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/****************************************************************************
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**
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** Copyright (C) 2012 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.digia.com
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**
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** This file is part of the Qt Commercial Charts Add-on.
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**
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** $QT_BEGIN_LICENSE$
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** Licensees holding valid Qt Commercial licenses may use this file in
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** accordance with the Qt Commercial License Agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.digia.com
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "charttheme_p.h"
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#include "qchart.h"
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#include "qchartview.h"
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#include "qlegend.h"
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#include "qchartaxis.h"
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#include <QTime>
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//series
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#include "qbarset.h"
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#include "qbarseries.h"
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#include "qstackedbarseries.h"
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#include "qpercentbarseries.h"
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#include "qlineseries.h"
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#include "qareaseries.h"
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#include "qscatterseries.h"
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#include "qpieseries.h"
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#include "qpieslice.h"
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#include "qsplineseries.h"
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//items
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#include "axisitem_p.h"
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#include "barchartitem_p.h"
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#include "stackedbarchartitem_p.h"
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#include "percentbarchartitem_p.h"
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#include "linechartitem_p.h"
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#include "areachartitem_p.h"
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#include "scatterchartitem_p.h"
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#include "piechartitem_p.h"
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#include "splinechartitem_p.h"
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//themes
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#include "chartthemedefault_p.h"
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#include "chartthemelight_p.h"
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#include "chartthemebluecerulean_p.h"
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#include "chartthemedark_p.h"
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#include "chartthemebrownsand_p.h"
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#include "chartthemebluencs_p.h"
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#include "chartthemehighcontrast_p.h"
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#include "chartthemeblueicy_p.h"
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QTCOMMERCIALCHART_BEGIN_NAMESPACE
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ChartTheme::ChartTheme(QChart::ChartTheme id) :
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m_masterFont(QFont("arial", 12)),
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m_labelFont(QFont("arial", 10)),
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m_titleBrush(QColor(QRgb(0x000000))),
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m_axisLinePen(QPen(QRgb(0x000000))),
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m_axisLabelBrush(QColor(QRgb(0x000000))),
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m_backgroundShadesPen(Qt::NoPen),
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m_backgroundShadesBrush(Qt::NoBrush),
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m_backgroundShades(BackgroundShadesNone),
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m_gridLinePen(QPen(QRgb(0x000000)))
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{
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m_id = id;
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qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
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}
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ChartTheme* ChartTheme::createTheme(QChart::ChartTheme theme)
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{
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switch(theme) {
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case QChart::ChartThemeLight:
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return new ChartThemeLight();
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case QChart::ChartThemeBlueCerulean:
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return new ChartThemeBlueCerulean();
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case QChart::ChartThemeDark:
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return new ChartThemeDark();
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case QChart::ChartThemeBrownSand:
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return new ChartThemeBrownSand();
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case QChart::ChartThemeBlueNcs:
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return new ChartThemeBlueNcs();
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case QChart::ChartThemeHighContrast:
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return new ChartThemeHighContrast();
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case QChart::ChartThemeBlueIcy:
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return new ChartThemeBlueIcy();
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default:
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return new ChartThemeDefault();
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}
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}
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void ChartTheme::decorate(QChart* chart,bool force)
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{
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QBrush brush;
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if(brush == chart->backgroundBrush() || force)
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chart->setBackgroundBrush(m_chartBackgroundGradient);
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chart->setTitleFont(m_masterFont);
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chart->setTitleBrush(m_titleBrush);
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}
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void ChartTheme::decorate(QLegend* legend,bool force)
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{
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QPen pen;
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QBrush brush;
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if (pen == legend->pen() || force){
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legend->setPen(Qt::NoPen);
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}
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if (brush == legend->brush() || force) {
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legend->setBrush(m_chartBackgroundGradient);
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}
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}
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void ChartTheme::decorate(QAreaSeries* series, int index,bool force)
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{
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QPen pen;
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QBrush brush;
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if (pen == series->pen() || force){
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pen.setColor(colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0.0));
