<html xml:lang="en" lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<script>
- var canvas;
- var context;
- var ww;
- var wh;
- var tmin;
- var tmax;
- function drawplot(times, color) {
- var tfact = ww / (tmax - tmin);
+ var dbg;
+ var xmlhttp;
+ var canvas, ctx;
+ var ww, wh;
+ var hmax, hfact;
+ var tmin, tmax, tfact;
+ var xzero = 20, yzero = 20;
+ var cold_d = [], hot_d = [];
+
+ function showdate(utime) {
+ var dt = new Date(utime*1000);
+ return dt.toLocaleDateString() + " " + dt.toLocaleTimeString();
+ }
+
+ function getcomb(lo, hi) {
+ var comb = [], lb = [];
+ var d = hi - lo;
+ var ord = Math.pow(10, Math.floor(Math.log10(d)));
+ var scl = Math.floor(d / ord);
+ var inc, inc2, first, x, lb;
+
+ if (scl < 2) { inc = 0.1; inc2 = 0.5; }
+ else if (scl < 5) { inc = 0.2; inc2 = 1; }
+ else { inc = 0.5; inc2 = 2; }
+ inc *= ord;
+ inc2 *= ord;
+ first = (Math.floor(lo / inc) + 1) * inc;
+ for (x = 0; x < (d / inc) - 1.5; x++)
+ comb.push(first + inc * x);
+ first = (Math.floor(lo / inc2) + 1) * inc2;
+ for (x = 0; x < (d / inc2) - 1.5; x++)
+ lb.push(first + inc2 * x);
+ //dbg.innerHTML = "ord=" + ord + "<br>inc=" + inc + "<br>"
+ // + comb + "<br>" + lb;
+ return [comb, lb];
+ }
+
+ function px(x) {
+ return xzero + ((x - tmin) * tfact);
+ }
+
+ function py(y) {
+ return wh - yzero - (y * hfact);
+ }
+
+ function xaxis() {
+ ctx.beginPath();
+ ctx.moveTo(px(tmin), py(0));
+ ctx.lineTo(px(tmax), py(0));
+ ctx.strokeStyle = "black";
+ ctx.stroke();
+ }
+
+ function yaxis() {
+ var comb = getcomb(0, hmax);
var i;
- var height = [];
- var hmax = 0;
- var hfact;
- for (i = 1; i < times.length; i++) {
- height[i] = 1 / (times[i][0] - times[i-1][0]);
- if (hmax < height[i]) hmax = height[i];
+ ctx.beginPath();
+ for (i = 0; comb[0][i]; i++) {
+ ctx.moveTo(px(tmin) - 5, py(comb[0][i]));
+ ctx.lineTo(px(tmax), py(comb[0][i]));
}
- height[i+1] = height[i];
- hfact = wh / hmax;
- context.beginPath();
- context.moveTo(0, wh - height[1]*hfact);
- for (i = 1; i < times.length; i++) {
- context.lineTo((times[i][0] - tmin)*tfact,wh - height[i]*hfact);
- context.lineTo((times[i][0] - tmin)*tfact,wh - height[i+1]*hfact);
+ ctx.strokeStyle = "lightgray";
+ ctx.stroke();
+
+ ctx.beginPath();
+ ctx.moveTo(px(tmin), py(0));
+ ctx.lineTo(px(tmin), py(hmax));
+ ctx.strokeStyle = "black";
+ ctx.stroke();
+
+ ctx.fillStyle = "black";
+ ctx.font = "bold 8px Courier";
+ ctx.fillText(0, px(tmin) - 8, py(0));
+ for (i = 0; comb[1][i]; i++) {
+ ctx.fillText(comb[1][i], px(tmin) - xzero + 2, py(comb[1][i]));
+ }
+ ctx.fillText("l/h", px(tmin) + 2, py(hmax) + 8);
+ }
+
+ /* @ updates global var `hmax` */
+ function differentiate(times) {
+ var res = [];
+ var dv, dt, v;
+
+ for (i = 0; i < times.length - 1; i++) {
+ dv = times[i+1][1] - times[i][1];
+ dt = times[i+1][0] - times[i][0];
+ if (dt != 0 && dv != 0) {
+ v = (dv / dt) * 360 ; /* Litres per hour */
+ if (hmax < v) hmax = v;
+ res.push([times[i][0], v]);
+ }
+ }
+ res.push([times[i][0], v]);
+
+ return res;
+ }
+
+ function drawplot(data, color) {
+ var i;
+
+ ctx.beginPath();
+ ctx.moveTo(px(data[0][0]), py(data[0][1]));
+ for (i = 1; i < data.length; i++) {
+ ctx.lineTo(px(data[i][0]), py(data[i - 1][1]));
+ ctx.lineTo(px(data[i][0]), py(data[i][1]));
+ }
+ ctx.strokeStyle = color;
+ ctx.stroke();
+ }
+
+ function showloading() {
+ ctx.fillStyle = "green";
+ ctx.font = "bold 16px Courier";
+ ctx.fillText("loading", (ww / 2) - 40 , (wh / 2) + 8);
+ }
+
+ function clearplot() {
+ ctx.clearRect(0, 0, ww, wh);
+ }
+
+ function redraw() {
+ if (cold_d.length && hot_d.length) {
+ tfact = (ww - xzero) / (tmax - tmin);
