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Road to simple HTML + JS to achieve the most simple game Tetris

2020-11-06 21:04:13 kingapple

Preface

To be honest, this is actually the second Tetris I wrote .
This rewrite , Besides reviewing the code I wrote before , There are also some new ideas .
One of the most important purposes is to separate the rendering layer from the logic layer at the code level ( Redesign the code ).
—— The final effect is as follows .
 Insert picture description here


On the subject

Take a look at some of the concepts and logic of Tetris

One 、 square

The most traditional Tetris , Only 7 Square block .
Usually by T、I、Z、S、L、J、O this 7 One letter instead of .

Convert to code as follows .

shaps = {
    'I': [
      [1, 1, 1, 1],
    ],
    'L': [
      [1, 1, 1],
      [1, 0, 0],
    ],
    'J': [
      [1, 1, 1],
      [0, 0, 1],
    ],
    'Z': [
      [1, 1, 0],
      [0, 1, 1],
    ],
    'S': [
      [0, 1, 1],
      [1, 1, 0],
    ],
    'T': [
      [1, 1, 1],
      [0, 1, 0],
    ],
    'O': [
      [1, 1],
      [1, 1],
    ],
  };
  
  enumShaps = {
    'I': [
      [[0,0],[1,0],[2,0],[3,0]],
      [[1,-1],[1,0],[1,1],[1,2]],
    ],
    'L':[
      [[0,0],[1,0],[2,0],[0,1]],
      [[0,0],[1,0],[1,1],[1,2]],
      [[2,0],[0,1],[1,1],[2,1]],
      [[0,0],[0,1],[0,2],[1,2]],
    ],
    'J':[
      [[0,0],[1,0],[2,0],[2,1]],
      [[1,0],[1,1],[1,2],[0,2]],
      [[0,0],[0,1],[1,1],[2,1]],
      [[0,0],[1,0],[0,1],[0,2]],
    ],
    'Z':[
      [[0,0],[1,0],[1,1],[2,1]],
      [[1,0],[1,1],[0,1],[0,2]],
    ],
    'S':[
      [[1,0],[2,0],[0,1],[1,1]],
      [[0,0],[0,1],[1,1],[1,2]],
    ],
    'T':[
      [[0,0],[1,0],[2,0],[1,1]],
      [[1,-1],[1,0],[1,1],[0,0]],
      [[0,0],[1,0],[2,0],[1,-1]],
      [[1,-1],[1,0],[1,1],[2,0]],
    ],
    'O':[
      [[1,0],[2,0],[1,1],[2,1]],
    ],
  };

The code above has two sets of squares .( Matrix , No lift )
There is no direct connection between the two , They are two ideas derived from rotating squares .
The biggest difference between the two is , The rotation of the first group of matrix blocks needs to be converted by relevant algorithms , Relatively complex .
And the second group , We have enumerated the rotation results of U.S. and Chinese squares , Better to understand .
The first box option

let shapData = shaps['T']
  
  //  Rotate the matrix by algorithm 
  shapData = matirx2dRotation(shapData)
  const shapRender = (vector) => {
    //  It's a little different from enumeration 
  }

The second kind of square rotation

//  For example, the following code can be directly removed T One of the rotation data of the square 
  //  Each vector in this data plus the square offset in the scene of the block is the rendering data of the block 
  const shapData = enumShaps['T'][1]

  // vector  Offset ( It's the location of the square in the scene )
  const shapRender = (vector) => {
    return shapData.map(([x, y]) => [x + X, y + Y]);
  }

The above complete code is in the bottom warehouse address


Two 、 Collision and logic

The standard situation , Only one square in the scene receives player action .
The player's box is generated and handed over to the player after the game begins .

Player controlled squares , Every time the player operates feedback, the collision logic is detected .
The operation feedback here is mainly on the left side of the block 、 Right 、 Move down and rotate .

  • Whether the square overflows the scene ( The left and right sides of the scene collide with the bottom boundary )
  • Whether the square collides with the static square in the scene

Every game heartbeat interval , You also need to drop the block controlled by the current player by one space .

Whether it is the player's active block drop or the game heartbeat interval will automatically drop the box . We need to detect whether it collides with the bottom of the scene or other static squares .
If the collision holds up , Add the current block to the static block sequence .
At this point, you can execute the logic of the small block .
You need to fill the vacant position after playing the square .
Finally, a new box is generated and added to the scene .
As the new box enters the scene , You need to detect collisions with still squares immediately . If true, then the game is game over.

//  Block static logic 
  const isShapDead = vector => {
    // ... If true, it is added to the sequence of static squares 
  }

  //  Whether it overflows the scene 
  //  No need to detect the top 
  const isOverFlow = vectors => {
    const [width, height] = screenSize;
    return vectors.some(([x, y]) => {
      return x < 0 || x >= width || y >= height;
    });
  }

  //  Is there a collision 
  const isShapHit = vectors => {
    // ...
  }

  //  Whether the game fails 
  const isGameOver = data => {
  	//  Square initial position vector 
    const [, y] = vector;

    if (y <= 0 && isShapHit(data)) {
      return true;
    }
    return false;
  }

The above complete code is in the bottom warehouse address


3、 ... and 、 The rendering layer is separated from the logic layer

Every time the game beats , With every user action feedback will trigger rendering

Maybe it's been separating the front and back for some time , A little bit virtual dom A little bit of an impact on .
Redesigned code , Virtualize the whole process of the game .
Only in every heartbeat ( Similar to the concept of frames in the game ) Or the user will push the game virtual data to the rendering layer after each active operation , The rendering logic is implemented by the render layer .

// TetrisJS  The logic code of the whole game 
    const TJS = new TetrisJS({
      screenSize,
      intervals: 1000,
    });
    // update  To accept the push of the rendering request in the callback letter of 
    TJS.update(() => {
      // TJS.map It's the virtual data of the game 
      renderGame(TJS.map)
    });

	const renderGame = data => {
	  // render  Rendering logic 
	}

Finally, code the warehouse ( The above code is based on this )https://github.com/applelee/tetris-js.git
Old code ( Be careful )https://github.com/applelee/tetris-js-old.git

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