Asteroides - Codea game - 4/10 - Explosion.lua

Explosion = class()

function Explosion:init(pos,ecolor,points)
    self.position = pos
    self.opacity = 255
    self.time = 0
    self.lines = {}
    self.ecolor= ecolor
    sound("explode",967)
    self.text = points
    for i = 1,10 do
        dir = vec2(0,1)
        dir = dir:rotate( math.rad(math.random(360)) )
        table.insert( self.lines, dir*math.random(2,7) )
    end
end

function Explosion:isDone()
    return self.opacity <= 0
end

function Explosion:draw()
    self.time = self.time + 0.5

    pushStyle()

    lineCapMode(ROUND)
    strokeWidth(20)
    smooth()
    local e = self.ecolor
    stroke(e.r,e.g,e.b,math.max(self.opacity,0))

    local p = self.position
    for i,v in ipairs(self.lines) do
        vt = p + v * self.time
        line(p.x, p.y, vt.x, vt.y)
    end

    self.opacity = 255 * (1 - (self.time/30))

    popStyle()
    drawText(""..self.text,2,1,p.x,p.y)
end