#include "graph.h"

#include "applicationsettings.h"

#include <QDir>

#include <QDomDocument>

#include <QDomElement>

#include <QPainter>

Graph::Graph(QWidget *parent) :

QWidget(parent)

{

}

void Graph::trend(const QString &projectName)

{

values.clear();

datetimes.clear();

ApplicationSettings settings;

QDir dir(settings.resultsFolder);

dir.setSorting(QDir::Name);

dir.setNameFilters(QStringList() << "*.xml");

dir.setFilter(QDir::Files | QDir::NoDotAndDotDot);

foreach(const QFileInfo fileinfo, dir.entryInfoList()) {

const QString filename = fileinfo.canonicalFilePath();

QFile file(filename);

if (!file.open(QIODevice::ReadOnly | QIODevice::Text))

continue;

QDomDocument doc;

if (!doc.setContent(&file))

continue;

const QDomElement rootElement = doc.documentElement();

if (rootElement.tagName() != "results")

continue;

const QDomElement metaElement = rootElement.firstChildElement("meta");

if (metaElement.isNull())

continue;

const QDomElement projectElement = metaElement.firstChildElement("project");

if (projectElement.text() != projectName)

continue;

int results = 0;

for (QDomElement child = rootElement.firstChildElement("results"); !child.isNull(); child = child.nextSiblingElement())

++results;

values.append(results);

datetimes.append(fileinfo.baseName().mid(0,10));

}

if (isVisible())

update();

}

static void drawLineGraph(QPainter *painter, int left, int top, int width, int height, const int values[], int numberOfValues)

{

int maxvalue = 0;

for (int i = 0; i < numberOfValues; i++) {

if (values[i] > maxvalue)

maxvalue = values[i];

}

painter->setPen(Qt::gray);

painter->setBrush(Qt::white);

painter->drawRect(left,top,width,height);

const int bottom = top + height;

const int w = width - 2;

const int h = height - 2;

painter->setPen(Qt::red);

for (int i = 1; i < numberOfValues; i++) {

painter->drawLine(left + 1 + (i-1) * w / (numberOfValues - 1),

bottom - 1 - (h * values[i-1]) / maxvalue,

left + 1 + i * w / (numberOfValues - 1),

bottom - 1 - (h * values[i]) / maxvalue);

}

}

void Graph::paintEvent(QPaintEvent * /*event*/)

{

QPainter painter(this);

painter.fillRect(rect(),Qt::white);

drawLineGraph(&painter,50,50,width()-100,height()-100,&values[0],values.size());

}