public Snake()
{
InitializeComponent();
direction = "right";
snake = new List <snakemodel> {
new snakemodel {
x = 5, y = 6
},
new snakemodel {
x = 6, y = 6
},
new snakemodel {
x = 7, y = 6
},
new snakemodel {
x = 8, y = 6
},
new snakemodel {
x = 9, y = 6
},
};
Random random = new Random();
applemodel = new snakemodel {
x = random.Next(0, 45), y = random.Next(0, 40)
};
grid = new Grid {
RowSpacing = 1, ColumnSpacing = 1, HorizontalOptions = LayoutOptions.Center
};
frame = new Frame {
BorderColor = Color.Black, BackgroundColor = Color.FromRgba(255, 255, 255, 0)
};
apple = new BoxView {
BackgroundColor = Color.Red,
};
this.Appearing += async delegate
{
stack.Children.Clear();
await snakestart();
};
}
private async Task snakestart()
{
await Task.Run(() =>
{
for (int i = 0; i < 45; i++)
{
grid.ColumnDefinitions.Add(new ColumnDefinition {
Width = new GridLength(7)
});
}
for (int i = 0; i < 40; i++)
{
grid.RowDefinitions.Add(new RowDefinition {
Height = new GridLength(7)
});
}
});
grid.Children.Add(frame);
Grid.SetColumnSpan(frame, grid.ColumnDefinitions.Count);
Grid.SetRowSpan(frame, grid.RowDefinitions.Count);
grid.Children.Add(apple, applemodel.x, applemodel.y);
timer = new Timer();
timer.Interval = 400;
foreach (var q in snake)
{
BoxView box = new BoxView {
BackgroundColor = Color.FromHex("BEBEBE"),
};
grid.Children.Add(box, q.x, q.y);
}
Image right = new Image {
WidthRequest = 50, HeightRequest = 50, BackgroundColor = Color.FromRgba(255, 255, 255, 0), Source = "righta.png", Aspect = Aspect.Fill
};
Image left = new Image {
WidthRequest = 50, HeightRequest = 50, BackgroundColor = Color.FromRgba(255, 255, 255, 0), Source = "lefta.png", Aspect = Aspect.Fill
};
Image up = new Image {
WidthRequest = 50, HeightRequest = 50, BackgroundColor = Color.FromRgba(255, 255, 255, 0), Source = "upa.png", Aspect = Aspect.Fill
};
Image down = new Image {
WidthRequest = 50, HeightRequest = 50, BackgroundColor = Color.FromRgba(255, 255, 255, 0), Source = "downa.png", Aspect = Aspect.Fill
};
TapGestureRecognizer rtapGesture = new TapGestureRecognizer();
TapGestureRecognizer ltapGesture = new TapGestureRecognizer();
TapGestureRecognizer utapGesture = new TapGestureRecognizer();
TapGestureRecognizer dtapGesture = new TapGestureRecognizer();
rtapGesture.Tapped += delegate
{
if (direction != "left")
{
direction = "right";
}
};
ltapGesture.Tapped += delegate
{
if (direction != "right")
{
direction = "left";
}
};
utapGesture.Tapped += delegate
{
if (direction != "down")
{
direction = "up";
}
};
dtapGesture.Tapped += delegate
{
if (direction != "up")
{
direction = "down";
}
};
right.GestureRecognizers.Add(rtapGesture);
left.GestureRecognizers.Add(ltapGesture);
up.GestureRecognizers.Add(utapGesture);
down.GestureRecognizers.Add(dtapGesture);
Grid gridpad = new Grid
{
Margin = new Thickness(20, 5, 0, 0),
RowDefinitions = new RowDefinitionCollection {
new RowDefinition {
Height = new GridLength(50)
},
new RowDefinition {
Height = new GridLength(50)
},
new RowDefinition {
Height = new GridLength(50)
},
},
ColumnDefinitions = new ColumnDefinitionCollection {
new ColumnDefinition {
Width = new GridLength(50)
},
new ColumnDefinition {
Width = new GridLength(50)
},
new ColumnDefinition {
Width = new GridLength(50)
},
}
};
gridpad.Children.Add(right, 2, 1);
gridpad.Children.Add(left, 0, 1);
gridpad.Children.Add(up, 1, 0);
gridpad.Children.Add(down, 1, 2);
stack.Children.Add(grid);
stack.Children.Add(gridpad);
timer.Elapsed += delegate
{
Device.BeginInvokeOnMainThread(() =>
{
snakemodel nodemodel = new snakemodel();
nodemodel.x = snake[snake.Count - 1].x;
nodemodel.y = snake[snake.Count - 1].y;
for (int i = 0; i < snake.Count; i++)
{
grid.Children.RemoveAt(grid.Children.Count - 1);
}
if (snake[snake.Count - 1].x == applemodel.x && snake[snake.Count - 1].y == applemodel.y)
{
applemodel.x = new Random().Next(0, grid.ColumnDefinitions.Count);
applemodel.y = new Random().Next(0, grid.RowDefinitions.Count);
grid.Children.Add(apple, applemodel.x, applemodel.y);
snake.Add(nodemodel);
timer.Interval = (timer.Interval - 10) < 50?50: (timer.Interval - 10);
}
for (int i = 0; i < snake.Count; i++)
{
if (i == snake.Count - 1 && i != 0)
{
if (direction == "right")
{
snake[i].x = snake[i].x + 1;
}
else if (direction == "left")
{
snake[i].x = snake[i].x - 1;
}
else if (direction == "up")
{
snake[i].y = snake[i].y - 1;
}
else if (direction == "down")
{
snake[i].y = snake[i].y + 1;
}
}
else
{
snake[i].x = snake[i + 1].x;
snake[i].y = snake[i + 1].y;
}
if (snake[snake.Count - 1].y == grid.RowDefinitions.Count || snake[snake.Count - 1].x == grid.ColumnDefinitions.Count || snake[snake.Count - 1].x < 0 || snake[snake.Count - 1].y < 0)
{
BoxView newbox = new BoxView {
BackgroundColor = Color.FromHex("BEBEBE"),
};
grid.Children.Add(newbox, snake[i - 1].x, snake[i - 1].y);
DependencyService.Get <IToast>().LongAlert("游戏结束");
for (int j = 4; j < snake.Count; j++)
{
grid.Children.RemoveAt(grid.Children.Count - 1);
}
snake = new List <snakemodel> {
new snakemodel {
x = 5, y = 6
},
new snakemodel {
x = 6, y = 6
},
new snakemodel {
x = 7, y = 6
},
new snakemodel {
x = 8, y = 6
},
new snakemodel {
x = 9, y = 6
},
};
applemodel.x = new Random().Next(0, 50);
applemodel.y = new Random().Next(0, 50);
grid.Children.Add(apple, applemodel.x, applemodel.y);
direction = "right";
return;
}
BoxView box = new BoxView {
BackgroundColor = Color.FromHex("BEBEBE"),
};
grid.Children.Add(box, snake[i].x, snake[i].y);
}
});
};
timer.Start();
}
