To understand how themes are used, it is easiest to look at the sample code. For example, the Aqua Theme can be applied using the following.

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<?php
$theme_class = new AquaTheme();
$graph->SetTheme($theme_class);
?>

In line 1, an instance of AquaTheme class is created, and the graph theme is changed by passing the instance to SetTheme(). To use 'GreenTheme' instead of 'AquaTheme', use the following.

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$theme_class = new GreenTheme;

All theme classes inherit the abstract 'Theme' class.

Figure 28.1. Aqua Theme (aqua_example.php)

Figure 28.2. Green Theme (green_example.php)

Figure 28.3. Ocean Theme (ocean_example.php)

Figure 28.4. Pastel Theme (pastel_example.php)

Figure 28.5. Softy Theme (softy_example.php)

Figure 28.6. Vivid Theme (vivid_example.php)

Figure 28.7. Orange Theme (orange_example.php)

Figure 28.8. Rose Theme (rose_example.php)

Figure 28.9. Universal Theme (universal_example.php)