“堆箱子”小游戏, 升级中 …
<html>
<body>
<canvas id="myCanvas" width="800" height="600"></canvas>
<script>
let canvas = document.getElementById("myCanvas");
let context = canvas.getContext("2d");
context.font = 'bold 30px sans-serif';
let scrollCounter, cameraY, current, mode, xSpeed;
let ySpeed = 5;
let height = 50;
let boxes = [];
boxes[0] = {
x: 300,
y: 300,
width: 200
};
let debris = {
x: 0,
width: 0
};
function newBox() {
boxes[current] = {
x: 0,
y: (current + 10) * height,
width: boxes[current - 1].width
};
}
function gameOver() {
mode = 'gameOver';
context.fillText('Game over. Click to play again!', 50, 50);
}
function animate() {
if (mode != 'gameOver') {
context.clearRect(0, 0, canvas.width, canvas.height);
context.fillText('Score: ' + (current - 1).toString(), 100, 200);
for (let n = 0; n < boxes.length; n++) {
let box = boxes[n];
context.fillStyle = 'rgb(' + n * 16 + ',' + n * 16 + ',' + n * 16 + ')';
context.fillRect(box.x, 600 - box.y + cameraY, box.width, height);
}
context.fillStyle = 'red';
context.fillRect(debris.x, 600 - debris.y + cameraY, debris.width, height);
if (mode == 'bounce') {
boxes[current].x = boxes[current].x + xSpeed;
if (xSpeed > 0 && boxes[current].x + boxes[current].width > canvas.width)
xSpeed = -xSpeed;
if (xSpeed < 0 && boxes[current].x < 0)
xSpeed = -xSpeed;
}
if (mode == 'fall') {
boxes[current].y = boxes[current].y - ySpeed;
if (boxes[current].y == boxes[current - 1].y + height) {
mode = 'bounce';
let difference = boxes[current].x - boxes[current - 1].x;
if (Math.abs(difference) >= boxes[current].width) {
gameOver();
}
debris = {
y: boxes[current].y,
width: difference
};
if (boxes[current].x > boxes[current - 1].x) {
boxes[current].width = boxes[current].width - difference;
debris.x = boxes[current].x + boxes[current].width;
} else {
debris.x = boxes[current].x - difference;
boxes[current].width = boxes[current].width + difference;
boxes[current].x = boxes[current - 1].x;
}
if (xSpeed > 0)
xSpeed++;
else
xSpeed--;
current++;
scrollCounter = height;
newBox();
}
}
debris.y = debris.y - ySpeed;
if (scrollCounter) {
cameraY++;
scrollCounter--;
}
}
window.requestAnimationFrame(animate);
}
function restart() {
boxes.splice(1, boxes.length - 1);
mode = 'bounce';
cameraY = 0;
scrollCounter = 0;
xSpeed = 2;
current = 1;
newBox();
debris.y = 0;
}
canvas.onpointerdown = function() {
if (mode == 'gameOver')
restart();
else {
if (mode == 'bounce')
mode = 'fall';
}
};
restart();
animate();
</script>
</body>
</html>