c# - 无法在winforms C#中恢复以前的图纸

Question

所以我正在尝试制作俄罗斯方块游戏，但形状不会留下来。第一个形状工作正常，但是当第二个形状出现时，第一个形状消失了。

我尝试像在代码中一样在 Form1 的 Invalidate() 中设置整个区域，但没有帮助。即使是简单的 Invalidate() 也不起作用。

任何指导都会有很大帮助。

namespace Tetris
{
    public partial class Form1 : Form
    {
        int value = 0;
        Timer timer;
        string s;
        Point p;
        int widthOfShape = 0; int heightOfShape = 0;
        Graphics g;
        Point sizeOfPanel;

        Dictionary<int, string> shapes = new Dictionary<int, string>();

        public Form1()
        {
            InitializeComponent();
            shapes.Add(1, "Rectangle");
            shapes.Add(2, "Square");
            p.X = 0;
            p.Y = 0;
            timer = new Timer();
            timer.Interval = 800;
            timer.Tick += new EventHandler(Timer_Tick);
            timer.Enabled = true;
            timer.Start();
            SomeRandom();
            sizeOfPanel = new Point(488, 337);
        }

        public void SomeRandom()
        {
            s = ChooseOneShape();

            switch (s)
            {
                case "Rectangle":
                    widthOfShape = 80; heightOfShape = 20;
                    this.Invalidate(new Rectangle(0, 0, 500, 400));
                    break;

                case "Square":
                    widthOfShape = 40; heightOfShape = 40;
                    break;
            }
        }

        private void Timer_Tick(object sender, EventArgs e)
        {
            if (p.X + widthOfShape < sizeOfPanel.X && p.Y + heightOfShape < sizeOfPanel.Y)
            {
                p.X += 30;
                p.Y += 30;
                this.Invalidate(new Rectangle(0, 0, 500, 400));
            }
            else {
                p.X = 0;p.Y = 0;s = string.Empty;
                SomeRandom(); }
        }

        public string ChooseOneShape()
        {
            Random r = new Random();
            int index = r.Next(1, shapes.Count+1);
            return shapes[index];
        }

        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.FillRectangle(Brushes.Red, p.X, p.Y, widthOfShape, heightOfShape);
        }

    }
}

标签： c#winformstimer

Answer 1

我按照我认为应该完成的方式修改了您的代码。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;

namespace Tetris
{
    public partial class Form1 : Form
    {
        const int X = 488;
        const int Y = 337;
        Graphics g;
        Point sizeOfPanel;
        Timer timer;
        TetrisShape currentShape;
        public Form1()
        {
            InitializeComponent();
            this.Load += new EventHandler(Form1_Load);
        }
        public void Form1_Load(object sender, EventArgs e)
        {
            new TetrisShape("Rectangle");
            new TetrisShape("Square");
            currentShape = TetrisShape.SomeRandom();
            panel1.Controls.Add(currentShape);
            timer = new Timer();
            timer.Interval = 800;
            timer.Tick += new EventHandler(Timer_Tick);
            timer.Enabled = true;
            timer.Start();
            sizeOfPanel = new Point(X, Y);
            panel1.Height = Y;
            panel1.Width = X;

        }
        private void Timer_Tick(object sender, EventArgs e)
        {
            if (currentShape.p.X + currentShape.Width < sizeOfPanel.X && currentShape.p.Y + currentShape.Height < sizeOfPanel.Y)
            {
                currentShape.Top += 30;
                panel1.Refresh();
            }
            else
            {
                currentShape.p = new Point(0, 0);
                currentShape = TetrisShape.SomeRandom();
            }
        }
        private void Form1_Paint(object sender, PaintEventArgs e)
        {
            e.Graphics.FillRectangle(Brushes.Red, currentShape.ClientRectangle);
        }
    }
    public class TetrisShape : Control
    {
        static Dictionary<int, TetrisShape> shapes = new Dictionary<int, TetrisShape>();
        static Random rand = new Random();
        static string[] shapeTypes = { "Rectangle", "Square" };
        public int number { get; set; }
        public string name { get; set; }
        public Point p { get; set; }
        public static int maxNumber;

        public TetrisShape(string name)
        {
            this.name = name;
            p = new Point(0, 0);
            this.BackColor = Color.Red;
            switch (name)
            {
                case "Rectangle":
                    this.Invalidate(new Rectangle());
                    Width = 80; 
                    Height = 20;
                    number = ++maxNumber;
                    shapes.Add(number, this);

                    break;

                case "Square":
                    this.Invalidate(new Rectangle());
                    Width  = 40; 
                    Height = 40;
                    break;
            }
        }
        public static TetrisShape SomeRandom()
        {
            int shapeNumber = rand.Next(TetrisShape.shapeTypes.Length);
            return new TetrisShape(TetrisShape.shapeTypes[shapeNumber]);
        }
        public TetrisShape ChooseOneShape()
        {
            int index = rand.Next(1, shapes.Count + 1);
            return shapes[index];
        }
    }
}