WPF游戏编程02--物体运动

<Canvas x:Name="container" Width="800" Height="600" Background="Silver"                 MouseLeftButtonDown="container_MouseLeftButtonDown">        </Canvas>

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Windows;using System.Windows.Controls;using System.Windows.Data;using System.Windows.Documents;using System.Windows.Input;using System.Windows.Media;using System.Windows.Media.Imaging;using System.Windows.Shapes;namespace WPFApplication{    /// <summary>    /// chap02.xaml 的交互逻辑    /// </summary>    public partial class chap02 : Window    {        public chap02()        {            InitializeComponent();            DrawPentacle();        }        private void DrawPentacle()        {            pentacle = new Polygon();            pentacle.Stroke = System.Windows.Media.Brushes.DarkGray;            pentacle.StrokeThickness = 0.1;            pentacle.Fill = new SolidColorBrush(Colors.Red);            pentacle.Opacity = 0.4;            PointCollection pointCollection = new PointCollection();            pointCollection.Add(new Point(0,0));            pointCollection.Add(new Point(100,0));            pointCollection.Add(new Point(100,100));            pointCollection.Add(new Point(0,100));            pentacle.Points = pointCollection;            Canvas.SetLeft(pentacle, 0);            Canvas.SetTop(pentacle, 0);            container.Children.Add(pentacle);            CompositionTarget.Rendering += new EventHandler(TimeTick);        }        private void TimeTick(object sender, EventArgs e)        {            double pentacleX = Canvas.GetLeft(pentacle);            double pentacleY = Canvas.GetTop(pentacle);            Canvas.SetLeft(pentacle, (moveTo.X > pentacleX) ? (pentacleX + speed) : (pentacleX - speed));            Canvas.SetTop(pentacle, (moveTo.Y > pentacleY) ? (pentacleY + speed) : (pentacleY - speed));        }        private void container_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)        {            moveTo = e.GetPosition(container);        }        private Polygon pentacle;        private int speed = 1;        private Point moveTo;    }}