Add getColorPalette() to ChamiloApi to return common array of colors

main/inc/ajax/statistics.ajax.php

@@ -8,6 +8,8 @@ use Chamilo\CoreBundle\Component\Utils\ChamiloApi;
  */
 require_once __DIR__.'/../global.inc.php';
 
+use Chamilo\CoreBundle\Component\Utils\ChamiloApi;
+
 api_protect_admin_script();
 
 $action = isset($_REQUEST['a']) ? $_REQUEST['a'] : null;

src/CoreBundle/Component/Utils/ChamiloApi.php

@@ -289,4 +289,33 @@ class ChamiloApi
 
         return api_get_path(WEB_CSS_PATH).'editor_content.css';
     }
+    /**
+     * Get a list of colors from the palette at main/palette/pchart/default.color
+     * and return it as an array of strings
+     * @param bool $decimalOpacity Whether to return the opacity as 0..100 or 0..1
+     * @param bool $wrapInRGBA Whether to return it as 1,1,1,100 or rgba(1,1,1,100)
+     * @return array An array of string colors
+     */
+    public static function getColorPalette($decimalOpacity = false, $wrapInRGBA = false)
+    {
+        // Get the common colors from the palette used for pchart
+        $paletteFile = api_get_path(SYS_CODE_PATH).'palettes/pchart/default.color';
+        $palette = file($paletteFile);
+        if ($decimalOpacity) {
+            // Because the pchart palette has transparency as integer values
+            // (0..100) and chartjs uses percentage (0.0..1.0), we need to divide
+            // the last value by 100, which is a bit overboard for just one chart
+            foreach ($palette as $index => $color) {
+                $components = preg_split('/,/', trim($color));
+                $components[3] = round($components[3] / 100, 1);
+                $palette[$index] = join(',', $components);
+            }
+        }
+        if ($wrapInRGBA) {
+            foreach ($palette as $index => $color) {
+                $palette[$index] = 'rgba('.$palette[$index].')';
+            }
+        }
+        return $palette;
+    }
 }