沿鼠标方向移动对象

Question

I have a bullet class and an algorithm that will move my bullet to where I pressed, but how would I have the bullet continuing on past the mouse_x and mouse_y when it was clicked?

In My Update method:

    float xSpeed = (MoveToX - x) / 9;
    float ySpeed = (MoveToY - y) / 9;

     this.x += xSpeed;
     this.y += ySpeed;

And this is when I first create the bullet:

Bullet(int Mx, int My){
    c = Color.red;
    MoveToX = Mx;
    MoveToY = My;

    MoveToX += Board.cam.camX;
    MoveToY += Board.cam.camY;

Mx is the mouses x when it was clicked. Same with the y.

Edit: This is my final product: everything works as it should

Bullet(int Mx, int My){
    c = Color.red;

    MoveToX = Mx + Board.cam.camX;
    MoveToY = My + Board.cam.camY;

    int speed = 5;
    float distance = (float) Math.sqrt(Math.pow(MoveToX - x, 2) + Math.pow(MoveToY - y, 2));


    amountToMoveX = (((MoveToX - x) / distance) * speed);
    amountToMoveY = (((MoveToY - y) / distance) * speed);

}


public void update(){

    x += amountToMoveX;
    y += amountToMoveY;

}

Answer 1

The instance variables of your bullet shouldn't be moveTo_ , but velocity and direction . Calculate the direction (ie the angle) in the constructor, from the bullet position and the target position. velocity may also be a static constant, depending on your use case.

If it is an option, I would strongly recommend to use a physics- or game-engine . Those kind of problems were already solved a hundred times in those engines. They relieve you from those basic tasks and help you concentrate on your actual problem.