fix time interval selection

[pulsecounter.git] / web / index.html

diff --git a/web/index.html b/web/index.html
index 320921ec9d65445ddad0b42f63d7950ffba20e90..51a8da9a035400579efabe26ea7f4cd7c156c57b 100644 (file)
--- a/web/index.html
+++ b/web/index.html
@@ -13,12 +13,42 @@
   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));
@@ -26,13 +56,34 @@
     ctx.strokeStyle = "black";
     ctx.stroke();
   }
+
   function yaxis() {
+    var comb = getcomb(0, hmax);
+    var 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]));
+    }
+    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 = [];
@@ -42,7 +93,7 @@
       dv = times[i+1][1] - times[i][1];
       dt = times[i+1][0] - times[i][0];
       if (dt != 0 && dv != 0) {
-        v = dv / dt;
+        v = (dv / dt) * 360 ; /* Litres per hour */
         if (hmax < v) hmax = v;
         res.push([times[i][0], v]);
       }
@@ -51,6 +102,7 @@
 
     return res;
   }
+
   function drawplot(data, color) {
     var i;
 
@@ -63,14 +115,28 @@
     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) {
-      drawplot(cold_d, "blue");
-      drawplot(hot_d, "red");
+      tfact = (ww - xzero) / (tmax - tmin);
+      hfact = (wh - yzero) / hmax;
+      clearplot();
       xaxis();
       yaxis();
+      drawplot(cold_d, "blue");
+      drawplot(hot_d, "red");
     } else {
-      /* load animation here */ ;
+      showloading();
     }
   }
 
@@ -81,21 +147,25 @@
       (data.current.hot / 100).toFixed(2);
     tmin = data.range.lo;
     tmax = data.range.hi;
-    tfact = (ww - xzero) / (tmax - tmin);
+    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);
-    hfact = (wh - yzero) / hmax;
-    //document.getElementById("debug").innerHTML = cold_d + "<br>" + hot_d;
+    //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";
+    var url = "query.cgi" + "?lo=" + iso2qu(lo) + "&hi=" + iso2qu(hi);
 
-    if (lo && hi) url += "?lo=" + lo + "&" + hi;
-    else url = "query.cgi?lo=2015-12-19+00:00:00&hi=2015-12-20+00:00:00"; //FIX
+    //dbg.innerHTML = url;
     xmlhttp.onreadystatechange = function() {
       if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
         // dbg.innerHTML = xmlhttp.responseText;
@@ -108,7 +178,7 @@
   }
 
   function resize() {
-    ww = window.innerWidth;
+    ww = window.innerWidth - 4;
     if (ww > window.innerHeight) ww = window.innerHeight;
     wh = ww / 2;
     canvas.width = ww;
@@ -119,12 +189,21 @@
   }
 
   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");
-    xmlhttp = new XMLHttpRequest();
     resize();
-    sendquery();
+    
+    xmlhttp = new XMLHttpRequest();
+    sendquery(tdy.toISOString(), tmr.toISOString());
   }
 
   /* Set up */
@@ -144,7 +223,7 @@ br {
   clear: both;
 }
 div#currentvals {
-  width: 14em;
+  width: 18em;
   margin-left: auto;
   margin-right: auto;
   margin-bottom: 10px;