0
动画球试图以动画球,与在画布上的间隔不能在画布上
做球出现在每个N *秒出现,但我不能让他们动:C
我“M做错了
https://jsbin.com/mexofuz/26/edit?js,output
function Ball(){
this.X = 50;
this.Y = 50;
this.radius = Math.floor(Math.random()*(30-10)+10);
this.color = getRandomColor();
this.dx = Math.floor(Math.random()*(20-10)+10);
this.dy = Math.floor(Math.random()*(20-10)+10);
}
Ball.prototype.draw = function(){
context.fillStyle = this.color;
context.beginPath();
context.arc(this.X, this.Y, this.radius, 0, Math.PI*2, true);
context.closePath();
context.fill();
}
Ball.prototype.animate = function(){
if(this.X<0 || this.X>(w-this.radius)) this.dx=-this.dx;
if(this.Y<0 || this.Y>(h-this.radius)) this.dy=-this.dy;
this.X+=this.dx;
this.Y+=this.dy;
}
var balls = [];
function render() {
context.fillStyle = "white";
context.fillRect(0, 0, w, h);
for(var i = 1;i<=20;i++){
balls[i] = new Ball();
setTimeout(Ball.prototype.draw.bind(this.balls[i]), 5000 * i);
// Ball.prototype.animate.bind(this.balls[i]);
if (balls[i].X < 0 || balls[i].X > w-balls[i].radius) {
balls[i].dx = -balls[i].dx;
}
if (balls[i].Y < 0 || balls[i].Y > h-balls[i].radius) {
balls[i].dy = -balls[i].dy;
}
balls[i].x += balls[i].dx
balls[i].y += balls[i].dy
}
console.log(balls);
}
render();
因为每次循环渲染时,都会再次从头创建所有球。尝试移动'球[我] =新球();'*外渲染'* –
你期待发生什么 - 球反弹?你没有事件循环,每5秒钟超时。你需要每秒处理几次(30次左右= 30fps)。作为一个例子来看看http://www.playmycode.com/blog/2011/08/building-a-game-mainloop-in-javascript/ –