java - Java朝着老鼠射击

我有一个自上而下的2D游戏，您可以四处射击坏人。我希望能够朝着鼠标射击，而不管它是什么方向，但是我绝对不知道如何做到这一点。

这是我的bullet课：

public class bullet {

public double x, y,dy,dx,mx,my;
public int dir;

public Rectangle r = new Rectangle((int) x, (int) y, 5, 5);

public bullet(double x, double y) {
    this.x = x+10;
    this.y = y+10;
    this.mx = Comp.mx;
    this.my = Comp.my;
    r = new Rectangle((int) x, (int) y, 5, 5);
    if (x < mx+play.camx) {
        dx = 1;
    }
    if (x > mx+play.camx) {
        dx = -1;
    }
    if (y < my+play.camy) {
        dy = 1;
    }
    if (y > my+play.camy) {
        dy = -1;
    }
}

public void tick() {
    x+=dx;
    y+=dy;

    r = new Rectangle((int) x - play.camx, (int) y - play.camy, 5, 5);
}

public void render(Graphics g) {
    g.setColor(Color.black);
    g.fillRect((int) x - play.camx, (int) y - play.camy, 5, 5);
}
}

最佳答案

基本上，您需要计算起点和终点之间的角度，例如...

angle = -Math.toDegrees(Math.atan2(startX - endX, startY - endY)) + 180;

举个例子：


Rotating a triangle around a point java
Java make a directed line and make it move
mouse motion listener only in one direction
Java: Move image towards mouse position


要跟踪鼠标，请使用MouseListener和MouseMotionListerner

看一眼：


How to write a MouseListener
How to write a MouseMotionListener

关于java - Java朝着老鼠射击，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/27554412/