ActionScript 2.0 Language Reference - Adobe Help and Support

jointStyle:String - Added in Flash Player 8. A string that specifies the type of joint
appearance used at angles. Valid values are: "round", "miter", and "bevel". If a value is not
indicated, Flash uses round joints.
For example, the following illustrations show the different capsStyle settings. For each
setting, the illustration shows an angled blue line with a thickness of 30 (for which the
jointStyle applies), and a superimposed angled black line with a thickness of 1 (for which
no jointStyle applies):
Notice that for jointStyle set to "miter", you can limit the length of the miter point by
using the miterLimit parameter.
miterLimit:Number - Added in Flash Player 8. A number that indicates the limit at which a
miter is cut off. Valid values range from 1 to 255 (and values outside of that range are rounded
to 1 or 255). This value is only used if the jointStyle is set to "miter". If a value is not
indicated, Flash uses 3. The miterLimit value represents the length that a miter can extend
beyond the point at which the lines meet to form a joint. The value expresses a factor of the
line thickness. For example, with a miterLimit factor of 2.5 and a thickness of 10 pixels,
the miter is cut off at 25 pixels.
For example, consider the following angled lines, each drawn with a thickness of 20, but
with miterLimit set to 1, 2, and 4. Superimposed are black reference lines showing the
meeting points of the joints:
Notice that for a given miterLimit value, there is a specific maximum angle for which the
miter is cut off. The following table lists some examples:
Value of miterLimit
value:
Angles smaller than
this are cut off:
1.414 90 degrees
2 60 degrees
MovieClip 899