假設你正在使用一個點的圖表類型表示XY散點圖，假設你的數據源有兩列，X和Y - 定義數據點的X和Y坐標。同時也使這個圖表中有一個單一的類別分組表達式:=Fields![RowIndex] (例如按照列來分組)。

這個代碼實例創建了X和Y恒定的線，這是一般定位的X和Y坐標的平均值。代碼實例根據他們所屬的平均象限點來為他們著色。

要獲取的 X 和 Y 的列的平均值，我們使用兩個代碼參數：

Name: AverageX, Expression: =AVG(Fields!X)

Name: AverageY, Expression: =AVG(Fields!Y)

下面的代碼就是就是添加這個constant lines到第一個圖表區域，根據它們所屬的區域為這些點著色。

using System;
using System.Drawing;

using Nevron.GraphicsCore;
using Nevron.Chart;
using Nevron.ReportingServices;

namespace MyNamespace
{
    /// <summary>
    /// Sample class
    /// </summary>
    public class MyClass
    {
        /// <summary>
        /// Main entry point
        /// </summary>
        /// <param name="context"></param>
        public static void RSMain(NRSChartCodeContext context)
        {
            if (context.Document.Charts.Count == 0)
                return;

            // get the first chart in the document
            NChart chart = context.Document.Charts[0];
            if (chart.Series.Count == 0)
                return;

            // get the first point series in the chart
            NPointSeries point = chart.Series[0] as NPointSeries;
            if (point == null)
                return;

            // get the evaluated average X and Y
            double averageX = context.GetDoubleParameter("AverageX");
            double averageY = context.GetDoubleParameter("AverageY");

            // initialize quadrant colors
            Color[] quadrantColors = new Color[4];
            quadrantColors[0] = Color.Red;
            quadrantColors[1] = Color.Green;
            quadrantColors[2] = Color.Blue;
            quadrantColors[3] = Color.Yellow;

            // get the X and Y primary axes
            NAxis xAxis = chart.Axis(StandardAxis.PrimaryX);
            NAxis yAxis = chart.Axis(StandardAxis.PrimaryY);

            // add a constline for the left axis
            NAxisConstLine averageYConstLine = yAxis.ConstLines.Add();
            averageYConstLine.Value = averageY;

            // add a constline for the bottom axis
            NAxisConstLine averageXConstLine = xAxis.ConstLines.Add();
            averageXConstLine.Value = averageX;

            // colorize the data points according to quadrant
            int count = point.Values.Count;
            for (int i = 0; i < count; i++)
            {
                int quadrant = 0;
                double yValue = (double)point.Values[i];
                double xValue = (double)point.XValues[i];

                // determine quadrant
                if (yValue > averageY)
                {
                    if (xValue > averageX)
                    {
                        quadrant = 0;
                    }
                    else
                    {
                        quadrant = 1;
                    }
                }
                else
                {
                    if (xValue > averageX)
                    {
                        quadrant = 3;
                    }
                    else
                    {
                        quadrant = 2;
                    }
                }

                // set point color depending on quadrant
                point.FillStyles[i] = new NColorFillStyle(quadrantColors[quadrant]);
            }
        }
    }
}