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Viewing changes to scidavis/src/QwtBarCurve.cpp

  • Committer: Bazaar Package Importer
  • Author(s): Ruben Molina
  • Date: 2009-09-06 11:34:04 UTC
  • Revision ID: james.westby@ubuntu.com-20090906113404-4awaey82l3686w4q
Tags: upstream-0.2.3
Import upstream version 0.2.3

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scidavis/src/QwtBarCurve.cpp
 
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/***************************************************************************
 
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    File                 : QwtBarCurve.cpp
 
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    Project              : SciDAVis
 
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    --------------------------------------------------------------------
 
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    Copyright            : (C) 2006 by Ion Vasilief, Tilman Benkert
 
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    Email (use @ for *)  : ion_vasilief*yahoo.fr, thzs*gmx.net
 
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    Description          : Bar curve
 
8
 
 
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 ***************************************************************************/
 
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/***************************************************************************
 
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 *                                                                         *
 
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 *  This program is free software; you can redistribute it and/or modify   *
 
14
 *  it under the terms of the GNU General Public License as published by   *
 
15
 *  the Free Software Foundation; either version 2 of the License, or      *
 
16
 *  (at your option) any later version.                                    *
 
17
 *                                                                         *
 
18
 *  This program is distributed in the hope that it will be useful,        *
 
19
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of         *
 
20
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the          *
 
21
 *  GNU General Public License for more details.                           *
 
22
 *                                                                         *
 
23
 *   You should have received a copy of the GNU General Public License     *
 
24
 *   along with this program; if not, write to the Free Software           *
 
25
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor,                    *
 
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 *   Boston, MA  02110-1301  USA                                           *
 
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 *                                                                         *
 
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 ***************************************************************************/
 
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#include "QwtBarCurve.h"
 
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#include <QPainter>
 
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QwtBarCurve::QwtBarCurve(BarStyle style, Table *t, const QString& xColName, const char *name, int startRow, int endRow):
 
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    DataCurve(t, xColName, name, startRow, endRow)
 
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{
 
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bar_offset=0;
 
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bar_gap=0;
 
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bar_style=style;
 
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setPen(QPen(Qt::black, 1, Qt::SolidLine));
 
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setBrush(QBrush(Qt::red));
 
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if (bar_style == Vertical)
 
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        setType(Graph::VerticalBars);
 
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else
 
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        setType(Graph::HorizontalBars);
 
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}
 
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void QwtBarCurve::copy(const QwtBarCurve *b)
 
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{
 
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bar_gap = b->bar_gap;
 
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bar_offset = b->bar_offset;
 
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bar_style = b->bar_style;
 
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}
 
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void QwtBarCurve::draw(QPainter *painter,
 
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    const QwtScaleMap &xMap, const QwtScaleMap &yMap, int from, int to) const
 
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{
 
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   if ( !painter || dataSize() <= 0 )
 
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        return;
 
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    if (to < 0)
 
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        to = dataSize() - 1;
 
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    painter->save();
 
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    painter->setPen(QwtPlotCurve::pen());
 
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    painter->setBrush(QwtPlotCurve::brush());
 
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    int dx, dy, ref;
 
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        double bar_width = 0;
 
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    if (bar_style == Vertical)
 
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       ref= yMap.transform(1e-100); //smalest positive value for log scales
 
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    else
 
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       ref= xMap.transform(1e-100);
 
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        if (bar_style == Vertical)
 
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        {
 
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                dx = abs(xMap.transform(x(from+1))-xMap.transform(x(from)));
 
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                for (int i=from+2; i<to; i++)
 
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                {
 
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                        int min = abs(xMap.transform(x(i+1))-xMap.transform(x(i)));
 
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                        if (min <= dx)
 
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                                dx=min;
 
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                }
 
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                bar_width = dx*(1-bar_gap*0.01);
 
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        }
 
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        else
 
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        {
 
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                dy = abs(yMap.transform(y(from+1))-yMap.transform(y(from)));
 
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                for (int i=from+2; i<to; i++)
 
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                {
 
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                        int min = abs(yMap.transform(y(i+1))-yMap.transform(y(i)));
 
