doubleLine static method
Implementation
static List<Op> doubleLine(
double x1, double y1, double x2, double y2, DrawConfig config) {
final List<Op> o1 = _line(x1, y1, x2, y2, config, true, false);
final List<Op> o2 = _line(x1, y1, x2, y2, config, true, true);
return o1 + o2;
}