SpriteFontTextElement constructor
      
      SpriteFontTextElement({ 
    
    
- required Image source,
- required Float32List transforms,
- required Float32List rects,
- required Paint paint,
- required LineMetrics metrics,
Implementation
SpriteFontTextElement({
  required this.source,
  required this.transforms,
  required this.rects,
  required this.paint,
  required LineMetrics metrics,
}) : _box = metrics;