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                        if (min <= dy)
 
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                                dy=min;
 
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                }
 
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                bar_width = dy*(1-bar_gap*0.01);
 
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        }
 
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        const int half_width = int((0.5-bar_offset*0.01)*bar_width);
 
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        int bw1 = int(bar_width) + 1;
 
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        for (int i=from; i<=to; i++)
 
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        {
 
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                const int px = xMap.transform(x(i));
 
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        const int py = yMap.transform(y(i));
 
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                if (bar_style == Vertical)
 
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                {
 
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                        if (y(i) < 0)
 
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                                painter->drawRect(px-half_width, ref, bw1, (py-ref));
 
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                        else
 
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                                painter->drawRect(px-half_width, py, bw1, (ref-py+1));
 
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                }
 
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                else
 
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                {
 
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                        if (x(i) < 0)
 
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                                painter->drawRect(px, py-half_width, (ref-px), bw1);
 
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                        else
 
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                                painter->drawRect(ref, py-half_width, (px-ref), bw1);
 
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                }
 
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        }
 
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        painter->restore();
 
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}
 
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QwtDoubleRect QwtBarCurve::boundingRect() const
 
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{
 
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QwtDoubleRect rect = QwtPlotCurve::boundingRect();
 
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double n= (double)dataSize();
 
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if (bar_style == Vertical)
 
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        {
 
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        double dx=(rect.right()-rect.left())/n;
 
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        rect.setLeft(rect.left()-dx);
 
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        rect.setRight(rect.right()+dx);
 
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        }
 
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else
 
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        {
 
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        double dy=(rect.bottom()-rect.top())/n;
 
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        rect.setTop(rect.top()-dy);
 
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        rect.setBottom(rect.bottom()+dy);
 
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        }
 
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return rect;
 
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}
 
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void QwtBarCurve::setGap (int gap)
 
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{
 
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if (bar_gap == gap)
 
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        return;
 
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bar_gap =gap;
 
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}
 
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void QwtBarCurve::setOffset(int offset)
 
154
{
 
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if (bar_offset == offset)
 
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        return;
 
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bar_offset = offset;
 
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}
 
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double QwtBarCurve::dataOffset()
 
162
{
 
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        if (bar_style == Vertical)
 
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        {
 
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                const QwtScaleMap &xMap = plot()->canvasMap(xAxis());
 
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                int dx = abs(xMap.transform(x(1))-xMap.transform(x(0)));
 
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                double bar_width = dx*(1-bar_gap*0.01);
 
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                if (plot()->isVisible())
 
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                {
 
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                        for (int i = 2; i<dataSize(); i++)
 
171
                        {
 
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                                int min = abs(xMap.transform(x(i))-xMap.transform(x(i-1)));
 
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                                if (min <= dx)
 
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                                        dx=min;
 
175
                        }
 
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                        int x1 = xMap.transform(minXValue()) + int(bar_offset*0.01*bar_width);
 
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                        return xMap.invTransform(x1) - minXValue();
 
178
                }
 
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                else
 
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                        return 0.5*bar_offset*0.01*bar_width;
 
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        }
 
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        else
 
183
        {
 
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                const QwtScaleMap &yMap = plot()->canvasMap(yAxis());
 
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                int dy = abs(yMap.transform(y(1))-yMap.transform(y(0)));
 
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                double bar_width = dy*(1-bar_gap*0.01);
 
187
                if (plot()->isVisible())
 
188
                {
 
189
                        for (int i=2; i<dataSize(); i++)
 
190
                        {
 
191
                                int min = abs(yMap.transform(y(i))-yMap.transform(y(i-1)));
 
192
                                if (min <= dy)
 
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                                        dy=min;
 
194
                        }
 
195
                        int y1 = yMap.transform(minYValue()) + int(bar_offset*0.01*bar_width);
 
196
                        return yMap.invTransform(y1) - minYValue();
 
197
                }
 
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                else
 
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                        return 0.5*bar_offset*0.01*bar_width;
 
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        }
 
201
return 0;
 
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}