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bgcircles = {}
function scrollingcircles(y, speed, spacing, radius, color)
for i = 1, 256, spacing do
circfill((i-(t()*speed))%256-radius*2, y, radius, color)
end
end
function scrollingcirclelines(y, speed, spacing, radius, color)
for i = 1, 256, spacing do
circ((i-(t()*speed))%256-radius*2, y, radius, color)
end
end
function scrollingsprite(sprite,x,y,w,h,speed,flip)
flip = flip or false
spr(sprite, (-t()*speed+x+w*8)%(128+w*8)-w*8, y, w, h, flip)
end
function addbgcircle(x, y, velx, r, color, pos)
local circle = {}
circle.x = x
circle.y = y
circle.velx = velx
circle.r = r
circle.color = color
function circle.draw(circle)
circle.x += circle.velx
if circle.x < 0 - circle.r * 2 then
del(bgcircles, circle)
end
circfill(circle.x,circle.y,circle.r,circle.color)
end
add(bgcircles,circle, pos)
end
function drawbg()
cls(0)
camera((sin(shake+t())*shake)/3, (sin(shake+t()/2.1)*shake)/3)
--stars
for i = 1, 64, 1 do
pset(((-t()+i*4.3824)*(i/32))%128, sin(i*0.536382)*64+64, 4)
end
--ringed planet
palt(0,false)
spr(194,160-t(),50,4,2)
spr(199,200-t(),50,2,2)
spr(214,192-t(),58,1,1)
spr(201,160-t(),66,6,2)
spr(207,208-t(),66,1,1)
spr(235,152-t(),82,1,1)
spr(237,168-t(),82,3,1)
spr(251,152-t(),90,4,1)
spr(255,192-t(),82,1,1)
palt(0,true)
--clouds
-- scrollingcircles(-7, 24, 22, 22, 4)
scrollingcircles(-9, 24, 22, 22, 2)
--small clouds
scrollingsprite(198, 20, 10, 1, 1, 28)
scrollingsprite(236, 60, 10, 1, 1, 28)
scrollingsprite(198, 100, 10, 1, 1, 28)
scrollingsprite(236, 120, 10, 1, 1, 28)
scrollingsprite(236, 130, 12, 1, 1, 29)
scrollingsprite(198, 145, 15, 1, 1, 30)
scrollingsprite(236, 160, 15, 1, 1, 30)
scrollingsprite(198, 170, 15, 1, 1, 30)
--large clouds
scrollingsprite(249, 40, 5, 2, 1, 35)
scrollingsprite(249, 80, 5, 2, 1, 35)
scrollingsprite(233, 120, 7, 2, 1, 36)
scrollingsprite(233, 160, 7, 2, 1, 36)
scrollingsprite(249, 180, 9, 2, 1, 38)
scrollingsprite(233, 240, 9, 2, 1, 38)
scrollingsprite(249, 260, 9, 2, 1, 38)
--fg clouds
scrollingcircles(-11, 40, 25, 20, 2)
scrollingcircles(-12, 40, 25, 20, 4)
camera((sin(shake+t())*shake)/2, (sin(shake+t()/2.1)*shake)/2)
--landscape
scrollingcirclelines(125, 72, 25, 20, 8)
scrollingcircles(126, 72, 25, 20, 2)
--landscape lines
line(0, 112, 128, 112, 8)
line(0, 114, 128, 114, 8)
line(0, 116, 128, 116, 8)
line(0, 117, 128, 117, 8)
rectfill(0,119,128,128,8)
for i = 1, 32, 1 do
line(((-t()+i*2.5)*80)%128, 111, ((-t()+i*2.5)*80)%128*1.2-12.8, 125, 2)
end
--pine trees
scrollingsprite(231,20,77+16,2,2,72,true)
scrollingsprite(231,70,78+16,2,2,72)
scrollingsprite(231,80,80+16,2,2,72)
scrollingsprite(231,95,78+16,2,2,72)
scrollingsprite(231,100,79+16,2,2,72)
scrollingsprite(231,120,80+16,2,2,72,true)
--small buildings
scrollingsprite(226,15,80+16,2,2,78)
scrollingsprite(226,65,80+16,2,2,78)
scrollingsprite(226,95,80+16,2,2,78)
scrollingsprite(226,115,80+16,2,2,78)
--totem poles
scrollingsprite(230,25,83+16,1,2,82)
scrollingsprite(230,65,84+16,1,2,82)
scrollingsprite(230,85,85+16,1,2,82)
--dead trees
scrollingsprite(228,30,85+16,2,2,84)
scrollingsprite(228,75,86+16,2,2,84,true)
scrollingsprite(228,100,87+16,2,2,84)
scrollingsprite(228,120,88+16,2,2,84,true)
--large buildings (front)
scrollingsprite(192,52,94,2,4,90)
scrollingsprite(192,22,91,2,4,90)
scrollingsprite(192,102,90,2,4,90)
scrollingsprite(192,137,92,2,4,90)
camera(sin(shake+t())*shake, sin(shake+t()/2.1)*shake)
scrollingcirclelines(150, 100, 30, 32, 8)
scrollingcircles(151, 100, 30, 32, 2)
end
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