Change custom brush depending on bar value

[Novel Alex]

Hello.

Using ColorModel with CustomBrushes works perfect if I set custom colors before using the chart. But I cannot set color dynamically during program execution (the simplest example is to paint bar in red/green based on some threshold). I tried the following:

private void SliderValueChanged(object sender, ValueChangedEventArgs e)

        {

            Random r = new Random();

            double newVal = 5 + r.Next(40); // here we obtain real bar value 

                        int index = (int)e.NewValue; // determine needed bar

            if (index > 4)

                return;

// determine color

            Color c = Color.LightGreen;

            if (newVal < 20)

                c = Color.Black;

            else if (newVal > 40)

                c = Color.LightSkyBlue;

            series.ColorModel.CustomBrushes[index] = c; // <------ here I try to use new color 

            datas[index].YValue = newVal;

        }

But it doesn't work. Can you advise, how to do it correctly?

Thanks, 

Vadim.

P.S. I maid a little sample to explain my question.

Attachment: cb2_39eec314.zip

[Novel Alex]

Update. I can achive needed results with the next code modification (bold), it looks like some kind of brushes cashing is used.

        private void SliderValueChanged(object sender, ValueChangedEventArgs e)

        {

            Random r = new Random();

            double newVal = 5 + r.Next(40);

            int index = (int)e.NewValue;

            if (index > 4)

                return;

            Color c = Color.LightGreen;

            if (newVal < 20)

                c = Color.Black;

            else if (newVal > 40)

                c = Color.LightSkyBlue;

            var list = (from col in chart.Series[0].ColorModel.CustomBrushes select col).ToList();

            list[index] = c;

            series.ColorModel.CustomBrushes = list;

            datas[index].YValue = newVal;

        }

But it seems to be very expencive to make new list every time. Maybe, better way exists?

[Parthiban Sundaram]

Hi Carlo,

Thanks for using Syncfusion products.

We would like to inform you that the given solution was the best possible way to change custom brush color dynamically.

Please let us know, if you need further assistance on this.

Regards,
Parthiban

[Novel Alex]

Hello, Parthiban. 

Thank you for the information! This topic can be closed.

[Parthiban Sundaram]

Hi Novel,

Thanks for the update. We are glad that the given solution has helped to achieve your requirement. Please let us know, if you need further assistance on this.

Regards,
Parthiban S