How to color each piece in a pie chart ?

[Alexandre]

Hi,

Im using the following pie chart mark:

<telerik:RadHtmlChart ID="rhcGraficoResumoLeitos" SkinsOverrideStyles="true" runat="server" Width="350px" Height="300px">
                                        <ChartTitle Text="Ocupação dos leitos">
                                        </ChartTitle>
                                        <PlotArea>
                                            <Series>
                                                <telerik:PieSeries DataFieldY="Quantidade" ColorField="Cor" NameField="Situação" ExplodeField="IsExploded">
                                                    <LabelsAppearance DataFormatString="{0:N0}">
                                                    </LabelsAppearance>
                                                </telerik:PieSeries>
                                            </Series>
                                        </PlotArea>
                                    </telerik:RadHtmlChart>

And code behind:

private void CarregarResumoLeitos()
        {
            rhcGraficoResumoLeitos.DataSource = GetData();
            rhcGraficoResumoLeitos.DataBind();
        }

        private DataSet GetData()
        {
            ControladorInternacao controladorInternacao = new ControladorInternacao();
            List<SalaAtendimentoDTO> listaSalaAtendimento = controladorInternacao.ListarResumoLeitos(AmbienteConexao.Usuario().Cnes);

            Color[] barColors = new Color[8]{
               Color.Purple,
               Color.SteelBlue,
               Color.Aqua,
               Color.Yellow,
               Color.Navy,
               Color.Green,
               Color.Blue,
               Color.Red
           };

            DataSet ds = new DataSet("Estabelecimento");
            DataTable dt = new DataTable("SalaAtendimento");

            dt.Columns.Add("Gênero");
            dt.Columns.Add("Situação");
            dt.Columns.Add("Quantidade");
            dt.Columns.Add("Cor");
            dt.Columns.Add("IsExploded");

            int i = 0;
            foreach (SalaAtendimentoDTO salaAtendimentoDTO in listaSalaAtendimento)
            {
                dt.Rows.Add(salaAtendimentoDTO.Genero == string.Empty ? "teste" : salaAtendimentoDTO.Genero, salaAtendimentoDTO.SituacaoSala, salaAtendimentoDTO.Quantidade.ToString(), barColors[i++], true);
            }

            ds.Tables.Add(dt);
            return ds;
        }

        private static Color CorAleatoria()
        {
            Random randonGen = new Random();
            KnownColor[] names = (KnownColor[]) Enum.GetValues(typeof(KnownColor));
            KnownColor randomColorName = names[randonGen.Next(names.Length)];
            Color randomColor = Color.FromKnownColor(randomColorName);
            return randomColor;
        }

But im not able to color each item in the pie chart.

Can anyone help me please ?

Thanks in advance.

[Danail Vasilev]

Hi Alexandre,

You must use the ToKnownColor() method in order to convert the color structure to a known color. For example:

foreach (SalaAtendimentoDTO salaAtendimentoDTO in listaSalaAtendimento)
{
    dt.Rows.Add(salaAtendimentoDTO.Genero == string.Empty ? "teste" : salaAtendimentoDTO.Genero, salaAtendimentoDTO.SituacaoSala, salaAtendimentoDTO.Quantidade.ToString(), barColors[i++].ToKnownColor(), true);
}

You can also find a modified version of your example with this approach in the attached archive.

I have also changed the product of this forum thread as it is related to RadHtmlChart and not RadChart.

 

Regards,
Danail Vasilev
Telerik