Silverlight C# 游戏开发：Flyer06小小的改进让游戏更有趣

public class ClassFood : Canvas
{
private Rectangle _rectangle = new Rectangle()

{ Width = 32 , Height = 32 , Stroke = new SolidColorBrush(Colors.Green) };
Image Food;
ImageSource[] FoodFrames = new ImageSource[ 4 ];
public ClassFood()
{
Food = new Image();
BitmapImage bitmap = new BitmapImage( new Uri( @" Src/food.png " , UriKind.Relative));
bitmap.ImageOpened += new EventHandler < RoutedEventArgs > (bitmap_ImageOpened);
Food.Source = bitmap;
this .Children.Add(Food);

this .Children.Add(_rectangle);
}
private static int _framecont = 0 ;
void bitmap_ImageOpened( object sender, RoutedEventArgs e)
{
Food.Source = sender as BitmapImage;
for ( int i = 0 ; i < 4 ; i ++ )
{
WriteableBitmap wb = new WriteableBitmap( 32 , 32 );
wb.Render(Food, new TranslateTransform() { X = - 32 * i, Y = 0 });
wb.Invalidate();
FoodFrames[i] = (ImageSource)wb;
}
Food.Source = FoodFrames[_framecont];
_framecont ++ ;
if (_framecont >= 4 )
_framecont = 0 ;
}
/// <summary>
/// 移动速度
/// </summary>
public double Speed = 1 ;

public double X
{
get { return Canvas.GetLeft( this ); }
set { Canvas.SetLeft( this , value); }
}
public double Y
{
get { return Canvas.GetTop( this ); }
set { Canvas.SetTop( this , value); }
}
public Rect MyRect
{
get
{
return new Rect(X, Y, _rectangle.Width, _rectangle.Height);
}
}
}

public class ClassFoodGroup :Canvas
{
Random _random = new Random(( int )DateTime.Now.Ticks);
public ClassFoodGroup( int max)
{
int segment = ( int )(MainPage.ScreenWidth - 64 ) / max * 2 ;
for ( int i = 0 ; i < max; i ++ )
{
ClassFood food = new ClassFood();
this .Children.Add(food);
food.X = _random.Next(segment * i, segment * (i + 1 ));
food.Y = _random.Next(( int )MainPage.ScreenHeight - 64 ) + MainPage.ScreenHeight;
}
DispatcherTimer dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(TickGameFrameLoop);
dispatcherTimer.Interval = TimeSpan.FromMilliseconds( 10 ); // 重复间隔
dispatcherTimer.Start();
}
private void TickGameFrameLoop( object sender, EventArgs e)
{
foreach (UIElement s in this .Children)
{
if (s is ClassFood)
{
ClassFood cloud = (s as ClassFood);
if (cloud.Y >= - 32 )
cloud.Y -= cloud.Speed;
else
cloud.Y = _random.Next( 400 - 64 ) + 400 ;
}
}
}
}

public class ClassBackGroup:Canvas
{
// 天空的高度，在这里顺便了解一下在Silverlight里取得图片的宽高
private int skyHeight = 1000 ;
public ClassBackGroup()
{
Image _Image = new Image();
BitmapImage bitmap = new BitmapImage( new Uri( @" Src/sky.jpg " , UriKind.Relative)) ;
bitmap.ImageOpened += new EventHandler < RoutedEventArgs > (bitmap_ImageOpened);
_Image.Source = bitmap;
this .Children.Add(_Image);
DispatcherTimer dispatcherTimer = new DispatcherTimer();
dispatcherTimer.Tick += new EventHandler(TickBackGroupLogic);
dispatcherTimer.Interval = TimeSpan.FromMilliseconds( 40 ); // 重复间隔
dispatcherTimer.Start();
}
// 在这个完成事件中可以取得bitmap的高度，同样宽度也可以用类似的方式
void bitmap_ImageOpened( object sender, RoutedEventArgs e)
{
skyHeight = (sender as BitmapSource).PixelHeight;
}
public void TickBackGroupLogic( object sender, EventArgs e)
{
// 如果移动大于屏幕减去天空的高度，那么就不能再动了
if (Y < 400 - skyHeight)
Y -= Speed;
}
public double Speed = 0.5 ;

public double Y
{
get { return Canvas.GetTop( this ); }
set { Canvas.SetTop( this , value); }
}
}