From afc9d5a3ce941a067a66211eb4aecdc10fcf8be8 Mon Sep 17 00:00:00 2001
From: voltan <djvoltan@gmail.com>
Date: Sat, 31 Mar 2018 17:20:07 +0430
Subject: [PATCH] Add chart helper

---
 lib/Pi/View/Helper/Chart.php | 87 ++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 lib/Pi/View/Helper/Chart.php

diff --git a/lib/Pi/View/Helper/Chart.php b/lib/Pi/View/Helper/Chart.php
new file mode 100644
index 0000000000..bec0c6ff3a
--- /dev/null
+++ b/lib/Pi/View/Helper/Chart.php
@@ -0,0 +1,87 @@
+<?php
+/**
+ * Pi Engine (http://piengine.org)
+ *
+ * @link            http://code.piengine.org for the Pi Engine source repository
+ * @copyright       Copyright (c) Pi Engine http://piengine.org
+ * @license         http://piengine.org/license.txt BSD 3-Clause License
+ * @package         View
+ */
+
+namespace Pi\View\Helper;
+
+use Pi;
+use Zend\View\Helper\AbstractHelper;
+
+/**
+ * Helper for draw charts
+ *
+ * $this->chart($type, $data, $options, $htmlClass);
+ *
+ * @see http://www.chartjs.org
+ * @author Hossein Azizabadi <djvoltan@gmail.com>
+ */
+class Chart extends AbstractHelper
+{
+    /**
+     * Load chart script
+     *
+     * @param   string $type
+     * @param   array $data
+     * @param   array $options
+     * @param   string $htmlClass
+     *
+     * @return  $this
+     */
+    public function __invoke($type, $data, $options = [], $htmlClass = 'pi-chart')
+    {
+        // Set uniqid
+        $id = uniqid('piChart');
+
+        // Sat data and option
+        $pattern     = '/"([a-zA-Z]+[a-zA-Z0-9_]*)":/';
+        $replacement = '$1:';
+        $data        = preg_replace($pattern, $replacement, json_encode($data));
+        $options     = empty($options) ? '{}' : preg_replace($pattern, $replacement, json_encode($options));
+
+        // Set script
+        $script
+                = <<<'EOT'
+(function ($) {
+    $(document).ready(function () {
+        var ctx = document.getElementById('%s').getContext('2d');
+        var %s = new Chart(ctx, {
+            type: '%s',
+            data: %s,
+            options: %s
+        });
+    });
+})(jQuery)
+EOT;
+        $script = sprintf(
+            $script,
+            $id,
+            $id,
+            $type,
+            $data,
+            $options
+        );
+
+        // Load chart
+        $this->view->jQuery();
+        $this->view->js(pi::url('static/vendor/chart/Chart.min.js'));
+        $this->view->footScript()->appendScript($script);
+
+        // render html
+        $htmlTemplate
+            = <<<'EOT'
+<div class="pi-chart-section">
+    <canvas id="%s" class="%s"></canvas>
+</div>
+EOT;
+
+        $content = sprintf($htmlTemplate, $id, $htmlClass);
+
+        return $content;
+    }
+}
\ No newline at end of file