Ok. Here's one way to do it:
var data = new google.visualization.DataTable();
// create columns and populate data
var average = /* input or calculate your average */;
var view = new google.visualization.DataView(data);
view.setColumns([0, 1, {
type: 'number',
calc: function (dt, row) {
return (dt.getValue(row, 1) < average) ? {v: dt.getValue(row, 1),
f: dt.getFormattedValue(row, 1)} : null;
}
}]);
var chart = new google.visualization.LineChart(...);
chart.draw(view, {
/* options */
series: {
0: {
pointSize: 3 // pick some size that works for you, should be
the same for both for best visual continuity
}
1: {
visibleInLegend: false,
pointSize: 3, // pick some size that works for you, should be
the same for both for best visual continuity
lineWidth: 0
}
}
});
On Friday, July 5, 2013 10:56:37 AM UTC-4, Stef Marais wrote:
>
> I just want the point to change color for certain behavior. For instance
> if the price drops below the average, that point must by hi-lighted or made
> a different colour. The line should stay the same color throughout
>
> On Friday, July 5, 2013 7:32:00 AM UTC-7, asgallant wrote:
>>
>> Do you want just the points to change color or do you want the line to
>> change color too? If you want the line to change color, what behavior do
>> you want when the line crosses (one point is above and the other below) the
>> average?
>>
>> On Friday, July 5, 2013 5:24:04 AM UTC-4, Stef Marais wrote:
>>>
>>> I'm new to PHP. I have managed to plot my data, the price at varying
>>> dates, using the line chart. I would like to plot points in different
>>> colours when the price dips below the average.
>>>
>>> How can I go about doing this?
>>>
>>
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