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/***************************************************************************
File : QwtBarCurve.cpp
Project : SciDAVis
--------------------------------------------------------------------
Copyright : (C) 2006 by Ion Vasilief, Tilman Benkert
Email (use @ for *) : ion_vasilief*yahoo.fr, thzs*gmx.net
Description : Bar curve
***************************************************************************/
/***************************************************************************
* *
* 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. *
* *
* You should have received a copy of the GNU General Public License *
* along with this program; if not, write to the Free Software *
* Foundation, Inc., 51 Franklin Street, Fifth Floor, *
* Boston, MA 02110-1301 USA *
* *
***************************************************************************/
#include "QwtBarCurve.h"
#include <QPainter>
QwtBarCurve::QwtBarCurve(BarStyle style, Table *t, const QString& xColName, const char *name, int startRow, int endRow):
DataCurve(t, xColName, name, startRow, endRow)
{
bar_offset=0;
bar_gap=0;
bar_style=style;
setPen(QPen(Qt::black, 1, Qt::SolidLine));
setBrush(QBrush(Qt::red));
if (bar_style == Vertical)
setType(Graph::VerticalBars);
else
setType(Graph::HorizontalBars);
}
void QwtBarCurve::copy(const QwtBarCurve *b)
{
bar_gap = b->bar_gap;
bar_offset = b->bar_offset;
bar_style = b->bar_style;
}
void QwtBarCurve::draw(QPainter *painter,
const QwtScaleMap &xMap, const QwtScaleMap &yMap, int from, int to) const
{
if ( !painter || dataSize() <= 0 )
return;
if (to < 0)
to = dataSize() - 1;
painter->save();
painter->setPen(QwtPlotCurve::pen());
painter->setBrush(QwtPlotCurve::brush());
int dx, dy, ref;
double bar_width = 0;
if (bar_style == Vertical)
ref= yMap.transform(1e-100); //smalest positive value for log scales
else
ref= xMap.transform(1e-100);
if (bar_style == Vertical)
{
dx = abs(xMap.transform(x(from+1))-xMap.transform(x(from)));
for (int i=from+2; i<to; i++)
{
int min = abs(xMap.transform(x(i+1))-xMap.transform(x(i)));
if (min <= dx)
dx=min;
}
bar_width = dx*(1-bar_gap*0.01);
}
else
{
dy = abs(yMap.transform(y(from+1))-yMap.transform(y(from)));
for (int i=from+2; i<to; i++)
{
int min = abs(yMap.transform(y(i+1))-yMap.transform(y(i)));
if (min <= dy)
dy=min;
}
bar_width = dy*(1-bar_gap*0.01);
}
const int half_width = int((0.5-bar_offset*0.01)*bar_width);
int bw1 = int(bar_width) + 1;
for (int i=from; i<=to; i++)
{
const int px = xMap.transform(x(i));
const int py = yMap.transform(y(i));
if (bar_style == Vertical)
{
if (y(i) < 0)
painter->drawRect(px-half_width, ref, bw1, (py-ref));
else
painter->drawRect(px-half_width, py, bw1, (ref-py+1));
}
else
{
if (x(i) < 0)
painter->drawRect(px, py-half_width, (ref-px), bw1);
else
painter->drawRect(ref, py-half_width, (px-ref), bw1);
}
}
painter->restore();
}
QwtDoubleRect QwtBarCurve::boundingRect() const
{
QwtDoubleRect rect = QwtPlotCurve::boundingRect();
double n= (double)dataSize();
if (bar_style == Vertical)
{
double dx=(rect.right()-rect.left())/n;
rect.setLeft(rect.left()-dx);
rect.setRight(rect.right()+dx);
}
else
{
double dy=(rect.bottom()-rect.top())/n;
rect.setTop(rect.top()-dy);
rect.setBottom(rect.bottom()+dy);
}
return rect;
}
void QwtBarCurve::setGap (int gap)
{
if (bar_gap == gap)
return;
bar_gap =gap;
}
void QwtBarCurve::setOffset(int offset)
{
if (bar_offset == offset)
return;
bar_offset = offset;
}
double QwtBarCurve::dataOffset()
{
if (bar_style == Vertical)
{
const QwtScaleMap &xMap = plot()->canvasMap(xAxis());
int dx = abs(xMap.transform(x(1))-xMap.transform(x(0)));
double bar_width = dx*(1-bar_gap*0.01);
if (plot()->isVisible())
{
for (int i = 2; i<dataSize(); i++)
{
int min = abs(xMap.transform(x(i))-xMap.transform(x(i-1)));
if (min <= dx)
dx=min;
}
int x1 = xMap.transform(minXValue()) + int(bar_offset*0.01*bar_width);
return xMap.invTransform(x1) - minXValue();
}
else
return 0.5*bar_offset*0.01*bar_width;
}
else
{
const QwtScaleMap &yMap = plot()->canvasMap(yAxis());
int dy = abs(yMap.transform(y(1))-yMap.transform(y(0)));
double bar_width = dy*(1-bar_gap*0.01);
if (plot()->isVisible())
{
for (int i=2; i<dataSize(); i++)
{
int min = abs(yMap.transform(y(i))-yMap.transform(y(i-1)));
if (min <= dy)
dy=min;
}
int y1 = yMap.transform(minYValue()) + int(bar_offset*0.01*bar_width);
return yMap.invTransform(y1) - minYValue();
}
else
return 0.5*bar_offset*0.01*bar_width;
}
return 0;
}
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