# Combining more than two Line objects with multiple 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.common.dynamic.js"></script>
    <script src="RGraph.common.key.js"></script>
    <script src="RGraph.common.tooltips.js"></script>
    <script src="RGraph.common.key.js"></script>
    <script src="RGraph.drawing.yaxis.js"></script>
    <script src="RGraph.line.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>
        var gutterLeft = 160,
            gutterRight = 40,
            gutterTop   = 25;

        /**
        * This draws the extra axes. It's run whenever the line3 object is drawn
        */
        yaxis1 = new RGraph.Drawing.YAxis({
            id: 'cvs',
            x: 159,
            options: {
                colors: 'red',
                textColor: 'red',
                max: 10,
                title: 'Density',
                textAccessible: true
            }
        }).draw()

        yaxis2 = new RGraph.Drawing.YAxis({
            id: 'cvs',
            x: 110,
            options: {
                colors: 'green',
                textColor: 'green',
                max: 100,
                title: 'Speed',
                textAccessible: true
            }
        }).draw()

        yaxis3 = new RGraph.Drawing.YAxis({
            id: 'cvs',
            x: 50,
            options: {
                colors: 'blue',
                textColor: 'blue',
                max: 30,
                title: 'Pressure',
                textAccessible: true
            }
        }).draw();

        var line1 = new RGraph.Line({
            id: 'cvs',
            data: [1,3,5,2,5,6,8,4,4,5,3,6],
            options: {
                ymax: 10,
                hmargin: 5,
                gutterRight: gutterRight,
                gutterLeft: gutterLeft,
                gutterTop: gutterTop,
                labels: ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'],
                tooltips: ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'],
                colors: ['red', 'green', 'blue'],
                key: ['Density', 'Speed', 'Pressure'],
                keyPosition: 'gutter',
                keyPositionGutterBoxed: false,
                keyPositionX: 275,
                noaxes: true,
                ylabels: false,
                shadow: false,
                textAccessible: true
            }
        }).draw()

        var line2 = new RGraph.Line({
            id: 'cvs',
            data: [54,53,56,58,57,53,49,52,53,56,61,58],
            options: {
                ymax: 100,
                backgroundGrid: false,
                colors: ['green'],
                hmargin: 5,
                gutterRight: gutterRight,
                gutterLeft: gutterLeft,
                gutterTop: gutterTop,
                tooltips: ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'],
                noaxes: true,
                ylabels: false,
                shadow: false,
                textAccessible: true
            }
        }).draw()

        var line3 = new RGraph.Line({
            id: 'cvs',
            data: [31,35,32,36,34,32,33,35,28,17,18,18],
            options: {
                ymax: 50,
                backgroundGrid: false,
                ylabels: false,
                colors: ['blue'],
                hmargin: 5,
                gutterRight: gutterRight,
                gutterLeft: gutterLeft,
                gutterTop: gutterTop,
                tooltips: ['Jan','Feb','Mar','Apr','May','Jun','Jul','Aug','Sep','Oct','Nov','Dec'],
                noaxes: true,
                shadow: false,
                textAccessible: true
            }
        }).draw();
    </script>