Code parsing for js push box games and js push box games

Source: Internet
Author: User
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Code parsing for js push box games and js push box games

Everyone has played the box pushing game. The reason why I wrote this article is that this game is simple enough to understand.

Demo:

Step analysis:

The code in this article has been put on github, and detailed code annotations are also carried out. You can copy the code and run it locally.

1. rendering a map

Html structure:

The html structure is very simple. You only need to get a bunch of divs to place the map class. Here I initialized 12*9 Divs, with a maximum of nine lines of height in the map.
These divs are of the same size, and the difference between map rendering is only the difference in color.

Map functions:

Var box = $ ('. box div '); // The div set used by the map function create () {// create a map function box. each (function (index) {// The number of indexes is fixed, which is the number of divs under the box div. // each time a map is created, the div box is initialized. eq (index ). removeClass () ;}); box. each (function (index, element) {// Number of the entire div in a loop. The number of two-dimensional arrays is insufficient. The default value is blank. // The level is the number of levels. The builder of the map is a two-dimensional array based on the level rendering, filter 0 boxes for map level if (builder [level] [index. eq (index ). addClass ('type' + builder [level] [index]) ;}}); box. eq (origin [level]). addClass ("pusher"); // push box person Pikachu location} // The first level of map length (the following is only a chestnut, not a code), 0 indicates that the area cannot be reached, 1 indicates the target (the place to be pushed), // 2 indicates the normal path (which can be taken), 3 indicates the wall, and 4 indicates the box [0, 0, 0, 3, 3, 0,,, 0, 3, 3, 0, 0, 0]

2. Capture Keyboard Events and determine whether to move
Use the $ (document). keydown () jqery event to capture Keyboard Events.

Capture Keyboard Events, top, bottom, right, and wsad.

$ (Document ). keydown (function (e) {var key = e. which; switch (key) {// col value is 12, up and down need 12 div for a cycle // direction key or w case 87: case 38: move (-col); // determines the moving function break; // The direction key or s case 83: case 40: move (col); break; // left or a case 65: case 37: move (-1); break; // right or d case 68: case 39: move (1); break ;} setTimeout (win, 500); // call the key to determine whether to pass the call });

Determine whether it can be moved.
There are two judgment conditions: one is to push the box, and the other is not to push the box, otherwise it will not move Pikachu.

Function move (step) {// whether to move judgment // There are two judgment conditions: Push box, and move without pushing box. Otherwise, do not move Pikachu // step up and down is a cycle of 12 Divs, and the left and right is a div positin, which is the original position of Pikachu var pikaqiu1 = box. eq (position); // The current location var pikaqiu2 = box. eq (position + step); // the next place Pikachu is going to var pushBox = box. eq (position + step * 2); // the next place where the box is going if (! Pikaqiu2.hasClass ('type4') & (pikaqiu2.hasClass ('type1') | pikaqiu2.hasClass ('type2') {// natural movement // judgment: if the class of the next div does not contain type4 (box), and the next div contains type1 (target position), or type2 (normal path) // The reason for determining whether type4 exists in this step and next step is that the normal path will change to a path with type4. At this time, the problem may occur pikaqiu1.removeClass ("pusher "); // remove the current pikaqiu2.addClass ("pusher"); // move Pikachu to the next position = position + step; // Add position value} else if (pikaqiu2.hasClass ('type4 '))&&(! PushBox. hasClass ('type4') & (pushBox. hasClass ('type1') | pushBox. hasClass ('type2') {// push box // if the next div class contains type4 (box) and does not contain overlapped type4 (box) and contains class type1 (target position) or include type2 (empty path) pikaqiu2.removeClass ('type4'); // remove the current box pikaqiu1.removeClass ("pusher"); // remove the current Pikachu pushBox. addClass ('type4'); // move the box to the next position pikaqiu2.addClass ("pusher "). addClass ("type2"); // After type4 is removed, there is no class here and it must be changed to normal path position = position + step; // Add position value }}

3. Victory judgment:
Each move calls this victory judgment.

Function win () {// victory condition judgment if ($ (". type1.type4 "). length = goal) {// compare the number of boxes that are pushed with the number of boxes set by the level. if (level <9) {alert ("666, challenge the next level-OBKoro1 "); level ++; // level + 1 goal = goalList [level]; position = origin [level]; create ();} else {alert ("awesome, great customs clearance ");}}}

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