XOR and IsClockWise

[whitebear]

I needed a IsClockWise Function so I converted this code to Lua.
Only problem I had was that LÖVE does not have XOR so I made one.

Usage:
GetIsClockWise(x1,y1,x2,y2,x3,y3)
If points are given in clockwise order it returns true, else it returns false.


XOR(a,b)
if a is true and b is true returns false
if a is false and b is false returns false
if a is false and b is true returns true
if a is true and b is false returns true

example syntrax:

Code: Select all

if XOR(a > b, b < c) then
--my bla code if b neither biggest or smallest
else
--my bla code if b is biggest or smallest
end

I know the example sucked.

[ljdp]

I did the exact same thing yesterday

http://locofilm.co.uk/lovesnips/Is_clockwise
http://locofilm.co.uk/lovesnips/Xor_boolean

[Robin]

I think the XOR thing could be done with a one-liner. Something like "bool(a) ~= bool(b)".

[bartbes]

I think the XOR thing could be done with a one-liner. Something like "bool(a) ~= bool(b)".

POWNED?

Well, at least a ~= b is a lot shorter..

[Robin]

Well, at least a ~= b is a lot shorter..

Your version wins. It seems we have no bool() in Lua .

[bartbes]

I've thought of a fix for that:

Code: Select all

function xor(a, b)
    return not a ~= not b
end

Not will convert it into boolean for you.

[whitebear]

Its not same but what ever.. I just posted it if it would help.