Construction Circle with Two Tangents, through Node

This circle creation method is similar to the "Through node, with two tangents", but has different order of elements selection, which allows snapping of a tangency configuration to a node.

1. Call the Circle command.

2. Select a first line for the circle to be tangent to. You can select a construction line (straight or circle) or a graphic line (straight, circle or circular arc). A line can be selected in one of the following ways:

•Move the cursor over the desired line, using object snappings, and press or <Enter>. In case of selecting a graphic line, a coinciding construction lines (straight or circle) is created automatically, and the current circle is based on such construction line.

•Activate one of the following automenu options:

If the option is activated via keyboard, then the construction line of the corresponding type nearest to cursor gets selected instantly.
If the option is activated via mouse, then you have to additionally press within drawing window for selecting the nearest line.

3. Select a second line for the circle to be tangent to. Selection is available for lines of the same types as in the previous step. A line can be selected in one of the ways described above.

When selecting a 2D path, that have angles, passing of the circle through a vertex of one of the angles can be interpreted as a tangency.

4. Set the desired tangency configuration, if necessary. Use the following automenu option for switching between possible tangency configurations:

Tangency configurations are also switched automatically, when moving the mouse, depending on which configuration allows the circle to pass closer to the cursor.

5. Snap tangency configuration to a node, if necessary.

6. Select a 2D node for the circle to pass through. A node may be selected in one of the following ways:

•Move the cursor over the desired node, using object snappings, and press or <Enter>.

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

•Activate the following automenu option:

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 within drawing window for selecting the nearest node.

After creating a circle the command returns to the initial state.