CODEWITHSUNDEEP
mathopenglgeometry
Alex
Alex

Reputation: 541

Parallel Offset for Points (Curve/Slope)

I have an Array of Points (CGPoints) which form a curve, actually not a real curve but short line-segments. I need a parallel offset of that curve. Just moving the curve down obviously results in thinner segments if the slope is steep. Any ideas on how i could approach this?

Upvotes: 1

Views: 1684

Answers (1)

Ani
Ani

Reputation: 10896

You will need to compute the tangent/normal per segment and then translate the points along the normal.

For a polyline - the normal at a vertex is some combination ((n1 + n2) / 2?) of the two segment normals it straddles, so you may need to take that into account during your "offset" curve computation.

Actually - all you need is the Normal - as indicated here.

Hope this helps.

Upvotes: 1

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