arrow -- A marker to add to paths

Description

Must be used as styling options "marker-start", "marker-mid" or "marker-end", to add an arrow to a path. Argument is size of arrow.

i1 : Polyline{PointList=>{[0,0],[50,50],[0,100],[50,150]},"stroke"=>"yellow","stroke-width"=>5,"marker-end"=>arrow(10,"fill"=>"orange"),Margin=>0.3}

o1 = Polyline{cache => CacheTable{}                         }
              Margin => .3
              PointList => {| 0 |, | 50 |, |  0  |, |  50 |}
                            | 0 |  | 50 |  | 100 |  | 150 |
                            | 0 |  |  0 |  |  0  |  |  0  |
                            | 1 |  |  1 |  |  1  |  |  1  |
              style => MutableHashTable{...3...}

o1 : Polyline

For the programmer

The object arrow is a function closure.