| 187 | } |
| 188 | |
| 189 | updateDirection_(action) { |
| 190 | if (this.snakeDirection_ === 'l') { |
| 191 | if (action === ACTION_TURN_LEFT) { |
| 192 | this.snakeDirection_ = 'd'; |
| 193 | } else if (action === ACTION_TURN_RIGHT) { |
| 194 | this.snakeDirection_ = 'u'; |
| 195 | } |
| 196 | } else if (this.snakeDirection_ === 'u') { |
| 197 | if (action === ACTION_TURN_LEFT) { |
| 198 | this.snakeDirection_ = 'l'; |
| 199 | } else if (action === ACTION_TURN_RIGHT) { |
| 200 | this.snakeDirection_ = 'r'; |
| 201 | } |
| 202 | } else if (this.snakeDirection_ === 'r') { |
| 203 | if (action === ACTION_TURN_LEFT) { |
| 204 | this.snakeDirection_ = 'u'; |
| 205 | } else if (action === ACTION_TURN_RIGHT) { |
| 206 | this.snakeDirection_ = 'd'; |
| 207 | } |
| 208 | } else if (this.snakeDirection_ === 'd') { |
| 209 | if (action === ACTION_TURN_LEFT) { |
| 210 | this.snakeDirection_ = 'r'; |
| 211 | } else if (action === ACTION_TURN_RIGHT) { |
| 212 | this.snakeDirection_ = 'l'; |
| 213 | } |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | /** |
| 218 | * Get the current direction of the snake. |