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index.html
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<!doctype html>
<html lang="en">
<head>
<script src="https://d3js.org/d3.v5.min.js"></script>
</head>
<body>
<div>
<h1>Greenhouse</h1>
</div>
<div>
<img src="currentDisplay.png" />
</div>
<button onclick="drawGraph('temp','red')" style="background-color: red;">temp</button>
<button onclick="drawGraph('humid','steelblue')" style="background-color: steelblue;">humid</button>
<button onclick="drawGraph('press','orange')" style="background-color: orange;">press</button>
<button onclick="drawGraph('lux','violet')" style="background-color: violet;">lux</button>
<button onclick="drawGraph('batt','green')" style="background-color: green;">batt</button>
<button onclick="drawGraph('wifi','blue')" style="background-color: blue;">wifi</button>
<div id="my_dataviz"></div>
<script>
var origData=[];
function getGreenHouseData(url,callback){
if(origData.length>0)callback();
else d3.json("GreenHouseData.json").then(d=>{
console.log("read file");
origData=d;
callback();
});
}
function drawGraph(fieldname,color){
// set the dimensions and margins of the graph
var margin = { top: 10, right: 30, bottom: 30, left: 60 },
width = 460 - margin.left - margin.right,
height = 400 - margin.top - margin.bottom;
// append the svg object to the body of the page
var svg = d3.select("#my_dataviz")
.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 + ")");
//Read the data
getGreenHouseData("GreenHouseData.json", function(){
let data = [];
origData.forEach(function(d){data.push({ date: d3.timeParse("%I:%M%p %b %d, %Y")(d.time), value: d[fieldname] })});
// Now I can use this dataset:
//console.log(data[0]);
// Add X axis --> it is a date format
var x = d3.scaleTime()
.domain(d3.extent(data, function (d) { return d.date; }))
.range([0, width]);
svg.append("g")
.attr("transform", "translate(0," + height + ")")
.call(d3.axisBottom(x));
// Add Y axis
var y = d3.scaleLinear()
.domain([d3.min(data, function (d) { return +d.value; }), d3.max(data, function (d) { return +d.value; })])
.range([height, 0]);
svg.append("g")
.call(d3.axisLeft(y));
// Add the line
svg.append("path")
.datum(data)
.attr("fill", "none")
.attr("stroke", color)
.attr("stroke-width", 1.5)
.attr("d", d3.line()
.x(function (d) { return x(d.date) })
.y(function (d) { return y(d.value) })
);
svg.append('text')
.attr('y', margin.top)
.attr('x', margin.left)
.attr('dy', '1.5em') // 1em equals exactly one unit of the currently specified text point size.
.style("text-anchor", 'middle')
.text(fieldname);
});
}
</script>
</body>
</html>