path.arcTo(x1, y1, x2, y2, radius)
Draws a circular arc segment with the specified radius that starts tangent to the line between the current point and the specified point ⟨x1, y1⟩ and ends tangent to the line between the specified points ⟨x1, y1⟩ and ⟨x2, y2⟩. If the first tangent point is not equal to the current point, a straight line is drawn between the current point and the first tangent point. Equivalent to context.arcTo and uses SVG’s elliptical arc curve commands.
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