Google API : gauge animation
I am trying to make google gauge pointer move, but it is not moving, I have set animation configuration as it suppose to be set in var options , such as duration : 1000 and easing: 'inAndOut' , I am n00b in Google API so for give my ignorance attempt.
can anyone help me. here is the tutorial link that I am using it. the code is working but partially, the gauge pointer should move slowly to it's max, however, in my case it wont work. here is the code.
<html>
<script type='text/javascript' src='https://www.google.com/jsapi'></script>
<script type='text/javascript'>
google.load('visualization', '1', {packages:['gauge']});
google.setOnLoadCallback(drawChart);
function drawChart() {
var data = google.visualization.arrayToDataTable([
['Label', 'Value'],
['Match',80],
]);
var options = {
width: 440, height: 140,
greenFrom: 70, greenTo: 100,
yellowFrom:50, yellowTo: 70,
redFrom:0, redTo: 50,
minorTicks: 5,
animation:{
duration: 1000,
easing: 'inAndOut',
},
majorTicks : ['0','10','20','30','40','50','60','70','80','90','100']
};
var chart = new google.visualization.Gauge(document.getElementById('chart_div<%=id%>'));
chart.draw(data, options);
clearChart();
}
</script>
</html>
Answer
Turns out I figured this one out myself, there's a nice answer in a google forums here
The trick is to start the gauge off with a 0 (or whatever your minimum) value is and then update the value later (using setInterval() or any other method)
There's definitely better ways of updating the value instead of just writing a new array but you get the idea.
<html>
<script type='text/javascript' src='https://www.google.com/jsapi'></script>
<script type='text/javascript'>
google.load('visualization', '1', {packages:['gauge']});
google.setOnLoadCallback(drawChart);
function drawChart() {
var data = google.visualization.arrayToDataTable([
['Label', 'Value'],
['Match',0],
]);
var options = {
width: 440, height: 140,
greenFrom: 70, greenTo: 100,
yellowFrom:50, yellowTo: 70,
redFrom:0, redTo: 50,
minorTicks: 5,
animation:{
duration: 1000,
easing: 'inAndOut',
},
majorTicks : ['0','10','20','30','40','50','60','70','80','90','100']
};
var chart = new google.visualization.Gauge(document.getElementById('chart_div<%=id%>'));
chart.draw(data, options);
clearChart();
// This is new.
setTimeout(function(){
var data = google.visualization.arrayToDataTable([
['Label', 'Value'],
['Match',80],
]);
chart.draw(data, options);
}, 200);
}
</script>
</html>