canvas - Variable length arrow with FabricJS Path() -

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i'm trying make variable length arrow in fabric.js using path().

new fabric.path('m 0 0 l 150 0 m 0 0 l 10 -10 m 0 0 l 10 10 z', {});

this creates fixed length arrow, i'd work follows:

  • click on canvas, arrow tip appears (keep mouse down , drag endposition)
  • when drag arrow endposition line gets longer tip stays same size
  • still while dragging line stays attached point of origin , whole arrow rotates around until dragging stops

can done? , how create functionality?

help appreciated!

edit:

found fiddle http://jsfiddle.net/7a5ms/51/ i'm looking for, calculation of arrow angle off. anyone?

managed code working fiddle.


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