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Get default color

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141502 Dec 14,2018 10:32 AM UTC Dec 16,2018 05:37 AM UTC Xamarin.Forms 1
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Tags: SfChart
Geraschenko
Asked On December 14, 2018 10:32 AM UTC

How can  get default color from LineSeries? 
Line is colorful, but in LineSeries color and colorModel is not set.

Geetha Rajendran [Syncfusion]
Replied On December 16, 2018 05:37 AM UTC

Hi Geraschenko, 
  
Greetings from Syncfusion, 
  
You can get the default color of series by using Dependency services. Please refer the below code snippet. 
  
Code snippet [C#] – Portable 
public interface IChartDependencyService 
{ 
   List<Color> GetColors(SfChart chart); 
} 
  
private void GetColors_Clicked(object sender, EventArgs e) 
{ 
  List<Color> colors = DependencyService.Get<IChartDependencyService>().GetColors(Chart); 
} 
  
Code snippet [C#] – Android 
    public class AndroidDependencyService : IChartDependencyService 
    { 
        public List<Color> GetColors(SfChart chart) 
        { 
            var nativeChart = SfChartRenderer.GetNativeObject(typeof(SfChart), chart) as native.SfChart; 
            List<Android.Graphics.Color> colorCollection = nativeChart.ColorModel.GetColors(nativeChart.ColorModel.ColorPalette); 
            List<Color> colors= new List<Color>(); 
  
            foreach(var color in colorCollection) 
            { 
               colors.Add(GetFormsColor(color));                  
            } 
  
            return colors; 
        } 
  
        internal static Color GetFormsColor(Android.Graphics.Color color) 
        { 
            return Color.FromRgba(color.R, color.G, color.B, color.A); 
        } 
    } 
  
Code snippet [C#] – iOS 
    Public class iOSDependencyService : IChartDependencyService 
    { 
        public List<Color> GetColors(SfChart chart) 
        { 
            var nativeChart = SfChartRenderer.GetNativeObject(typeof(SfChart), chart) as native.SFChart; 
            List<UIColor> colorCollection = nativeChart.ColorModel.GetColors(nativeChart.ColorModel.Palette); 
            List<Color> colors = new List<Color>(); 
  
            foreach (var color in colorCollection) 
            { 
                colors.Add(GetFormsColor(color)); 
            } 
  
            return colors; 
        } 
  
        internal static Color GetFormsColor(UIColor color) 
        { 
            if (color == null) 
            { 
                return Color.Default; 
            } 
  
            float red = 0.0f; 
            float green = 0.0f; 
            float blue = 0.0f; 
            float alpha = 0.0f; 
            CGColor colorRef = color.CGColor; 
            nfloat[] RGBAcomponents = colorRef.Components; 
  
            if (RGBAcomponents.Count() < 4) 
            { 
                return Color.Default; 
            } 
  
            red = (float)RGBAcomponents[0]; 
            green = (float)RGBAcomponents[1]; 
            blue = (float)RGBAcomponents[2]; 
            alpha = (float)RGBAcomponents[3]; 
  
            return Color.FromRgba(red, green, blue, alpha); 
        } 
    } 
  
Code snippet [C#] – UWP 
    public class UWPDependencyService : IChartDependencyService 
    { 
        public List<Color> GetColors(SfChart chart) 
        { 
            var nativeChart = SfChartRenderer.GetNativeObject(typeof(SfChart), chart) as native.SfChart; 
            List<Brush> brushes = nativeChart.ColorModel.GetBrushes(nativeChart.Palette); 
            List<Color> colors = new List<Color>(); 
  
            foreach (var brush in brushes) 
            { 
                colors.Add(GetFormsColor((brush as SolidColorBrush).Color)); 
            } 
  
            return colors; 
        } 
  
        internal static Xamarin.Forms.Color GetFormsColor(Windows.UI.Color color) 
        { 
           return Xamarin.Forms.Color.FromRgba(color.R, color.G, color.B, color.A); 
        } 
    } 
  
Sample – http://www.syncfusion.com/downloads/support/forum/141502/ze/GetColorModel-1263281595.zip 
  
Regards, 
Geetha R. 


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