SVGGraph Bar Graphs

« Return to SVGGraph page

SVGGraph currently contains these classes for drawing bar graphs: BarGraph; Bar3DGraph; StackedBarGraph; GroupedBarGraph. An example of each type is shown below.

Example code

Here are the settings and PHP code used to generate the graphs above:

require_once('includes/SVGGraph.php');
 
$settings = array(
  'back_colour' => '#eee',  'stroke_colour' => '#000',
  'back_stroke_width' => 0, 'back_stroke_colour' => '#eee',
  'back_image' => 'images/svgbg.png',
  'axis_colour' => '#333',  'axis_overlap' => 2,
  'axis_font' => 'Georgia', 'axis_font_size' => 10,
  'grid_colour' => '#666',  'label_colour' => '#000',
  'pad_right' => 20,        'pad_left' => 20,
  'link_base' => '/',       'link_target' => '_top',
  'project_angle' => 45,    'minimum_grid_spacing' => 20
);
 
$values = array(
 array('Dough' => 30, 'Ray' => 50, 'Me' => 40, 'So' => 25, 'Far' => 45, 'Lard' => 35),
 array('Dough' => 20, 'Ray' => 30, 'Me' => 20, 'So' => 15, 'Far' => 25, 'Lard' => 35,
  'Tea' => 45)
);
 
$colours = array(array('red','yellow'), array('blue','white'));
$links = array('Dough' => 'jpegsaver.php', 'Ray' => 'crcdropper.php',
  'Me' => 'svggraph.php');
 
$graph = new SVGGraph(300, 200, $settings);
$graph->colours = $colours;
 
$graph->Values($values);
$graph->Links($links);
$graph->Render('BarGraph');

This is not the actual code used - I have adapted it to make it easier to copy and paste it into a new file to try for yourself. To change the type of graph generated, change 'BarGraph' in the final call to $graph->Render to one of the other types.

The StackedBarGraph example uses a different set of colours:

$colours = array(
 array('red','yellow','red','h'),
 array('blue','cyan','blue','h')
);

The final 'h' in the array of colours tells SVGGraph to create a horizontal gradient.

Settings

These options are common to all graph types:

The following table lists the other options relevant to the bar graph types - many of these options are also used by the line and scatter graphs:

• ^[1]For GroupedBarGraph, bar_space is the space between groups of bars
• ^[2]Only used for GroupedBarGraph
• ^[3]Only used for Bar3dGraph
• ^[4]The grid_enclose_* options are deprecated from version 2.2 - SVGGraph will always attempt to fit the graph within the grid
• ^[5]These options override SVGGraph's calculations for axis start, end and division values. See the axis and grid options page for more details.
• ^[6]The axis labelling options were added in version 2.6. For details, see the titles, labels and legends page.

« Back to top of page Horizontal bar graphs »

Copyright © 2011, Goat 1000