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ArrayIndexOutOfBounds exception when using Mesh library

[2 Replies]
- 23-Jul-2012 03:51 AM
- Forum: Contributed Library Questions
Hi,

I'm using Lee Byron's Mesh Library ( http://www.leebyron.com/else/mesh/) to create triangulations of source images. I am picking a random selection of pixels within the source image, and then using a Voronoi object to create the list of regions to draw. This works fine when I sample a smaller number of points, but when I increase the number of sample points to approximately 1500 or more, I get an exception when creating the Voronoi object:

Exception in thread "Animation Thread" java.lang.ArrayIndexOutOfBoundsException: 0

at megamu.mesh.IntArray.add(IntArray.java:22)

at megamu.mesh.Voronoi.<init>(Voronoi.java:127)

at MIF_delauney.setup(MIF_delauney.java:55)

at processing.core.PApplet.handleDraw(PApplet.java:1608)

at processing.core.PApplet.run(PApplet.java:1530)

at java.lang.Thread.run(Thread.java:680)

What is causing this exception? I can't figure out where I'm going out of bounds at all...

My code is as follows:

import megamu.mesh.*;

PImage img;

int[] delauney_points;

void setup() {

img = loadImage("newsobscura.jpeg");

size(img.width,img.height);

delauney_points = new int[0];

// pick N random points to sample

for (int i = 0; i < 3000; i++) {

delauney_points = (int[])append(delauney_points, floor(lerp(0, img.pixels.length, random(0,1) )));

}

float[][] points = new float[delauney_points.length][2];

for (int i=0; i<delauney_points.length; i++) {

points[i][0] = (delauney_points[i]%img.width);

points[i][1] = (delauney_points[i] - points[i][0])/img.width;

}

background(0);



stroke(255);

strokeWeight(2);

smooth();



img.loadPixels();



// create Voronoi object

Voronoi myVoronoi = new Voronoi( points );



// get regions

MPolygon[] myRegions = myVoronoi.getRegions();

for(int i=0; i<myRegions.length; i++)

{

// pick the colour of the cource pixel and use this colour to fill the shape

fill(red(img.pixels[delauney_points[i]]), green(img.pixels[delauney_points[i]]), blue(img.pixels[delauney_points[i]]));

myRegions[i].draw(this);

}



}

void draw() {

image(img, img.width, 0);

saveFrame("output.png");

}

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