The line become blur when drawing line
I got a problem when I draw a line. The line will become blur just like the image below. It will not appear everytime but it easy to reproduce when drawing a line which is not horizontal or vertical. Anyone faced this issue and have a fix on it ? 

![Screenshot 2019-04-02 at 12 09 03 PM](https://user-images.githubusercontent.com/15829696/55375824-2cd5fc80-5540-11e9-98a5-d914ccef92a4.png)
