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copied!<p>Compare function recieves arguments <code>a</code> and <code>b</code>.</p> <p>It must return </p> <ul> <li>-1 if <code>a</code> has to be placed before <code>b</code></li> <li>0 if positions of <code>b</code> and <code>a</code> are equal</li> <li>1 if <code>a</code> has to be placed after <code>b</code></li> </ul> <p>You are returning whatever values, not just those three listed, which is why order gets messed up.</p> <p>Compare the results in example below.</p> <pre><code>var test:Vector.<Number>; // returning whatever the difference is var sortMethod1:Function = function (a:Number, b:Number) : Number { var value:Number = a-b; trace(a+"\t"+b +"\t= "+ value); return value; } // returning -1, 0, 1 var sortMethod2:Function = function (a:Number, b:Number) : int { var result:int; if (a < b) { result = -1; } else if (a > b) { result = 1; } else { result 0; } trace(a+"\t"+b +"\t: "+ result); return result; } test = new <Number>[1.2,1.1,1.4,1.5,0]; trace("BEFORE", test); test.sort(sortMethod1); trace("AFTER1", test); trace("--"); test = new <Number>[1.2,1.1,1.4,1.5,0]; trace("BEFORE", test); test.sort(sortMethod2); trace("AFTER2", test); /* Trace output: BEFORE 1.2,1.1,1.4,1.5,0 1.1 1.4 = -0.2999999999999998 1.2 1.4 = -0.19999999999999996 1.5 1.4 = 0.10000000000000009 0 1.4 = -1.4 0 1.4 = -1.4 1.1 1.2 = -0.09999999999999987 0 1.2 = -1.2 1.5 1.2 = 0.30000000000000004 1.5 1.2 = 0.30000000000000004 0 1.2 = -1.2 0 1.1 = -1.1 AFTER1 0,1.1,1.2,1.5,1.4 -- BEFORE 1.2,1.1,1.4,1.5,0 1.1 1.4 : -1 1.2 1.4 : -1 1.5 1.4 : 1 0 1.4 : -1 1.5 1.4 : 1 0 1.4 : -1 0 1.1 : -1 1.1 1.2 : -1 AFTER2 0,1.1,1.2,1.4,1.5 */ </code></pre> <p><strong>EDIT</strong> In your case that would be the following:</p> <pre><code>private function cmpr(h1:HelpObj, h2:HelpObj):int { var hx1:Number = h1.value.x; var hx2:Number = h2.value.x; if (hx1 < hx2) { return -1; } if (hx1 > hx2) { return 1; } var hy1:Number = h1.value.y; var hy2:Number = h2.value.y; if (hy1 < hy2) { return -1; } if (hy1 > hy2) { return 1; } return 0; } </code></pre>

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