CODEWITHSUNDEEP
c2dsdlspritegraphic
user3668063
user3668063

Reputation: 3

Collision 2D - Detecting the side

I'm working on my brick breaker and to make a proper colliding system so as to make the ball switch direction logically, I have to detect with which side of the brick the ball collided. Here is my current script :

int sprite_collide(const Sprite item1, const Sprite item2)
{
    if(item1.sShow == 0 || item2.sShow == 0) // return if any item is invisible
        return 0;

    if(item1.sCollide == 0 || item2.sCollide == 0) 
        return 0;

    if((item2.sPos.x >= item1.sPos.x + item1.sImg->w)      // too right
    || (item2.sPos.x + item2.sImg->w <= item1.sPos.x) // too left
    || (item2.sPos.y >= item1.sPos.y + item1.sImg->h) // too up
    || (item2.sPos.y + item2.sImg->h <= item1.sPos.y))  // too down
    return 0;

return 1;
}

The Sprite Struct :

typedef struct Sprite
{
    SDL_Surface *sImg;
    SDL_Rect sPos;

    int sShow; // If sShow = 1, we show it.
    int sCollide; // If sCollide = 1, then it's physic.
    int sMoving; // If sMoving = 1, it'll be able to move
    float sSpeed;

    int sLife;
    int sInit;

} Sprite;

Upvotes: 0

Views: 121

Answers (1)

ihsan
ihsan

Reputation: 586

You are just looking for any collision and then you return an int value. I would suggest to make another method to identify which side of the brick the ball touched. Something like this:

int sprite_collide(const Sprite item1, const Sprite item2)
{
    if(item2.sPos.x >= item1.sPos.x + item1.sImg->w) // trop à droite
        doAction(1);
    if(item2.sPos.x + item2.sImg->w <= item1.sPos.x) // trop à gauche
        doAction(2);
    ...
}

And then the doAction() method will do something when the brick touches the side like you mentioned in the comments.

Good luck.

Upvotes: 1

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