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/* darkstat 3
* copyright (c) 2006, 2007 Emil Mikulic.
*
* graph.js: graph renderer
*
* You may use, modify and redistribute this file under the terms of the
* GNU General Public License version 2. (see COPYING.GPL)
*
* ---------------------------------------------------------------------
* In my testing, this script worked correctly in:
* - Firefox 1.5.0.4, 2.0.0.1
* - IE 6.0
* - Opera 8.53
*/
/* need:
* - graph_width
* - graph_height
* - bar_gap
*
* - graphs [ {id, name, title, bar_secs} ]
* - graphs_uri
*
* - window.onload = graph_loader
*
* in CSS:
* - div.graph
* - div.graph div.bar_in
* - div.graph div.bar_out
* - div.graphtitle
*/
function killChildren(elem) {
while (elem.childNodes.length > 0)
elem.removeChild( elem.childNodes.item(0) );
}
function thousands(n) {
var s = String(n);
var out = "";
while (s.length > 3) {
out = "," + s.substr(-3) + out;
s = s.substr(0, s.length - 3);
}
return s+out;
}
var xh;
function graph_loader() {
for (var i=0; i<graphs.length; i++) {
graphs[i].graph = document.getElementById( graphs[i].id );
killChildren(graphs[i].graph);
graphs[i].graph.appendChild(
document.createTextNode("Loading..."));
}
/* create buttons */
var b_reload = document.createElement("a");
b_reload.setAttribute("id", "graph_reload");
b_reload.setAttribute("href", "javascript:graph_reload()");
b_reload.appendChild(
document.createTextNode("reload graphs"));
document.getElementById("graph_buttons").appendChild(b_reload);
graph_reload();
}
function graph_reload() {
document.getElementById("graph_reload").innerHTML = "loading...";
xh = (window.ActiveXObject)
? new ActiveXObject("Microsoft.XMLHTTP")
: new XMLHttpRequest();
var asyncFlag = true;
xh.open("GET", graphs_uri, asyncFlag);
// try to nerf caching:
xh.setRequestHeader("If-Modified-Since", "Sat, 1 Jan 2000 00:00:00 GMT");
xh.onreadystatechange = poll;
xh.send(null);
}
function poll() {
var STATE_COMPLETE = 4;
if (xh && xh.readyState == STATE_COMPLETE) {
for (var i=0; i<graphs.length; i++)
{
g = xh.responseXML.getElementsByTagName(graphs[i].name);
buildGraph(graphs[i].graph, graphs[i].title, graphs[i].bar_secs,
g[0].getElementsByTagName("e"));
}
document.getElementById("graph_reload").innerHTML = "reload graphs";
head = xh.responseXML.childNodes[0];
document.getElementById("tb").innerHTML = head.getAttribute("tb");
document.getElementById("tp").innerHTML = head.getAttribute("tp");
document.getElementById("rf").innerHTML = head.getAttribute("rf");
}
}
function addBar(graph, title, barclass, width, height, left, bottom) {
if (height == 0) return; /* not visible */
var bar = document.createElement("div");
bar.setAttribute("title", title);
bar.setAttribute("class", barclass);
bar.setAttribute("className", barclass); //IE
bar.style.cssText =
"width:"+width+"px; "+
"height:"+height+"px; "+
"position: absolute; "+
"left:"+left+"px; "+
"bottom:"+bottom+"px;";
bar.setAttribute("style", bar.style.cssText);
graph.appendChild(bar);
}
function kbps(bps) {
bps /= 1024;
if (bps < 1) return bps.toPrecision(2);
else return bps.toFixed(1);
}
function buildGraph(graph, title, bar_secs, elems) {
var total_max = 0;
var data = []; /* list of [in, out] */
for (var i=0; i<elems.length; i++) {
var elem = elems.item(i);
var b_pos = Number( elem.getAttribute("p") );
var b_in = Number( elem.getAttribute("i") );
var b_out = Number( elem.getAttribute("o") );
var b_total = b_in + b_out;
/* FIXME: what happens when a bar's value is >4G? */
if (b_total > total_max)
total_max = b_total;
data.push( [b_pos, b_in, b_out] );
}
var igraph = document.createElement("div"); // inner graph
igraph.setAttribute("class", "graph");
igraph.setAttribute("className", "graph"); //IE
igraph.style.cssText =
"width:"+graph_width+"px; "+
"height:"+graph_height+"px; "+
"position:relative;";
igraph.setAttribute("style", igraph.style.cssText);
var nbars = data.length;
var b_width = (graph_width - bar_gap * (nbars-1)) / nbars;
var next_xofs = 0;
for (var i=0; i<nbars; i++) {
var b_p = data[i][0];
var b_i = data[i][1];
var b_o = data[i][2];
var xofs = next_xofs;
next_xofs = Math.round((b_width + bar_gap) * (i+1));
var curr_w = next_xofs - xofs - bar_gap;
var h_i = Math.round( b_i * graph_height / total_max );
var h_o = Math.round( b_o * graph_height / total_max );
var label = b_p+": "+
thousands(b_i)+" bytes in, "+
thousands(b_o)+" bytes out | "+
kbps(b_i/bar_secs)+" KB/s in, "+
kbps(b_o/bar_secs)+" KB/s out";
addBar(igraph, label, "bar_in", curr_w, h_i, xofs, 0);
addBar(igraph, label, "bar_out", curr_w, h_o, xofs, h_i);
}
var gtitle = document.createElement("div");
gtitle.setAttribute("class", "graphtitle");
gtitle.setAttribute("className", "graphtitle"); //IE
gtitle.style.cssText =
"width:"+graph_width+"px;";
gtitle.setAttribute("style", gtitle.style.cssText);
gtitle.appendChild(document.createTextNode(title));
killChildren(graph);
graph.appendChild(igraph);
graph.appendChild(gtitle);
}
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