Initial commit

2024-01-13 18:20:27 +01:00
commit 4265d64e57
57 changed files with 1623 additions and 0 deletions
--- a/404_games/snake/js/logic.js
+++ b/404_games/snake/js/logic.js
@@ -0,0 +1,140 @@
+var BLOCK_SIZE = 16;
+
+function update(){
+  if (GAME_STATE.complete)	GAME_STATE.snake.update();
+}
+
+function initGameState(callback){
+  GAME_STATE.grid = {};
+  loadImagePixels("data/map.png", function(rows){
+    rows.forEach(function(row, i){
+      row.forEach(function(pixel, j){
+        var cell = new Cell(i,j);
+        if (isColor(pixel, BLACK))
+          cell.content = 'BLOCK';
+        else if (isColor(pixel, GREEN))
+          cell.content = 'INVALID';
+        else if (isColor(pixel, RED)){
+          cell.content = 'SNAKE';
+          GAME_STATE.snake = new Snake(cell);
+        }
+        GAME_STATE.grid[[i,j]] = cell;
+        GAME_STATE.gameHeight = i;
+        GAME_STATE.gameWidth = j;
+      });
+    });
+    Grid.newFood();
+    GAME_STATE.complete = true;
+    callback();
+  });
+}
+
+var GAME_STATE = {
+  snake: null,
+  grid: null,
+  gameOver: false,
+  gameHeight: 0,
+  gameWidth: 0,
+}
+
+function Grid(){}
+
+Grid.get = function(x,y){
+  return GAME_STATE.grid[[x,y]];
+}
+
+Grid.set = function(x, y, content){
+  var cell = GAME_STATE.grid[[x,y]];
+  cell.content = content;
+  return cell;
+}
+
+Grid.unset = function(x, y){
+  var cell = GAME_STATE.grid[[x,y]];
+  cell.content = null;
+  return cell;
+}
+
+Grid.randomFree = function(){
+  do{
+    var row = Math.floor(Math.random() * GAME_STATE.gameHeight);
+    var col = Math.floor(Math.random() * GAME_STATE.gameWidth);
+    var cell = this.get(row,col);
+  } while (cell.content);
+  return cell;
+}
+
+Grid.newFood = function (){
+  var freeCell = this.randomFree();
+  freeCell.content = 'FOOD';
+}
+
+function Cell(x,y){
+  this.x = x;
+  this.y = y;
+  this.content = null;
+}
+
+
+function Snake(initCell){
+  this.body = [initCell];
+  this.dir = {x: -1, y: 0};  // start moving to the left
+}
+
+Snake.prototype.head = function(){
+  return this.body[0];
+}
+
+Snake.prototype.tail = function(){
+  return this.body[-1];
+}
+
+Snake.prototype.move = function(dir){
+  switch(dir){
+    case 'l':
+      this.dir = {x: -1, y: 0};
+      break;
+    case 'r':
+      this.dir = {x: 1, y: 0};
+      break;
+    case 'u':
+      this.dir = {x: 0, y: -1};
+      break;
+    case 'd':
+      this.dir = {x: 0, y: 1};
+      break;
+  }
+}
+
+Snake.prototype.update = function(dir){
+  // compute new position of the head
+  var head = this.head();
+  var dir = this.dir;
+  var newX = head.x + dir.x;
+  var newY = head.y + dir.y;
+  var newHead = Grid.get(newX, newY);
+
+  // check collisions
+
+  // if food, grow (on the head)
+  if (newHead.content == 'FOOD') {
+    newHead.content = 'SNAKE';
+    this.body.unshift(newHead);
+    Grid.newFood();
+  }
+
+  // if block, die
+  else if (newHead.content != null){
+    GAME_STATE.game_over = true;
+  }
+
+  // else, move
+  else {
+    oldTail = this.body.pop();
+    oldTail.content = null;
+
+    newHead.content = 'SNAKE';
+    this.body.unshift(newHead);
+  }
+
+}