Java向鼠标射击

Question

我有一款自上而下的 2D 游戏，你可以四处走动射击坏人。我希望能够向鼠标射击，无论它朝哪个方向，但我完全不知道该怎么做。

这是我的bullet类:

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);
}
}

Answer 1

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

看一下:

• How to write a MouseListener
• How to write a MouseMotionListener