使用边缘 Java 进行碰撞检测

Question

我正在尝试使用 4 张代表步行者的图像添加边缘碰撞检测。一旦图像撞到墙上，它应该反转并向另一个方向移动，直到它撞到墙并再次反转方向。我该怎么做？这是我到目前为止的代码：

class Walker {
int x = 0;
int y;
int speed;
PImage img1, img2, img3, img4;
int count = 0;
Walker(int y, int speed) {
this.y = y;
img1 = loadImage("walk1.gif");
img2 = loadImage("walk2.gif");
img3 = loadImage("walk3.gif");
img4 = loadImage("walk4.gif");
this.speed = speed;
}
void render() {
if (count < 10)
image(img1, x, y);
else if (count < 20)
image(img2, x, y);
else if (count < 30)
image(img3, x, y);
else if (count < 40)
image(img4, x, y);
else {
count = -1;
}
count++;
}
void move() {
x = x + speed;
}
}

Walker walter;
void setup() {
size(500, 500);
walter = new Walker(150, 3);
}
void draw() {
background(125);
walter.render();
walter.move();
}

Answer 1

当步行者撞到墙上时，你必须逆转速度。PImage的宽度由属性给出，.width例如：

class Walker {
// [...]
void move()
{
x = x + speed;
int man_width = img1.width; 
if (x <= 0 || x >= width-man_width)
speed = -speed;
}
}