toJson method
Implementation
Map<String, dynamic> toJson() {
Map<String, dynamic> map = {};
void addIfPresent(String fieldName, dynamic value) {
if (value != null) {
map[fieldName] = value;
}
}
addIfPresent('fillColor', fillColor);
addIfPresent('fillOpacity', fillOpacity);
addIfPresent('labelColor', labelColor);
addIfPresent('labelSize', labelSize);
addIfPresent('pointSize', pointSize);
addIfPresent('strokeColor', strokeColor);
addIfPresent('strokeWidth', strokeWidth);
return map;
}