jpgraph bar graph/array problem

[adavis]

I'm trying to dynamically create a bar graph where I am getting a set of historical data, comparing 4 groups for the past 12 months. Right now, I only have 3 months of data, but that doesn't really matter. Anyway, I have generated two "cousins" a line graph and side by side single graphs comparing each group. The error message I get is this:

One of the objects submitted to GroupBar is not a BarPlot. Make sure that you created the Group Bar plot from an array of BarPlot or AccBarPlot objects. (Class = )

This tells me I'm doing something wrong with my array. My code looks like this:

<?php

include("jpgraph/src/jpgraph.php");
include("jpgraph/src/jpgraph_bar.php");

// Create the basic graph
$graph = new Graph(750, 500,"auto");	
$graph->SetScale("textlin");
$graph->img->SetMargin(40,80,30,40);

// set color- code remove - irrelevant

// Get the data
$st = $_GET['start'];

$tg = $_GET['total_group'];
for ($i=0; $i < $tg; $i++) {
  $grup = "grp_".$i;
  $groupL[$i] = $_GET[$grup];
  $groupU[$i] = strtoupper($_GET[$grup]);
}

$tm = $_GET['total_month'];
for ($i=$st; $i < $tm; $i++) {
  $m = "m".$i;
  $mm[$i] = $_GET[$m];
  $j = $i - $st;
  $month[$j] = $_GET[$m];
}

for ($i=0; $i < $tg; $i++) {                     // total groups
  for ($m=$st; $m < $tm; $m++) {                 // total months
    $groupV = $groupL[$i]."_".$m;
    $j = $m - $st;
    $datay[$i][$j] = $_GET[$groupV];
  }
}

// Adjust the position of the legend box
$graph->legend->Pos(0.02,0.15);

// Adjust the color for theshadow of the legend - code remove - irrelevant
// Set axis titles and fonts - code remove - irrelevant

for ($i=0; $i < $tg; $i++) {                     // total groups
  $bplot[$i] = new BarPlot($datay[$i]);
  $bplot[$i]->SetFillColor($color[$i]);
  $bplot[$i]->SetLegend($groupU[$i]);        // Set the legends for the plots
}

$gbarplot = new GroupBarPlot(array($bplot));
$gbarplot->SetWidth(0.4);
$graph->Add($gbarplot);

$graph->Stroke();
?>

I figure it's something in the way I'm handling $bplot, but I'm not exactly sure what to do there. Any suggestions? Oh, btw, my input line looks like this:

<img src="all_bar.php?grp_0=mgroup&grp_1=kgroup&grp_2=jgroup&grp_3=ggroup
&mgroup_0=421&mgroup_1=385&mgroup_2=606
&kgroup_0=279&&kgroup_1=579&kgroup_2=170
&jgroup_0=272&jgroup_1=262&jgroup_2=150
&ggroup_0=409&ggroup_1=489&ggroup_2=682
&m0=Jul&m1=Aug&m2=Sep
&total_month=3&total_group=4&start=0" />

[adavis]

In the example, the GroupBarPlot line looks like this:

$gbplot = new GroupBarPlot(array($b1plot,$b2plot));

but in my code, I have $bplot in an array of indeterminate length, so how do I translate that into the correct array format? What I have right now that isn't working is:

$gbarplot = new GroupBarPlot(array($bplot));

I've also tried:

$gbarplot = new GroupBarPlot(array(array($bplot)));

which doesn't work either.

[adavis]

Okay, I've figured out what I need to do. I'm just not sure how to get there on the fly. What I need the line to look like is this:

$gbarplot = new GroupBarPlot(array($bplot[0], $bplot[1], $bplot[2]));

Where $bplot could have up to 12 elements. If I hard code this, it works. I just have to figure out how to re-create this same line on the fly... Any suggestions?

[adavis]

I took care of the the clunky way with a series of if-elseif statements...

if       ($tc == 1) {
  $gbarplot = new GroupBarPlot(array($bplot[0]));
} elseif ($tc == 2) {
  $gbarplot = new GroupBarPlot(array($bplot[0],$bplot[1]));
} elseif ($tc == 3) {
  $gbarplot = new GroupBarPlot(array($bplot[0],$bplot[1],$bplot[2]));
} ...

Clunky, but it works. I know there will be some where between 1 and 12 months worth of data so, anyway until a better solution presents it's self, this is resolved for now.

[Weedpacket]

Can you add additional datasets to an existing GroupBarPlot, or do you really have to add all of them at construction time?

[adavis]

I think I have to add them all at construction time, but I could try it the other way, you mean like in a for loop:

for ($i=0; $i < $tg; $i++) {
  $gbarplot = new GroupBarPlot(array($bplot[$i]));
}

right? It sure would be a lot "prettier" 😉

BTW, I saw the best programmer line yesterday:

There are only 10 types of people in the world, those that understand binary and those that don't.

[adavis]

I was trying to make this way too hard. It was so easy :bemused: :rolleyes: :glare: 😃

for ($i=0; $i < $tg; $i++) {                  // total groups
  $bplot[$i] = new BarPlot($datay[$i]);
  $bplot[$i]->SetFillColor($color[$i]);
  $bplot[$i]->SetLegend($groupU[$i]);
}
$gbarplot = new GroupBarPlot($bplot);