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m_temp.php
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m_temp.php
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<?php
$hostname = 'localhost';
$username = 'pi_select';
$password = 'xxxxxxxxxx';
try {
$dbh = new PDO("mysql:host=$hostname;dbname=measurements",
$username, $password);
/*** The SQL SELECT statement ***/
$sth = $dbh->prepare("
SELECT ROUND(AVG(`temperature`),1) AS temperature,
TIMESTAMP(CONCAT(LEFT(`dtg`,15),'0')) AS date, sensor_id
FROM `temperature`
GROUP BY `sensor_id`,`date`
ORDER BY `temperature`.`dtg` DESC
LIMIT 0,900
");
$sth->execute();
/* Fetch all of the remaining rows in the result set */
$result = $sth->fetchAll(PDO::FETCH_ASSOC);
/*** close the database connection ***/
$dbh = null;
}
catch(PDOException $e)
{
echo $e->getMessage();
}
$json_data = json_encode($result);
?>
<!DOCTYPE html>
<meta charset="utf-8">
<style> /* set the CSS */
body { font: 12px Arial;}
path {
stroke: steelblue;
stroke-width: 2;
fill: none;
}
.axis path,
.axis line {
fill: none;
stroke: grey;
stroke-width: 1;
shape-rendering: crispEdges;
}
.legend {
font-size: 16px;
font-weight: bold;
text-anchor: middle;
}
</style>
<body>
<!-- load the d3.js library -->
<script src="http://d3js.org/d3.v3.min.js"></script>
<script>
// Set the dimensions of the canvas / graph
var margin = {top: 30, right: 20, bottom: 70, left: 50},
width = 900 - margin.left - margin.right,
height = 300 - margin.top - margin.bottom;
// Parse the date / time
var parseDate = d3.time.format("%Y-%m-%d %H:%M:%S").parse;
// Set the ranges
var x = d3.time.scale().range([0, width]);
var y = d3.scale.linear().range([height, 0]);
// Define the axes
var xAxis = d3.svg.axis().scale(x)
.orient("bottom");
var yAxis = d3.svg.axis().scale(y)
.orient("left").ticks(5);
// Define the line
var temperatureline = d3.svg.line()
.x(function(d) { return x(d.date); })
.y(function(d) { return y(d.temperature); });
// Adds the svg canvas
var svg = d3.select("body")
.append("svg")
.attr("width", width + margin.left + margin.right)
.attr("height", height + margin.top + margin.bottom)
.append("g")
.attr("transform",
"translate(" + margin.left + "," + margin.top + ")");
// Get the data
<?php echo "data=".$json_data.";" ?>
data.forEach(function(d) {
d.date = parseDate(d.date);
d.temperature = +d.temperature;
});
// Scale the range of the data
x.domain(d3.extent(data, function(d) { return d.date; }));
y.domain([0, d3.max(data, function(d) { return d.temperature; })]);
// Nest the entries by sensor_id
var dataNest = d3.nest()
.key(function(d) {return d.sensor_id;})
.entries(data);
var color = d3.scale.category10(); // set the colour scale
legendSpace = width/dataNest.length; // spacing for the legend
// Loop through each sensor_id / key
dataNest.forEach(function(d,i) {
svg.append("path")
.attr("class", "line")
.style("stroke", function() { // Add the colours dynamically
return d.color = color(d.key); })
.attr("id", 'tag'+d.key.replace(/\s+/g, '')) // assign ID
.attr("d", temperatureline(d.values));
// Add the Legend
svg.append("text")
.attr("x", (legendSpace/2)+i*legendSpace) // space legend
.attr("y", height + (margin.bottom/2)+ 5)
.attr("class", "legend") // style the legend
.style("fill", function() { // Add the colours dynamically
return d.color = color(d.key); })
.on("click", function(){
// Determine if current line is visible
var active = d.active ? false : true,
newOpacity = active ? 0 : 1;
// Hide or show the elements based on the ID
d3.select("#tag"+d.key.replace(/\s+/g, ''))
.transition().duration(100)
.style("opacity", newOpacity);
// Update whether or not the elements are active
d.active = active;
})
.text(
function() {
if (d.key == '28-00043b6ef8ff') {return "Inlet";}
if (d.key == '28-00043e9049ff') {return "Ambient";}
if (d.key == '28-00043e8defff') {return "Outlet";}
else {return d.key;}
});
});
// Add the X Axis
svg.append("g")
.attr("class", "x axis")
.attr("transform", "translate(0," + height + ")")
.call(xAxis);
// Add the Y Axis
svg.append("g")
.attr("class", "y axis")
.call(yAxis);
</script>
</body>