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-- bgcircles = {}
function scrollingcircles(y, speed, spacing, radius, color)
for i = 1, 256, spacing do
circfill((i-(gt*speed))%256-radius*2, y, radius, color)
end
end
function scrollingcirclelines(y, speed, spacing, radius, color)
for i = 1, 256, spacing do
circ((i-(gt*speed))%256-radius*2, y, radius, color)
end
end
function scrollingsprite(sprite,x,y,w,h,speed,flip)
flip = flip or false
spr(sprite, (-gt*speed+x+w*8)%(128+w*8)-w*8, y, w, h, flip)
end
--ringed planet
function bgplanetmegasprite(x,y)
--default values
--x = 160-gt
--y = 50
palt(0,false)
palt(13,true)
spr(194,x+10,y+0,7,2)
spr(201,x+10,y+16,7,2)
spr(234,x+2,y+32,6,2)
palt()
end
function drawbg()
cls(0)
camera((sin(shake+t())*shake)/3, (sin(shake+gt/2.1)*shake)/3)
--stars
for i = 1, 64, 1 do
pset((((-gt*0.1)+i*4.3824)*(i/32))%128, sin(i*0.536382)*64+64, 4) --funny random star algorithm!!
end
--galaxies
spr(120, 20, 30, 1, 1)
spr(104, 108, 40, 1, 1)
spr(104, 42, 74, 1, 1, true, true)
--ringed planet
bgplanetmegasprite(150-(gt)%300,50)
--clouds
scrollingcircles(-9, 24, 22, 22, 2)
--small clouds
scrollingsprite(88, 60, 10, 1, 1, 28)
scrollingsprite(88, 120, 10, 1, 1, 28)
scrollingsprite(88, 130, 12, 1, 1, 29)
scrollingsprite(88, 160, 15, 1, 1, 30)
scrollingsprite(72, 145, 15, 1, 1, 30)
scrollingsprite(72, 20, 10, 1, 1, 28)
scrollingsprite(72, 100, 10, 1, 1, 28)
scrollingsprite(72, 170, 15, 1, 1, 30)
--large clouds
scrollingsprite(248, 40, 5, 2, 1, 35)
scrollingsprite(248, 80, 5, 2, 1, 35)
scrollingsprite(248, 180, 9, 2, 1, 38)
scrollingsprite(248, 260, 9, 2, 1, 38)
scrollingsprite(232, 120, 7, 2, 1, 36)
scrollingsprite(232, 160, 7, 2, 1, 36)
scrollingsprite(232, 240, 9, 2, 1, 38)
--fg clouds
scrollingcirclelines(-11, 40, 25, 20, 2)
scrollingcircles(-12, 40, 25, 20, 4)
camera((sin(shake+t())*shake)/2, (sin(shake+gt/2.1)*shake)/2)
--landscape
scrollingcirclelines(125, 72, 25, 20, 8)
scrollingcircles(126, 72, 25, 20, 2)
--landscape lines
rectfill(0,112,128,128,8)
line(0, 113, 128, 113, 2)
line(0, 116, 128, 116, 2)
line(0, 119, 128, 119, 2)
for i = 1, 32, 1 do
line(((-gt+i*2.5)*80)%128, 111, ((-gt+i*2.5)*80)%128*1.2-12.8, 125, 2)
end
--pine trees
local treex = {10,30,20,50,62,70,80,95,100,120}
for i = 1, 10, 1 do
scrollingsprite(231,treex[i],94+sin(i/5.2323),1,2,72,(i%2==0))
end
-- scrollingsprite(231,10,94,1,2,72,true)
-- scrollingsprite(231,30,94,1,2,72)
-- scrollingsprite(231,20,93,1,2,72,true)
-- scrollingsprite(231,50,95,1,2,72,true)
-- scrollingsprite(231,62,93,1,2,72,true)
-- scrollingsprite(231,70,94,1,2,72)
-- scrollingsprite(231,80,95,1,2,72)
-- scrollingsprite(231,95,94,1,2,72)
-- scrollingsprite(231,100,93,1,2,72)
-- scrollingsprite(231,120,95,1,2,72,true)
--small buildings
scrollingsprite(226,15,98,2,2,80)
scrollingsprite(226,65,97,2,2,80)
scrollingsprite(226,95,96,2,2,80)
scrollingsprite(226,115,97,2,2,80)
--totem poles
scrollingsprite(230,25,99,1,2,84)
scrollingsprite(230,65,100,1,2,84,true)
scrollingsprite(230,85,101,1,2,84)
--dead trees
scrollingsprite(228,30,104,2,2,84)
scrollingsprite(228,75,105,2,2,84,true)
scrollingsprite(228,100,104,2,2,84)
scrollingsprite(228,120,105,2,2,84,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+gt/2.1)*shake)
scrollingcirclelines(150, 100, 30, 32, 8)
scrollingcircles(151, 100, 30, 32, 2)
end
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