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This method can be used to gently change your older GD::Graph programs over to GD::Graph::Data objects, instead of the arrays of array references.
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The GD::Graph::Data module can do much more with your data set, and I suggest you have a look at its documentation. See the DBI documentation for a unified interface to all kinds of databases.
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Almost all the options and settings for GD::Graph objects are passed in through the set() method, and can be queried with the get() method. There are many options for the various GD::Graph modules, and I suggest you read through the documentation to find out about them. I ll illustrate a few key choices in the following sections, but I won t duplicate the complete explanation of each single option here. The text would probably grow stale faster than a piece of brie.
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There are several textual elements in a GD::Graph object. Each of these objects has a font associated with it, which can be accessed through the appropriate method. GD::Graph supports fonts through the use of GD::Text::Align objects (see section 11.3.1, The GD::Text modules, on page 207) from the GDTextUtils package, which means that it will support whatever your current version of GD supports. The objects that can be set, and the corresponding methods, are shown in table 5.1.
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Table 5.1 The font handling methods for GD::Graph. All of these methods accept either a built-in GD font, or the name of a TrueType font file. Charts with axes title X axis label Y axis labels X axis values Y axis values legend text Pie charts title label under the pie values on the pie set_title_font() set_label_font() set_value_font() set_title_font() set_x_label_font() set_y_label_font() set_x_axis_font() set_y_axis_font() set_legend_font()
Each of these methods accepts either a built-in GD font, or the name of a TrueType font file, and a size. If you want to use GD built-in fonts, you will have to import the GD module as well. GD::GRAPH AND FRIENDS 65
use GD; $chart->set_title_font('/fonts/arial.ttf', 18); $chart->set_legend_font(gdTinyFont); $chart->set_y_label_font(GD::Font->Giant);
Since the GD::Graph font handling gets delegated to a GD::Text::Align object, you can use all the fancy features that come with that module. So, supposing you have set your FONT_PATH environment variable correctly to point to your TrueType font files, you can do something such as this:
$chart->set_title_font(['verdana', 'arial', gdMediumBoldFont], 14);
This will first look in your font path for the file verdana.ttf, and if it is not found, it will look for arial.ttf, and as a last resort it will fall back on a built-in GD font.6 This allows you to write code that creates charts which come out looking as pleasing as possible, given the system on which the program runs. For more information see section 11.3.1, The GD::Text modules, on page 207, and the GD::Text documentation. 5.1.4
Saving your chart to a file
GD::Graph does not provide any method to save an image, or to get image data to save. The plot() method instead returns a reference to a GD::Image object and leaves it up to the user to save the image data to a file. Alternatively, the gd() method can be used to get that same reference, any time after plot() has been called. Once that is accomplished, the GD::Image png()7 method can be called to save the image.
$chart->plot(\@data); my $gd_object = $chart->gd; # or directly: # my $gd_object = $chart->plot(\@data); open(IMAGE, '>image.png') or die "open >image.png: $!"; binmode IMAGE; print IMAGE $gd_object->png; close IMAGE;
In version 1.20, GD dropped support for GIF output, and started writing PNG instead. Thus, if you write code that needs to save output from these modules, you run the risk of ending up on a platform where the version of GD provides unanticipated output methods. Since this can result in unwelcome runtime error messages, it is better to try to prevent it from happening. One possible approach is to check which version is available, and exit if it s the wrong one. A more forgiving strategy is to always output something, using the correct calls. This strategy can be especially
Of course the size parameter will not influence the size of the built-in font. ... or any one of the other methods that return image data: jpeg(), wbmp(), gd(), gd2(), or in the case of older versions, the gif() method. Which ones are available depends on your particular version of GD.
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