+ hfact = (wh - yzero) / hmax;
+ clearplot();
+ xaxis();
+ yaxis();
+ drawplot(cold_d, "blue");
+ drawplot(hot_d, "red");
+ } else {
+ showloading();
}
- context.strokeStyle = color;
- context.stroke();
}
+
function gotdata(data) {
- canvas = document.getElementById("plot");
- context = canvas.getContext("2d");
- ww = canvas.width;
- wh = canvas.height;
+ document.getElementById("cold").innerHTML =
+ (data.current.cold / 100).toFixed(2);
+ document.getElementById("hot").innerHTML =
+ (data.current.hot / 100).toFixed(2);
tmin = data.range.lo;
tmax = data.range.hi;
- document.getElementById("cold").innerHTML = data.current.cold / 100;
- document.getElementById("hot").innerHTML = data.current.hot / 100;
- drawplot(data.cold, "blue");
- drawplot(data.hot, "red");
+ dbg.innerHTML = "from " + tmin + " to " + tmax
+ + "<br>from " + showdate(tmin) + " to " + showdate(tmax);
+ /* differetiate() updates hmax */
+ hmax = 0;
+ cold_d = differentiate(data.cold);
+ hot_d = differentiate(data.hot);
+ //dbg.innerHTML = "hmax=" + hmax + " hfact=" + hfact + "<br>"
+ // + cold_d + "<br>" + hot_d;
+ redraw();
+ }
+
+ function iso2qu(idate) {
+ return idate.replace("T", "+").replace("0Z", "");
+ }
+
+ function sendquery(lo, hi) {
+ var url = "query.cgi" + "?lo=" + iso2qu(lo) + "&hi=" + iso2qu(hi);
+
+ //dbg.innerHTML = url;
+ xmlhttp.onreadystatechange = function() {
+ if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
+ // dbg.innerHTML = xmlhttp.responseText;
+ var myData = JSON.parse(xmlhttp.responseText);
+ gotdata(myData);
+ }
+ }
+ xmlhttp.open("GET", url, true);
+ xmlhttp.send();
+ }
+
+ function resize() {
+ ww = window.innerWidth - 4;
+ if (ww > window.innerHeight) ww = window.innerHeight;
+ wh = ww / 2;
+ canvas.width = ww;
+ canvas.height = wh;
+ canvas.style.width = ww + "px";
+ canvas.style.height = wh + "px";
+ redraw();
+ }
+
+ function initialize() {
+ var tdy = new Date();
+ var tmr;
+
+ tdy.setMilliseconds(0);
+ tdy.setSeconds(0);
+ tdy.setMinutes(0);
+ tdy.setHours(0);
+ tmr = new Date(1*tdy + 86400000);
+ dbg = document.getElementById("debug");
+ canvas = document.getElementById("plot");
+ ctx = canvas.getContext("2d");
+ resize();
+
+ xmlhttp = new XMLHttpRequest();
+ sendquery(tdy.toISOString(), tmr.toISOString());
+ }
+
+ /* Set up */
+ if(window.attachEvent) {
+ window.attachEvent('onload', initialize);
+ window.attachEvent('onresize', resize);
+ } else {
+ window.onload = initialize;
+ window.onresize = resize;
}
</script>
<style>
clear: both;
}
div#currentvals {
- width: 14em;
+ width: 18em;
margin-left: auto;
margin-right: auto;
margin-bottom: 10px;
background-color: #ffd0e0;
}
canvas#plot {
- padding-left: 0;
- padding-right: 0;
- margin-left: auto;
- margin-right: auto;
+ padding: 0px;
+ margin: auto;
display: block;
width: 640px;
- height: 480px;
+ height: 320px;
border: solid 1px black;
}
+body {
+ margin: 0px;
+}
</style>
<title>Water Meters</title>
</head><body>
<div class="current" id="hot">hot</div>
</div>
<br />
-<canvas id="plot" width="640" height = "480"></canvas>
+<canvas id="plot" width="640" height = "320"></canvas>
<br />
<div id=debug>
</div>
-<script>
- var xmlhttp = new XMLHttpRequest();
- var url = "query.cgi";
- var qstr = "?lo=2015-12-19+00:00:00&hi=2015-12-20+00:00:00";
-
- xmlhttp.onreadystatechange = function() {
- if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
- document.getElementById("debug").innerHTML = xmlhttp.responseText;
- var myData = JSON.parse(xmlhttp.responseText);
- gotdata(myData);
- }
- }
- xmlhttp.open("GET", url+qstr, true);
- xmlhttp.send();
-</script>
</body>
projects / pulsecounter.git / blobdiff