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As you move the cursor around to enter an end point for a profile segment, other dotted lines appear. These lines show where the current cursor position is in relation to other entities. You can select other entities to snap to by entity digitising them (using the right hand mouse button).
When the cursor gets close to one of these locations it sticks slightly or snaps to that location. The new profile segment also changes colour.
From the Profile Tool dialog box, select Snap to display this dialog box:
Mark one or more of the check boxes in the Snap dialog box to select a particular type of snap. Click on the All button to mark all the boxes, or on the None button to clear all the boxes.
Vertical A snap is made to any position sharing the same X co-ordinate as a selected entity.
Horizontal A snap is made to any position sharing the same Y co-ordinate as a selected entity.
Blend Arcs A snap is made to any position where an arc intersects another entity. You can then choose which parts of the entities you want to keep.
Perpendicular to Line A snap is made to any position perpendicular to a selected line entity.
Tangential to Arc A snap is made to any position tangential to a selected arc entity.
Radially from Arc A snap is made to any position radial to a selected arc entity.
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