A fast, easy to use, free, and community supported 2D game engine
Hey,
I'm working on a platforms game, but I have no idea how to recognize platforms from the tilemap and use them in the code, if he is not on a platform he falls down, etc. How to do that? Oh, don't tell me buy LevelSVG, I wanna understand my code and don't wanna spend money.
Thanks!
Duckwit
Member
Are you using a physics engine? If not then you can't do a platform game because you won't have collision detection, the easiest way to do platforming games is to use LevelSVG... As it is designed by the maker of cocos2d specifically to make platforming games.
LevelSVG will help a lot because it will do a lot of the physics programming (like platforms, your character, the ground, etc...) for you.
How much programming do you know, and what kind?
chrisco
Member
Are you using a physics engine? If not then you can't do a platform game because you won't have collision detection,
That's not really true - you could write your own tile-based collision detection. There are some Actionscript-based tutorials at this site that might help: Flash Tile Game Tutorials
Obviously the code would need to be translated to Objective-C, but the concepts should still work.
For a basic 2d collision you can assume your character is enclosed on a rectangle with x,y coordinates, then you can also assume each tile/block/enemy/platform is also enclosed on a rectangle with x,y coordinates, so it's just basic maths to detect collision between two rectangles on a 2D plane.
You either keep a separate info to specify the rectangle sizes and positions, or depending of graphics, you can dynamically assume the rectangle size and position are those from the sprite.
Are you using a physics engine? If not then you can't do a platform game
Like mentioned above, you don't have to use a physics engine. I have developed %90 (so far) of a tile based app with no physics engine. It just depends on what your goal is. My game just calculates CGRect's and their positions for collisions. It really just depends on how "physics" apply to your app.
To help with your question, you could just add some tiles (invisible) in the areas where your hero 'can' stand and check if those exist in an update method.
There are some excellent tilemap tuts out there, just search for them.
Yeah, my isometric game also don't use any physics engine, I did it from scratch, it all depends what you need, to apply gravity and velocities on top of the collision is not really a big deal. That flash tutorial @chrisco posted is really good, saw long time ago and really helped me on the iso coordinates transformations.
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