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pen.setWidthF(2);
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series->setPen(pen);
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}
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if (brush == series->brush() || force) {
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QBrush brush(m_seriesColors.at(index % m_seriesColors.size()));
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series->setBrush(brush);
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}
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}
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void ChartTheme::decorate(QLineSeries* series,int index,bool force)
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{
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QPen pen;
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if(pen == series->pen() || force ){
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pen.setColor(m_seriesColors.at(index%m_seriesColors.size()));
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pen.setWidthF(2);
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series->setPen(pen);
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}
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}
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void ChartTheme::decorate(QBarSeries* series, int index, bool force)
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{
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QBrush brush;
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QPen pen;
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QList<QBarSet*> sets = series->barSets();
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qreal takeAtPos = 0.5;
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qreal step = 0.2;
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if (sets.count() > 1 ) {
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step = 1.0 / (qreal) sets.count();
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if (sets.count() % m_seriesGradients.count())
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step *= m_seriesGradients.count();
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else
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step *= (m_seriesGradients.count() - 1);
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}
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for (int i(0); i < sets.count(); i++) {
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int colorIndex = (index + i) % m_seriesGradients.count();
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if (i > 0 && i % m_seriesGradients.count() == 0) {
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// There is no dedicated base color for each sets, generate more colors
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takeAtPos += step;
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if (takeAtPos == 1.0)
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takeAtPos += step;
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takeAtPos -= (int) takeAtPos;
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}
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qDebug() << "pos:" << takeAtPos;
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if (brush == sets.at(i)->brush() || force )
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sets.at(i)->setBrush(colorAt(m_seriesGradients.at(colorIndex), takeAtPos));
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// Pick label color from the opposite end of the gradient.
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// 0.3 as a boundary seems to work well.
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if (takeAtPos < 0.3)
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sets.at(i)->setLabelBrush(colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 1));
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else
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sets.at(i)->setLabelBrush(colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0));
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if (pen == sets.at(i)->pen() || force) {
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QColor c = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0.0);
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sets.at(i)->setPen(c);
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}
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}
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}
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void ChartTheme::decorate(QScatterSeries* series, int index,bool force)
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{
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QPen pen;
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QBrush brush;
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if (pen == series->pen() || force) {
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pen.setColor(colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0.0));
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pen.setWidthF(2);
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series->setPen(pen);
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}
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if (brush == series->brush() || force) {
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QBrush brush(m_seriesColors.at(index % m_seriesColors.size()));
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series->setBrush(brush);
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}
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}
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void ChartTheme::decorate(QPieSeries* series, int index, bool force)
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{
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for (int i(0); i < series->slices().count(); i++) {
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QColor penColor = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0.0);
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// Get color for a slice from a gradient linearly, beginning from the start of the gradient
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qreal pos = (qreal) (i + 1) / (qreal) series->count();
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QColor brushColor = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), pos);
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QPieSlice *s = series->slices().at(i);
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PieSliceData data = PieSliceData::data(s);
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if (data.m_slicePen.isThemed() || force) {
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data.m_slicePen = penColor;
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data.m_slicePen.setThemed(true);
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}
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if (data.m_sliceBrush.isThemed() || force) {
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data.m_sliceBrush = brushColor;
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data.m_sliceBrush.setThemed(true);
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}
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if (data.m_labelPen.isThemed() || force) {
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data.m_labelPen = QPen(m_titleBrush.color());
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data.m_labelPen.setThemed(true);
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}
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if (data.m_labelFont.isThemed() || force) {
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data.m_labelFont = m_labelFont;
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data.m_labelFont.setThemed(true);
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}
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if (PieSliceData::data(s) != data) {
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PieSliceData::data(s) = data;
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emit PieSliceData::data(s).emitChangedSignal(s);
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}
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}
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}
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void ChartTheme::decorate(QSplineSeries* series, int index, bool force)
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{
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QPen pen;
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if(pen == series->pen() || force){
