Tetris on C # in 100 lines

UPD. Link to github.

Recently I had an idea - to write a simple game in the minimum number of lines. My choice fell on Tetris. In this article I will describe my code.



To begin with, it is worth noting that in my implementation I included only the basic features:

• movement of figures left / right;
• the fall of the figures;
• turn figures;
• deleting filled figures;
• ending the game.

So, first add a PictureBox to the form and create a timer.



Also, the game will need:

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public const int width = 15, height = 25, k = 15; //        public int[,] shape = new int[2, 4]; //      (   2  [0, i]  [1, i] public int[,] field = new int[width, height]; //     public Bitmap bitfield = new Bitmap(k * (width + 1) + 1, k * (height + 3) + 1); public Graphics gr; //     PictureBox 

Fill the field at the edges:

  for (int i = 0; i < width; i++) field[i, height - 1] = 1; for (int i = 0; i < height; i++) { field[0, i] = 1; field[width - 1, i] = 1; } 

Fill the shape:

  public void SetShape(){ Random x = new Random(DateTime.Now.Millisecond); switch (x.Next(7)){ //   1  7   case 0: shape = new int[,] { { 2, 3, 4, 5 }, { 8, 8, 8, 8 } }; break; case 1: shape = new int[,] { { 2, 3, 2, 3 }, { 8, 8, 9, 9 } }; break; case 2: shape = new int[,] { { 2, 3, 4, 4 }, { 8, 8, 8, 9 } }; break; case 3: shape = new int[,] { { 2, 3, 4, 4 }, { 8, 8, 8, 7 } }; break; case 4: shape = new int[,] { { 3, 3, 4, 4 }, { 7, 8, 8, 9 } }; break; case 5: shape = new int[,] { { 3, 3, 4, 4 }, { 9, 8, 8, 7 } }; break; case 6: shape = new int[,] { { 3, 4, 4, 4 }, { 8, 7, 8, 9 } }; break; } } 

The procedure that draws a “glass” in PictureBox:

 public void FillField(){ gr.Clear(Color.Black); //  for (int i = 0; i < width; i++) for (int j = 0; j < height; j++) if (field[i, j] == 1){ //     gr.FillRectangle(Brushes.Green, i * k, j * k, k, k); //      gr.DrawRectangle(Pens.Black, i * k, j * k, k, k); } for (int i = 0; i < 4; i++){ //    gr.FillRectangle(Brushes.Red, shape[1, i] * k, shape[0, i] * k, k, k); gr.DrawRectangle(Pens.Black, shape[1, i] * k, shape[0, i] * k, k, k); } FieldPictureBox.Image = bitfield; } 

I first move the figures, and then check whether such an option is possible or not. If there is an error in some place (the figure has gone beyond the bounds of the field or superimposed on the figure already lying in the field), the figure returns to its previous place. For this, I wrote a function that returns true if an error was found on the field or false if there is no error:

  public bool FindMistake(){ for (int i = 0; i < 4; i++) if (shape[1, i] >= width || shape[0, i] >= height || shape[1, i] <= 0 || shape[0, i] <= 0 || field[shape[1, i], shape[0, i]] == 1) return true; return false; } 

Now proceed to the movement of the figures. Create a KeyDown event in the constructor.



Move left:

  switch (e.KeyCode){ case Keys.A: for (int i = 0; i < 4; i++) shape[1, i]--; //        1    OX if (FindMistake()) //      for (int i = 0; i < 4; i++) shape[1, i]++; //     1  break; ... } 

Similarly, moving right:

  case Keys.D: for (int i = 0; i < 4; i++) shape[1, i]++; if (FindMistake()) for (int i = 0; i < 4; i++) shape[1, i]--; break; 

Turning the figure is a bit more complicated:

 case Keys.W: var shapeT = new int[2, 4]; Array.Copy(shape, shapeT, shape.Length); //   ,   ,       ,    ,     int maxx = 0, maxy = 0; for (int i = 0; i < 4; i++){ if (shape[0, i] > maxy) maxy = shape[0, i]; if (shape[1, i] > maxx) maxx = shape[1, i]; } //       X   Y for (int i = 0; i < 4; i++) { int temp = shape[0, i]; shape[0, i] = maxy - (maxx - shape[1, i]) - 1; shape[1, i] = maxx - (3 - (maxy - temp)) + 1; } //  .               . if (FindMistake()) Array.Copy(shapeT, shape, shape.Length); break; 

