The Coordinates window is accessible via the Windows > Show > Coordinates.
- On the left, there are the coordinates (in pixels) of the current pixel indicated by the cursor, with its RGB values.
- On the right, there is a zoom square with a central point.
- If you draw a rectangle, the two empty lines will show its height and width (in pixels).
You will also find the length of the half-axes if you draw an ellipse.