Some extended code for the category report.

app/Generator/Chart/Category/CategoryChartGeneratorInterface.php

@@ -23,6 +23,13 @@ use Illuminate\Support\Collection;
 interface CategoryChartGeneratorInterface
 {
 
+    /**
+     * @param array $data
+     *
+     * @return array
+     */
+    public function pieChart(array $data): array;
+
     /**
      * @param Collection $entries
      *

app/Generator/Chart/Category/ChartJsCategoryChartGenerator.php

@@ -12,6 +12,7 @@
 declare(strict_types = 1);
 namespace FireflyIII\Generator\Chart\Category;
 
+use FireflyIII\Support\ChartColour;
 use Illuminate\Support\Collection;
 
 
@@ -117,6 +118,30 @@ class ChartJsCategoryChartGenerator implements CategoryChartGeneratorInterface
         return $data;
     }
 
+    /**
+     * @param array $entries
+     *
+     * @return array
+     */
+    public function pieChart(array $entries): array
+    {
+        $data  = [
+            'datasets' => [
+                0 => [],
+            ],
+            'labels'   => [],
+        ];
+        $index = 0;
+        foreach ($entries as $entry) {
+            $data['datasets'][0]['data'][]            = round($entry['amount'], 2);
+            $data['datasets'][0]['backgroundColor'][] = ChartColour::getColour($index);
+            $data['labels'][]                         = $entry['name'];
+            $index++;
+        }
+
+        return $data;
+    }
+
     /**
      *
      * @param Collection $entries