# A Bar chart with multiple independent Y axes

This demonstration shows how you can use the YAxis drawing API object to draw multiple axes on your chart.

This goes in the documents header:

    <script src="RGraph.common.core.js"></script>
    <script src="RGraph.drawing.yaxis.js"></script>
    <script src="RGraph.bar.js"></script>

Put this where you want the chart to show up:

    <canvas id="cvs" width="600" height="250">
        [No canvas support]
    </canvas>

This is the code that generates the chart:

    <script>
        window.onload = function ()
        {
            var colors = [
                'Gradient(white:red)',
                'Gradient(white:brown)',
                'Gradient(white:blue)'
            ];

            var bar1 = new RGraph.Bar({
                id: 'cvs',
                data: [[2,0,0],[4,0,0],[6,0,0]],
                options: {
                    strokestyle: 'rgba(0,0,0,0)',
                    noaxes: true,
                    ylabels: false,
                    gutterLeft: 150,
                    colors: colors,
                    backgroundGridAutofitNumvlines: 3,
                    hmargin: 25,
                    hmarginGrouped: 3,
                    shadowColor: '#666',
                    shadowOffsetx: 2,
                    shadowOffsety: 2,
                    shadowBlur: 2,
                    textSize: 14
                }
            }).draw()

            var bar2 = new RGraph.Bar({
                id: 'cvs',
                data: [[0,20,0],[0,30,0],[0,40,0]],
                options: {
                    strokestyle: 'rgba(0,0,0,0)',
                    noaxes: true,
                    ylabels: false,
                    gutterLeft: 150,
                    colors: colors,
                    backgroundGrid: false,
                    hmargin: 25,
                    hmarginGrouped: 3,
                    shadowColor: '#666',
                    shadowOffsetx: 2,
                    shadowOffsety: 2,
                    shadowBlur: 2,
                    ymax: 50,
                    textSize: 14
                }
            }).draw()

            var bar3 = new RGraph.Bar({
                id: 'cvs',
                data: [[0,0,70],[0,0,80],[0,0,90]],
                options: {
                    strokestyle: 'rgba(0,0,0,0)',
                    labels: ['Monday','Tuesday','Wednesday'],
                    noyaxis: true,
                    ylabels: false,
                    gutterLeft: 150,
                    colors: colors,
                    backgroundGrid: false,
                    hmargin: 25,
                    hmarginGrouped: 3,
                    shadowColor: '#666',
                    shadowOffsetx: 2,
                    shadowOffsety: 2,
                    shadowBlur: 2,
                    ymax: 100,
                    textSize: 14
                }
            }).draw()

            var yaxis1 = new RGraph.Drawing.YAxis({
                id: 'cvs',
                x: 25,
                options: {
                    max: 10,
                    colors: ['red'],
                    textSize: 14,
                    textAccessible: true
                }
            }).draw()

            var yaxis2 = new RGraph.Drawing.YAxis({
                id: 'cvs',
                x: 75,
                options: {
                    max: 50,
                    colors: ['brown'],
                    textSize: 14,
                    textAccessible: true
                }
            }).draw()

            var yaxis3 = new RGraph.Drawing.YAxis({
                id: 'cvs',
                x: 125,
                options: {
                    max: 100,
                    colors: ['blue'],
                    textSize: 14,
                    textAccessible: true
                }
            }).draw()
        };
    </script>