Hi,

 

I have a shapeseries array, whose size gets calculated whilst the code is running. I am looking for a way to automatically arrange for each member of the array to have a different color. How do I iterate through the colors?

 

I have also tried to just iterate through the color.fromargb, but for some reason this just gives the same color for every member of the array.

For i = 0 To ALLSegments.GetUpperBound(0)

ALLSegments(i).Name = "Segment " & i

Dim RedValue As Integer

RedValue = i + 20

If RedValue > 255 Then

RedValue = 255

End If

ALLSegments(i).FillStyle = New NColorFillStyle(Color.FromArgb(50, RedValue, 255, 255))

Next

 

Does anyone have any ideas on this?

Thanks,

Marcus

Hi Marcus,

You can use the following code to create a color table with relatively distinct colors - like so:

private Color[] CreateColorTable()
  {
   Array knownColors =
Enum.GetValues(typeof(KnownColor));
   Color[] colorTable = new Color[knownColors.Length];

   int index = 0;

   foreach (KnownColor knownColor in knownColors)
   {
    Color color =
Color.FromKnownColor(knownColor);
    colorTable[index++] = color;
   }

   return colorTable;
  }

And then fetch a color from this table using a method like:

  private Color FetchColor(Color[] colorTable, ref int
colorIndex)
  {
   if (colorIndex >= colorTable.Length)
    colorIndex = 0;

   return colorTable[colorIndex++];
  }

Let us know if you meet any problems.

Best Regards,
Nevron Support Team

Create a array of Colors and use that to get unique color for the series fillStyle.

Follow this approach, it is in C# but help you.

// color array example

Color[] PreDefinedSeriesColors = {
Color.Red, Color.Green, Color.Blue, Color.Brown, Color.BlueViolet,
Color.Crimson, Color.Cyan, Color.DarkRed
};

//Create Series and set fillStyle
int indexOfSeries;
NBarSeries bar = new NBarSeries();
chart.Series.Add(bar);
indexOfSeries = chart.Series.IndexOf(bar);
chartSeries.FillStyle = GetUniqueSeriesColor(indexOfSeries);


///

/// Get the unique color for the series
///

/// Added Series index in chart.Series[index]
/// Unique Series Color
private Color CheckAndGetUniqueSeriesColor(int currentChartSeriesIndex)
{
NCartesianChart chart = chartControl.Charts[0] as NCartesianChart;
Color seriesColor = PreDefinedSeriesColors[currentChartSeriesIndex];
List usedColors = new List();
if (currentChartSeriesIndex > 0)
{
for (int i = 0; i <= currentChartSeriesIndex - 1; i++)
{
usedColors.Add((chart.Series[i] as NSeries).FillStyle.GetPrimaryColor().ToColor().Name);
}

for (int i = 0; i <= currentChartSeriesIndex - 1; i++)
{
Color x = (chart.Series[i] as NSeries).FillStyle.GetPrimaryColor().ToColor();
Color y = NColor.FromString(PreDefinedSeriesColors[i].Name).ToColor();
if ( x != y && !usedColors.Exists( color => color.Equals(y.Name)))
{
seriesColor = PreDefinedSeriesColors[i];
break;
}
}
}
return seriesColor;
}