Now it remains only to add a drop of figures and the removal of lines. All this will happen at the TimerTick event:

 private void TickTimer_Tick(object sender, System.EventArgs e){ if (field[8, 3] == 1) Environment.Exit(0); //   ,     ,  . for (int i = 0; i < 4; i++) shape[0, i]++; //    if (FindMistake()){ for (int i = 0; i < 4; i++) field[shape[1, i], --shape[0, i]]++; SetShape(); } //   ,    1  ,     field     for (int i = height - 2; i > 2; i--){ var cross = (from t in Enumerable.Range(0, field.GetLength(0)).Select(j => field[j, i]).ToArray() where t == 1 select t).Count(); //      if (cross == width) for (int k = i; k > 1; k--) for (int l = 1; l < width - 1; l++) field[l, k] = field[l, k - 1]; } //    ,   ,     ,   ,     ,  1  FillField(); //   } 

Finally, when creating a form, call:

  SetShape(); 

Summary Code:

 using System; using System.Linq; using System.Drawing; using System.Windows.Forms; namespace LittleTetris{ public partial class Form1 : Form{ public const int width = 15, height = 25, k = 15; public int[,] shape = new int[2, 4]; public int[,] field = new int[width, height]; public Bitmap bitfield = new Bitmap(k * (width + 1) + 1, k * (height + 3) + 1); public Graphics gr; public Form1(){ InitializeComponent(); gr = Graphics.FromImage(bitfield); for (int i = 0; i < width; i++) field[i, height - 1] = 1; for (int i = 0; i < height; i++) { field[0, i] = 1; field[width - 1, i] = 1; } SetShape(); } public void FillField(){ gr.Clear(Color.Black); for (int i = 0; i < width; i++) for (int j = 0; j < height; j++) if (field[i, j] == 1){ gr.FillRectangle(Brushes.Green, i * k, j * k, k, k); gr.DrawRectangle(Pens.Black, i * k, j * k, k, k); } for (int i = 0; i < 4; i++){ gr.FillRectangle(Brushes.Red, shape[1, i] * k, shape[0, i] * k, k, k); gr.DrawRectangle(Pens.Black, shape[1, i] * k, shape[0, i] * k, k, k); } FieldPictureBox.Image = bitfield; } private void TickTimer_Tick(object sender, System.EventArgs e){ if (field[8, 3] == 1) Environment.Exit(0); for (int i = 0; i < 4; i++) shape[0, i]++; for (int i = height - 2; i > 2; i--){ var cross = (from t in Enumerable.Range(0, field.GetLength(0)).Select(j => field[j, i]).ToArray() where t == 1 select t).Count(); if (cross == width) for (int k = i; k > 1; k--) for (int l = 1; l < width - 1; l++) field[l, k] = field[l, k - 1];} if (FindMistake()){ for (int i = 0; i < 4; i++) field[shape[1, i], --shape[0, i]]++; SetShape();} FillField(); } private void Form1_KeyDown(object sender, KeyEventArgs e){ switch (e.KeyCode){ case Keys.A: for (int i = 0; i < 4; i++) shape[1, i]--; if (FindMistake()) for (int i = 0; i < 4; i++) shape[1, i]++; break; case Keys.D: for (int i = 0; i < 4; i++) shape[1, i]++; if (FindMistake()) for (int i = 0; i < 4; i++) shape[1, i]--; break; case Keys.W: var shapeT = new int[2, 4]; Array.Copy(shape, shapeT, shape.Length); int maxx = 0, maxy = 0; for (int i = 0; i < 4; i++){ if (shape[0, i] > maxy) maxy = shape[0, i]; if (shape[1, i] > maxx) maxx = shape[1, i]; } for (int i = 0; i < 4; i++) { int temp = shape[0, i]; shape[0, i] = maxy - (maxx - shape[1, i]) - 1; shape[1, i] = maxx - (3 - (maxy - temp)) + 1; } if (FindMistake()) Array.Copy(shapeT, shape, shape.Length); break; } } public void SetShape(){ Random x = new Random(DateTime.Now.Millisecond); switch (x.Next(7)){ case 0: shape = new int[,] { { 2, 3, 4, 5 }, { 8, 8, 8, 8 } }; break; case 1: shape = new int[,] { { 2, 3, 2, 3 }, { 8, 8, 9, 9 } }; break; case 2: shape = new int[,] { { 2, 3, 4, 4 }, { 8, 8, 8, 9 } }; break; case 3: shape = new int[,] { { 2, 3, 4, 4 }, { 8, 8, 8, 7 } }; break; case 4: shape = new int[,] { { 3, 3, 4, 4 }, { 7, 8, 8, 9 } }; break; case 5: shape = new int[,] { { 3, 3, 4, 4 }, { 9, 8, 8, 7 } }; break; case 6: shape = new int[,] { { 3, 4, 4, 4 }, { 8, 7, 8, 9 } }; break; } } public bool FindMistake(){ for (int i = 0; i < 4; i++) if (shape[1, i] >= width || shape[0, i] >= height || shape[1, i] <= 0 || shape[0, i] <= 0 || field[shape[1, i], shape[0, i]] == 1) return true; return false; } } } 

As a result, except for lines with a closing bracket and a painted condition in FindMistake, it turns out 95 lines.



Here is a screenshot of the running program: