Axis:

Axis:
Defines an axis for a chart.Use this to sets the units,scale,labeling,and other visual actions for the axis.You can define upto 4 axes for a single chart,one for each edge.

public class crChartController {
    // Return a list of data points for a chart
   
    public List<Data> getData() {
        return crChartController.getChartData();
    }
   
    // Make the chart data available via JavaScript remoting
   
    @RemoteAction
    public static List<Data> getRemoteData() {
        return crChartController.getChartData();
    }

    // The actual chart data; needs to be static to be
   
    // called by a @RemoteAction method
   
    public static List<Data> getChartData() {
        List<Data> data = new List<Data>();
        data.add(new Data('Jan', 30, 90, 55));
        data.add(new Data('Feb', 44, 15, 65));
        data.add(new Data('Mar', 25, 32, 75));
        data.add(new Data('Apr', 74, 28, 85));
        data.add(new Data('May', 65, 51, 95));
        data.add(new Data('Jun', 33, 45, 99));
        data.add(new Data('Jul', 92, 82, 30));
        data.add(new Data('Aug', 87, 73, 45));
        data.add(new Data('Sep', 34, 65, 55));
        data.add(new Data('Oct', 78, 66, 56));
        data.add(new Data('Nov', 80, 67, 53));
        data.add(new Data('Dec', 17, 70, 70));
        return data;
    }
   
    // Wrapper class
   
    public class Data {
        public String name { get; set; }
        public Integer data1 { get; set; }
        public Integer data2 { get; set; }
        public Integer data3 { get; set; }
        public Data(String name, Integer data1, Integer data2, Integer data3) {
            this.name = name;
            this.data1 = data1;
            this.data2 = data2;
            this.data3 = data3;
        }
    }
}

<apex:page controller="crChartController">
  <apex:chart height="400" width="700" data="{!data}">
    <apex:axis type="Numeric" position="left" fields="data1"
        title="Opportunities Closed" grid="true"/>
    <apex:axis type="Numeric" position="right" fields="data3"
        title="Revenue (millions)"/>
    <apex:axis type="Category" position="bottom" fields="name"
        title="Month of the Year">
        <apex:chartLabel rotate="315"/>
    </apex:axis>
    <apex:barSeries title="Monthly Sales" orientation="vertical" axis="right"
        xField="name" yField="data3"/>
    <apex:lineSeries title="Closed-Won" axis="left" xField="name" yField="data1"/>
</apex:chart>

</apex:page>