Create Cornu Track

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# 2.1.2.6 Create Cornu Track

  `Left-Click` to place each endpoint on an open track end or just on the layout. During the move to the click, if MagneticSnap (Section 2.12.1) is enabled, an anchor will show when the cursor is near an open end point. This can be inhibited with Alt. If MagneticSnap is disabled this will only happen if Alt is held. If Magnetic Snap does not find a end, if SnapGrid is enabled, the end will snap to the nearest grid point unless Alt is held.

`Left-Drag` if the endpoint not on an existing track drags out the end angle of the new track. This is shown by the Cornu endanchor.

The anchor is only drawn for Cornu ends that are not joined to existing tracks and it shows the position, direction and radius of the track, and has anchors for altering these properties. When the Cornu is joined to a track, it uses the properties of the end of that track instead. Anchor point handles are drawn outside the end of the Cornu track to allow track-pins to be edited on the track itself. `Left-Click` to place the second Endpoint either on a track endpoint or not. `Left-Drag` sets the second end angle like the first for unconnected end-points.

Complete the Curve by pressing `Enter`, or Reject it with `Esc`.

The radius and angle of the selected open Cornu end can also be set with text entry boxes in the Status Bar.

When either endpoint is being moved it will "Snap" to an open track endpoint of the tracks underneath the cursor unless `Shift` is held. You can then only move the endpoint along that track if it is splitable, or in an extension of it. After the new track is completed, it will be connected to these existing tracks.

Cornu Track Pins are further explained in Section 2.2.7.4 - they constrain the Cornu curve to smoothly pass through thier position as well as satisfying the end conditions. You can place them by clicking on the Cornu and select, Drag to move them around or hit Delete to remove them.

If the end is not connected, an anchor will enable the end-angle and radius to be set by dragging. Initially the end radius is set to be zero and the angle will be picked to create a smooth curve given the end angle. Altering the end angle with the anchor resets the radius to zero.