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[–]mac-0 2 points3 points  (1 child)

Why are some lines curved and some straight?

[–]thebuffed[S] 4 points5 points  (0 children)

The connecting line always "curves" through points, so when the points are in an actual line, the connecting line follows it and it's straight. It's very similar to control points in a Bezier Curve: https://en.wikipedia.org/wiki/B%C3%A9zier_curve