The Curve mark enables the end user to use spline curve drawings. The curve is specified by an array of points and tension parameter that affects the degree of the curve's bend. The curve passes smoothly through each point in a given set of points. With this mark, end users can create spline curves with different colors, opacities, widths, and styles (solid, dash, dot, etc.).

Edit Mode

In Edit Mode, end users can create, select, move, resize, delete, and change attributes of the mark.

• To create the mark:

1. Click where you want the curve to start.
2. Drag to the location of a vertex and click.
3. Drag and click to create each additional vertex.
4. Double-click the location where the curve ends.

• To select the mark:

1. Place mouse cursor over any part of the curve.
2. Click to select the curve.

• To resize the mark:

1. Select the curve.
2. Place mouse cursor over control point and click.
3. Drag the point to another location.

• To move the mark:

1. Select the curve.
2. Place mouse cursor over any part of the curve and click.
3. Drag the curve to another location.

• To change curve attributes:

1. Select the curve.
2. Right-click the curve to display the context menu and choose Properties.
3. Change the attributes of the Curve and close the dialog.