Chart Code Example

In This Topic

Lets assumes that the you are displaying a XY scatter plot with the Point Chart Type. Lets also assume that your data source has two columns - X and Y - defining the data points X and Y coordinates. Also let the chart has a single category grouping expression:=Fields![RowIndex] (e.g. group by row).

The code example creates X and Y constant lines that are positioned at the average X and average Y coordinates. The code example colorizes the points according to average quadrant to which they belong.

To get the average values for the X and Y columns we use two code parameters:

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

The following code adds the constant lines to the first chart area and colorizes the points in the first point series according to the quadrant to which they belong.

C#	Copy Code
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]); } } } }

Copy Code

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]);
            }
        }
    }
}

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