To pull a line away from the snapped orientation simply lift the mouse to end the adjusting session. This allows one to continue to adjust the length of the precisely snapped line element after it is positioned. If a solution is found the line is snapped to the exact tangent point and will remain in this orientation - you cannot "pull it away" from the snap position (as you can with normal vertex snapping). This is a one-shot snapping action, slightly different than normal vertex snapping. Use the "p" key for the perpendicular varient of this snapping. The easiest way to access this snapping technique is to hold down the "t" key while adjusting one end of a line (or other straight-graphic segment). To draw a line from a point tangent to a curve, first position one end of the line at the desired point, then use this snapping technique while adjusting the "other" end of the line. The snapping occurs relative to another graphic which must have a curved segment. Adjusting one end of line is a good example. These snapping actions work with normal vertex (or handle) interactive adjustments of the vertex of a straight segment of a graphic. The "vt" button on the Attributes is the easiest way to turn on Vertex snapping. IMPORTANT: Vertex Snapping must be enabled for use of this tangent and Perpendicular capability. These snapping actions are accessed from the Grid and Guides Menu Both of these interface elements are found near the bottom of the Grid and Guides submenu. This may be easier to remember by those with a math or physics background. The key "n" for the mathematical term "normal" is equivalent to the "p" key.
The snap is activated if a vertex of the straight element is in motion-not when editing the curved element. The key is pressed in conjunction with an on-screen interactive vertex (handle) adjustment. Press and hold the key "t" ( "p" for perpendicular ) to enter the Tangent snap mode. There are a convenient short-cut for these actions. There are two variations of this technique, one snaps the line to the tangent of a curve the other orients the line perpendicular to the curved element. In particular this capability provides an easy way to draw a line tangent to a curve through a defined point. Snapping is provided for straight elements (lines, paths, and polygons) relative to curved elements.
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