private int pickHandle(int x) {
		int minX = toScreenX(getLowValue());
		int maxX = toScreenX(getHighValue());	
		int pick = PICK_NONE;
	
		if (x >= minX && x <= minX + 11) {
		    pick = PICK_MIN;
		}
		else if (x <= maxX && x >= maxX - 10) {
		    pick = PICK_MAX;
		}
		else if (x > minX + 11 && x < maxX - 10) {
			pick = PICK_MID;
		}
		return pick;
    }