Plasma effect: Difference between revisions

=={{header|Lua}}==

Needs LÖVE 2D Engine

{{trans|C++}}

<lang lua>

_ = love.graphics

p1, p2, points = {}, {}, {}

function hypotenuse( a, b )

return a * a + b * b

end

function love.load()

size = _.getWidth()

currentTime, doub, half = 0, size * 2, size / 2

local b1, b2

for j = 0, size * 2 do

for i = 0, size * 2 do

b1 = math.floor( 128 + 127 * ( math.cos( math.sqrt( hypotenuse( size - j , size - i ) ) / 64 ) ) )

b2 = math.floor( ( math.sin( ( math.sqrt( 128.0 + hypotenuse( size - i, size - j ) ) - 4.0 ) / 32.0 ) + 1 ) * 90 )

table.insert( p1, b1 ); table.insert( p2, b2 )

end

end

end

function love.draw()

local a, c1, c2, c3, s1, s2, s3

currentTime = currentTime + math.random( 2 ) * 3

local x1 = math.floor( half + ( half - 2 ) * math.sin( currentTime / 47 ) )

local x2 = math.floor( half + ( half / 7 ) * math.sin( -currentTime / 149 ) )

local x3 = math.floor( half + ( half - 3 ) * math.sin( -currentTime / 157 ) )

local y1 = math.floor( half + ( half / 11 ) * math.cos( currentTime / 71 ) )

local y2 = math.floor( half + ( half - 5 ) * math.cos( -currentTime / 181 ) )

local y3 = math.floor( half + ( half / 23 ) * math.cos( -currentTime / 137 ) )

s1 = y1 * doub + x1; s2 = y2 * doub + x2; s3 = y3 * doub + x3

for j = 0, size do

for i = 0, size do

a = p2[s1] + p1[s2] + p2[s3]

c1 = a * 2; c2 = a * 4; c3 = a * 8

table.insert( points, { i, j, c1, c2, c3, 255 } )

s1 = s1 + 1; s2 = s2 + 1; s3 = s3 + 1;

end

s1 = s1 + size; s2 = s2 + size; s3 = s3 + size

end

_.points( points )

end

</lang>