我写了这个画布动画脚本,希望能在我的投资组合网站上使用它,但是在Firefox中它基本上是不起作用的,我不确定为什么。该脚本在画布上绘制缓慢旋转的星星,如果按住鼠标按钮,它们将旋转得更快,从而创建轨迹。它在chrome浏览器中很棒,但是在Firefox中却非常慢且不稳定。
let canvas = document.querySelector('canvas');
let c = canvas.getContext('2d');
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
let mouse = {
x: window.innerWidth / 2,
y: window.innerHeight / 2
}
let stars = [];
const starCount = 800;
class Star {
constructor(x, y, radius, color){
this.x = x;
this.y = y;
this.radius = radius;
this.color = color;
this.draw = () => {
c.save();
c.beginPath();
c.arc(this.x, this.y, this.radius, 0, Math.PI * 2);
c.fillStyle = this.color;
c.shadowColor = this.color;
c.shadowBlur = 15;
c.fill();
c.closePath();
c.restore();
};
this.update = () => {
this.draw();
};
}
}
let colors = [
"#A751CC",
"#DE9AF9",
"#F9E0F9",
"#B5ECFB",
"#5F86F7"
];
(initializeStars = () =>{
for(let i = 0; i < starCount; i++){
let randomColorIndex = Math.floor(Math.random() * 5);
let randomRadius = Math.random() * 2;
let x = (Math.random() * (canvas.width + 400)) - (canvas.width + 400) / 2;
let y = (Math.random() * (canvas.width + 400)) - (canvas.width + 400) / 2;
stars.push(new Star(x, y, randomRadius, colors[randomColorIndex]));
}
})();
let opacity = 1;
let speed = 0.0005;
let time = 0;
let spinSpeed = desiredSpeed => {
speed += (desiredSpeed - speed) * 0.01;
time += speed;
return time;
}
let starOpacity = (desiredOpacity, ease) => {
opacity += (desiredOpacity - opacity) * ease;
return c.fillStyle = `rgba(18, 18, 18, ${opacity})`;
}
let animate = () => {
window.requestAnimationFrame(animate);
c.save();
if(mouseDown){
starOpacity(0.01, 0.03);
spinSpeed(0.012);
}else{
starOpacity(1, 0.01);
spinSpeed(0.001);
}
c.fillRect(0,0, canvas.width, canvas.height);
c.translate(canvas.width / 2, canvas.height / 2);
c.rotate(time);
for(let i = 0; i < stars.length; i++){
stars[i].update();
}
c.restore();
}
window.addEventListener('mousemove', e => {
mouse.x = e.clientX - canvas.width / 2;
mouse.y = e.clientY - canvas.height / 2;
});
window.addEventListener('resize', () => {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
stars = [];
initializeStars();
});
let mouseDown = false;
window.addEventListener("mousedown", () =>{
mouseDown = true;
});
window.addEventListener("mouseup", () => {
mouseDown = false;
});
animate();
这是Code Pen上的演示的link;任何帮助表示赞赏。
答案 0 :(得分:1)
您可以使用rect而不是arc来绘制星星:
c.rect(this.x,this.y,2 * this.radius,2 * this.radius);
消除模糊这是非常昂贵的:
// c.shadowBlur = 15;
您可以使用径向渐变,从中间的不透明代替他的透明。