摆动Java弹跳球移动

Question

我有个问题。 我不想让球从鼠标指针上逃脱。 当鼠标指针进入屏幕时，所有球都会转到左角。 我做错了什么？有什么建议吗

我的完整代码： Java BounceBall mouse event

或

http://ideone.com/vTGzb7

有问题的方法：

public void move(Ball ball, Point mouse) {

    try {
        Point p = ball.getLocation();
        Point speed = ball.getSpeed();
        Dimension size = ball.getSize();

        int vx = speed.x;
        int vy = speed.y;

        int x = p.x;
        int y = p.y;

        // ----------------------
        if (mouse != null) {

            int xDistance = Math.abs(x + size.width - mouse.x);
            int yDistance = Math.abs(y + size.height - mouse.y);

            if (xDistance < yDistance) {
                if (x + size.width < mouse.x) {
                    if (vx > 0) {
                        vx *= -1;
                    }
                } else {
                    if (vx > 0) {
                        vx *= -1;
                    }
                }
            } else {
                if (y + size.height < mouse.y) {
                    if (vy > 0) {
                        vy *= -1;
                    }
                } else {
                    if (vy > 0) {
                        vy *= -1;
                    }
                }
            }

        }
        // ----------------------

        if (x + vx < 0 || x + size.width + vx > getParent().getWidth()) {
            vx *= -1;
        }
        if (y + vy < 0
                || y + size.height + vy > getParent().getHeight()) {
            vy *= -1;
        }
        x += vx;
        y += vy;

        ball.setSpeed(new Point(vx, vy));
        ball.setLocation(new Point(x, y));

    } catch (Exception e) {
        e.printStackTrace();
    }

}

对于一些球来说，它很好用。 他们击中鼠标指针并改变你的方向。 但大多数人都走到了屏幕的角落

多谢各位

Answer 1

问题解决了

问题：气泡被锁定在屏幕的上角。不要点击鼠标指针

解决方案：我计算了X和Y位置相对于气泡直径和鼠标指针的距离。为了碰撞

int xDistance = Math.abs((x + (diameter / 2)) - mouse.x);
int yDistance = Math.abs((y + (diameter / 2)) - mouse.y);

然后计算气泡的X和Y半径

int radiusX = (size.width / 2);
int radiusY = (size.height / 2);

最后，我更改了IF以检查气泡半径距离之间的关系。改变你的方向

if (xDistance <= radiusX && yDistance <= radiusY) {
    if (xDistance < yDistance) {
        vx *= -1;
    } else {
        vy *= -1;
    }

    System.out.println("Hit!");
}

新的移动方法：

public void move(Ball ball, Point mouse) {

    try {
        Point p = ball.getLocation();
        Point speed = ball.getSpeed();
        Dimension size = ball.getSize();

        int diameter = ball.dimeter;

        int vx = speed.x;
        int vy = speed.y;

        int x = p.x;
        int y = p.y;

        int radiusX = (size.width / 2);
        int radiusY = (size.height / 2);

        //            

        if (mouse != null) {
            int xDistance = Math.abs((x + (diameter / 2)) - mouse.x);
            int yDistance = Math.abs((y + (diameter / 2)) - mouse.y);

            System.out.printf("b(%d, %d) m(%d, %d) dx(%d, %d)\n", x, y,
                    mouse.x, mouse.y, (x + vx) - mouse.x, (y + vy)
                            - mouse.y);

            if (xDistance <= radiusX && yDistance <= radiusY) {

                if (xDistance < yDistance) {
                    vx *= -1;
                } else {
                    vy *= -1;
                }

                System.out.println("Hit");
            }
        }

        if (x + vx < 0 || x + size.width + vx > getParent().getWidth()) {
            vx *= -1;
        }
        if (y + vy < 0
                || y + size.height + vy > getParent().getHeight()) {
            vy *= -1;
        }

        x += vx;
        y += vy;

        ball.setSpeed(new Point(vx, vy));
        ball.setLocation(new Point(x, y));

    } catch (Exception e) {
        e.printStackTrace();
    }
}