With a menu, a tool bar, or the pop up menu of a right click, if a circle is chosen, it will become the circle input mode.
If a circle input is completed, let's change to the input mode or the selection mode of a line.
The input of a circle clicks a left button in the order of the central point, a starting point, and an ending point.
A circle is created in the counterclockwise direction.
Moreover, when you draw a large circle, please place a starting point on the right of the central point.
(It is small without error.)
Since the angle of the ending point of a circle is displayed on a status bar, please make it reference.
If it is operated, pushing Shift key, data of a circle will be created compulsorily.
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The input of a circle
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