WarpDrive PHP Navigator

<style>
.jump.striked{text-decoration:line-through;}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.1/jquery.min.js"></script>
<form>
Current X: <input name="curX" value="<?=@$_REQUEST["curX"]?>"><br/>
Current Z: <input name="curZ" value="<?=@$_REQUEST["curZ"]?>"><br/>
Dst X: <input name="dstX" value="<?=@$_REQUEST["dstX"]?>"><br/>
Dst Z: <input name="dstZ" value="<?=@$_REQUEST["dstZ"]?>"><br/>
<label><input type="checkbox" name="no_hyper" value="1"<?=@$_REQUEST["no_hyper"]?' checked="checked"':''?> /> no Hyperspace</label><br/>
<input type="submit"/>
</form>
<?
define("MAXWARP",1280);
define("MAXLONGWARP",128000);
define("LONGMULT",100);
$noHyper = @$_REQUEST["no_hyper"]?true:false;
if (isset($_REQUEST['curX'])){
    $cX = intval($_REQUEST['curX'])?intval($_REQUEST['curX']):0;
    $cZ = intval($_REQUEST['curZ'])?intval($_REQUEST['curZ']):0;
    $X = intval($_REQUEST['dstX'])?intval($_REQUEST['dstX']):0;
    $Z = intval($_REQUEST['dstZ'])?intval($_REQUEST['dstZ']):0;

    $trX="<b>W</b>est";
    if ($X>$cX){
        $trX="<b>E</b>ast";
    }
    $trZ="<b>N</b>orth";
    if ($Z>$cZ){
        $trZ="<b>S</b>outh";
    }

    $dX = abs($X-$cX);
    $dZ = abs($Z-$cZ);

    $jumps = array();
    echo "dX: ".$dX."<br/>";
    echo "dZ: ".$dZ."<br/>";
    while($dX>0){
        if ($dX>MAXWARP){
            if ($noHyper){
                $jumps[] = "Jump ".MAXWARP." to ".$trX;
                $dX-=MAXWARP;
                continue;
            }
            if ($dX>MAXLONGWARP){
                $jumps[] = "Hyperjump ".floor(MAXLONGWARP/LONGMULT)." to ".$trX." (".MAXLONGWARP.")";
                $dX-=MAXLONGWARP;
                continue;
            }
            $jumps[] = "Hyperjump ".floor($dX/LONGMULT)." to ".$trX." (".(floor($dX/LONGMULT)*LONGMULT).")";
            $dX-=floor($dX/LONGMULT)*LONGMULT;
            continue;
        }
        $jumps[] = "Jump ".$dX." to ".$trX;
        $dX-=$dX;
    }
    while($dZ>0){
        if ($dZ>MAXWARP){
            if ($noHyper){
                $jumps[] = "Jump ".MAXWARP." to ".$trZ;
                $dZ-=MAXWARP;
                continue;
            }
            if ($dZ>MAXLONGWARP){
                $jumps[] = "Hyperjump ".floor(MAXLONGWARP/LONGMULT)." to ".$trZ." (".MAXLONGWARP.")";
                $dZ-=MAXLONGWARP;
                continue;
            }
            $jumps[] = "Hyperjump ".floor($dZ/LONGMULT)." to ".$trZ." (".(floor($dZ/LONGMULT)*LONGMULT).")";
            $dZ-=floor($dZ/LONGMULT)*LONGMULT;
            continue;
        }
        $jumps[] = "Jump ".$dZ." to ".$trZ;
        $dZ-=$dZ;
    }
    ?><div style="font-size:22px;"><?
    foreach ($jumps as $jump){
        echo '<div class="strikeable"><label><input type="checkbox" class="strikeonchange" /><span class="jump">'.$jump."</span></label></div>";
    }
    ?></div><?
}?>
<script>
    $(function(){
        $('.strikeonchange').change(function(){
            if (this.checked){
                $(this).parent().find('.jump').addClass('striked');
            } else {
                $(this).parent().find('.jump').removeClass('striked');
            }
        });
    })
</script>