Shouldnt these arcs pixel perfectly overlap? about bonsai HOT 4 OPEN

Thank you for posting an example. I cleaned up the first example:

new Path()
  .attr({x:30, y:50})
  .moveBy(50, 0)
  .arcBy(50, 50,  0, 0, 0,  50, 100)
  .stroke('red', 1)
  .addTo(stage);

When I run this in orbit with our SVG Renderer, I can see the following (simplified) representation:
<path d="M 0 0 m 50 0 a 50 50 0 0 0 50 100" style="red" fill="none" transform="matrix(1,0,0,1,30,50)"></path>

This seems to be correct. What do you mean by "pixel perfectly overlap"?

from bonsai.

I mean that when I run my snippet in orbit, I see that the lines don't perfectly overlap. It get's worse when you draw a circle under it.

Maybe I'm misunderstanding what arcs (can) do.. ?

from bonsai.

From where are you basing your assumption that these lines should overlap? You need to show how you made the calculations. It's very hard to tell how you determined the numbers you're using (e.g. the x and y values, and the radians used).

from bonsai.

Well the basis lies on the fact that the start and end points are perfectly vertical from each other, from a 2pi point of view (assuming 0 is to the right, though that doesn't really matter here). For each of the shapes, that should be the case (-0.9pi v 0.9pi, etc). In that light I was expecting circle parts of the same circle, just step-wise bigger each time (0.9, 0.7. 0.5, etc). And if they were indeed from the same circle, they should line up perfectly. It doesn't really matter how I got to the positioning, it's pretty clear they don't line up.

So maybe I'm not understanding arcBy, which is very well possible. But the lines don't line up either way. So if that was not supposed to happen, please disregard and close this ticket :)

from bonsai.