Drainage Thread Vectorization

Three Points Fitting Single Drainage Thread

Manually pick up three points from a single drainage thread and vectorize the drainage thread. The operation steps are as below:

1. Left click to pick up end point of the drainage thread, or right click to end fitting.
2. Left click to pick up another end point of the drainage thread, or right click to get back to step1.
3. Left click to pick up a middle point of the drainage thread, or right click to get back to step2.
4. Finish fitting and repeat former steps.