I cant find a way to set width to line. I think this would also be very usefull feature in a constructor, but my guess is lines just dont work like that.
scaling doesnt work, it just changes location of, neither does width and height.
Try it yourself 
Unfortunately this is a OpenGL problem, the spec doesn’t require allowing to change the width of a line 
javascript - How to use gl.lineWidth() - Stack Overflow To achieve the effect of “thicker” lines people usually create cylinder meshes.
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