Completed the index.

app/Generator/Chart/Bill/ChartJsBillChartGenerator.php

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+<?php
+/**
+ * Created by PhpStorm.
+ * User: sander
+ * Date: 27/06/15
+ * Time: 17:21
+ */
+
+namespace FireflyIII\Generator\Chart\Bill;
+
+use FireflyIII\Models\Bill;
+use FireflyIII\Models\TransactionJournal;
+use Illuminate\Support\Collection;
+
+/**
+ * Class ChartJsBillChartGenerator
+ *
+ * @package FireflyIII\Generator\Chart\Bill
+ */
+class ChartJsBillChartGenerator implements BillChartGenerator
+{
+
+    /**
+     * @param Collection $paid
+     * @param Collection $unpaid
+     *
+     * @return array
+     */
+    public function frontpage(Collection $paid, Collection $unpaid)
+    {
+
+        // loop paid and create single entry:
+        $paidDescriptions   = [];
+        $paidAmount         = 0;
+        $unpaidDescriptions = [];
+        $unpaidAmount       = 0;
+
+
+        /** @var TransactionJournal $entry */
+        foreach ($paid as $entry) {
+
+            $paidDescriptions[] = $entry->description;
+            $paidAmount += floatval($entry->amount);
+        }
+
+        // loop unpaid:
+        /** @var Bill $entry */
+        foreach ($unpaid as $entry) {
+            $description          = $entry[0]->name . ' (' . $entry[1]->format('jS M Y') . ')';
+            $amount               = ($entry[0]->amount_max + $entry[0]->amount_min) / 2;
+            $unpaidDescriptions[] = $description;
+            $unpaidAmount += $amount;
+            unset($amount, $description);
+        }
+
+        $data = [
+            [
+                'value'     => $unpaidAmount,
+                'color'     => 'rgba(53, 124, 165,0.7)',
+                'highlight' => 'rgba(53, 124, 165,0.9)',
+                'label'     => trans('firefly.unpaid'),
+            ],
+            [
+                'value'     => $paidAmount,
+                'color'     => 'rgba(0, 141, 76, 0.7)',
+                'highlight' => 'rgba(0, 141, 76, 0.9)',
+                'label'     => trans('firefly.paid'),
+            ]
+        ];
+
+        return $data;
+    }
+
+    /**
+     * @param Bill       $bill
+     * @param Collection $entries
+     *
+     * @return array
+     */
+    public function single(Bill $bill, Collection $entries)
+    {
+    }
+}

app/Generator/Chart/Category/ChartJsCategoryChartGenerator.php

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+<?php
+
+namespace FireflyIII\Generator\Chart\Category;
+
+use Illuminate\Support\Collection;
+
+
+/**
+ * Class ChartJsCategoryChartGenerator
+ *
+ * @package FireflyIII\Generator\Chart\Category
+ */
+class ChartJsCategoryChartGenerator implements CategoryChartGenerator
+{
+
+    /**
+     * @param Collection $entries
+     *
+     * @return array
+     */
+    public function all(Collection $entries)
+    {
+    }
+
+    /**
+     * @param Collection $entries
+     *
+     * @return array
+     */
+    public function frontpage(Collection $entries)
+    {
+        $data = [
+            'count'    => 1,
+            'labels'   => [],
+            'datasets' => [
+                [
+                    'label' => 'Spent',
+                    'data'  => []
+                ]
+            ],
+        ];
+        foreach ($entries as $entry) {
+            if ($entry['sum'] != 0) {
+                $data['labels'][]              = $entry['name'];
+                $data['datasets'][0]['data'][] = round($entry['sum'],2);
+            }
+        }
+
+        return $data;
+    }
+
+    /**
+     * @param Collection $entries
+     *
+     * @return array
+     */
+    public function month(Collection $entries)
+    {
+    }
+
+    /**
+     * @param Collection $categories
+     * @param Collection $entries
+     *
+     * @return array
+     */
+    public function year(Collection $categories, Collection $entries)
+    {
+    }
+}