Click on a path segment with the Convert-to-Arc tool to create a smooth arc from that segment. The arc will use the existing anchor points, converting corner anchor points to smooth points.
TIP: Shift-click on a path segment to create the inverse of the arc.
The radius of the arc will be determined by the direction lines of the anchor points. If the direction lines at either end of the path segment angle toward each other, a convex arc is created. If the direction lines angle away from each other, a concave arc is created. If the direction lines are parallel, the Convert-to-Arc tool cannot be used.
For example, clicking the tool on one side of a rectangle or square would not produce an arc because Xtream Path 2 would have no way to calculate a smooth arc between the parallel sides of the object.
When the Option key (Mac) or Alt key (Windows) is pressed, the Convert-to-Arc tool functions like the Add Anchor Point tool (when over a path segment) or the Delete Anchor Point tool (when over an existing anchor point).
Example1:
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Example2: