Construction Ellipse Centered at Node, through Node, Using Axis Length

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1. Call the Ellipse20x20 Ellipse command.

2. Make sure that the following automenu option is active:

CircleCentre

<T>

Select Center Ellipse Node

3. Select a 2D node to be used as the center of the ellipse. A node may be selected in one of the following ways:

•Press mouse left or <Enter>, while the cursor is within drawing window, in order to select a node nearest to the cursor.

•Move the cursor over an intersection of construction lines or a characteristic point of a graphic line, using object snappings, and press mouse left or <Enter>. A connected 2D node will be created automatically at the specified point.

•Activate the following automenu option:

Line3DNode

<N>

Select Node

If the option is activated via keyboard, then the node nearest to cursor gets selected instantly.
If the option is activated via mouse, then you have to additionally press mouse left within drawing window for selecting the nearest node.

4. Select a 2D node for the ellipse to pass through. The first semi-axis of the ellipse will connect this node with the node selected on the previous step. A node may be selected in one the ways described above.

5. Specify the length of ellipse's second semi-axis in one of the following ways:

•Type a length value or a name of a variable via keyboard into the input box of the parameters window. Then press <Enter> or click mouse left anywhere within drawing window for finishing the input.

•Place the cursor at an arbitrary point of drawing window without snapping to existing elements and then press mouse left or <Enter>. The length of ellipse's second semi-axis will be calculated so, that it ensures passing of the ellipse through such point.

Regardless of the way of definition, length of the second semi-axis is saved in ellipse parameters and can be edited later.

During second semi-axis length definition, the preview of the ellipse follows the cursor within the area limited by the length of the first semi-axis. When the cursor is outside this area, the preview is not displayed and arbitrary point cannot be specified.

10S_EllipseCenterNodeLength 10_EllipseLength

After creating an ellipse the command returns to the initial state.