love.graphics.polygon Help

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Someguynamedpie
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love.graphics.polygon Help

Post by Someguynamedpie » Thu Jul 01, 2010 2:52 am

Whats the syntax for it? I thought it was {{X=0,Y=2},etc}

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TechnoCat
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Re: love.graphics.polygon Help

Post by TechnoCat » Thu Jul 01, 2010 3:26 am

love.graphics.polygon()
love.graphics.polygon("line",0,0,10,0,0,10) would make a triangle from 0,0 10,0 to 0,10 I believe.

Snow
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Re: love.graphics.polygon Help

Post by Snow » Thu Jul 01, 2010 2:25 pm

If you already have a table of vertices you can use Lua's unpack(table) like love.graphics.polygon('line', unpack({x1, y1, x2, y2, x3, y3, ...})). I think it should work anyway.

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Robin
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Re: love.graphics.polygon Help

Post by Robin » Thu Jul 01, 2010 4:19 pm

Snow wrote:If you already have a table of vertices you can use Lua's unpack(table) like love.graphics.polygon('line', unpack({x1, y1, x2, y2, x3, y3, ...})). I think it should work anyway.
Not if they use the format {{x, y}, {x, y}, ...}, though.
Help us help you: attach a .love.

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Re: love.graphics.polygon Help

Post by Snow » Thu Jul 01, 2010 4:50 pm

Robin wrote:Not if they use the format {{x, y}, {x, y}, ...}, though.
Just tested it, TechnoCat had it right and unpacking works.
Edit: Right, on the wiki it accepts a table also so instead of using unpack you can just wrap the list in braces, like {x1, y1, x2, y2, ...}.

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Someguynamedpie
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Re: love.graphics.polygon Help

Post by Someguynamedpie » Fri Jul 02, 2010 1:43 am

Im having trouble: I have points formatted like this:
{{x=10,y=10},{x=30,y=30}}, how would i format it into 1 table like {10,10,30,30}?

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Re: love.graphics.polygon Help

Post by Snow » Fri Jul 02, 2010 2:52 am

Someguynamedpie wrote:Im having trouble: I have points formatted like this:
{{x=10,y=10},{x=30,y=30}}, how would i format it into 1 table like {10,10,30,30}?

Code: Select all

points = {{x=10,y=10},{x=30,y=30}}
pointStack = {}

for k, v in pairs(points) do
table.insert(pointStack, v.x)
table.insert(pointStack, v.y)
end
This should do it.

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rhezalouis
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[Response]Eh?

Post by rhezalouis » Mon Jul 05, 2010 12:06 pm

IIRC, the love.graphics.polygon handles both the

Code: Select all

love.graphics.polygon("line", 10, 10, 20, 20, 10, 20);--and
love.graphics.polygon("line", {10, 10, 20, 20, 10, 20});
you don't need to unpack the list of coordinates. :glee:
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thelinx
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Re: [Response]Eh?

Post by thelinx » Mon Jul 05, 2010 1:00 pm

rhezalouis wrote:IIRC, the love.graphics.polygon handles both the

Code: Select all

love.graphics.polygon("line", 10, 10, 20, 20, 10, 20);--and
love.graphics.polygon("line", {10, 10, 20, 20, 10, 20});
you don't need to unpack the list of coordinates. :glee:
According to the wiki, this is the case.

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Re: love.graphics.polygon Help

Post by pekka » Mon Jul 05, 2010 5:29 pm

The second form was added to the docs quite recently, so it might not be widely known. I know this because I am the one responsible for adding it. I discovered the other usage from reading the C++ source and dutifully added it to the docs. I also had an example code snippet there, but then a site crash occurred ( :o ) and reverted the Wiki a couple of days backwards. I redid the explanation, but omitted the code example the second time, out of laziness probably.

It would probably be good to have a code snippet using both ways to draw a simple polygon there. I can add one soon, once I am on a LOVELY computer again. But anyone else can do it too :)

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