打砖块

制作教程：2D breakout game using pure JavaScript 键盘左右方向键或鼠标控制，如果加载失败请多刷新几次页面

var canvas = document.getElementById("myCanvas");
var ctx = canvas.getContext("2d");
var ballRadius = 10;
var x = canvas.width/2;
var y = canvas.height-30;
var dx = 3;
var dy = -3;
var paddleHeight = 10;
var paddleWidth = 75;
var paddleX = (canvas.width-paddleWidth)/2;
var rightPressed = false;
var leftPressed = false;
var brickRowCount = 5;
var brickColumnCount = 3;
var brickWidth = 75;
var brickHeight = 20;
var brickPadding = 10;
var brickOffsetTop = 30;
var brickOffsetLeft = 30;
var score = 0;
var lives = 3;
var rafId;

var bricks = [];
for(var c=0; c<brickColumnCount; c++) {
    bricks[c] = [];
    for(var r=0; r<brickRowCount; r++) {
        bricks[c][r] = { x: 0, y: 0, status: 1 };
    }
}

document.addEventListener("keydown", keyDownHandler, false);
document.addEventListener("keyup", keyUpHandler, false);
document.addEventListener("mousemove", mouseMoveHandler, false);

function draw() {
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    drawBricks();
    drawBall();
    drawPaddle();
    drawScore();
    drawLives();
    if(collisionDetection() === 1){
        return;
    }

if(x + dx > canvas.width-ballRadius || x + dx < ballRadius) {
        dx = -dx;
    }
    if(y + dy < ballRadius) {
        dy = -dy;
    }
    else if(y + dy > canvas.height-ballRadius) {
        if(x > paddleX && x < paddleX + paddleWidth) {
            dy = -dy;
        }
        else {
            lives--;
            if(!lives) {
                alert("GAME OVER");
                cancelAnimationFrame(rafId);
                return;
            }
            else {
                x = canvas.width/2;
                y = canvas.height-30;
                dx = 3;
                dy = -3;
                paddleX = (canvas.width-paddleWidth)/2;
            }
        }
    }

if(rightPressed && paddleX < canvas.width-paddleWidth) {
        paddleX += 7;
    }
    else if(leftPressed && paddleX > 0) {
        paddleX -= 7;
    }

x += dx;
    y += dy;
    rafId = requestAnimationFrame(draw);
}

draw();

posted @ 2020-05-06 18:54 AdjWang 阅读(136) 评论(1) 收藏举报

刷新页面返回顶部

AdjWang

Perfection is achieved not when there is nothing more to add, but rather when there is nothing more to take away. -- Antoine de Saint-Exupéry

打砖块

公告