Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
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?
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.