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  box whisker layer hidden behind overlapping bar issue
Posted by Martin Gross on Oct-18-2014 00:17
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Hi Peter,

I have a simple overlapping bar set up with two whisker layers. I can see the ends of the
whisker marks, as they are wider then the overlapping bar, but the overlapping bar covers
the whisker's middle. I have tried ordering the sequence of bar vs whisker layer to no
avail.

Do you have any thoughts on this?

Thank you so much for your time.

Martin Gross

  Re: box whisker layer hidden behind overlapping bar issue
Posted by Peter Kwan on Oct-18-2014 04:04
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Hi Martin,

If you want the box-whisker layer to stay in front of the bar layer, you may add the box-
whisker layer first, followed by the bar layer. For example:

use perlchartdir;

# Sample data for the Box-Whisker chart. Represents the minimum, 1st quartile,
# medium, 3rd quartile and maximum values of some quantities
my $Q0Data = [40, 45, 40, 30, 20, 50, 25, 44];
my $Q2Data = [62, 70, 60, 50, 48, 70, 62, 70];
my $Q4Data = [80, 90, 75, 70, 60, 85, 80, 84];

# The labels for the chart
my $labels = ["Group A", "Group B", "Group C", "Group D", "Group E", "Group F",
    "Group G", "Group H"];

# Create a XYChart object of size 550 x 250 pixels
my $c = new XYChart(550, 250);

# Set the plotarea at (50, 25) and of size 450 x 200 pixels. Enable both horizontal
# and vertical grids by setting their colors to grey (0xc0c0c0)
$c->setPlotArea(50, 25, 450, 200)->setGridColor(0xc0c0c0, 0xc0c0c0);

# Add a title to the chart
$c->addTitle("Computer Vision Test Scores");

# Set the labels on the x axis and the font to Arial Bold
$c->xAxis()->setLabels($labels)->setFontStyle("arialbd.ttf");

# Set the font for the y axis labels to Arial Bold
$c->yAxis()->setLabelStyle("arialbd.ttf");

# Add a Box Whisker layer first
$c->addBoxWhiskerLayer([], [], $Q4Data, $Q0Data, [], 0x9999ff, 0x0000ff)-
>setLineWidth(2);

# Follow by a bar layer
$c->addBarLayer($Q2Data, 0x00aa00);

$c->makeChart("test.png");

Hope this can help.

Regards
Peter Kwan
boxwhisker.png