New update for Week2

src/game/index.js

+const BACKGROUND_COLOR = '#27ae60';
+const SNAKE_COLOR = '#3498db';
+const FOOD_COLOR = '#e74c3c';
+
+const gameScreen = document.getElementById('gameScreen');
+
+let canvas, element;
+
+//Given a position of snake/food (Will be changed in the future to handle multiplayer/randomness)
+const gameState = {
+  player: {
+    //Give a temporary position for the snake head
+    headPosition: {
+      x: 3,
+      y: 10,
+    },
+    //Give a temporary speed
+    velocity: {
+      x: 1,
+      y: 0,
+    },
+    //Give a temporary position of the snake body 
+    snake: [
+        {x: 2, y: 10},
+        {x: 3, y: 10},
+    ],
+  },
+  //Give a temporary position for the food, we will change it later to a random position
+  food: {
+    x: 7,
+    y: 7,
+  },
+  //Initialize the gridesize
+  gridsize: 20,
+};
+
+//Initialize the game elements such as canvas size, color, etc.
+function init(){
+  canvas = document.createElement('canvas');
+  element = canvas.getContext('2d');
+  canvas.width = 600;
+  canvas.height = 600;
+  
+  element.fillStyle = BACKGROUND_COLOR;
+  element.fillRect(0, 0, canvas.width, canvas.height);
+
+  gameScreen.appendChild(canvas);
+  
+  document.addEventListener('keydown', keydown);
+}
+
+//Here is where we will implement movement/direction logic. The server is not implemented yet so we just use console.log(event.keyCode) to represent keys pressed
+function keydown(event){
+  console.log(event.keyCode);
+}
+
+init();
+
+//Change background color, initilize game screen size, and place a food object at a set position
+function paintGame(state) {
+  element.fillstyle = BACKGROUND_COLOR;
+  element.fillRect(0, 0, canvas.width, canvas.height);
+
+  const food = state.food;
+  const gridsize = state.gridsize;
+  const size = canvas.width / gridsize;
+
+  element.fillStyle = FOOD_COLOR;
+  element.fillRect(food.x * size, food.y * size, size, size);
+
+  paintPlayer(state.player, size, SNAKE_COLOR);
+}
+
+//Change snake cell color (All elements in the snake length)
+function paintPlayer(playerState, size, color){
+  const snake = playerState.snake;
+
+  element.fillStyle = color;
+  for(let cell of snake){
+    element.fillRect(cell.x * size, cell.y * size, size, size);
+  }
+}
+
+paintGame(gameState);
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