---
title: "Manual drawing"
linkTitle: "Manual drawing"
weight: 1
---
It is used for semantic / instance segmentation.

Before starting, you need to select `Polygon` on the controls sidebar and choose the correct Label.

![](/images/image084.jpg)

- Click `Shape` to enter drawing mode.
  There are two ways to draw a polygon: either create points by clicking or
  by dragging the mouse on the screen while holding `Shift`.

| Clicking points                | Holding Shift+Dragging         |
| ------------------------------ | ------------------------------ |
| ![](/images/gif005_detrac.gif) | ![](/images/gif006_detrac.gif) |

- When `Shift` isn't pressed, you can zoom in/out (when scrolling the mouse
  wheel) and move (when clicking the mouse wheel and moving the mouse), you can also
  delete the previous point by right-clicking on it.
- You can use the `Selected opacity` slider in the `Objects sidebar` to change the opacity of the polygon.
  You can read more in the [Objects sidebar](/docs/manual/basics/objects-sidebar/#appearance) section.
- Press `N` again or click the `Done` button on the top panel for completing the shape.
- After creating the polygon, you can move the points or delete them by right-clicking and selecting `Delete point`
  or clicking with pressed `Alt` key in the context menu.
