The intervals array must contain an even number of entries (>=2), with
the even indices specifying the "on" intervals, and the odd indices
specifying the "off" intervals. phase is an offset into the intervals
array (mod the sum of all of the intervals). The intervals array
controlls the width of the dashes. The paint's strokeWidth controlls the
height of the dashes.
Note: this patheffect only affects drawing with the paint's style is set
to STROKE or STROKE_AND_FILL. It is ignored if the drawing is done with
style == FILL.
Parameters
intervals
| array of ON and OFF distances |
phase
| offset before the first ON interval is drawn
|