ActionScript 3.0 :: Calculating And Evaluating A Predefined Path?
Nov 22, 2011
i have a small challenge calculating and evaluating a predefined path
here is my challenge in short.
- i got a path as a single color line on a white background (bitmap object but could as well be a vector shape)
- the path is a closed loop path (like a twisted and bend circle, let's call it a bean shape).
- i then need to move an object along this path in x steps but only once and stop exactly where it started
This means, i need to:
- find a start end point
- calculate the length of the path
- set keynodes along the path with X amount of spacing between (length/x)
- it got to be semi precise (within 1-2 px.)
one idea could be to loop throught the pixels till to find a color pixel and use this as the starting point, then use an vector with a predefined length (ex. 5 px) "rotate" it till it find a new color pixels and mark this as a new node, repeat the process till you get close to the starting point, and by using Trial and error you'll eventually have mapped the path, but this method is clumsy and not very accurate, if you don't hit the starting point spot on the first time, you'll recalculate everything over again.
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