> As René pointed out in most of the Pymunk examples Y is converted so that positive Y points up to keep examples consistent and close to "real" physics.
Y points up in real physics? This is making my head hurt; I need to go lie -Y. đŸ˜œ On Wed, 28 Feb 2018, 22:52 Victor Blomqvist, <v...@viblo.se> wrote: > Hi, > > RenĂ© sent an email asking if I had any input (as the author of pymunk), so > here I am. In general I think it seems like a very well versed vector > library in the making :) > > A couple of comments: > 1. A function that normalizes and returns the length before normalizing in > one call can be useful and be a little bit faster than doing two calls. In > the pymunk.vec2d class its called normalize_return_length. > > 2. A user asked me why a vector cant be scaled up again after it has been > scaled down to 0 (which is not supported in the pymunk.vec2d class or > pygame.math). It would be a very useful feature and also beginner friendly. > However, I dont see a way to do it in a good way so I havent implemented > anything. > > 3. As RenĂ© pointed out in most of the Pymunk examples Y is converted so > that positive Y points up to keep examples consistent and close to "real" > physics. Would be nice if pygame could handle it easily, maybe something > you could set in the beginning of you code? But Im not sure if it fits here > :) > > 4. In many cases Pygame methods expect an integer, such as position in > pygame.draw.circle(). Since Vector2 seems to be a float either some > automatic rounding or a method Vector2.int_tuple or similar would be > convenient? > > 5. You already do some benchmarking, did you try Pypy? > > /Victor > > > > On Tue, Feb 27, 2018 at 10:55 PM, Ian Mallett <i...@geometrian.com> wrote: > >> ​(Skims discussion) >> >> For e.g. `abs(Vector2(2,-1).elementwise())`, my (C++) library instead >> handles this as `abs(Vec2(2,-1))`, returning another `Vec2`. In C++, if you >> weren't expecting that, you get a compile error on whatever happens next, >> whereas in Python you'll get a `TypeError`, so it's well-defined. >> >> If you want the vector's length, I use a function, but perhaps it's more >> pythonic to use a method: `Vec2(2,-1).getLength()`, or >> `Vec2(2,-1).getLengthSq()`. >> >> If your vector represents a complex number and you're wondering why >> `abs(...)` shouldn't return a complex modulus, then I ask why you aren't >> using the built-in `complex`, which is designed for this. >> >> Ian >> > >
