DrawingCanavs.cs

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using SciencePad.Visuals;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Shapes;

namespace SciencePad
{
    public class DrawingCanavs : Canvas
    {
        #region 常量

        private const int UnitPerPixel = 50;        // 一个单位等于20个像素

        private static readonly Pen AxisPen = new Pen(Brushes.Silver, 2);
        private static readonly Pen BorderPen = new Pen(Brushes.Silver, 2);

        #endregion

        #region 实例变量

        /// <summary>
        /// 当前画板上的所有的图形集合
        /// </summary>
        private List<VisualCircle> geometryList;

        #endregion

        #region 属性

        /// <summary>
        /// 坐标轴原点
        /// </summary>
        public Point OriginalPoint { get; private set; }

        #endregion

        #region 构造方法

        public DrawingCanavs()
        {
            this.UseLayoutRounding = true;
            this.Background = Brushes.White;

            this.geometryList = new List<ScienceGeometry>();
        }

        #endregion

        #region 重写函数

        protected override void OnMouseLeftButtonDown(MouseButtonEventArgs e)
        {