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Merge pull request #334 from Wilma456/colorcheck

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Add Checks to Colors API
This commit is contained in:
Daniel Ratcliffe 2017-06-28 21:16:54 +01:00 committed by GitHub
commit 836de416bc
1 changed files with 22 additions and 3 deletions
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25
src/main/resources/assets/computercraft/lua/rom/apis/colors.lua
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@ -19,32 +19,51 @@ black = 32768
function combine( ... )
local r = 0
for n,c in ipairs( { ... } ) do
if type( c ) ~= "number" then
error( "bad argument #"..n.." (expected number, got " .. type( c ) .. ")", 2 )
end
r = bit32.bor(r,c)
end
return r
end
function subtract( colors, ... )
if type( colors ) ~= "number" then
error( "bad argument #1 (expected number, got " .. type( colors ) .. ")", 2 )
end
local r = colors
for n,c in ipairs( { ... } ) do
if type( c ) ~= "number" then
error( "bad argument #"..tostring( n+1 ).." (expected number, got " .. type( c ) .. ")", 2 )
end
r = bit32.band(r, bit32.bnot(c))
end
return r
end
function test( colors, color )
if type( colors ) ~= "number" then
error( "bad argument #1 (expected number, got " .. type( colors ) .. ")", 2 )
end
if type( color ) ~= "number" then
error( "bad argument #2 (expected number, got " .. type( color ) .. ")", 2 )
end
return ((bit32.band(colors, color)) == color)
end
function rgb8( r, g, b )
if type(r) == "number" and g == nil and b == nil then
if type( r ) ~= "number" then
error( "bad argument #1 (expected number, got " .. type( r ) .. ")", 2 )
elseif type(r) == "number" and g == nil and b == nil then
return bit32.band( bit32.rshift( r, 16 ), 0xFF ) / 255, bit32.band( bit32.rshift( r, 8 ), 0xFF ) / 255, bit32.band( r, 0xFF ) / 255
elseif type(r) == "number" and type(g) == "number" and type(b) == "number" then
return
bit32.lshift( bit32.band(r * 255, 0xFF), 16 ) +
bit32.lshift( bit32.band(g * 255, 0xFF), 8 ) +
bit32.band(b * 255, 0xFF)
else
error( "Expected 1 or 3 numbers", 2 )
elseif type( g ) ~= "number" then
error( "bad argument #2 (expected number, got " .. type( g ) .. ")", 2 )
elseif type( b ) ~= "number" then
error( "bad argument #3 (expected number, got " .. type( b ) .. ")", 2 )
end
end