我正在尝试使球从右向左无限弹跳,但我无法使其正常工作。下面的代码使该球将向右再向左移动,但我无法使其再次向右弹回。有人有任何解决办法?
var speed = 3;
var ball = {
x: 100,
y: 200,
draw: function() {
fill('red');
circle(this.x, this.y, 100);
},
move: function(){
if(this.x > width){
speed = -3;
}
this.x = this.x + speed;
}
}
function setup() {
createCanvas(500, 500);
background(200, 225, 200);
}
function draw() {
background(200,225,200);
ball.draw();
ball.move();
}
附言这是我的第一篇文章,请告诉我是否做错了什么或需要添加任何内容。
最佳答案
如果球击中右侧(speed *= -1
)或击中左侧(this.x > width
),则必须反转运动方向(this.x < 0
):
let radius = 50;
if (this.x > width-radius || this.x < radius ) {
speed *= -1;
}
参见示例:
var speed = 3;
var ball = {
x: 100,
y: 200,
radius: 50,
draw: function() {
fill('red');
circle(this.x, this.y, this.radius*2);
},
move: function(){
if (this.x > width-this.radius || this.x < this.radius) {
speed *= -1;
}
this.x = this.x + speed;
}
}
function setup() {
createCanvas(500, 500);
background(200, 225, 200);
}
function draw() {
background(200,225,200);
ball.draw();
ball.move();
}
<script src="https://cdnjs.cloudflare.com/ajax/libs/p5.js/0.9.0/p5.js"></script>
关于javascript - P5-左右左右弹跳球,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/59646011/