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  Display volume on a seperate access
Posted by icasper on Feb-15-2012 19:06
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I amusing the follownig php code for finance chart, but the volume is not coming as a
seperate axis. i.e. i want volume to be just below prices line, but on a seperate access.

# Create a finance chart demo containing 100 days of data
$noOfDays = 100;

# To compute moving averages starting from the first day, we need to get extra data
# points before the first day
$extraDays = 30;

# In this exammple, we use a random number generator utility to simulate the data. We
# set up the random table to create 6 cols x (noOfDays + extraDays) rows, using 9 as
# the seed.
$rantable = new RanTable(9, 6, $noOfDays + $extraDays);

# Set the 1st col to be the timeStamp, starting from Sep 4, 2002, with each row
# representing one day, and counting week days only (jump over Sat and Sun)
$rantable->setDateCol(0, chartTime(2002, 9, 4), 86400, true);

# Set the 2nd, 3rd, 4th and 5th columns to be high, low, open and close data. The
# open value starts from 100, and the daily change is random from -5 to 5.
$rantable->setHLOCCols(1, 100, -5, 5);

# Set the 6th column as the vol data from 5 to 25 million
$rantable->setCol(5, 50000000, 250000000);

# Now we read the data from the table into arrays
$timeStamps = $rantable->getCol(0);
$highData = $rantable->getCol(1);
$lowData = $rantable->getCol(2);
$openData = $rantable->getCol(3);
$closeData = $rantable->getCol(4);
$volData = $rantable->getCol(5);

# Create a FinanceChart object of width 600 pixels
$c = new FinanceChart(600);

# Add a title to the chart
$c->addTitle("Finance Chart Demonstration");

# Set the data into the finance chart object
$c->setData($timeStamps, $highData, $lowData, $openData, $closeData, $volData,
    $extraDays);

# Add the main chart with 210 pixels in height
$c->addMainChart(210);

# Add a 10 period simple moving average to the main chart, using brown color
$c->addSimpleMovingAvg(50, 0x663300);

# Add a 20 period simple moving average to the main chart, using purple color
$c->addSimpleMovingAvg(200, 0x9900ff);

# Add an HLOC symbols to the main chart, using green/red for up/down days
$c->addCloseLine(0x000040);
//$c->addCandleStick(0x00ff00, 0xff0000);

# Add a 70 pixels volume bars sub-chart to the bottom of the main chart, using
# green/red/grey for up/down/flat days
$vol_layer = $c->addVolBars(70, 0x99ff99, 0xff9999, 0x808080);
$vol_layer->setUseYAxis2();


# output the chart
header("Content-type: image/png");
print($c->makeChart2(PNG));

Can u assist. I used setUseYAxis2() already.

Thanks

  Re: Display volume on a seperate access
Posted by Peter Kwan on Feb-16-2012 01:17
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Hi icasper,

I tried your code with ChartDirector Ver 5. I found that the volume bars are under the line, and it is using a separate axis. (The volume is using the left axis, while the line is using the right axis.)

You mentioned that you want the volume to be on a separate "access". Do you mean you want the volume to be on a separate chart like a technical indicator? To do this, please use addVolIndicator instead of addVolBars. There should be no need to use setUseYAxis2.

Hope this can help.

Regards
Peter Kwan