Overview of the Polyline labeling tool in Ango Hub

The polyline labeling tool allows you to draw a line on an image.

The Polygon Labeling Tool in Ango Hub

How to add a Polyline tool to your project

From the project’s Settings tab, enter the Label Set section.

Click on Add Category. From the list that appears, click on Polygon.

A new row will appear named Polyline. Click on it to expand it.

Give your polyline tool a title and description.

Enable the Required toggle if you want to force labelers to create a polyline on every asset. When the toggle is disabled, labelers will be able to save and move to the next asset without creating a polyline label using this class.

If you would like to ask labelers further questions, for example, if you want to show a further radio after drawing the polyline, click on Add Classification and add a further question. More on nested questions here.

How to Draw a Polyline

Click on the image where you’d like the first point of the polyline to be. Click again where you’d like the second point to be, and so on. When you are done, click on the first point again or press on N on your keyboard to close the polygon.

While drawing, you may click anywhere with the right mouse button to delete the last point you have placed.

To edit a polyline's points, select it by clicking on it, then drag the polyline itself or one of its points.

Edge Sharing

While drawing a polyline, if you press E, Hub will highlight the points of other polygons, polylines, and points. By clicking on the other object's points, you can snap your current polyline's points to them:

By snapping at least two points to the existing polygon and holding Alt (⌥ on macOS) + clicking, you can quickly anchor a series of points to the existing object, as shown in the GIF above.

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