code: public ValueGraphElement getElement(int i) {
  		if((i < 0) || (i >= values.length)) {
  			throw new NoSuchElementException();
  		}
  		int minHeight = config.valueMinHeight;
  		
  		// normalize height to value between 0 and 1:
  		float value = ((float) values[i]) / ((float) maxValue);
  		float usableHeight = height - minHeight;
  		int valueHeight = (int) (usableHeight * value) + minHeight;
  		
  		int elX = Graph.xlateX(width, values.length, i);
  		int elW = Graph.xlateX(width, values.length, i+1) - elX;
  		int elY = height - valueHeight;
  		boolean hot = i == highlightValue;
  		return new ValueGraphElement(x + elX, y + elY, elW, valueHeight, hot, config);
  	}
docs: return the i'th ValueGraphElement
  @param i the index of the element to return
  @return the ValueGraphElement at index i