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public class SketchTool : ImageEditorTool
{
    public List<IFilter> filters = new List<IFilter>();
    public SketchFilter sketchFilter = new SketchFilter();
 
    public SketchTool()
    {
        filters.Add(sketchFilter);
    }
 
    public override string Name
    {
        get { return "Sketch Tool"; }
    }
 
    public override string Icon
    {
        get { return @"/ImageEditorBlogPost;Component/Assets/sketch-light.png";}
    }
 
    private bool isGrayChecked;
    public bool IsGrayChecked
    {
        get
        {
            return this.isGrayChecked;
        }
 
        set
        {
            if (this.isGrayChecked == value)
            {
                return;
            }
 
            this.isGrayChecked = value;
 
            if (value)
            {
                this.OnSketchModeChanged(SketchMode.Gray);
            }
 
            this.OnPropertyChanged("IsGrayChecked");
        }
    }
 
    private bool isColorChecked;
    public bool IsColorChecked
    {
        get
        {
            return this.isColorChecked;
        }
 
        set
        {
            if (this.isColorChecked == value)
            {
                return;
            }
 
            this.isColorChecked = value;
 
            if (value)
            {
                this.OnSketchModeChanged(SketchMode.Color);
            }
 
            this.OnPropertyChanged("IsColorChecked");
        }
    } 

    protected override async Task<System.Windows.Media.Imaging.WriteableBitmap> ApplyCore(System.Windows.Media.Imaging.WriteableBitmap actualImage)
    {
       actualImage = await NokiaRenderer.Render(actualImage, filters);
 
        return actualImage; 
    }

    protected async void OnSketchModeChanged(SketchMode mode)
    {
        this.sketchFilter.SketchMode = mode;
        this.ResetWorkingBitmap();
        this.workingBitmap = await NokiaRenderer.Render(this.workingBitmap, filters);
        this.ModifiedImage = this.workingBitmap;
    }
}