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No:7831

2305

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The Mystery of Convoy
Developer User3788｜Date and time 23/7/10 0:27:12
Build time 11.688 sec｜Game capacity 3.027KB｜

Script

コンボイの謎

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Click here for free DL of the app version that can save data.

<!DOCTYPE html>
<html lang="ja">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Convoiの謎</title>
</head>
<body>
  <h1>コンボイの謎</h1>
  <canvas id="gameCanvas" width="400" height="600"></canvas>
  <script>
    // ゲームの開始処理
    window.onload = function() {
      const canvas = document.getElementById("gameCanvas");
      const context = canvas.getContext("2d");

const paddleWidth = 80;
      const paddleHeight = 10;
      const paddleX = (canvas.width - paddleWidth) / 2;
      const paddleY = canvas.height - paddleHeight - 10;
      let paddleSpeed = 6;
      
      const ballRadius = 10;
      let ballX = canvas.width / 2;
      let ballY = canvas.height - paddleHeight - ballRadius - 10;
      let ballSpeedX = 4;
      let ballSpeedY = -4;

let leftPressed = false;
      let rightPressed = false;

// キーボード操作のリスナー
      document.addEventListener("keydown", keyDownHandler, false);
      document.addEventListener("keyup", keyUpHandler, false);

function keyDownHandler(e) {
        if (e.key === "Right" || e.key === "ArrowRight") {
          rightPressed = true;
        } else if (e.key === "Left" || e.key === "ArrowLeft") {
          leftPressed = true;
        }
      }

function keyUpHandler(e) {
        if (e.key === "Right" || e.key === "ArrowRight") {
          rightPressed = false;
        } else if (e.key === "Left" || e.key === "ArrowLeft") {
          leftPressed = false;
        }
      }

function drawBall() {
        context.beginPath();
        context.arc(ballX, ballY, ballRadius, 0, Math.PI*2);
        context.fillStyle = "#0095DD";
        context.fill();
        context.closePath();
      }

function drawPaddle() {
        context.beginPath();
        context.rect(paddleX, paddleY, paddleWidth, paddleHeight);
        context.fillStyle = "#0095DD";
        context.fill();
        context.closePath();
      }

function draw() {
        context.clearRect(0, 0, canvas.width, canvas.height);
        
        drawBall();
        drawPaddle();

if (ballX + ballSpeedX > canvas.width - ballRadius || ballX + ballSpeedX < ballRadius) {
          ballSpeedX = -ballSpeedX;
        }
        if (ballY + ballSpeedY < ballRadius) {
          ballSpeedY = -ballSpeedY;
        } else if (ballY + ballSpeedY > canvas.height - ballRadius) {
          if (ballX > paddleX && ballX < paddleX + paddleWidth) {
            ballSpeedY = -ballSpeedY;
          } else {
            alert("ゲームオーバー");
            document.location.reload();
          }
        }

if (leftPressed && paddleX > 0) {
          paddleX -= paddleSpeed;
        } else if (rightPressed && paddleX < canvas.width - paddleWidth) {
          paddleX += paddleSpeed;
        }

ballX += ballSpeedX;
        ballY += ballSpeedY;

requestAnimationFrame(draw);
      }

draw();
    };
  </script>
</body>
</html>