rectToString function
Implementation
String rectToString(dynamic rect, { int fractionDigits = 1 }) {
return '(l:${rect.left.toStringAsFixed(fractionDigits)} r:${rect.right.toStringAsFixed(fractionDigits)} '
't:${rect.top.toStringAsFixed(fractionDigits)} b:${rect.bottom.toStringAsFixed(fractionDigits)})';
}