FurnaceELK/FrameworkLocal/UICore/DxfScript/Dxf/DrawingCanvas.cs

using Newtonsoft.Json.Linq;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;

namespace MECF.Framework.UI.Core.DxfScript
{
    public class DrawingCanvas : Canvas
    {
        private DrawingVisual _drawingVisual = new DrawingVisual();
        protected override int VisualChildrenCount { get { return 1; } }
        private DrawingContext _dc = null;
        private Drawing _drawing = null;
        public void ClearDrawing()
        {
            _drawing = null;
        }
        public void SaveDrawing()
        {
            _drawing = _drawingVisual.Drawing;

        }
        public void LoadDrawing(double x, double y)
        {

            if (_drawing != null)
            {

                DrawingImage drawingImage = new DrawingImage(_drawing);

                _dc.DrawImage(drawingImage, new System.Windows.Rect(x + _drawing.Bounds.X, y + _drawing.Bounds.Y, _drawing.Bounds.Width, _drawing.Bounds.Height));


            }
        }
        protected override Visual GetVisualChild(int index)
        {
            if (index == 0)
            {
                return _drawingVisual;
            }
            throw new ArgumentOutOfRangeException();
        }
        public DrawingCanvas()
        {
            this.AddVisualChild(_drawingVisual);


        }
       
        public DrawingContext CreateGraphics()
        {
            if (_dc != null)
            {
                return _dc;
            }

            _dc = _drawingVisual.RenderOpen();

            return _dc;
        }
        public void Dispose()
        {

            if (_dc != null)
            {

                _dc.Close();

            }
            _dc = null;
        }

    }
}