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var switches = [];
var last_dataset = [];
get_switches();
get_ping();
function json_request(url, func, repeat_ms) {
var request = new XMLHttpRequest();
request.open('GET', url, true);
request.onload = function() {
if (this.status >= 200 && this.status < 400) {
func(JSON.parse(this.response));
} else if (this.status != 410) {
json_request(url, func, repeat_ms);
}
};
request.onerror = function() {
json_request(url, func, repeat_ms);
};
request.send();
}
function get_switches() {
json_request('/switches-json.pl', draw_switches, 1000);
}
function get_ping() {
json_request('/ping-json.pl', update_ping, 1000);
}
function draw_switches(json) {
for (var switchnum in switches) {
document.body.removeChild(switches[switchnum]);
}
switches = [];
for (var switchnum in json) {
var s = json[switchnum];
create_switch(switchnum,
s['sysname'],
parseInt(s['x']),
parseInt(s['y']),
parseInt(s['width']),
parseInt(s['height']));
}
setTimeout(get_switches, 60000);
really_update_ping(last_dataset);
}
function update_ping(json) {
last_dataset = json;
really_update_ping(json);
setTimeout(get_ping, 1000);
}
function really_update_ping(json) {
for (var switchnum in switches) {
if (json[switchnum] === null || json[switchnum] === undefined) {
switches[switchnum].style.backgroundColor = '#0000ff';
} else {
// 10ms is max
var l = json[switchnum] / 10.0;
if (l >= 1.0) { l = 1.0; }
l = Math.pow(l, 1.0/2.2);
l = Math.round(l * 255.0);
switches[switchnum].style.backgroundColor = 'rgb(' + l + ', 255, 0)';
}
}
}
function create_switch(switchnum, sysname, x, y, width, height) {
var s = document.createElement("div");
var map = document.getElementById('map');
var top_offset = map.getBoundingClientRect().top;
var left_offset = map.getBoundingClientRect().left;
s.style.position = 'absolute';
s.style.left = (left_offset + x) + 'px';
s.style.top = (top_offset + y) + 'px';
s.style.width = width + 'px';
s.style.height = height + 'px';
s.style.backgroundColor = '#0000ff';
s.style.border = '1px solid black';
switches[switchnum] = s;
var text = document.createTextNode(sysname);
s.appendChild(text);
document.body.appendChild(s);
}
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