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Coding Dojo: Lua with LÖVE
http://www.meetup.com/Latvian-Developers-Network/events/104717652/
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local CHAR_START = 48 | |
local CHAR_END = 94 | |
local letters = {} | |
local font = nil | |
function love.load() | |
love.graphics.setColor(0, 255, 0) | |
font = love.graphics.newImageFont( | |
'katakana.png', | |
'0123456789:;<=>?' .. | |
'@ABCDEFGHIJKLMNO' .. | |
'PQRSTUVWXYZ[\\]^' | |
) | |
love.graphics.setFont(font) | |
particle = love.graphics.newImage('particle.png') | |
fillLetters() | |
end | |
function ps() | |
local ps = love.graphics.newParticleSystem(particle, 60) | |
ps:setDirection(-math.pi/2) | |
ps:setEmissionRate(10) | |
ps:setParticleLifetime(math.random(), 5*math.random()+1) | |
ps:setSpeed(math.random(70)+10) | |
ps:setSpread(0.1) | |
ps:setColors(0,255,0,128,0,255,0,255) | |
ps:setSizes(0.4,0) | |
ps:start() | |
ps:update(10) | |
return ps | |
end | |
function createLetter() | |
letter = { | |
x = math.random(love.graphics.getWidth()), | |
y = math.random(love.graphics.getHeight()), | |
l = string.char(math.random(CHAR_START, CHAR_END)), | |
alpha = 32, | |
speed = 0.5 + 2*math.random() | |
} | |
letter.ps = {}; | |
for i=1,5 do | |
table.insert(letter.ps,ps()); | |
end | |
return letter | |
end | |
function fillLetters() | |
for i=1,100 do | |
--letters.insert(i,createLetter()) | |
table.insert(letters, createLetter()) | |
end | |
end | |
function love.update(dt) --delta! | |
x, y = love.mouse.getPosition() | |
for i,letter in ipairs(letters) do | |
distance = math.sqrt( | |
math.pow((x - letter.x), 2) + | |
math.pow((y - letter.y), 2)) | |
letter.alpha = math.max(0,math.min(255,255-distance/500*255)) | |
letter.y = letter.y + letter.speed | |
for i,ps in ipairs(letter.ps) do | |
ps:setColors(0,255,0,letter.alpha/8,0,255,0,0) | |
ps:update(dt) | |
end | |
if letter.y > love.graphics.getHeight()+100 then | |
letter.y = -font:getHeight() | |
letter.x = math.random(love.graphics.getWidth()) | |
end | |
end | |
end | |
function love.draw() | |
for i,letter in ipairs(letters) do | |
love.graphics.setColor(0, 255, 0, letter.alpha) | |
love.graphics.print(letter.l, letter.x-font:getHeight()/2, letter.y) | |
for i,ps in ipairs(letter.ps) do | |
love.graphics.draw(ps, letter.x-i*2+5, letter.y) | |
end | |
end | |
end |
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