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Data Driven Bar Width

Posted By Martyn Bullerwell 9 Years Ago
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Martyn Bullerwell
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Hi,

I am currently evaluating the SSRS add-ins as I am looking for something that will give the same output as follows:

http://demos4.dundas.com/AddOn/VariableWidth/VariableWidth.aspx

Sadly, this is no longer available, and Microsoft did not port this functionality across when they integrated Dundas into SSRS. I need each column to be a different width based on a measure, and need the gaps between the columns to be equal. I am trying to avoid having to hack the data set to create a time series.

Any help with this would be greatly appreciated.

Cheers

Martyn



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Hi Martyn,

You can easily achieve this chart using the range chart - check out the ChartTypes_Range2D.rdl example shipped with the control. Let us know if you meet any problems or have any questions.



Best Regards,
Nevron Support Team



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Hi,

Thanks for your response, but sadly this does not give me what I need, With this I would need to heavily maipulate the data I retrive, which is not Ideal. My Data set is as follows:

Category, % for Height, % for Width.

I would like the Cateogry to be along the X Axis, with the %Width dictating the Width of the bar, where the % Height is the Y axis.  It is very simple, but no one seems to support it, it is not a range.

Many thanks

Martyn



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Hi Martyn,

It can certainly be done with custom code (that modifies the chart appearance after the data has been loaded). If you send us sample data we can create a sample report showing how to achieve it...



Best Regards,
Nevron Support Team



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Hi,

That would be great, I have send some sample data as an Email. 

Thanks so much for your help.

Kind regards

Martyn

 



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Hi Martyn,

Please find attached the sample report that shows a chart as percentages on the x axis. To replicate the report on your end you can follow these steps:

1. Create a table called [SampleTable] in the sample database (NRSVisionExamplesDB) distrubted with Nevron Chart for SSRS. Fill the following data in it:

AgeBandBarWidthMeasure
Under 160.032155911549
16 to 200.151817552440
21 to 240.18388157004
25 to 340.331508585570
35 to 440.169562546703
45 to 540.0873976825066
55 to 640.027729798421
65 +0.0081255792061

2. Add the SampleReport1.rdl file to the examples solution shipped with the control and run it - you should get the following result:

Variable Width Bars Chart SSRS

A few explanations:
1. To achieve this chart we used the range series. It accepts four values x1, x2, y1, y2 definining a rectangle in scale space. Those four values map to the table as follows:

X1 = percentage
X2 = nothing
Y1 = 0
Y2 = Measure

In addition we also import the label value.

2. Then to assign X2 values we use the following 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;
                                                NChart chart = context.Document.Charts[0];
                                               
                                                if (chart.Series.Count == 0)
                                                                return;
                                               
                                                NRangeSeries rangeSeries = chart.Series[0] as NRangeSeries;
                               
                                                if (rangeSeries == null)
                                                                return;
                                               
                                                // compute total percentage
                                                int count = rangeSeries.XValues.Count;
                                                double total = 0;
                                               
                                                for (int i = 0; i < count; i++)
                                                {
                                                                total += (double)rangeSeries.XValues[i];
                                                }

                                                // then assign a value to x and x2
                                                double xStart = 0;
                                                double xEnd = 0;
                                                rangeSeries.X2Values.Clear();

                                                if (total <= 0)
                                                                return;

                                                for (int i =0; i < count; i++)
                                                {
                                                                xEnd = xStart + ((double)rangeSeries.XValues[i] / total);
                                                               
                                                                rangeSeries.XValues[i] = xStart;
                                                                rangeSeries.X2Values.Add(xEnd);

                                                                xStart = xEnd;
                                                }

                                                // create a linear axis with custom labels to annotate the range series
                                                NLinearScaleConfigurator scaleX = new NLinearScaleConfigurator();

                                                scaleX.AutoLabels = false;
                                                scaleX.MajorTickMode = MajorTickMode.CustomTicks;

                                                for (int i = 0; i < count; i++)
                                                {
                                                                NCustomValueLabel label = new NCustomValueLabel();
                                                                label.Text = (string)rangeSeries.Labels[i];
                                                                label.Value = ((double)rangeSeries.XValues[i] + (double)rangeSeries.X2Values[i]) / 2;
                                                                scaleX.CustomLabels.Add(label);
                                                                scaleX.CustomMajorTicks.Add((double)rangeSeries.X2Values[i]);
                                                }
                                               
                                                chart.Axis(StandardAxis.PrimaryX).ScaleConfigurator = scaleX;
                                }
                }
}

In a nutshell it does the following:

1. Compute the total for all percentages.
2. Assign X1, X2 for each bar in the series depending on it’s percentage and the total.
3. Create a custom value labels for the x axis to annotate those bars.

Hope this helps – let us know if you meet any problems or have any questions.



Best Regards,
Nevron Support Team



Attachments
SampleReport1.rdl (226 views, 17.00 KB)


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