Messages

1

SFML projects / Re: 'Tiled' Tile-map Loader

« on: January 12, 2014, 01:46:32 am »

Hi,

This project looks awesome. I'm trying to compile it on Linux and having some trouble. Specifically, I get the following error;

Code: [Select]

src/MapObject.cpp:220:37: error: non-const lvalue reference to type
      'Vector2<[...]>' cannot bind to a temporary of type 'Vector2<[...]>'
        return Helpers::Vectors::Normalize(end - start);
                                           ^~~~~~~~~~~
/home/cole/Desktop/sfml-tmxloader/include/Helpers.h:70:47: note: passing
      argument to parameter 'source' here
                static sf::Vector2f Normalize(sf::Vector2f& source)
                                                            ^
1 error generated.

Which is associated with this function:

Code: [Select]

sf::Vector2f MapObject::CollisionNormal(const sf::Vector2f& start, const sf::Vector2f& end) const
{
Segment trajectory(start, end);
for(auto& s : m_polySegs)
{
if(trajectory.Intersects(s))
{
sf::Vector2f v = s.End - s.Start;
sf::Vector2f n(v.y, -v.x);
//invert normal if pointing in wrong direction
float tAngle = Helpers::Vectors::GetAngle(end - start);
float nAngle = Helpers::Vectors::GetAngle(n);
if(nAngle - tAngle > 90.f) n =- n;

return Helpers::Vectors::Normalize(n);
}
}
return Helpers::Vectors::Normalize(end - start);
}

I have limited experience with C++, and I don't know what this code is supposed to do, but I was able to make the code compile by changing the second return line to:

Code: [Select]

return sf::Vector2f(0,0);

The examples seem to work with this code (although it's probably doing something horrendous somewhere; I don't know).

Is this problem just on my end? Am I doing something incorrectly? Thanks.