@clarkperkins Could you add a factory method for this class to fit common iOS conventions?

```objc
+ (instancetype)floorPlanImageWithSizeX:(NSInteger)sizeX sizeY:(NSInteger)sizeY topLeft:(CLLocationCoordinate2D)topLeft topRight:(CLLocationCoordinate2D)topRight andBottomLeft:(CLLocationCoordinate2D)bottomLeft;
```