色婷婷狠狠18禁久久YY,CHINESE性内射高清国产,国产女人18毛片水真多1,国产AV在线观看

html 5重力圖片源代碼

傅智翔2年前8瀏覽0評論

HTML 5 重力圖片源代碼是一種HTML語言的標簽和屬性組合,它能夠實現圖片的重力和運動效果,可以為網站的視覺效果以及用戶交互性帶來一些新的體驗。

<!DOCTYPE html>
<html>
<head>
<title>HTML 5 重力圖片示例</title>
<meta charset="UTF-8">
<style>
canvas {
border: solid 1px #333;
}
</style>
</head>
<body>
<canvas id="canvas" width="800" height="600"></canvas>
<script>
var canvas = document.getElementById('canvas');
var context = canvas.getContext('2d');
window.requestAnimationFrame = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame;
function Particle(x, y, radius) {
this.x = x;
this.y = y;
this.radius = radius;
this.color = 'rgb(' + Math.floor(Math.random() * 255) + ',' + Math.floor(Math.random() * 255) + ',' + Math.floor(Math.random()*255) + ')';
this.vx = Math.random() * 10 - 5;
this.vy = Math.random() * 10 - 5;
}
Particle.prototype.move = function() {
this.x += this.vx;
this.y += this.vy;
};
Particle.prototype.draw = function() {
context.beginPath();
context.arc(this.x, this.y, this.radius, 0, Math.PI * 2, true);
context.closePath();
context.fillStyle = this.color;
context.fill();
};
Particle.prototype.checkCollision = function() {
if (this.x - this.radius < 0) {
this.x = this.radius;
this.vx *= -1;
}
if (this.x + this.radius > canvas.width) {
this.x = canvas.width - this.radius;
this.vx *= -1;
}
if (this.y - this.radius < 0) {
this.y = this.radius;
this.vy *= -1;
}
if (this.y + this.radius > canvas.height) {
this.y = canvas.height - this.radius;
this.vy *= -1;
}
};
var particles = [];
for (var i = 0; i < 20; i++) {
particles.push(new Particle(Math.random() * canvas.width, Math.random() * canvas.height, Math.random() * 20));
}
function animate() {
context.clearRect(0, 0, canvas.width, canvas.height);
for (var i = 0; i < particles.length; i++) {
particles[i].draw();
particles[i].move();
particles[i].checkCollision();
}
requestAnimationFrame(animate);
}
animate();
</script>
</body>
</html>

上述代碼展示了一個基本的重力圖片運動的動畫,其中包含了一個名為Particle的構造函數,用于創建粒子對象。通過對粒子對象的vx和vy值來控制粒子的運動方向和速度,并在每一幀中進行碰撞檢測,來實現物理效果。此外,還使用了HTML 5中的Canvas標簽和Web Animation API的requestAnimationFrame函數來實現動畫效果。