TYLookupTableWidget.cpp

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/*
 * Copyright (C) <2012> <EDF-R&D> <FRANCE>
 * 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 "TYLookupTableWidget.h"
 
#include <cassert>
#include <limits>
 
#include <boost/foreach.hpp>
#include <boost/tuple/tuple.hpp>
#include <boost/math/special_functions/fpclassify.hpp>
 
#include <math.h>
#include <qpainter.h>
#include <qrect.h>
 
#include "Tympan/models/business/TYPalette.h"
 
TYLookupTableWidget::TYLookupTableWidget(const TYPalette* palette, QWidget* parent, const char* name)
    : QWidget(parent), _palette(palette), _rectPal(0)
{
    setObjectName(name);
 
    setFixedHeight(30);
    _rectPal = new QRect(0, 0, width(), height());
}
 
TYLookupTableWidget::~TYLookupTableWidget() {}
 
void TYLookupTableWidget::paintEvent(QPaintEvent*)
{
    QPainter paint(this);
    drawPalette(&paint);
}
 
void TYLookupTableWidget::resizeEvent(QResizeEvent* e)
{
    _rectPal->setSize(e->size());
}
 
void TYLookupTableWidget::drawPalette(QPainter* painter)
{
    size_t nbColors = _palette->getNbColors();
    if (nbColors == 0)
    {
        return;
    }
 
    const int bounds_width = 0.1 * _rectPal->width();
    const int width_but_bounds = _rectPal->width() - 2 * bounds_width;
 
    int x = 0;
    TYPalette::values_type prev_value = -std::numeric_limits<float>::infinity();
 
    TYPalette::values_type value = NAN;
    OColor color;
    BOOST_FOREACH (boost::tie(value, color), _palette->getColorMap())
    {
        // Handle specially first and last iteration
        const int dx =
            boost::math::isinf(value - prev_value)
                ? bounds_width
                : (_palette->normalize(value) - _palette->normalize(prev_value)) * width_but_bounds;
        prev_value = value;
        painter->fillRect(x, _rectPal->top(), x + dx, _rectPal->bottom(), toQColor(color));
        x += dx;
    }
}
 
TYLabeledLookupTableWidget::TYLabeledLookupTableWidget(const TYPalette* palette, QWidget* parent,
                                                       const char* name)
    : QWidget(parent)
{
    if (!parent)
    {
        parent = this;
    }
 
    QGridLayout* pPreviewLayout = new QGridLayout();
    parent->setLayout(pPreviewLayout);
 
    p_scale = new TYLookupTableWidget(palette, this, name);
    p_minBound = new QDoubleSpinBox();
    p_maxBound = new QDoubleSpinBox();
 
    p_minBound->setDecimals(1);
    p_minBound->setReadOnly(true);
    p_minBound->setButtonSymbols(QAbstractSpinBox::NoButtons);
    p_maxBound->setDecimals(1);
    p_maxBound->setReadOnly(true);
    p_maxBound->setButtonSymbols(QAbstractSpinBox::NoButtons);
 
    pPreviewLayout->addWidget(p_scale, 1, 0, 1, 3);
    pPreviewLayout->addWidget(p_minBound, 0, 0, Qt::AlignLeft);
    pPreviewLayout->addWidget(p_maxBound, 0, 2, Qt::AlignRight);
 
    update(palette);
}
 
TYLabeledLookupTableWidget::~TYLabeledLookupTableWidget() {}
 
void TYLabeledLookupTableWidget::update(const TYPalette* palette)
{
    assert(p_scale->_palette == palette && "Inconsistent use of the update slot");
    p_minBound->setValue(p_scale->_palette->getValueMin());
    p_maxBound->setValue(p_scale->_palette->getValueMax());
    p_scale->repaint();
    QWidget::update();
}