing and the interpolation canvas drawing by forgetting to call the function above when the new feature is added.

To-Be

If we can create a new class in the application layer, which manages the main canvas scale, the interpolation canvas scale and so on at one time, the problem above should be avoided.

Note

Be careful with the dependency to each applications: use a certain method (e.g. constructor injection) to keep the application testable.