is there a key you can tell gimp to draw a circle that begins in the middle and grows when you move your mouse away from the middle ?
Yes. Push and hold CTRL while moving the mouse. You can also push SHIFT to make perfect circles instead of ellipses.
Note that you have to push CTRL and/or SHIFT after you push the mouse button down, not before. Using the modifier keys before that changes what happens to the selection in relation to an already existing selection: CTRL subtracst the new selection from the old one, SHIFT adds them together, both CTRL and SHIFT take the intersection.
Does there exist a perfect circle script with 2 coordinations, the middle of the circle and the radiate of the circle
I don't know about such a script.
-- "Codito ergo sum" Roel Schroeven
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