Pastable version of Zig Zag ordering of array

<pre class='prettyprint' language='java'>public static int[] zigzagify(int[] array, int xmax, int ymax) {
        int[] zz = new int[array.length]; //zigzag array
        if (array.length != xmax * ymax) {
            throw new IllegalArgumentException();
        }
        int ai = 0; //original array index
        int zzi = 0; //zigzag array index
        int x = 0; //x position
        int y = 0; //y position
        zz[zzi] = array[ai];
        while (y * xmax + x &lt; xmax * ymax - 1) {
            if(x&lt;xmax-1) x++;
            else y++;
            zzi++;
            ai = y * xmax + x;
            System.out.println(&quot;x &quot;+x+&quot;, y &quot;+y+&quot;, zzi &quot;+zzi+&quot;, ai &quot;+ai);
            
            zz[zzi] = array[ai];
            
            while (x &gt; 0 &amp;&amp; y &lt; ymax-1) {
                x--;
                y++;
                zzi++;
                ai = y * xmax + x;
                System.out.println(&quot;x &quot;+x+&quot;, y &quot;+y+&quot;, zzi &quot;+zzi+&quot;, ai &quot;+ai);
                zz[zzi] = array[ai];
                
            }
            
            if(y&lt;ymax-1) y++;
            else x++;
            zzi++;
            ai = y * xmax + x;
            System.out.println(&quot;x &quot;+x+&quot;, y &quot;+y+&quot;, zzi &quot;+zzi+&quot;, ai &quot;+ai);
            zz[zzi] = array[ai];
            
            while (y &gt; 0 &amp;&amp; x &lt; xmax-1) {
                y--;
                x++;
                zzi++;
                ai = y * xmax + x;
                System.out.println(&quot;x &quot;+x+&quot;, y &quot;+y+&quot;, zzi &quot;+zzi+&quot;, ai &quot;+ai);
                zz[zzi] = array[ai];
                
            }
        }

return zz;
    }</pre>
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Pastable version of Zig Zag ordering of array