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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 "barpresenter_p.h"
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#include "stackedbarpresenter_p.h"
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#include "percentbarpresenter_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 "chartthemevanilla_p.h"
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#include "chartthemeicy_p.h"
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#include "chartthemegrayscale_p.h"
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#include "chartthemescientific_p.h"
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#include "chartthemebluecerulean_p.h"
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#include "chartthemelight_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()),
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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::ChartThemeVanilla:
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return new ChartThemeVanilla();
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case QChart::ChartThemeIcy:
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return new ChartThemeIcy();
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case QChart::ChartThemeGrayscale:
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return new ChartThemeGrayscale();
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case QChart::ChartThemeScientific:
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return new ChartThemeScientific();
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case QChart::ChartThemeBlueCerulean:
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return new ChartThemeBlueCerulean();
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case QChart::ChartThemeLight:
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return new ChartThemeLight();
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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)
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{
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if (m_backgroundShades == BackgroundShadesNone) {
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chart->setChartBackgroundBrush(m_chartBackgroundGradient);
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} else {
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chart->setChartBackgroundBrush(Qt::NoBrush);
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}
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chart->setChartTitleFont(m_masterFont);
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chart->setChartTitleBrush(m_titleBrush);
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}
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void ChartTheme::decorate(QLegend* legend)
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{
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legend->setBackgroundBrush(m_chartBackgroundGradient);
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}
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void ChartTheme::decorate(QAreaSeries* series, int index)
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{
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QPen pen(colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 1.0));
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pen.setWidthF(2);
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series->setPen(pen);
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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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void ChartTheme::decorate(QLineSeries* series,int index)
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{
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QPen pen(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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void ChartTheme::decorate(QBarSeries* series,int index)
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{
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QList<QBarSet*> sets = series->barSets();
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for (int i=0; i<sets.count(); i++) {
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qreal pos = 0.5;
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if (sets.count() > 1)
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pos = (qreal) i / (qreal) (sets.count() - 1);
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QColor c = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), pos);
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sets.at(i)->setBrush(QBrush(c));
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// Pick label color as far as possible from bar color (within gradient).
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// 0.3 is magic number that was picked as value that gave enough contrast with icy theme gradient :)
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// TODO: better picking of label color?
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if (pos < 0.3) {
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c = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 1);
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} else {
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c = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0);
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}
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sets.at(i)->setFloatingValuePen(QPen(c));
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}
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}
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void ChartTheme::decorate(QStackedBarSeries* series,int index)
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{
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QList<QBarSet*> sets = series->barSets();
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for (int i=0; i<sets.count(); i++) {
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qreal pos = 0.5;
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if (sets.count() > 1)
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pos = (qreal) i / (qreal) (sets.count() - 1);
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QColor c = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), pos);
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sets.at(i)->setBrush(QBrush(c));
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if (pos < 0.3) {
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c = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 1);
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} else {
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c = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0);
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}
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sets.at(i)->setFloatingValuePen(QPen(c));
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}
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}
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void ChartTheme::decorate(QPercentBarSeries* series,int index)
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{
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QList<QBarSet*> sets = series->barSets();
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for (int i=0; i<sets.count(); i++) {
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qreal pos = 0.5;
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if (sets.count() > 1)
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pos = (qreal) i / (qreal) (sets.count() - 1);
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QColor c = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), pos);
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sets.at(i)->setBrush(QBrush(c));
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if (pos < 0.3) {
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c = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 1);
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} else {
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c = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0);
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}
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sets.at(i)->setFloatingValuePen(QPen(c));
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}
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}
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void ChartTheme::decorate(QScatterSeries* series, int index)
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{
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QPen pen(colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 1.0));
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pen.setWidthF(2);
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series->setPen(pen);
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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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void ChartTheme::decorate(QPieSeries* series, int index)
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{
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// Get color for a slice from a gradient linearly, beginning from the start of the gradient
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for (int i(0); i < series->slices().count(); i++) {
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qreal pos = (qreal) i / (qreal) series->count();
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QColor penColor = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0.1);
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series->slices().at(i)->setSlicePen(penColor);
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QColor brushColor = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), pos);
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series->slices().at(i)->setSliceBrush(brushColor);
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}
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}
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void ChartTheme::decorate(QSplineSeries* series, int index)
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{
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QPen pen(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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void ChartTheme::decorate(QChartAxis* axis,bool axisX)
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{
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if (axis->isAxisVisible()) {
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axis->setLabelsBrush(m_axisLabelBrush);
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axis->setLabelsPen(Qt::NoPen); // NoPen for performance reasons
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if (m_backgroundShades == BackgroundShadesBoth
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|| (m_backgroundShades == BackgroundShadesVertical && axisX)
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|| (m_backgroundShades == BackgroundShadesHorizontal && !axisX)) {
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axis->setShadesPen(m_backgroundShadesPen);
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axis->setShadesBrush(m_backgroundShadesBrush);
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} else {
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// The shades not supposed to be shown for this axis, clear possible brush and pen
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axis->setShadesPen(Qt::NoPen);
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axis->setShadesBrush(Qt::NoBrush);
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}
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axis->setAxisPen(m_axisLinePen);
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axis->setGridLinePen(m_gridLinePen);
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axis->setLabelsFont(m_masterFont);
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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, 0.05, 0.95);
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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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