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    /**

     * Sets the values to define an arc.

     * @param center The center of the arc.

     * @param radius The radius.

     * @param startAngle The start angle of the arc (in radians)

     * @param angleExt The angular extent of the arc (in radians). 

     * 

     * The sign convention is: 

     * 

     * startAngle = 0 is "3 o'clock"; 

     * startAngle = (PI / 3) is "1 o'clock"; 

     * angleExt > 0 means "advancing clockwise"; 

     * angleExt < 0 means "advancing counterclockwise".

     */

    void setPointsStartExt (Point center, double radius, double startAngle, double angleExt);

    /**

     * Sets the values to define an arc. The arc will go from

     * startAngle to endAngle clockwise. Angles will be

     * normalized to ]-PI, PI] (-PI excluded) before creating

     * the arc. 

     * 

     * @param center The center of the arc.

     * @param radius The radius.

     * @param startAngle The start angle of the arc (in radians)

     * @param endAngle The end angle of the arc (in radians). 

     * 

     */

    void setPointsStartEnd (Point center, double radius, double startAngle, double endAngle );