defining sdl_rect and sdl_mousebuttondown

I need to define rectangular areas on the sdl window so that when the mouse button is clicked on a particular area some action has to be performed.

I used GetMouseState(x,y) to get the mouse click event. It works wherever the mouse button is clicked. But rather i need to get the mouse x and y and check it with sdl rect x and y to c if whether the rectangle is clicked.

Solution 1:

Lets say you create a SDL_Rect structure containing the rectangle you want. When you get the coordinates of a mouse-click it's very simple to compare it with the rectangle coordinates:

/* Function to check if a coordinate (x, y) is inside a rectangle */
int check_click_in_rect(int x, int y, struct SDL_Rect *rect)
{
    /* Check X coordinate is within rectangle range */
    if (x >= rect->x && x < (rect->x + rect->w))
    {
        /* Check Y coordinate is within rectangle range */
        if (y >= rect->y && y < (rect->y + rect->h))
        {
            /* X and Y is inside the rectangle */
            return 1;
        }
    }

    /* X or Y is outside the rectangle */
    return 0;
}

Solution 2:

There actually is a built in function for that called SDL_PointInRect. It returns true if clicked and false otherwise

It takes SDL_Point* and SDL_Rect* as arguments

SDL_Point mousePosition;

// Mouse click coords from event handler
mousePosition.x = event.motion.x; 
mousePosition.y = event.motion.y;

if (SDL_PointInRect(&mousePosition, &someSDL_Rect) {
    // Do something
}

If you look into the header file, this function is very similar to @Alink 's answer