1 <?xml version="1.0" encoding="utf-8"?>
2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
3 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
4 <html xml:lang="en" lang="en" xmlns="http://www.w3.org/1999/xhtml">
13 function drawplot(times, color) {
14 var tfact = ww / (tmax - tmin);
20 for (i = 1; i < times.length; i++) {
21 height[i] = 1 / (times[i][0] - times[i-1][0]);
22 if (hmax < height[i]) hmax = height[i];
24 height[i+1] = height[i];
27 context.moveTo(0, wh - height[1]*hfact);
28 for (i = 1; i < times.length; i++) {
29 context.lineTo((times[i][0] - tmin)*tfact,wh - height[i]*hfact);
30 context.lineTo((times[i][0] - tmin)*tfact,wh - height[i+1]*hfact);
32 context.strokeStyle = color;
35 function gotdata(data) {
36 canvas = document.getElementById("plot");
37 context = canvas.getContext("2d");
42 document.getElementById("cold").innerHTML = data.current.cold / 100;
43 document.getElementById("hot").innerHTML = data.current.hot / 100;
44 drawplot(data.cold, "blue");
45 drawplot(data.hot, "red");
66 border: solid 1px black;
71 background-color: #d0e0ff;
75 background-color: #ffd0e0;
85 border: solid 1px black;
88 <title>Water Meters</title>
91 <div id="currentvals">
93 <div class="current" id="cold">cold</div>
94 <div class="current" id="hot">hot</div>
97 <canvas id="plot" width="640" height = "480"></canvas>
102 var xmlhttp = new XMLHttpRequest();
103 var url = "query.cgi";
104 var qstr = "?lo=2015-12-19+00:00:00&hi=2015-12-20+00:00:00";
106 xmlhttp.onreadystatechange = function() {
107 if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
108 document.getElementById("debug").innerHTML = xmlhttp.responseText;
109 var myData = JSON.parse(xmlhttp.responseText);
113 xmlhttp.open("GET", url+qstr, true);