lua utils

[ivan]

Hey Arampl, looks cool.

About slowliness: vector graphics can be prepared beforehand using canvases, and drawn as plain images in love.draw() later. Something like precaching svgs' in Qt.

That's what I did in the demo above. I'm afraid the slowdown comes from constructing polygons from SVG paths, not necessarily from drawing the result. I guess it could be improved but then again, you might as well convert the SVG files to a simpler format that Love2D could just render without doing any math.

[arampl]

looks cool.

Thanks!

you might as well convert the SVG files to a simpler format that Love2D could just render without doing any math

Of course. All that you want to generate procedurally can be done in love.load() or before loading next level of your game. Even create pngs (even texture atlases), store them somewhere, then use in rendering function.

[ivan]

I've decided to port over a couple of my tools to Love2D,
in particular a log terminal and a profiler.
Seems to work OK except that the memory consumption keeps growing even after an explicit call to

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collectgarbage('collect')

Now, I understand that the profiler in particular is highly inefficent and creates a
Lua object after each hook is called,
but with AGen (another Lua engine) the memory consumption is back to normal after a full collection cycle.
Anybody has tips on keeping the Lua memory low?

[ivan]

Have been investigating Box2D's 'contacts' and 'manifolds'
so I wrote a couple of articles detailing what I've learned.

contact lists and callbacks: http://2dengine.com/doc/gs_physics5.html
collisions and math in Box2D: http://2dengine.com/doc/gs_physics6.html

I hope somebody might find these useful.

[ivan]

Updated SVG demo to the latest version of Love2D. Again, it's just a demo and missing a lot of core svg features.
Extract and drop your svg files in the "test" folder to see if it works.

[ivan]

Experiment: wave library, an inferior version of tweener with a simplified API.
Results are normalized in range -1 to 1, period is auto-wrapped in range -1 to -1.
the idea is:

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wave = require('wave')

-- y = wave.wavetype(x)
-- examples:

y = wave.sin(0) -- sine wave
y = wave.square(1) -- square wave
y = wave.triangle(2) -- triangle wave
y = wave.circ(3) -- circular wave

[alundaio]

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a = { b = { c = 'foo' } }
-- old style
if a.b then
  foo = a.b.c
end
-- new style:
foo = table.get(a, 'b.c')

This seems silly to me when you can do:

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foo = a.b and a.b.c

But other stuff is great thanks.

[ivan]

Admittedly that is an old utility and I don't use it anymore.
Perhaps the only useful part is iteration of nested tables:

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for i,v in table.fields(a) do -- handles cycles too
  print(i .. '=>' .. tostring(v))
end

Outputs:

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b=>table
b.c=>foo

For debugging it's ok, but no real application otherwise.

For tables, I use a much simpler util nowadays.
https://github.com/2dengine/table.lua

Thanks for taking a look though.

[ivan]

New polygon tutorial with interactive demos:
https://2dengine.com/?p=polygons

[ivan]

I don't claim to know a lot about multiplayer games, but I decided to write up a simple tutorial:
https://2dengine.com/?p=networking