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Index › Programming Questions & Help › Syntax Questions › Obtain length of a curveVertex
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Obtain length of a curveVertex (Read 224 times)
TVS
Obtain length of a curveVertex
Mar 11th, 2009, 3:07pm  
Hey Processing community,

Short question, but with the knowledge I have of scripting a difficult one:
Can I somehow obtain the length of a curve, created with curveVertex.

My script is:
Code:

beginShape();
  curveVertex(xcl, -0, 0);
  for (int t=0; t<9; t++){
    curveVertex(xcl, -(t*baseDepth)/8, zValueY(maxColumnHeight, (t*baseDepth)/8));
  }
  curveVertex(xcl, -baseDepth, 0);
endShape();


This generates a nice smooth curve, but I need to use the length of this curve. Is there a function within Processing for this, and if not: anybody got an idea how I could determine the length?

Thanks in advance!
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PhiLho 
Re: Obtain length of a curveVertex
Reply #1 - Mar 11th, 2009, 4:32pm  
I believe it is a difficult problem, perhaps even insolvable, by mathematical means.
The best approach is to approximate the length by simulating the curve with lot of small line segments. Perhaps using the points you already use, if they are close enough and if the curve isn't too "curved" between them.
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WWW  
TVS
Re: Obtain length of a curveVertex
Reply #2 - Mar 11th, 2009, 4:39pm  
Yes, I was already afraid of that.
The problem is that I need to make my gridmesh very dens to create the points close enough to eachother for the approximation to still be valid...
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