$chartCenterY works here

Created using FusionCharts Suite XT - www.fusioncharts.com

by Nabajeet Sonowal

HTML

<script src="http://static.fusioncharts.com/code/latest/fusioncharts.js"></script>
<script src="http://static.fusioncharts.com/code/latest/fusioncharts.charts.js"></script>
<script src="http://static.fusioncharts.com/code/latest/themes/fusioncharts.theme.fint.js"></script>
<div id="chart-container">FusionCharts will render here</div>
<!-- Setting transparency of background image using: 
        # bgImageAlpha 

Deviation from theme:
       # canvasBgAlpha - Set to 0 as the purpose of the chart to show background cosmetics. 
-->

CSS

body {
    padding: 10px;
}

JavaScript

FusionCharts.ready(function () {
    var flavorChart = new FusionCharts({
        type: 'column2d',
        renderAt: 'chart-container',
        width: '400',
        height: '300',
        dataFormat: 'json',
        dataSource: {
            "chart": {
                "caption": "Top 3 Juice Flavors",
                "subCaption": "Last year",
                "xAxisName": "Flavor",
                "yAxisName": "Amount (In USD)",
                "numberPrefix": "$",
                "canvasBgAlpha": "0",
                "showAlternateHgridColor": "1",
                //Background image properties
                "bgImage": "http://upload.wikimedia.org/wikipedia/commons/7/79/Misc_fruit.jpg",
                //Background image transparency 
                "bgImageAlpha":"25",
                "bgImageDisplayMode":"stretch",
                //Theme
                "theme" : "fint"
            },
            "data": [
                {
                    "label": "Apple",
                    "value": "810000"
                }, 
                {
                    "label": "Cranberry",
                    "value": "620000"
                }, 
                {
                    "label": "Grapes",
                    "value": "350000"
                }
            ],
            "annotations": {
                "showbelow": "1",
                    "groups": [{
                    "id": "transarc",
                        "items": [{
                        "type": "circle",
                            "radius": "14",
                            "borderColor": "#FFFFFF",
                            "color": "#8CBB2C",
                            "alpha": "90",
                            "x": "0",
                            "y": "$chartCenterY"
                    }]
                }]
            },
        }
    });

    flavorChart.render();
});