if(ball.x>=1024-ball.r){
vall.x=1024-ball.r;
ball.vx=-ball.vx;
}
为何没效果呢？如果我要左右两边缘都有碰撞检测效果呢？
if(ball.y >= 600-ball.r){
ball.y=600-ball.r;
ball.vy = -ball.vy;
}
if(ball.y<=ball.r){
ball.y=ball.r;
ball.vy=-ball.vy;
}
if(ball.x<=ball.r){
ball.x=ball.r;
ball.vx=-ball.vx;
}
if(ball.x>= 1100 -ball.r){
ball.x=1100 -ball.r;
ball.vx=-ball.vx;
}这么久过去了不知道你的问题有没有解决，我就是这样写的啊 对着呢
//左边缘碰撞返回
if(ball.x<=ball.r){
ball.x=ball.r;
ball.vx=-ball.vx;
}
//右边缘碰撞返回
if(ball.x>=1024-ball.r){
ball.x=1024-ball.r;
ball.vx=-ball.vx;
}
//上边缘碰撞返回
if(ball.y<=ball.r){
ball.y=ball.r;
ball.vy=-ball.vy*0.9;
}
if(ball.x>=1024-ball.r){
ball.x=1024-ball.r;
ball.vx=-ball.vx;
}