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Index › Programming Questions & Help › Syntax Questions › Drawing a dashed line
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Drawing a dashed line (Read 1393 times)
tvirot
Drawing a dashed line
Jul 30th, 2008, 9:21pm  
Is there an easy way to draw a dashed line in Processing? I know that Java has BasicStroke class which allows users to create a dashed pattern, but I'm not sure if Processing also supports this.

Thanks!
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TM
Re: Drawing a dashed line
Reply #1 - Jul 31st, 2008, 12:28pm  
Hi, maybe have a look at lerp()

http://processing.org/reference/lerp_.html

quotted form the example:
Quote:
The lerp function is convenient for creating motion along a straight path and for drawing dotted lines


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PhiLho 
Re: Drawing a dashed line
Reply #2 - Jul 31st, 2008, 12:42pm  
Looks like it is simpler than I thought:
Code:
float[] dashes = { 16.0f, 8.0f, 4.0f, 8.0f };
BasicStroke pen;

void setup()
{
  size(400, 400);
  noLoop();
  pen = new BasicStroke(4.0f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_MITER,
	4.0f, dashes, 0.0f);

  Graphics2D g2 = ((PGraphicsJava2D) g).g2;
  g2.setStroke(pen);
}

void draw()
{
  line(0, 0, width, height);
  line(0, height, width, 0);
}
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tvirot
Re: Drawing a dashed line
Reply #3 - Jul 31st, 2008, 5:30pm  
Great! Thanks guys Smiley
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oompa_l
Re: Drawing a dashed line
Reply #4 - Sep 8th, 2008, 10:08pm  
that's great...i thought you would need some fancier method to construct it...new to processing, how do you know what arguments the BasicStroke constructor takes ?
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Cedric
Re: Drawing a dashed line
Reply #5 - Sep 9th, 2008, 1:34am  
We just had that topic some weeks ago :

http://processing.org/discourse/yabb_beta/YaBB.cgi?board=Syntax;action=display;num=1219255354
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oompa_l
Re: Drawing a dashed line
Reply #6 - Sep 9th, 2008, 4:07am  
am I missing something - there's no mention of the BasicStroke constructor on that page...
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PhiLho 
Re: Drawing a dashed line
Reply #7 - Sep 9th, 2008, 11:33am  
This kind of info can be found at the official Java site by Sun: BasicStroke. Smiley
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fry
Re: Drawing a dashed line
Reply #8 - Sep 9th, 2008, 7:10pm  
also keep in mind that this only works in the default renderer, and as with anything when you grab the Graphics2D object, don't be sad if it doesn't work as expected. (see the faq for more dire warnings re: don't use java graphics.)

sincerely,

the caveat police
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