/ ciao4.16 / faq / polygons.html

How do I build polygon regions in ds9?

Select "polygon" from the "Region → Shape" menu.
Click and drag to draw a box on the image.
Select the box and double squares will appear at the corners.
The outer set of corner squares indicate that the standard region functions are active:
- Delete region: use <DELETE> key
- Move region: use left mouse button (symbol: cross)
- Resize region: use left mouse button (symbol: box + arrows)
The inner set of corner squares allow you to add vertices to the shape:
- Place cursor on any line segment at desired vertex location
- Click left mouse button to create the vertex
- Move vertex with left mouse button (symbol: box within box)

/ ciao4.16 / faq / polygons.html