use "std"
use "canvas"
g = showcanvas()
IMGW = 150
IMGH = 150
IW13 = IMGW / 3 // 1/3
IW23 = IW13 * 2 // 2/3
IW2  = IMGW / 2 // 1/2

bmpRed = createBitmap(IMGW, IMGH)
gr = bmpRed.getGraphics()
gr.drawColor(#FF000000)
gr.setColor(#FFFF0000)
gr.fillCircle(IW13, IW13, IW13)
pixelsRed = bmpRed.getPixels(0, IMGW, 0, 0, IMGW, IMGH)

bmpGreen = createBitmap(IMGW, IMGH)
gg = bmpGreen.getGraphics()
gg.drawColor(#FF000000)
gg.setColor(#FF00FF00)
gg.fillCircle(IW23, IW13, IW13)
pixelsGreen = bmpGreen.getPixels(0, IMGW, 0, 0, IMGW, IMGH)

bmpBlue = createBitmap(IMGW, IMGH)
gb = bmpBlue.getGraphics()
gb.drawColor(#FF000000)
gb.setColor(#FF0000FF)
gb.fillCircle(IW2, IW23, IW13)
pixelsBlue = bmpBlue.getPixels(0, IMGW, 0, 0, IMGW, IMGH)

len = length(pixelsRed)
pixels = newarray(len)
for i = 0, i < len, i++ {
  pixels[i] = 0xFF000000 | (
        (pixelsRed[i] & 0xFFFFFF) +
        (pixelsGreen[i] & 0xFFFFFF) +
        (pixelsBlue[i] & 0xFFFFFF)
  )
}

result = createBitmap(pixels, 0, IMGW, IMGH, IMGH, 3)
g.drawBitmap(result, 0, 0)