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pen.setColor(m_seriesColors.at(index%m_seriesColors.size()));
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pen.setWidthF(2);
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series->setPen(pen);
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}
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}
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void ChartTheme::decorate(QChartAxis* axis,bool axisX, bool force)
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{
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QPen pen;
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QBrush brush;
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QFont font;
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if (axis->isAxisVisible()) {
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if(brush == axis->labelsBrush() || force){
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axis->setLabelsBrush(m_axisLabelBrush);
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}
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if(pen == axis->labelsPen() || force){
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axis->setLabelsPen(Qt::NoPen); // NoPen for performance reasons
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}
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if (axis->shadesVisible() || force) {
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if(brush == axis->shadesBrush() || force){
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axis->setShadesBrush(m_backgroundShadesBrush);
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}
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if(pen == axis->shadesPen() || force){
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axis->setShadesPen(m_backgroundShadesPen);
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}
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if(force && (m_backgroundShades == BackgroundShadesBoth
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|| (m_backgroundShades == BackgroundShadesVertical && axisX)
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|| (m_backgroundShades == BackgroundShadesHorizontal && !axisX))){
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axis->setShadesVisible(true);
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}
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}
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if(pen == axis->axisPen() || force){
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axis->setAxisPen(m_axisLinePen);
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}
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if(pen == axis->gridLinePen() || force){
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axis->setGridLinePen(m_gridLinePen);
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}
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if(font == axis->labelsFont() || force){
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axis->setLabelsFont(m_labelFont);
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}
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}
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}
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void ChartTheme::generateSeriesGradients()
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{
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// Generate gradients in HSV color space
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foreach (QColor color, m_seriesColors) {
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QLinearGradient g;
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qreal h = color.hsvHueF();
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qreal s = color.hsvSaturationF();
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// TODO: tune the algorithm to give nice results with most base colors defined in
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// most themes. The rest of the gradients we can define manually in theme specific
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// implementation.
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QColor start = color;
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start.setHsvF(h, 0.0, 1.0);
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g.setColorAt(0.0, start);
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g.setColorAt(0.5, color);
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QColor end = color;
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end.setHsvF(h, s, 0.25);
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g.setColorAt(1.0, end);
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m_seriesGradients << g;
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}
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}
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QColor ChartTheme::colorAt(const QColor &start, const QColor &end, qreal pos)
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{
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Q_ASSERT(pos >=0.0 && pos <= 1.0);
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qreal r = start.redF() + ((end.redF() - start.redF()) * pos);
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qreal g = start.greenF() + ((end.greenF() - start.greenF()) * pos);
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qreal b = start.blueF() + ((end.blueF() - start.blueF()) * pos);
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QColor c;
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c.setRgbF(r, g, b);
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return c;
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}
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QColor ChartTheme::colorAt(const QGradient &gradient, qreal pos)
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{
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Q_ASSERT(pos >=0 && pos <= 1.0);
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// another possibility:
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// http://stackoverflow.com/questions/3306786/get-intermediate-color-from-a-gradient
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QGradientStops stops = gradient.stops();
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int count = stops.count();
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// find previous stop relative to position
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QGradientStop prev = stops.first();
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for (int i=0; i<count; i++) {
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QGradientStop stop = stops.at(i);
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if (pos > stop.first)
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prev = stop;
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// given position is actually a stop position?
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if (pos == stop.first) {
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//qDebug() << "stop color" << pos;
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return stop.second;
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}
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}
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// find next stop relative to position
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QGradientStop next = stops.last();
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for (int i=count-1; i>=0; i--) {
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QGradientStop stop = stops.at(i);
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if (pos < stop.first)
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next = stop;
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}
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//qDebug() << "prev" << prev.first << "pos" << pos << "next" << next.first;
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qreal range = next.first - prev.first;
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qreal posDelta = pos - prev.first;
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qreal relativePos = posDelta / range;
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//qDebug() << "range" << range << "posDelta" << posDelta << "relativePos" << relativePos;
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return colorAt(prev.second, next.second, relativePos);
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}
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QTCOMMERCIALCHART_END_NAMESPACE
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