Messages

1

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

« on: September 14, 2013, 08:25:16 pm »

Well, in fact I'm trying to get an undergraduate class to understand the basic principles of collision detection in games, so a tile layer with collision info seemed to be the easiest way. It's also very quick to put it together in Tiled, for instance. But of course you're right: it depends on the particular application. A quadtree is usually a sensible idea, but it just seemed overkill in my case 

2

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

« on: September 13, 2013, 02:08:10 pm »

Glad to be of help 

I have another quick question for you: I'm trying to check for collisions between a sprite and a collision layer of tiles, but your MapTile struct doesn't store the GID of a tile. Hence I added a gid field to the struct as follows:

struct MapTile
{
        //returns the base centre point of sprite / tile
        const sf::Vector2f GetBase(void) const
        {
                return sf::Vector2f(sprite.getPosition().x + (sprite.getLocalBounds().width / 2.f),
                sprite.getPosition().y + sprite.getLocalBounds().height);
        }
        sf::Sprite sprite;
        sf::Vector2i gridCoord;
        sf::Uint16 gid; // need gid to check contents
        sf::RenderStates renderStates; //used to perform any rendering with custom shaders or blend mode
};
 

What do you reckon? Is that a sensible approach?

Cheers!

3

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

« on: September 07, 2013, 07:15:44 pm »

Matt, first of all thanks for your code. It works really well!

I've just found a little bug when you compute the number of rows and columns in MapLoader::m_ProcessTiles:

const bool MapLoader::m_ProcessTiles(const pugi::xml_node& tilesetNode)
{
        sf::Uint16 tileWidth, tileHeight, spacing, margin;
        ...
        //slice into tiles
        int columns = sourceImage->getSize().x / tileWidth;
        int rows = sourceImage->getSize().y / tileHeight;
 

This won't take into account the spacing and margin of the tileset, if any. I've discovered by accident, trying to load a map with the blocks1.png tileset (attached below). That tileset requires a margin and spacing of 2 pixels.

The fix is easy:

const bool MapLoader::m_ProcessTiles(const pugi::xml_node& tilesetNode)
{
        sf::Uint16 tileWidth, tileHeight, spacing, margin;
        ...
        //slice into tiles
        int columns = (sourceImage->getSize().x-margin) / (tileWidth+spacing);
        int rows = (sourceImage->getSize().y-margin) / (tileHeight+spacing);
 

Hope it helps 

Cheers!