Straight Construction Line through Node, Tangent to Curve

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1. Call the Line20x20 Line command.

2. Select a 2D node for the line 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 mouse left or <Enter>.

•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.

Upon selection, the preview of the resulting line will follow the cursor by rotating around the selected node.

3. Select a curve for the line to be tangent to. You can select a construction line (circle, ellipse, 2D path, spline, offset curve, function spline) or a graphic line (circle, circular arc, ellipse, elliptic arc). The configuration of tangency between the selected curve and the resulting line depends on the position of the cursor at the moment of selection: a tangency point will be located as close as possible to the normal projection of the cursor position onto the curve. A curve can be selected in one of the following ways:

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

•Activate one of the following automenu options:

LineCircle

<C>

Select tangent Circle

LineOval

<E>

Select ellipse to create Line

LineSpline

<S>

Select spline

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 mouse left within drawing window for selecting the nearest line.
In addition to splines, the spline selection option allows selecting 2D paths, offset curves and function splines.

Second and third steps can be performed in any order.

10S_LineNodeCurve

Example of creating a line through node tangent to circle

10S_LineNodeCurve2

Example of creating a line based on the same elements with different tangency configuration

 

The relation mark 10S_LineTangentRel located at the tangency point indicates tangency.

After creating a line, the command stays in the mode of creating Line20x20 arbitrarily angled lines and returns to the starting set of automenu options.