twoFingersMoveUp.swift

    private func twoFingersMoveUp() -> Bool {
        var firstFingerWasMoveUp = false
        if firstTouchedPoints.count > 1 && firstTouchedPoints[0].y > firstTouchedPoints[firstTouchedPoints.count - 1].y {
            firstFingerWasMoveUp = true
        }
        
        var secondFingerWasMoveUp = false
        if secondTouchedPoints.count > 1 && secondTouchedPoints[0].y > secondTouchedPoints[secondTouchedPoints.count - 1].y {
            secondFingerWasMoveUp = true
        }
        
        return firstFingerWasMoveUp && secondFingerWasMoveUp
    }
    
    private func twoFingersMoveDown() -> Bool {
        var firstFingerWasMoveDown = false
        if firstTouchedPoints.count > 1 &&  firstTouchedPoints[0].y < firstTouchedPoints[firstTouchedPoints.count - 1].y {
            firstFingerWasMoveDown = true
        }
        
        var secondFingerWasMoveDown = false
        if secondTouchedPoints.count > 1 && secondTouchedPoints[0].y < secondTouchedPoints[secondTouchedPoints.count - 1].y {
            secondFingerWasMoveDown = true
        }
        
        return firstFingerWasMoveDown && secondFingerWasMoveDown
    }