Day 2 — Moving Pacman

Students add Pacman with arrow key movement, wall collision, pellet eating, and a mouth animation using arc().

// ════════════════════════════════════════════════════════════
//  DAY 2 — Moving Pacman
//  Adds: Pacman sprite, arrow key movement, wall collision,
//        pellet eating, score, mouth animation
// ════════════════════════════════════════════════════════════

const TILE_SIZE = 20;
const COLS      = 21;
const ROWS      = 21;
const PATH = 0, WALL = 1, PELLET = 2, POWER = 3;

let maze = [
  [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
  [1,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2,1],
  [1,2,1,1,2,1,1,1,1,2,1,2,1,1,1,1,2,1,1,2,1],
  [1,3,1,1,2,1,1,1,1,2,1,2,1,1,1,1,2,1,1,3,1],
  [1,2,1,1,2,2,2,1,1,2,2,2,1,1,2,2,2,1,1,2,1],
  [1,2,1,1,1,1,2,1,1,1,1,1,1,1,2,1,1,1,1,2,1],
  [1,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2,1],
  [1,1,1,1,2,1,1,1,0,0,1,0,0,1,1,1,2,1,1,1,1],
  [1,1,1,1,2,1,0,0,0,0,1,0,0,0,0,1,2,1,1,1,1],
  [1,1,1,1,2,1,0,1,1,0,0,0,1,1,0,1,2,1,1,1,1],
  [1,2,2,2,2,0,0,1,0,0,0,0,0,1,0,0,2,2,2,2,1],
  [1,1,1,1,2,1,0,1,1,1,1,1,1,1,0,1,2,1,1,1,1],
  [1,1,1,1,2,1,0,0,0,0,1,0,0,0,0,1,2,1,1,1,1],
  [1,1,1,1,2,1,1,1,0,0,1,0,0,1,1,1,2,1,1,1,1],
  [1,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2,1],
  [1,2,1,1,1,1,2,1,1,1,1,1,1,1,2,1,1,1,1,2,1],
  [1,2,1,1,2,2,2,1,1,2,2,2,1,1,2,2,2,1,1,2,1],
  [1,3,1,1,2,1,1,1,1,2,1,2,1,1,1,1,2,1,1,3,1],
  [1,2,1,1,2,1,1,1,1,2,1,2,1,1,1,1,2,1,1,2,1],
  [1,2,2,2,2,2,2,2,2,2,1,2,2,2,2,2,2,2,2,2,1],
  [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
];

// NEW: Pacman state
let pacRow = 16, pacCol = 10;
let pacDir = 0;           // 0=right, 90=down, 180=left, 270=up
let mouthAngle = 0;
let mouthOpen  = true;
let score = 0;

function setup() {
  createCanvas(COLS * TILE_SIZE, ROWS * TILE_SIZE);
  frameRate(60);
  noSmooth();
}

function draw() {
  background(0);
  drawMaze();
  animateMouth();   // NEW
  drawPacman();     // NEW
  drawScore();      // NEW
}

function drawMaze() {
  for (let row = 0; row < ROWS; row++) {
    for (let col = 0; col < COLS; col++) {
      let cell = maze[row][col];
      let x = col * TILE_SIZE, y = row * TILE_SIZE;
      if (cell === WALL) {
        fill(0, 0, 180); noStroke(); rect(x, y, TILE_SIZE, TILE_SIZE);
      } else if (cell === PELLET) {
        fill(0); rect(x, y, TILE_SIZE, TILE_SIZE);
        fill(255, 255, 200); noStroke();
        circle(x + TILE_SIZE/2, y + TILE_SIZE/2, 4);
      } else if (cell === POWER) {
        fill(0); rect(x, y, TILE_SIZE, TILE_SIZE);
        fill(255, 180, 0); noStroke();
        circle(x + TILE_SIZE/2, y + TILE_SIZE/2, 12);
      } else {
        fill(0); rect(x, y, TILE_SIZE, TILE_SIZE);
      }
    }
  }
}

// NEW: oscillates mouth between 0 and 40 degrees
function animateMouth() {
  if (mouthOpen) { mouthAngle += 4; if (mouthAngle >= 40) mouthOpen = false; }
  else           { mouthAngle -= 4; if (mouthAngle <= 0)  mouthOpen = true;  }
}

// NEW: draws Pacman as a pie/wedge using arc()
function drawPacman() {
  let x = pacCol * TILE_SIZE + TILE_SIZE / 2;
  let y = pacRow * TILE_SIZE + TILE_SIZE / 2;
  fill(255, 220, 0); noStroke();
  arc(x, y, TILE_SIZE - 2, TILE_SIZE - 2,
    radians(pacDir + mouthAngle),
    radians(pacDir + 360 - mouthAngle),
    PIE
  );
}

function drawScore() {
  fill(255); noStroke(); textSize(12); textAlign(LEFT, TOP);
  text('SCORE: ' + score, 6, 4);
}

// NEW: move on arrow key press, check wall, eat pellet
function keyPressed() {
  let nextRow = pacRow, nextCol = pacCol;
  if (keyCode === UP_ARROW)    { nextRow -= 1; pacDir = 270; }
  if (keyCode === DOWN_ARROW)  { nextRow += 1; pacDir = 90;  }
  if (keyCode === LEFT_ARROW)  { nextCol -= 1; pacDir = 180; }
  if (keyCode === RIGHT_ARROW) { nextCol += 1; pacDir = 0;   }

  if (maze[nextRow][nextCol] !== WALL) {
    pacRow = nextRow; pacCol = nextCol;
    if (maze[pacRow][pacCol] === PELLET) {
      maze[pacRow][pacCol] = PATH; score += 10;
    } else if (maze[pacRow][pacCol] === POWER) {
      maze[pacRow][pacCol] = PATH; score += 50;
    }
  }
}