Processing 1.0 - Processing Discourse - drawing lines: 'exceeds the code limit' Error

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Index › Programming Questions & Help › Syntax Questions › drawing lines: 'exceeds the code limit' Error

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drawing lines: 'exceeds the code limit' Error (Read 869 times)

michael1

drawing lines: 'exceeds the code limit' Error
Mar 9^th, 2006, 5:29pm

Hello All,

When I try to draw very long lines (several thousand vertices) or when I draw several thousand short lines, I get the following error:

/tmp/build28588.tmp/Temporary_820_8030.java:1:325:2770:1: Semantic Error: Method "void draw();" in type "Temporary_820_8030" produced a code attribute that exceeds the code limit of 65535 elements.

The draw function I use is basically this:

void draw() {
beginShape (LINE_STRIP) ; vertex ( 129, 775) ; vertex ( 129, 750) ; endShape () ;
beginShape (LINE_STRIP) ; vertex ( 129, 805) ; vertex ( 129, 748) ; endShape () ;
}

(...yet I either have several thousand more shapes, or have a few shapes with several thousand vertices.)

Is there any way to draw a large number of lines or to draw very long lines without obtaining this error? (I do not need the image to be continuously redrawn as there is no development or motion)

Thanks very much!

Michael

TomC

Re: drawing lines: 'exceeds the code limit' Error
Reply #1 - Mar 9^th, 2006, 5:41pm

Google matches for that error are thin on the ground, but this cache link seems to give a hint.

Are you storing all your coordinates inside the source code Apparently there is a limit on the size of a Java class file (or possibly a method in a class file, I'm not sure) that means that sometimes this just isn't practical.

You might have luck storing the coordinates in a text file and loading them at run time. If you're not sure how to do that, post back and I'll see if I can find some example code.

{sketches,links,blogs,hacks}

TomC

Re: drawing lines: 'exceeds the code limit' Error
Reply #2 - Mar 9^th, 2006, 5:47pm

You might also have luck using LINES instead of lots of separate line strips.

Your example code:

Code:


void draw() {  
  beginShape(LINE_STRIP);
  vertex(129, 775);
  vertex(129, 750);
  endShape();  
  beginShape(LINE_STRIP);
  vertex(129, 805);
  vertex(129, 748);
  endShape();  
}

Is the same as:

Code:


void draw() {  
  beginShape(LINES);
  vertex(129, 775);
  vertex(129, 750);
  vertex(129, 805);
  vertex(129, 748);
  endShape();  
}

Which is basically the same as:

Code:


void draw() {  
  line(129, 775, 129, 750);
  line(129, 805, 129, 748);
}

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fry

Re: drawing lines: 'exceeds the code limit' Error
Reply #3 - Mar 9^th, 2006, 6:07pm

this is the same as this issue:
http://processing.org/discourse/yabb_beta/YaBB.cgi?board=Programs;action=display;num=1140882603
or this guy:
http://processing.org/discourse/yabb/YaBB.cgi?board=Programs;action=display;num=1107292834

you should load all the vertex information from a file and then use a for() loop to iterate through the array of data, rather than including all of it in the draw method. also, if you're just drawing a single line, you can use the line() command instead of beginShape(), or as TomC notes, use beginShape(LINES), followed by several calls to vertex(), then endShape().

michael1

Re: drawing lines: 'exceeds the code limit' Error
Reply #4 - Mar 9^th, 2006, 6:37pm

Thank you very much for your responses.

Tried using the simpler "lines' command, yet this produces the same error once I get beyond about 5000 lines.

So I'll try loading the vertex information from a text file instead.

TomC, in case you have a sample file that shows how to read and segment info from a text file, I'd really appreciate it.

Thanks again!

TomC

Re: drawing lines: 'exceeds the code limit' Error
Reply #5 - Mar 9^th, 2006, 7:19pm

Briefly, for a text file points.txt which contains no blank lines, and looks something like:

Code:

Then something like...

Code:



// arrays for x and y
int[] x;
int[] y;

void setup() {
  size(150,900);
  String[] lines = loadStrings("points.txt");
  x = new int[lines.length];
  y = new int[lines.length];
  for (int i = 0; i < lines.length; i++) {
    int[] coords = int(split(lines[i]));
    x[i] = coords[0];
    y[i] = coords[1];
  }
}

void draw() {
  background(255);
  stroke(0);
  beginShape(LINES);
  for (int i = 0; i < x.length; i++) {
    vertex(x[i],y[i]);
  }
  endShape();
}

...should do the trick. Untested with large files, so may have silly errors.

Your mileage may vary for float coordinates, unreliable text files, line loops, stroke weights, colours, 3D, etc.

Look up the definitions of loadStrings(), split() and int() in the reference to see what's going on.

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