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/*
* Copyright (c) 2007-2008, Aconex. All Rights Reserved.
*
* 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.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include <QtCore/QEvent>
#include <QtCore/QDateTime>
#include <QtGui/QResizeEvent>
#include <qwt_plot_renderer.h>
#include <qwt_scale_draw.h>
#include <qwt_scale_widget.h>
#include <qwt_text.h>
#include <qwt_text_label.h>
#include "timeaxis.h"
#include "main.h"
#define DESPERATE 0
class TimeScaleDraw: public QwtScaleDraw
{
public:
TimeScaleDraw(void) :QwtScaleDraw() { }
virtual QwtText label(double v) const
{
struct tm tm;
QString string;
time_t seconds = (time_t)v;
pmLocaltime(&seconds, &tm);
string.sprintf("%02d:%02d:%02d", tm.tm_hour, tm.tm_min, tm.tm_sec);
return string;
}
virtual void getBorderDistHint(const QFont &f, int &start, int &end) const
{
if (orientation() == Qt::Horizontal) {
start = 0;
end = 0;
}
else {
QwtScaleDraw::getBorderDistHint(f, start, end);
}
}
};
TimeAxis::TimeAxis(QWidget *parent) : QwtPlot(parent)
{
clearScaleCache();
setFocusPolicy(Qt::NoFocus);
}
void TimeAxis::init()
{
enableAxis(xTop, false);
enableAxis(yLeft, false);
enableAxis(yRight, false);
enableAxis(xBottom, true);
setAutoReplot(false);
setAxisFont(QwtPlot::xBottom, *globalFont);
setAxisScaleDraw(QwtPlot::xBottom, new TimeScaleDraw());
setAxisLabelAlignment(QwtPlot::xBottom, Qt::AlignHCenter | Qt::AlignBottom);
}
void TimeAxis::resetFont()
{
setAxisFont(QwtPlot::xBottom, *globalFont);
}
void TimeAxis::print(QPainter *qp, QRect &rect, bool transparent)
{
QwtPlotRenderer renderer;
if (transparent)
renderer.setDiscardFlag(QwtPlotRenderer::DiscardBackground);
renderer.render(this, qp, rect);
}
void TimeAxis::noArchiveSources()
{
setAxisScale(QwtPlot::xBottom, 0, 1, 0);
replot();
}
void TimeAxis::clearScaleCache()
{
my.points = 0;
my.delta = my.scale = 0.0;
}
double TimeAxis::scaleValue(double delta, int points)
{
if (my.delta == delta && my.points == points)
return my.scale;
// divisor is the amount of space (pixels) set aside for one major label.
int maxMajor = qMax(1, width() / 54);
int maxMinor;
my.scale = (1.0 / ((double)width() / (points * 8.0))) * 8.0; // 8.0 is magic
my.scale *= delta;
// This is a sliding scale which converts arbitrary steps into more
// human-digestable increments - seconds, ten seconds, minutes, etc.
if (my.scale <= 10.0) {
maxMinor = 10;
} else if (my.scale <= 20.0) { // two-seconds up to 20 seconds
my.scale = floor((my.scale + 1) / 2) * 2.0;
maxMinor = 10;
} else if (my.scale <= 60.0) { // ten-secondly up to a minute
my.scale = floor((my.scale + 5) / 10) * 10.0;
maxMinor = 10;
} else if (my.scale <= 600.0) { // minutely up to ten minutes
my.scale = floor((my.scale + 30) / 60) * 60.0;
maxMinor = 10;
} else if (my.scale < 3600.0) { // 10 minutely up to an hour
my.scale = floor((my.scale + 300) / 600) * 600.0;
maxMinor = 6;
} else if (my.scale < 86400.0) { // hourly up to a day
my.scale = floor((my.scale + 1800) / 3600) * 3600.0;
maxMinor = 24;
} else { // daily then on (60 * 60 * 24)
my.scale = 86400.0;
maxMinor = 10;
}
#if DESPERATE
console->post(PmChart::DebugForce, "TimeAxis::scaleValue"
" width=%d points=%d scale=%.2f delta=%.2f maj=%d min=%d\n",
width(), points, my.scale, delta, maxMajor, maxMinor);
#endif
my.delta = delta;
my.points = points;
setAxisMaxMajor(xBottom, maxMajor);
setAxisMaxMinor(xBottom, maxMinor);
return my.scale;
}
//
// Update the time axis if width changes, idea is to display increased
// precision as more screen real estate becomes available. scaleValue
// is the critical piece of code in implementing it, as it uses width().
//
void TimeAxis::resizeEvent(QResizeEvent *e)
{
QwtPlot::resizeEvent(e);
if (e->size().width() != e->oldSize().width()) {
clearScaleCache();
activeGroup->updateTimeAxis();
}
}
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