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charttheme.cpp
380 lines | 10.8 KiB | text/x-c | CppLexer
#include "charttheme_p.h"
#include "qchart.h"
#include "qchartview.h"
#include "qlegend.h"
#include "qchartaxis.h"
#include <QTime>
//series
#include "qbarset.h"
#include "qbarseries.h"
#include "qstackedbarseries.h"
#include "qpercentbarseries.h"
#include "qlineseries.h"
#include "qareaseries.h"
#include "qscatterseries.h"
#include "qpieseries.h"
#include "qpieslice.h"
#include "qsplineseries.h"
//items
#include "axisitem_p.h"
#include "barchartitem_p.h"
#include "stackedbarchartitem_p.h"
#include "percentbarchartitem_p.h"
#include "linechartitem_p.h"
#include "areachartitem_p.h"
#include "scatterchartitem_p.h"
#include "piechartitem_p.h"
#include "splinechartitem_p.h"
//themes
#include "chartthemedefault_p.h"
#include "chartthemelight_p.h"
#include "chartthemebluecerulean_p.h"
#include "chartthemedark_p.h"
#include "chartthemebrownsand_p.h"
#include "chartthemebluencs_p.h"
#include "chartthemeicy_p.h"
#include "chartthemescientific_p.h"
QTCOMMERCIALCHART_BEGIN_NAMESPACE
ChartTheme::ChartTheme(QChart::ChartTheme id) :
m_masterFont(QFont("arial", 12)),
m_labelFont(QFont("arial", 10)),
m_titleBrush(QColor(QRgb(0x000000))),
m_axisLinePen(QPen(QRgb(0x000000))),
m_axisLabelBrush(QColor(QRgb(0x000000))),
m_backgroundShadesPen(Qt::NoPen),
m_backgroundShadesBrush(Qt::NoBrush),
m_backgroundShades(BackgroundShadesNone),
m_gridLinePen(QPen(QRgb(0x000000)))
{
m_id = id;
qsrand(QTime(0,0,0).secsTo(QTime::currentTime()));
}
ChartTheme* ChartTheme::createTheme(QChart::ChartTheme theme)
{
switch(theme) {
case QChart::ChartThemeLight:
return new ChartThemeLight();
case QChart::ChartThemeBlueCerulean:
return new ChartThemeBlueCerulean();
case QChart::ChartThemeDark:
return new ChartThemeDark();
case QChart::ChartThemeBrownSand:
return new ChartThemeBrownSand();
case QChart::ChartThemeBlueNcs:
return new ChartThemeBlueNcs();
case QChart::ChartThemeIcy:
return new ChartThemeIcy();
case QChart::ChartThemeScientific:
return new ChartThemeScientific();
default:
return new ChartThemeDefault();
}
}
void ChartTheme::decorate(QChart* chart,bool force)
{
QPen pen;
QBrush brush;
if(brush == chart->backgroundBrush() || force)
{
if (m_backgroundShades == BackgroundShadesNone) {
chart->setBackgroundBrush(m_chartBackgroundGradient);
}
else {
chart->setBackgroundBrush(Qt::NoBrush);
}
}
chart->setTitleFont(m_masterFont);
chart->setTitleBrush(m_titleBrush);
}
void ChartTheme::decorate(QLegend* legend,bool force)
{
QPen pen;
QBrush brush;
if (pen == legend->pen() || force){
//TODO:: legend->setPen();
}
if (brush == legend->brush() || force) {
legend->setBrush(m_chartBackgroundGradient);
}
}
void ChartTheme::decorate(QAreaSeries* series, int index,bool force)
{
QPen pen;
QBrush brush;
if (pen == series->pen() || force){
pen.setColor(colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0.0));
pen.setWidthF(2);
series->setPen(pen);
}
if (brush == series->brush() || force) {
QBrush brush(m_seriesColors.at(index % m_seriesColors.size()));
series->setBrush(brush);
}
}
void ChartTheme::decorate(QLineSeries* series,int index,bool force)
{
QPen pen;
if(pen == series->pen() || force ){
pen.setColor(m_seriesColors.at(index%m_seriesColors.size()));
pen.setWidthF(2);
series->setPen(pen);
}
}
void ChartTheme::decorate(QBarSeries* series, int index, bool force)
{
QBrush brush;
QPen pen;
QList<QBarSet*> sets = series->barSets();
qreal takeAtPos = 0.5;
qreal step = 0.2;
if (sets.count() > 1 ) {
step = 1.0 / (qreal) sets.count();
if (sets.count() % m_seriesGradients.count())
step *= m_seriesGradients.count();
else
step *= (m_seriesGradients.count() - 1);
}
for (int i(0); i < sets.count(); i++) {
int colorIndex = (index + i) % m_seriesGradients.count();
if (i > 0 && i % m_seriesGradients.count() == 0) {
// There is no dedicated base color for each sets, generate more colors
takeAtPos += step;
if (takeAtPos == 1.0)
takeAtPos += step;
takeAtPos -= (int) takeAtPos;
}
qDebug() << "pos:" << takeAtPos;
if (brush == sets.at(i)->brush() || force )
sets.at(i)->setBrush(colorAt(m_seriesGradients.at(colorIndex), takeAtPos));
// Pick label color from the opposite end of the gradient.
