Snippet: Drawing spirals

ndoss

Adapted from: http://www.pixelwit.com/blog/2008/04/how-to-draw-a-spiral/

Spiral = gideros.class(Shape) function Spiral:init(t) local x = t.x or t.y or 0 local y = t.y or t.x or 0 local fillStyle = t.fillStyle or { Shape.SOLID, 0xff0000, 0.5 } local lineStyle = t.lineStyle or { 2, 0xffffff, 0.5 } local radius = t.radius or 100 local sides = t.sides or radius local startAngle = t.startAngle or 0 local arcAngle = t.arcAngle or 1 local coils = t.coils or 4 local rotation = t.rotation or 0   self:setLineStyle(unpack(lineStyle))   local awayStep = radius/sides; local aroundStep = coils/sides; local aroundRadians = aroundStep * 2 * math.pi; local rotation = rotation * 2 * math.pi;   self:beginPath() self:setPosition(x,y) self:moveTo(0,0)   for i = 1,sides do local away = i * awayStep; local around = i * aroundRadians + rotation; self:lineTo(math.cos(around) * away, math.sin(around) * away); end   self:endPath()   if t.alpha then self:setAlpha(t.alpha) end if t.parent then t.parent:addChild(self) end   end   -- Big Center spirals Spiral.new{x=250, y=210, radius=200, coils=4, rotation=0, lineStyle={27, 0x0000ff}, parent=stage, }   Spiral.new{x=250, y=210, radius=127, coils=2.5, rotation=.5, lineStyle = {27, 0xFF0000}, parent=stage}   -- Small corner spirals Spiral.new{x=50, y=50, radius=50, coils=4, rotation=0, lineStyle={4, 0xFF00FF}, parent=stage} Spiral.new{x=125, y=50, radius=25, coils=3, rotation=0.5, lineStyle={4, 0xFF00FF}, parent=stage}   Spiral.new{x=450, y=50, radius=50, coils=-4, rotation=0.5, lineStyle={4, 0x00FFFF}, parent=stage} Spiral.new{x=375, y=50, radius=25, coils=-3, rotation=0, lineStyle={4, 0x00FFFF}, parent=stage}   Spiral.new{x=50, y=350, radius=50, coils=-4, rotation=0, lineStyle={4, 0xFFFF00}, parent=stage} Spiral.new{x=125, y=350, radius=25, coils=-3, rotation=0.5, lineStyle={4, 0xFFFF00}, parent=stage}   Spiral.new{x=450, y=350, radius=50, coils=4, rotation=0.5, lineStyle={4, 0x00FF00}, parent=stage} Spiral.new{x=375, y=350, radius=25, coils=3, rotation=0, lineStyle={4, 0x00FF00}, parent=stage}