Fast property naming, by hand.

README.md

Try to rename these properties, right in this kind of fashion:

this._x = this.x;  =>  this.x = this._x;
this._y = this.y;  =>  this.y = this._y;
this._w = this.w;  =>  this.w = this._w;
this._h = this.h;  =>  this.h = this._h;

Read and sort horizontal, as usually.

→ this._x = this.x;
→ this._y = this.y;
→ this._w = this.w;
→ this._h = this.h;

Read and sort vertical, as a chinese.

      ↓        ↓
this._x = this.x;
this._y = this.y;
this._w = this.w;
this._h = this.h;