I'm getting started with the Highcharts JS library and I'm having some trouble with starting my chart at a specific date and time. The chart is a stream gage chart so my X values are a date/time (in EPOCH format) and the y values are a gage height.
I want my chart to cover 3 days starting at midnight, 2 days prior to today's date. I'm trying to use 'pointStart' to establish the beginning of my chart's x values but it's not quite working. I'm getting my three day timespan but the starting point isn't the desired midnight.
What am I doing wrong? Here's my full highcharts code:
$(function () {
$('#gChart').highcharts({
chart: {
type: 'spline',
margin: [20,40,50,60]
},
legend: {
enabled: false
},
title: {
text: null
},
xAxis: {
title: {
text: 'Date',
style: {
color: 'black',
fontWeight: 'bold'
}
},
type: 'datetime',
gridLineWidth: 1,
lineWidth: 1,
lineColor: 'black',
labels: {
formatter: function () {
var curVal = this.value;
var dt = new Date();
theDate = new Date(eval(eval(curVal + 28800) * 1000));
if (theDate.toString('h tt') == "0 AM") {
var t = theDate.toString('M/d/yyyy');
} else {
var t = theDate.toString('htt');
}
return t;
},
style: {
color: 'black'
}
},
startOnTick: true,
endOnTick: true,
gridLineColor: '#222',
tickInterval: 86400,
minRange: 259200,
minorGridLineColor: 'red',
startOnTick: true,
plotlines: [{
color: 'black',
label: {
text: 'Last Update',
align: 'Right',
style: {
color: 'black',
fontWeight: 'bold',
}
},
value: theData[theData.length-1].x,
width: 1
}]
},
yAxis: {
title: {
text: 'Stage (Ft)',
style: {
color: 'black',
fontWeight: 'bold'
}
},
lineWidth: 1,
lineColor: 'black',
min: chartProps["lowGraph"],
max: chartProps["highGraph"],
minorGridLineWidth: 0,
gridLineWidth: 1,
alternateGridColor: null,
startOnTick: true,
plotLines: [{ // Flood Stage 2
value: chartProps["floodPhase2"],
dashStyle: 'Dash',
color: '#FFDC14', //Yellow
width: '4',
label: {
text: 'FLOOD STAGE 2',
align: 'center',
style: {
color: '#FFDC14', //Yelow
fontWeight: 'bold',
fontSize: '10pt'
}
}
}, { // Flood Stage 3
value: chartProps["floodPhase3"],
dashStyle: 'Dash',
color: '#FFA500',
width: '4',
label: {
text: 'FLOOD STAGE 3',
align: 'center',
style: {
color: '#FFA500',
fontWeight: 'bold',
fontSize: '10pt'
}
}
}, { // Flood Stage 4
value: chartProps["floodPhase4"],
dashStyle: 'Dash',
color: 'red',
width: '4',
label: {
text: 'FLOOD STAGE 4',
align: 'center',
style: {
color: 'red',
fontWeight: 'bold',
fontSize: '10pt'
}
}
}]
},
tooltip: {
valueSuffix: ' ft',
formatter: function() {
var curVal = this.x;
var dt = new Date();
theDate = new Date(eval(eval(curVal + 28800) * 1000));
var d = theDate.toString('M/d/yyyy');
if (theDate.toString('h') == "0") {
var t = "12:" + theDate.toString('mm tt');
} else {
var t = theDate.toString('h:mm tt');
}
theString = d + ' @ ' + t + '<br><b>Gage Height: ' + this.y + ' Ft</b>';
return theString;
}
},
plotOptions: {
spline: {
lineWidth: 2,
states: {
hover: {
lineWidth: 2
}
},
marker: {
enabled: false
},
pointInterval: 900, // 5 minutes
pointStart: new Date(new Date().getFullYear(), new Date().getMonth(), new Date().getDate()-2,0,0,0,0)
}
},
series: [{
name: 'Gage Height',
data: theData
}]
,
navigation: {
menuItemStyle: {
fontSize: '10px'
}
}
});
});
