| Allegro CL version 10.1Unrevised from 10.0 to 10.1. 10.0 version |

**Arguments: ***
center smaj-axis smin-axis smaj-axis-angle start-angle length-angle
*

This function may be used to find the x and y coordinates of the endpoints of an elliptical arc that was drawn (or might be drawn). This may be needed for example when drawing a pie chart where you need to draw an elliptical arc and then draw straight lines from its endpoints to the arc center.

The arguments should be the same as those passed to the functions
**draw-ellipse-arc**,
**draw-ellipse-sector**, and **fill-ellipse-sector**
(excluding the initial *stream* argument to those
functions).

**ellipse-start-and-end** returns four
values:

- the x coordinate of the starting point
- the y coordinate of the starting point
- the x coordinate of the ending point
- the y coordinate of the ending point

This function may also be used along with **draw-circle-arc**, **draw-circle-sector**, and **fill-circle-sector** by
passing the radius for both *smaj-axis* and
*smin-axis*, and passing 0 for
*smaj-axis-angle*.

Other calculations similar to the one performed by this function could
be done by calling the Common Lisp trigonometry functions such as
**sin** and **cos**. But note that the angle
arguments to those functions are in radians, while angle arguments to
Common Graphics functions are in degrees. To convert from degrees to
radians, multiply degrees by the value returned by ```
(/ (* 2.0
pi) 360.0)
```

. (That value is a double-float. Coerce it to a
single-float if you wish to work with single-floats.)

Copyright (c) 1998-2022, Franz Inc. Lafayette, CA., USA. All rights reserved.

This page was not revised from the 10.0 page.

Created 2019.8.20.

| Allegro CL version 10.1Unrevised from 10.0 to 10.1. 10.0 version |