bullet keep following mouse direction

[newbie123]

Hello
I have a problem where the bullet keeps following the mouse instead of taking mouse angle and direction and keep going.

I have this code and someone fixed it for me but i there is a small problem. The guy who fixed it used Sprite.SetVector and the problem is there is no Vector function in sprite class.

can you guys please help.

My code

Code: [Select]

float Speed = 10;

float BulletX = Sprite[i].GetPosition().x;
float BulletY = Sprite[i].GetPosition().y;
                       

float AngleX = MouseX - BulletX;
float AngleY = MouseY - BulletY;

float vectorLength = sqrt(AngleX*AngleX + AngleY*AngleY);

float DirectionX = AngleX / vectorLength;
float DirectionY = AngleY / vectorLength;

float VelocityX = DirectionX * Speed;
float VelocityY = DirectionY * Speed;

Sprite[i].Move (VelocityX, VelocityY);

Fixed code

Code: [Select]


// This code is called only when the bullet is fired
float bullet_x=Sprite[i].GetPosition().x;
float bullet_y=Sprite[i].GetPosition().y;
float angle_x=MouseX-bullet_x;
float angle_y=MouseY-bullet_y;
float vector_length=sqrt(angle_x*angle_x + angle_y*angle_y);

Sprite[i].SetVector(angle_x/vector_length, angle_y/vector_length);  // Each bullet stores a direction vector


// This code is called every update
float velocity_x = Sprite[i].GetVector().x * Speed;
float velocity_y = Sprite[i].GetVector().y * Speed;
Sprite[i].Move(velocity_x, velocity_y);


Hoe can I do this ?
Sprite.SetVector(angle_x/vector_length, angle_y/vector_length);  //
Sprite.GetVector().x

[Tex Killer]

You must store it on your own, out of the Sprite class, and use it from wherever you've stored. You can make a container class, that have a Sprite inside, and this vector as well.

[newbie123]

You must store it on your own, out of the Sprite class, and use it from wherever you've stored. You can make a container class, that have a Sprite inside, and this vector as well.

can please give me an example. I have never use Vectors in sfml.

[Tex Killer]

Code: [Select]

class MySprite {
    public:
        sf::Sprite sprite;
        float speedX;
        float speedY;
}

And then:

Code: [Select]

MySprite Sprite;
Sprite.speedX = [your calculations here];
Sprite.speedY = [your calculations here];
// ...
Sprite.sprite.Move(Sprite.speedX * Speed, Sprite.speedY * Speed);

You would probably have better ways of doing it, depending on your code design. Test it and make it yourself.