Elysian Shadows

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bool checkCollision( SDL_Rect A, SDL_Rect B )
{
    //The sides of the rectangles
    int leftA, leftB;
    int rightA, rightB;
    int topA, topB;
    int bottomA, bottomB;

    //Calculate the sides of rect A
    leftA = A.x;
    rightA = A.x + A.w;
    topA = A.y;
    bottomA = A.y + A.h;

    //Calculate the sides of rect B
    leftB = B.x;
    rightB = B.x + B.w;
    topB = B.y;
    bottomB = B.y + B.h;

    //If any of the sides from A are outside of B
    if( bottomA <= topB )
    {
        return false;
    }

    if( topA >= bottomB )
    {
        return false;
    }

    if( rightA <= leftB )
    {
        return false;
    }

    if( leftA >= rightB )
    {
        return false;
    }

    //If none of the sides from A are outside B
    return true;
}

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void Player::Move( SDL_Rect solidCollisionBox )
{
	//Move the Player left or right
	collisionBox.x += xVel;
	//If the Player went too far to the left or right
	if( ( collisionBox.x < 0 ) || ( collisionBox.x + PLR_Width > SCR_Width ) || (checkCollision( collisionBox, solidCollisionBox ) ) )
	{
		//move back
		collisionBox.x -= xVel;
	}
	//Move the Player up or down
	collisionBox.y += yVel;
	//If the Player went too far up or down
	if( ( collisionBox.y < 0 ) || ( collisionBox.y + PLR_Height > SCR_Height ) || (checkCollision( collisionBox, solidCollisionBox ) ) )
	{
		//move back
		collisionBox.y -= yVel;
	}
}

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//move back
collisionBox.x -= xVel;
collisionBox.y -= yVel;

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//move back
collisionBox.x -= 2 * xVel;
collisionBox.y -= 2 * yVel;