how to create triangle in handle d3.js

[conextium27]

hi
how to create a triangle in handle, brush i can't make
my based code
https://github.com/d3/d3-brush/blob/master/src/brush.js#L177

handle actually

[mbostock]

Please use Stack Overflow tag d3.js to ask for help. Stack Overflow provides a better collaborative forum: thousands of D3-related questions have been asked there, and some answers may be relevant to you.

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