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setVirtualResolution(640,480)


dim circles[100]

t = getMilliseconds()
for i = 1 to 100
    circles[i] = createSprite(getImageCircle(random(8,128), 255,255,255))
    r = random(0, 255)
    g = random(0, 255)
    b = random(0, 255)
    setSpriteColor(circles[i], r, g, b, 255)
    setSpritePosition(circles[i], random(0,640), random(0,480))
next i
t = getMilliseconds() - t



do


    if getrawkeypressed(32) = 1
        for i = 1 to 100
            r = random(0, 255)
            g = random(0, 255)
            b = random(0, 255)
            setSpriteColor(circles[i], r, g, b, 255)
            setSpritePosition(circles[i], random(0,704)-64, random(0,544)-64)
        next i
    endif


    print(t)
    sync()
loop





function getImageCircle(radius, red, green, blue)
    mem = 1
    diameter = radius+radius
    memSize = diameter*diameter*4 + 12
    createMemblock(mem, memSize)

    // 12-byte Header
    setMemblockInt(mem, 0, diameter)
    setMemblockInt(mem, 4, diameter)
    setMemblockInt(mem, 8, 32)

    //Color value
    base  = (blue*65536) + (green*256) + red
    color = (255*16777216) + base

    // Unfortunately, we have to fill the entire image
    // to prevent random artifacts from showing up.
    for y = 0 to diameter-1
        for x = 0 to diameter-1
            pos = (y*diameter + x)*4 + 12
            setMemblockInt(mem, pos, 0)
        next x
    next y


    cx = radius-1
    cy = radius-1
    x  = radius-1
    y  = -1
    t# = 0

    while x > y
        inc y
        cur_dist# = E2DC_Distance#(radius, y)
        if cur_dist# <= t# then dec x

        a = 127*cur_dist# : alpha1 = (a*16777216) + base
        a = 127 - a       : alpha2 = (a*16777216) + base

        // octant 1
        E2DC_MemDot(mem, cx-y, cy-x,   color)
        E2DC_MemDot(mem, cx-y, cy-x-1, alpha2)
        E2DC_MemDot(mem, cx-y, cy-x+1, alpha1)
        // octant 2
        E2DC_MemDot(mem, cx-x,   cy-y, color)
        E2DC_MemDot(mem, cx-x-1, cy-y, alpha2)
        E2DC_MemDot(mem, cx-x+1, cy-y, alpha1)
        // octant 3
        E2DC_MemDot(mem, cx-x,   cy+y, color)
        E2DC_MemDot(mem, cx-x-1, cy+y, alpha2)
        E2DC_MemDot(mem, cx-x+1, cy+y, alpha1)
        // octant 4
        E2DC_MemDot(mem, cx-y, cy+x,   color)
        E2DC_MemDot(mem, cx-y, cy+x+1, alpha2)
        E2DC_MemDot(mem, cx-y, cy+x-1, alpha1)
        // octant 5
        E2DC_MemDot(mem, cx+y, cy+x,   color)
        E2DC_MemDot(mem, cx+y, cy+x+1, alpha2)
        E2DC_MemDot(mem, cx+y, cy+x-1, alpha1)
        // octant 6
        E2DC_MemDot(mem, cx+x,   cy+y, color)
        E2DC_MemDot(mem, cx+x+1, cy+y, alpha2)
        E2DC_MemDot(mem, cx+x-1, cy+y, alpha1)
        // octant 7
        E2DC_MemDot(mem, cx+x, cy-y,   color)
        E2DC_MemDot(mem, cx+x+1, cy-y, alpha2)
        E2DC_MemDot(mem, cx+x-1, cy-y, alpha1)
        // octant 8
        E2DC_MemDot(mem, cx+y, cy-x,   color)
        E2DC_MemDot(mem, cx+y, cy-x-1, alpha2)
        E2DC_MemDot(mem, cx+y, cy-x+1, alpha1)


        t# = cur_dist#
    endwhile

    img = createImageFromMemblock(mem)
    deleteMemblock(mem)
endfunction img



function E2DC_MemDot(id, x, y, color)
    width  = getMemblockInt(id, 0)
    pos = (y*width + x)*4 + 12
    setMemblockInt(id, pos, color)
endfunction



function E2DC_Distance#(a, b)
    real# = sqrt(a*a - b*b)
    d# = ceil(real#) - real#
endfunction d#