WPF绘制图形

利用WPF绘制简单图形，就像Winform那样，参考DrawToolsWPF。

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

namespace WpfApplication1
{
    public class DrawCanvas : Canvas
    {
        private VisualCollection graphics;
        private DrawingContext context;
        private DrawingVisual visual;
        private Point start;

        public DrawCanvas()
        {
            graphics = new VisualCollection(this);
            visual = new DrawingVisual();
            graphics.Add(visual);
            MouseDown += new System.Windows.Input.MouseButtonEventHandler(DrawCanvas_MouseDown);
            MouseMove += new System.Windows.Input.MouseEventHandler(DrawCanvas_MouseMove);
            MouseUp += new System.Windows.Input.MouseButtonEventHandler(DrawCanvas_MouseUp