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Dijkstra
<html>
<head>
<title>Dijkstra Algorithms</title>
</head>
<body>
<script language = "javascript">
<!--
var nilaiacuan = 10000;
var takterdefinisi = -1;
var namaverteks = new Array("A","B","C","D","E","F");
var matriks = new Array(6);
function bobot(a,b)
{
return matriks[a][b];
}
function dijkstra(jumlahverteks,awal,d)
{
var posisi = new Array(jumlahverteks);
var i;
var kunjungan = new Array(jumlahverteks);
var sebelum = new Array(jumlahverteks);
for(i=0;i<jumlahverteks;i++)
{
posisi[i] = nilaiacuan;
sebelum[i] = takterdefinisi;
kunjungan[i] = false;
}
posisi[awal]=0;
var verteks;
for(verteks=0;verteks<jumlahverteks;verteks++)
{
var jarakterpendek = nilaiacuan,
berhenti = -1;
for(i=0;i<jumlahverteks;i++)
{
if(!kunjungan[i])
{
if(posisi[i] <= jarakterpendek)
{
jarakterpendek = posisi[i];
berhenti = i;
}
}
}
kunjungan[berhenti] = true;
for(i=0;i<jumlahverteks;i++)
{
if(!kunjungan[i])
{
var w = bobot(berhenti,i);
if(posisi[berhenti]+w < posisi[i])
{
posisi[i] = posisi[berhenti] + w;
sebelum[i] = berhenti;
}
}
}
}
i=d;
if(posisi[i] < nilaiacuan)
{
var lintasan = namaverteks[i];
var verteks = i;
while(verteks>0)
{
verteks = sebelum[verteks];
if(verteks>=0)
lintasan = namaverteks[verteks] + '->' + lintasan;
}
alert("Jarak : "+posisi[i]+' ('+lintasan+')'+'<br>');
}
else
{
alert("Tidak ada jalur");
}
}
function init()
{
var x = nilaiacuan;
document.write('<pre>');
document.write('<br>');
document.write(matriks[0] = new Array(0,2,3,x,x,x));
document.write('<br>');
document.write(matriks[1] = new Array(2,0,3,6,x,x));
document.write('<br>');
document.write(matriks[2] = new Array(3,3,0,3,5,x));
document.write('<br>');
document.write(matriks[3] = new Array(x,6,3,0,1,3));
document.write('<br>');
document.write(matriks[4] = new Array(x,x,5,1,0,1));
document.write('<br>');
document.write(matriks[5] = new Array(x,x,x,3,1,0));
document.write('<br>');
document.write('</pre>');
var awal='<pre>';
document.write(awal+'A--2-B--6--D--3-F'+'<br>');
document.write(' \\ | / | / '+'<br>');
document.write(' 3 3 3 1 1 '+'<br>');
document.write(' \\ | / | / '+'<br>');
document.write(' \\|/ |/'+'<br>');
document.write(' C--5--E'+'<br>');
document.write('</pre>');
}
init();
var dari=0;
var ke=5;
dijkstra(matriks.length,dari,ke);
//-->
</script>
</body>
</html>
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