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  Draw spline chart through selected points of time series
Posted by mike Gibbons on Sep-04-2015 05:59
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Hi Peter,

So if I have a time series of stock prices and I wanted to draw a curve through just 3 points in the series, how would I do that. (see example).

Regards,

Mike Gibbons
spline.png

  Re: Draw spline chart through selected points of time series
Posted by Peter Kwan on Sep-05-2015 03:26
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Hi Mike,

You can add a spline layer with a data series that just contain 3 points (with all other
points being NoValue). For example:

# Add the main chart with 240 pixels in height
$mainChart = $c->addMainChart(240);

# An array with all points being NoValue except 3 points
$myData = array_pad(array(), count($timeStamps), NoValue);
$myData[40] = $closeData[40];
$myData[60] = $closeData[60];
$myData[80] = $closeData[80];

# Add a spline layer
$mainChart->addSplineLayer($myData, 0x0000ff);

Hope this can help.

Regards
Peter Kwan