吃豆子游戏-如何修复

Question

I am creating really simple pacman game as a homework. I am working in Visual Studio, in c#. The problem is, when I click run, only the winform shows with nothing on it. Can someone tell me what have I done wrong?

namespace pacman
{
    public partial class Form1 : Form
    {
        Timer timer;
        Pacman pacman;
        static readonly int TIMER_INTERVAL = 250;
        static readonly int WORLD_WIDTH = 15;
        static readonly int WORLD_HEIGHT = 10;
        Image foodImage;
        bool[][] foodWorld;

        public Form1()
        {
            InitializeComponent();

            foodImage = Properties.Resources.orange_detoure;
            DoubleBuffered = true;
            newGame();
        }

        public void newGame()
        {
            pacman = new Pacman();
            this.Width = Pacman.radius * 2 * (WORLD_WIDTH + 1);
            this.Height = Pacman.radius * 2 * (WORLD_HEIGHT + 1);

            foodWorld = new bool[WORLD_WIDTH][];

            timer = new Timer();
            timer.Interval = TIMER_INTERVAL;
            timer.Tick += new EventHandler(timer_Tick);
            timer.Start();
        }

        void timer_Tick(object sender, EventArgs e)
        {
            timer.Interval = TIMER_INTERVAL - 1;
            if (TIMER_INTERVAL == 0)
            {
                timer.Stop();
            }
            pacman.Move(WORLD_WIDTH, WORLD_HEIGHT);
            Invalidate();
        }

        private void Form1_KeyUp(object sender, KeyEventArgs e)
        {
            if (Keys.Up != 0) 
            {
                pacman.ChangeDirection("UP");
            }
            if (Keys.Down != 0)
            {
                pacman.ChangeDirection("DOWN");
            }
            if (Keys.Left != 0)
            {
                pacman.ChangeDirection("LEFT");
            }
            if (Keys.Right != 0)
            {
                pacman.ChangeDirection("RIGHT");
            }
            Invalidate();
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            Graphics g = e.Graphics;
            g.Clear(Color.White);
            for (int i = 0; i < foodWorld.Length; i++)
            {
                for (int j = 0; j < foodWorld[i].Length; j++)
                {
                    if (foodWorld[i][j])
                    {
                        g.DrawImageUnscaled(foodImage, j * Pacman.radius * 2 + (Pacman.radius * 2 - foodImage.Height) / 2, i * Pacman.radius * 2 + (Pacman.radius * 2 - foodImage.Width) / 2);
                    }
                }
            }
            pacman.Draw(g);
        }
    }
}

And here is the class Pacman:

namespace pacman
{
    public class Pacman
    {
        public enum dir {UP, DOWN, RIGHT, LEFT}; 

        public float x { get; set; }
        public float y { get; set; }
        public string direction { get; set; }
        static public int radius = 20;
        public double speed { get; set; }
        public bool open { get; set; }
        public Brush brush = new SolidBrush(Color.Yellow);

        public Pacman() {
            this.x = 7;
            this.y = 5;
            this.speed = 20;
            this.direction = Convert.ToString(dir.RIGHT);
            this.open = false;
        }

        public void ChangeDirection(string direct)
        {
            // vasiot kod ovde
            for (int i = 0; i < 3; i++) { 

                if(direct == Convert.ToString(dir.RIGHT))
                {
                    direction = "RIGHT";
                }
                if (direct == Convert.ToString(dir.LEFT))
                {
                    direction = "LEFT";
                }
                if (direct == Convert.ToString(dir.UP))
                {
                    direction = "UP";
                }
                if (direct == Convert.ToString(dir.DOWN))
                {
                    direction = "DOWN";
                }
            }
        }

        public void Move(float width, float height)
        {
            if (direction == Convert.ToString(dir.RIGHT))
            {
                x = x + 1;
                if (x > width) {
                    x = 1;
                }
            }
            else if (direction == Convert.ToString(dir.LEFT))
            {
                x = x - 1;
                if (x < 0) {
                    x = 14;
                }
            }
            else if (direction == Convert.ToString(dir.UP))
            {
                y = y + 1;
                if (y > height) {
                    y = 1;
                }
            }
            else if (direction == Convert.ToString(dir.DOWN))
            {
                y = y - 1;
                if (y < 0) {
                    y = 14;
                }
            }
        }

        public void Draw(Graphics g)
        {
            if (!open) {
                g.FillEllipse(brush, 7, 5, 15, 15);
            }
        }   
    }
}

It should look like this http://prntscr.com/70e0jt . I will be grateful if someone can tell me what should I fix so it finally works..

Answer 1

Add this to your constructor:

this.Paint += Form1_Paint;

What is happening is that you made a Paint handler, but never assigned the paint event to handle it (that I can see, its possible that the event was assigned in the other partial part of the class).

The other problem is that you did not fully define the "food world" variable, you initialized the first rank, but not the second. You need to fully initialize this and set the booleans inside of it.