copyFrom method
Implementation
void copyFrom(OrbFrame other) {
final needed = other._length * stride;
if (_data.length < needed) {
_data = Float64List(needed);
}
_data.setRange(0, needed, other._data);
_length = other._length;
_sortedLength = -1;
_lineCount = 0;
_appendLines(other, 1);
}