// 0.3 as a boundary seems to work well.
if (takeAtPos < 0.3)
sets.at(i)->setFloatingValuePen(colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 1));
else
sets.at(i)->setFloatingValuePen(colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0));
if (pen == sets.at(i)->pen() || force) {
QColor c = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0.0);
sets.at(i)->setPen(c);
}
}
}
void ChartTheme::decorate(QScatterSeries* series, int index,bool force)
{
QPen pen;
QBrush brush;
if (pen == series->pen() || force) {
pen.setColor(colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0.0));
pen.setWidthF(2);
series->setPen(pen);
}
if (brush == series->brush() || force) {
QBrush brush(m_seriesColors.at(index % m_seriesColors.size()));
series->setBrush(brush);
}
}
void ChartTheme::decorate(QPieSeries* series, int index, bool force)
{
for (int i(0); i < series->slices().count(); i++) {
QColor penColor = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), 0.0);
// Get color for a slice from a gradient linearly, beginning from the start of the gradient
qreal pos = (qreal) (i + 1) / (qreal) series->count();
QColor brushColor = colorAt(m_seriesGradients.at(index % m_seriesGradients.size()), pos);
QPieSlice::DataPtr s = series->slices().at(i)->data_ptr();
PieSliceData data = s->m_data;
if (data.m_slicePen.isThemed() || force) {
data.m_slicePen = penColor;
data.m_slicePen.setThemed(true);
}
if (data.m_sliceBrush.isThemed() || force) {
data.m_sliceBrush = brushColor;
data.m_sliceBrush.setThemed(true);
}
if (data.m_labelPen.isThemed() || force) {
data.m_labelPen = QPen(m_titleBrush.color());
data.m_labelPen.setThemed(true);
}
if (data.m_labelFont.isThemed() || force) {
data.m_labelFont = m_labelFont;
data.m_labelFont.setThemed(true);
}
if (s->m_data != data) {
s->m_data = data;
emit s->changed();
}
}
}
void ChartTheme::decorate(QSplineSeries* series, int index, bool force)
{
QPen pen;
if(pen == series->pen() || force){
pen.setColor(m_seriesColors.at(index%m_seriesColors.size()));
pen.setWidthF(2);
series->setPen(pen);
}
}
void ChartTheme::decorate(QChartAxis* axis,bool axisX, bool force)
{
QPen pen;
QBrush brush;
QFont font;
if (axis->isAxisVisible()) {
if(brush == axis->labelsBrush() || force){
axis->setLabelsBrush(m_axisLabelBrush);
}
if(pen == axis->labelsPen() || force){
axis->setLabelsPen(Qt::NoPen); // NoPen for performance reasons
}
if (axis->shadesVisible() || force) {
if(brush == axis->shadesBrush() || force){
axis->setShadesBrush(m_backgroundShadesBrush);
}
if(pen == axis->shadesPen() || force){
axis->setShadesPen(m_backgroundShadesPen);
}
if(force && (m_backgroundShades == BackgroundShadesBoth
|| (m_backgroundShades == BackgroundShadesVertical && axisX)
|| (m_backgroundShades == BackgroundShadesHorizontal && !axisX))){
axis->setShadesVisible(true);
}
}
if(pen == axis->axisPen() || force){
axis->setAxisPen(m_axisLinePen);
}
if(pen == axis->gridLinePen() || force){
axis->setGridLinePen(m_gridLinePen);
}
if(font == axis->labelsFont() || force){
axis->setLabelsFont(m_labelFont);
}
}
}
void ChartTheme::generateSeriesGradients()
{
// Generate gradients in HSV color space
foreach (QColor color, m_seriesColors) {
QLinearGradient g;
qreal h = color.hsvHueF();
qreal s = color.hsvSaturationF();
// TODO: tune the algorithm to give nice results with most base colors defined in
// most themes. The rest of the gradients we can define manually in theme specific
// implementation.
QColor start = color;
start.setHsvF(h, 0.0, 1.0);
g.setColorAt(0.0, start);
g.setColorAt(0.5, color);
QColor end = color;
end.setHsvF(h, s, 0.25);
g.setColorAt(1.0, end);
m_seriesGradients << g;
}
}
QColor ChartTheme::colorAt(const QColor &start, const QColor &end, qreal pos)
{
Q_ASSERT(pos >=0.0 && pos <= 1.0);
qreal r = start.redF() + ((end.redF() - start.redF()) * pos);
qreal g = start.greenF() + ((end.greenF() - start.greenF()) * pos);
qreal b = start.blueF() + ((end.blueF() - start.blueF()) * pos);
QColor c;
c.setRgbF(r, g, b);
return c;
}
QColor ChartTheme::colorAt(const QGradient &gradient, qreal pos)
{
Q_ASSERT(pos >=0 && pos <= 1.0);
// another possibility:
// http://stackoverflow.com/questions/3306786/get-intermediate-color-from-a-gradient
QGradientStops stops = gradient.stops();
int count = stops.count();
// find previous stop relative to position
QGradientStop prev = stops.first();
for (int i=0; i<count; i++) {
QGradientStop stop = stops.at(i);
if (pos > stop.first)
prev = stop;
// given position is actually a stop position?
if (pos == stop.first) {
//qDebug() << "stop color" << pos;
return stop.second;
}
}
// find next stop relative to position
QGradientStop next = stops.last();
for (int i=count-1; i>=0; i--) {
QGradientStop stop = stops.at(i);
if (pos < stop.first)
next = stop;
}
//qDebug() << "prev" << prev.first << "pos" << pos << "next" << next.first;
qreal range = next.first - prev.first;
qreal posDelta = pos - prev.first;
qreal relativePos = posDelta / range;
//qDebug() << "range" << range << "posDelta" << posDelta << "relativePos" << relativePos;
return colorAt(prev.second, next.second, relativePos);
}
QTCOMMERCIALCHART_END_NAMESPACE