SFML community forums
Help => General => Topic started by: Christopher Jozwiak on December 13, 2012, 03:48:20 am
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How would i perform a simple box collision detection in sfml?
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The sf::Rect class has the methods Rect.contains and Rect.intersects, so for basic collision detection I would say that's a good place to start.
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Maybe my small example (https://github.com/eXpl0it3r/Examples/blob/master/SFML/SimpleAABB.cpp) could give you some insights. ;)
But keep in mind that it's not finished at all.
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Okay what I'm trying to do is make a classic Snake game. I think i would need to use something like object.GetGlobalBounds().contains(). Then I'm unsure what to put in the contains function. I put in a number and a point? What would the point be?
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You should start using the documentation (http://www.sfml-dev.org/documentation/2.0/), which explains what a class/function does.
The contains() (http://www.sfml-dev.org/documentation/2.0/classsf_1_1Rect.php#aa8a5364c84de6dd5299f833b54e31ef1) function either takes 2 floats or a sf::Vector2f and simply checks if a point (defined by the 2 floats or the sf::Vector2f) is within the sf::Rect that is returned by getGlobalBounds() (http://www.sfml-dev.org/documentation/2.0/classsf_1_1Sprite.php#a203d2d8087bfdca2ebc3c0485cdb7409), which essentially the bounding box of the sprite, describe in the 'world' coordinates.
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Okay so I tried
if (object.getGlobalBounds().intersects( player.getGlobalBounds())){
touching = true;
}
if (touching == true){
player.move(0,0);
}
:-\
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move(0,0) moves the object 0 pixels to the right and 0 pixels down = nothing.
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Never mind. Made a statement print out on the command line if the collision was true. I just think my player.move method needs to be changed. When the event polls i think it overruns the collision and the player keeps moving despite the player.move(0,0).
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Maybe my small example (https://github.com/eXpl0it3r/Examples/blob/master/SFML/SimpleAABB.cpp) could give you some insights. ;)
But keep in mind that it's not finished at all.
Thanks, that is a great example to study!