我创建了一个简单的move()原型，其中包含vy和function Ball(radius,x,y,vx,vy,color){
this.radius = radius;
this.x = x;
this.y = y;
this.vx = vx;
this.vy = vy;
this.color = color;
this.gravity = 0.6;
this.friction = {
air: 0.005,
bounce: 0.3
};
}
Ball.prototype.move = function(){
this.x += this.vx;
this.y += this.vy;
//Gravity
this.vy += this.gravity;
//Air Friction
this.vx /= 1+this.friction.air;
this.vy /= 1+this.friction.air;
//Bounce Border
if(this.x<this.radius){//Left
this.x = this.radius+((this.radius-this.x)/(1+this.friction.bounce));
this.vx /= -(1+this.friction.bounce);
}
if(this.x>width-this.radius){//Right
this.x = (width-this.radius)-((this.x-(width-this.radius))/(1+this.friction.bounce));
this.vx /= -(1+this.friction.bounce);
}
if(this.y<this.radius){//Top
this.y = this.radius+((this.radius-this.y)/(1+this.friction.bounce));
this.vy /= -(1+this.friction.bounce);
}
if(this.y>height-this.radius){//Bottom
this.y = (height-this.radius)-((this.y-(height-this.radius))/(1+this.friction.bounce));
this.vy /= -(1+this.friction.bounce);
}
};
Ball.prototype.draw = function(){
ctx.beginPath();
ctx.arc(this.x,this.y,this.radius,0,2*Math.PI,false);
ctx.fillStyle = this.color;
ctx.fill();
};
var ctx, clock, ball
width = 300,
height = 150;
window.onload = function(){
ball = new Ball(20,150,30,4,0,"red");
var canvas = document.getElementById('canvas');
canvas.width = width;
canvas.height = height;
ctx = canvas.getContext('2d');
clock = setInterval(main,33);
};
function main(){
ctx.clearRect(0,0,width,height);
ball.draw();
ball.move();
}函数。球应该在地板，墙壁和天花板上反弹。然而，出于某种原因，虽然速度（canvas{
background-color: black;
}）不断下降，但它并没有停止弹跳......你知道我做错了什么吗？
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Bouncy Balls</title>
<link rel="stylesheet" href="style.css">
<script src="ball.class.js"></script>
<script src="script.js"></script>
</head>
<body>
<div align="center">
<canvas id="canvas"></canvas>
</div>
</body>
</html>def a():
print(x)
def b():
global x
x = 1
a()
b()
pd.merge(df1.reset_index(), df2.reset_index(),on='a', how='outer').set_index(['a','b'])
c d
a b
1 1.0 1.0 11
2.0 3.0 11
2 1.0 2.0 12
3 NaN NaN 13
答案 0 :(得分：1)
我认为你的问题是，当你的球反弹时，它仍会在整个嘀嗒声中向下加速，并且因为它会比它应该反弹得更远。
编辑： 因此，这只是y方向的问题。