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Index › Programming Questions & Help › Syntax Questions › creating a vector image from a group of points
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creating a vector image from a group of points (Read 579 times)
punchik
creating a vector image from a group of points
May 30th, 2009, 7:12am  
hi list, i have a group of points stored in an array. How can i create  a vector image from those points? is that posible?


many thanks


P.
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PhiLho 
Re: creating a vector image from a group of points
Reply #1 - May 30th, 2009, 8:22am  
Yes, it is possible.

Example:
Code:
int[] coordinates =
{
  10, 10,
  50, 100,
  120, 170,
  200, 60
};

void setup()
{
  size(250, 250);
  stroke(#0088DD);
  background(255);
  
  // Note I start at 2
  int len = coordinates.length;
  for (int i = 2; i < len - 1; i += 2)
  {
    line(coordinates[i - 2], coordinates[i - 1], coordinates[i], coordinates[i + 1]);
  }
  // If you want to close the shape
  line(coordinates[len - 2], coordinates[len - 1], coordinates[0], coordinates[1]);
}

You can also look at Vertex at the reference page.
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punchik
Re: creating a vector image from a group of points
Reply #2 - May 30th, 2009, 1:08pm  
hi philho , i know i can do that, but is that the same as vector images? i thought a line was not a vector image as for example in flash, is it the same?
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PhiLho 
Re: creating a vector image from a group of points
Reply #3 - May 31st, 2009, 12:32am  
It depends on your final goal.

If by "create  a vector image" you mean "create a vector image file", it needs some extra steps, indeed. But then, you must indicate which format you need, the most popular 2D ones being SVG and PDF (the latter being trivial to do in Processing).

If that's "to get the same rendering as a vector image, keeping the quality through scaling and rotating", as opposed to bitmap images, line() fills the bill. Now it might take a few extra steps to replay the image after moving, scaling and rotating.

A vector image is an abstract set of coordinates and information (fill/stroke colors, kind of shape, etc.) which is rendered on screen by some software (PDF reader, Flash viewer, SVG viewer, etc.).
So somehow Processing is such kind of viewer, with a vector language which is a derivative of Java...
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