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Lituus Spiral

According to Robert C. Yates 1952, the Lituus curve is studied by Roger Cotes in 1722.  It is named after an ancient Roman trumpet called lituus.  The curve is asymptotic to the positive x-axis, and the other end spiral in towards the pole.  As theta approaches infinity, the curve approaches the origin.

To draw a Lituus spiral, select the object from the Chart Objects Pane and drop it on to an open chart.

LituusSpiral

There are appearance aspects of this object that can be changed in the Properties Pane.

Color  Changes the color of the object.

Smoothing Mode  Sets the drawing type of this object.  Default draws a normal line.  Anti-alias draws a smoother line at the expense of drawing performance.

Width  This sets the size of the pen used to draw the outline of this object.  A larger number indicates a thicker line.

Transparency  The level of transparency given to this object.  Valid numbers are 0-255, where 0 is invisible or completely transparent and 255 indicates no transparency.

Sweep Angle  Sets the angle of the end point of this spiral.  A sweep angle of 360, for example, will indicate that the spiral will complete one revolution.

See Also

Using Chart Objects

Chart Objects Pane

Chart Objects List