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The Curve tool draws smooth lines (or splines) that are influenced by control points (or nodes). It uses the B-Spline algorithm to approximate the curve. The curve does not pass through the control points, but as more control points are added to the curve the shape of the curve more closely resembles its definition.

The options described below can be found in the bottom app bar or in the control panel.

The Layer option selects the layer on which new objects are created. Selecting a layer also selects the default color, line type, and line thickness used to draw the object. These properties can be overridden using the Properties tool. Layers are also used to logically group objects within the drawing. Layers can be created, modified, and hidden in the Layer definitions settings panel.
The Edit Last option gives you an opportunity to modify the points used to define the last object created without leaving the current tool. This can be especially useful when using touch input because touch is an inherently imprecise way to locate points. You can use the arrow keys on the keyboard or control panel to fine-tune the location of each point. When you finish editing the object (by deselecting it) you will return to the current tool.
The Done option ends the definition of the current curve and allows you to start a new one.