public function get_main_chart() {
		global $wp_locale;

		$customer_orders = $this->get_order_report_data(
			array(
				'data'         => array(
					'ID'        => array(
						'type'     => 'post_data',
						'function' => 'COUNT',
						'name'     => 'total_orders',
					),
					'post_date' => array(
						'type'     => 'post_data',
						'function' => '',
						'name'     => 'post_date',
					),
				),
				'where_meta'   => array(
					array(
						'meta_key'   => '_customer_user',
						'meta_value' => '0',
						'operator'   => '>',
					),
				),
				'group_by'     => $this->group_by_query,
				'order_by'     => 'post_date ASC',
				'query_type'   => 'get_results',
				'filter_range' => true,
			)
		);

		$guest_orders = $this->get_order_report_data(
			array(
				'data'         => array(
					'ID'        => array(
						'type'     => 'post_data',
						'function' => 'COUNT',
						'name'     => 'total_orders',
					),
					'post_date' => array(
						'type'     => 'post_data',
						'function' => '',
						'name'     => 'post_date',
					),
				),
				'where_meta'   => array(
					array(
						'meta_key'   => '_customer_user',
						'meta_value' => '0',
						'operator'   => '=',
					),
				),
				'group_by'     => $this->group_by_query,
				'order_by'     => 'post_date ASC',
				'query_type'   => 'get_results',
				'filter_range' => true,
			)
		);

		$signups         = $this->prepare_chart_data( $this->customers, 'user_registered', '', $this->chart_interval, $this->start_date, $this->chart_groupby );
		$customer_orders = $this->prepare_chart_data( $customer_orders, 'post_date', 'total_orders', $this->chart_interval, $this->start_date, $this->chart_groupby );
		$guest_orders    = $this->prepare_chart_data( $guest_orders, 'post_date', 'total_orders', $this->chart_interval, $this->start_date, $this->chart_groupby );

		$chart_data = wp_json_encode(
			array(
				'signups'         => array_values( $signups ),
				'customer_orders' => array_values( $customer_orders ),
				'guest_orders'    => array_values( $guest_orders ),
			)
		);
		?>
		<div class="chart-container">
			<div class="chart-placeholder main"></div>
		</div>
		<script type="text/javascript">
			var main_chart;

			jQuery(function(){
				var chart_data = JSON.parse( decodeURIComponent( '<?php echo rawurlencode( $chart_data ); ?>' ) );

				var drawGraph = function( highlight ) {
					var series = [
							{
								label: "<?php echo esc_js( __( 'Customer orders', 'woocommerce' ) ); ?>",
								data: chart_data.customer_orders,
								color: '<?php echo esc_html( $this->chart_colours['customers'] ); ?>',
								bars: { fillColor: '<?php echo esc_html( $this->chart_colours['customers'] ); ?>', fill: true, show: true, lineWidth: 0, barWidth: <?php echo esc_html( $this->barwidth ); ?> * 0.5, align: 'center' },
								shadowSize: 0,
								enable_tooltip: true,
								append_tooltip: "<?php echo esc_html( ' ' . __( 'customer orders', 'woocommerce' ) ); ?>",
								stack: true,
							},
							{
								label: "<?php echo esc_js( __( 'Guest orders', 'woocommerce' ) ); ?>",
								data: chart_data.guest_orders,
								color: '<?php echo esc_html( $this->chart_colours['guests'] ); ?>',
								bars: { fillColor: '<?php echo esc_html( $this->chart_colours['guests'] ); ?>', fill: true, show: true, lineWidth: 0, barWidth: <?php echo esc_html( $this->barwidth ); ?> * 0.5, align: 'center' },
								shadowSize: 0,
								enable_tooltip: true,
								append_tooltip: "<?php echo esc_html( ' ' . __( 'guest orders', 'woocommerce' ) ); ?>",
								stack: true,
							},
							{
								label: "<?php echo esc_js( __( 'Signups', 'woocommerce' ) ); ?>",
								data: chart_data.signups,
								color: '<?php echo esc_html( $this->chart_colours['signups'] ); ?>',
								points: { show: true, radius: 5, lineWidth: 3, fillColor: '#fff', fill: true },
								lines: { show: true, lineWidth: 4, fill: false },
								shadowSize: 0,
								enable_tooltip: true,
								append_tooltip: "<?php echo esc_html( ' ' . __( 'new users', 'woocommerce' ) ); ?>",
								stack: false
							},
						];

					if ( highlight !== 'undefined' && series[ highlight ] ) {
						highlight_series = series[ highlight ];

						highlight_series.color = '#9c5d90';

						if ( highlight_series.bars )
							highlight_series.bars.fillColor = '#9c5d90';

						if ( highlight_series.lines ) {
							highlight_series.lines.lineWidth = 5;
						}
					}

					main_chart = jQuery.plot(
						jQuery('.chart-placeholder.main'),
						series,
						{
							legend: {
								show: false
							},
							grid: {
								color: '#aaa',
								borderColor: 'transparent',
								borderWidth: 0,
								hoverable: true
							},
							xaxes: [ {
								color: '#aaa',
								position: "bottom",
								tickColor: 'transparent',
								mode: "time",
								timeformat: "<?php echo ( 'day' === $this->chart_groupby ) ? '%d %b' : '%b'; ?>",
								monthNames: JSON.parse( decodeURIComponent( '<?php echo rawurlencode( wp_json_encode( array_values( $wp_locale->month_abbrev ) ) ); ?>' ) ),
								tickLength: 1,
								minTickSize: [1, "<?php echo esc_html( $this->chart_groupby ); ?>"],
								tickSize: [1, "<?php echo esc_html( $this->chart_groupby ); ?>"],
								font: {
									color: "#aaa"
								}
							} ],
							yaxes: [
								{
									min: 0,
									minTickSize: 1,
									tickDecimals: 0,
									color: '#ecf0f1',
									font: { color: "#aaa" }
								}
							],
						}
					);
					jQuery('.chart-placeholder').resize();
				}

				drawGraph();

				jQuery('.highlight_series').hover(
					function() {
						drawGraph( jQuery(this).data('series') );
					},
					function() {
						drawGraph();
					}
				);
			});
		</script>
		<?php
	}