using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Media;

namespace MuchInfo.Chart.WPF.Primitives.Drawing
{
    public class DrawingHost : UIElement
    {
   
       private VisualCollection _children;
        protected override int VisualChildrenCount
        {
            get { return _children.Count; }
        }

        public DrawingHost()
        {
            _children=new VisualCollection(this);
        }

        // Provide a required override for the GetVisualChild method.
        protected override Visual GetVisualChild(int index)
        {
            if (index < 0 || index >= _children.Count)
            {
                throw new ArgumentOutOfRangeException();
            }

            return _children[index];
        }
         
        public void ClearDrawing()
        {
             _children.Clear();
             if (_children != null  )
            foreach (var child in _children)
            {
                this.RemoveVisualChild(child);
            }
        }


        public void DrawingLine(Brush penBrush, double thickness, Point point1, Point point2)
        {
            var visual=new DrawingVisual();
           
          var drawContext=  visual.RenderOpen();
            drawContext.DrawLine(new Pen(penBrush,thickness),point1,point2);
            drawContext.Close();
            _children.Add(visual);
          
        }


    }
}