src/graph.cpp

/***************************************************************************
                                 graph.cpp
                             -------------------
    begin                : Sat Sep 29 2001
    copyright            : (C) 2001 - 2007 by Roland Riegel
    email                : feedback@roland-riegel.de
 ***************************************************************************/

/***************************************************************************
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 ***************************************************************************/

#include "graph.h"
#include "setting.h"
#include "settingstore.h"
#include "window.h"

using namespace std;

Graph::Graph()
{
	m_heightofbars = 0;
}

Graph::~Graph()
{
}

// sets the number of the graph's vertical #-bars
void Graph::setNumOfBars(int new_numofbars)
{
	// logically wrong: number of #-bars has always to be positive
	if(new_numofbars <= 0)
        return;
	
	// vertically resize the graph's value list
	m_values.resize(new_numofbars);
}

// sets the height of the graph's vertical #-bars
void Graph::setHeightOfBars(int new_heightofbars)
{
	m_heightofbars = new_heightofbars;
}

// new traffic measurement has been made => update the graph's value list
void Graph::update(int new_value)
{
	// [new_value] = Bytes/s
	
	if(m_values.size() == 0) return;
	
	// put new value to the beginning of the list, it becomes the first #-bar
	m_values.push_front(new_value);
	// delete the last #-bar of the list
	m_values.pop_back();
	
}

// print the graph with the upper left corner at the coordinates (x, y)
void Graph::print(Window& window, int x, int y)
{
	window.setXY(x, y);
	
	// cycle through through the lines
	for(int l = 0; l < m_heightofbars; l++)
	{
		// for each line cycle through the rows
		for(list<int>::reverse_iterator r = m_values.rbegin(); r != m_values.rend() ; r++)
		{
			int trafficperline = trafficWithMaxDeflectionOfBars() / m_heightofbars;
			int restoftraffic = ((*r) - (m_heightofbars - l - 1) * trafficperline) % trafficperline;
			if((float) (*r) / trafficWithMaxDeflectionOfBars() >= (float) (m_heightofbars - l) / m_heightofbars)
				window.print('#');
			else if(restoftraffic >= 0.7 * trafficperline)
				window.print('|');
			else if(restoftraffic >= 0.3 * trafficperline)
				window.print('.');
			else
				window.print(' ');
		}
		window.print('\n');
		window.setX(x);
	}
	
}

// reset all traffic values in the graph to zero
void Graph::resetTrafficData()
{
	int size = m_values.size();
	m_values.clear();
	m_values.resize(size);
}

long Graph::trafficWithMaxDeflectionOfBars()
{
	int tr = SettingStore::get("bar_max_in"); // TODO: use "bar_max_out" as well
	return tr * 1024 / 8; // recalculate from kBit/s to Bytes/s
}