public Builder SetEnd(global::lth.line_sensor.Point value)
 {
     pb::ThrowHelper.ThrowIfNull(value, "value");
     PrepareBuilder();
     result.hasEnd = true;
     result.end_   = value;
     return(this);
 }
 public Builder MergeEnd(global::lth.line_sensor.Point value)
 {
     pb::ThrowHelper.ThrowIfNull(value, "value");
     PrepareBuilder();
     if (result.hasEnd &&
         result.end_ != global::lth.line_sensor.Point.DefaultInstance)
     {
         result.end_ = global::lth.line_sensor.Point.CreateBuilder(result.end_).MergeFrom(value).BuildPartial();
     }
     else
     {
         result.end_ = value;
     }
     result.hasEnd = true;
     return(this);
 }