code:

#MaxThreadsPerHotkey 2
Pause::Pause
	
F2::
	if (fishing == 1) {
		fishing = 0
		return
	} else fishing = 1

	Loop {
		if (fishing == 1) {			
			manualClick()
			Sleep, 1000
			MouseGetPos xpos, ypos
			PixelGetColor, colorA, xpos, ypos-2
			
			Loop {
				PixelGetColor, colorB, xpos, ypos-2
				if (compare(colorA, colorB) > 5) {
					if (fishing == 1) {
						manualClick()
					}
					break
				} else PixelGetColor, colorA, xpos, ypos-2
			}
		} else break
	}
return

manualClick() {
	Click down
	Sleep, 50
	Click up
	Sleep, 50
}

compare(c1, c2) {
    rdiff := Abs((c1 >> 16) & 0xFF - (c2 >> 16) & 0xFF)
    gdiff := Abs((c1 >> 8) & 0xFF - (c2 >> 8) & 0xFF)
    bdiff := Abs(c1 & 0xFF - c2 & 0xFF)

    return rdiff + gdiff + bdiff
}