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Madplotlib.h
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/* Copyright (C) 2017 Karl Phillip Buhr <[email protected]>
*
* This work is licensed under the MIT License.
* To view a copy of this license, visit:
* https://opensource.org/licenses/MIT
*
* This file is part of Madplotlib, a C++ library for building simple
* 2D plots inspired on matplotlib.
*/
#pragma once
#include <memory>
#ifndef NO_EIGEN
#include <Eigen/Dense>
#endif
#include <QDebug>
#include <QEventLoop>
#include <QGraphicsLayout>
#include <QPair>
#include <QtCharts/QCategoryAxis>
#include <QtCharts/QChart>
#include <QtCharts/QChartView>
#include <QtCharts/QLineSeries>
#include <QtCharts/QScatterSeries>
#include <QtCharts/QValueAxis>
#pragma once
#ifndef PLT_ARG_NAMESPACE
#define PLT_ARG_NAMESPACE
#endif
#ifdef _MSC_VER
#if _MSC_VER >= 1900
#define PLT_CONSTEXPR constexpr
#else
#define PLT_CONSTEXPR
#endif
#else
#define PLT_CONSTEXPR constexpr
#endif
#define MO_KEYWORD_INPUT(name, type) \
namespace tag { \
struct name { \
typedef type Type; \
typedef const Type &ConstRef; \
typedef Type &Ref; \
typedef ConstRef StorageType; \
typedef const void *VoidType; \
template <typename T> static PLT_CONSTEXPR bool AllowedType() { \
return std::is_same<Type, T>::value; \
} \
static VoidType GetPtr(const Type &arg) { return &arg; } \
template <class T> static VoidType GetPtr(const T &arg) { \
(void)arg; \
return nullptr; \
} \
}; \
} \
namespace PLT_ARG_NAMESPACE { \
static kwargs::TKeyword<tag::name> &name = \
kwargs::TKeyword<tag::name>::instance; \
}
#define MO_KEYWORD_OUTPUT(name, type) \
namespace tag { \
struct name { \
typedef type Type; \
typedef const Type &ConstRef; \
typedef Type &Ref; \
typedef Ref StorageType; \
typedef void *VoidType; \
template <typename T> static PLT_CONSTEXPR bool AllowedType() { \
return std::is_same<Type, T>::value; \
} \
static VoidType GetPtr(Type &arg) { return &arg; } \
template <class T> static VoidType GetPtr(const T &arg) { \
(void)arg; \
return nullptr; \
} \
}; \
} \
namespace PLT_ARG_NAMESPACE { \
static kwargs::TKeyword<name> &name = kwargs::TKeyword<name>::instance; \
}
namespace kwargs {
struct TaggedBase {};
template <class Tag> struct TaggedArgument : public TaggedBase {
typedef Tag TagType;
explicit TaggedArgument(typename Tag::StorageType val) : arg(&val) {}
typename Tag::VoidType get() const { return arg; }
protected:
typename Tag::VoidType arg;
};
template <class Tag> struct TKeyword {
static TKeyword instance;
TaggedArgument<Tag> operator=(typename Tag::StorageType data) {
return TaggedArgument<Tag>(data);
}
};
template <class T> TKeyword<T> TKeyword<T>::instance;
} // namespace kwargs
template <int N, typename... T> struct ArgType;
template <typename T0, typename... T> struct ArgType<0, T0, T...> {
typedef T0 type;
};
template <int N, typename T0, typename... T> struct ArgType<N, T0, T...> {
typedef typename ArgType<N - 1, T...>::type type;
};
template <class Tag, bool Infer = false> typename Tag::VoidType GetKeyImpl() {
return 0;
}
template <class T, class U> PLT_CONSTEXPR int CountTypeImpl(const U &value) {
return std::is_same<T, U>::value ? 1 : 0;
}
template <class T, class U, class... Args>
PLT_CONSTEXPR int CountTypeImpl(const U &value, const Args &...args) {
return CountTypeImpl<T, Args...>(args...) +
(std::is_same<T, U>::value ? 1 : 0);
}
template <class T, class... Args>
PLT_CONSTEXPR int CountType(const Args &...args) {
return CountTypeImpl<T, Args...>(args...);
}
template <size_t N, typename... Args>
auto GetPositionalInput(Args &&...as)
-> decltype(std::get<N>(std::forward_as_tuple(std::forward<Args>(as)...))) {
return std::get<N>(std::forward_as_tuple(std::forward<Args>(as)...));
}
template <class Tag, bool Infer = false, class T, class... Args>
typename std::enable_if<std::is_base_of<kwargs::TaggedBase, T>::value,
typename Tag::VoidType>::type
GetKeyImpl(const T &arg, const Args &...args) {
return std::is_same<typename T::TagType, Tag>::value
? const_cast<void *>(arg.get())
: const_cast<void *>(GetKeyImpl<Tag, Infer, Args...>(args...));
}
template <class Tag, bool Infer = false, class T, class... Args>
typename std::enable_if<!std::is_base_of<kwargs::TaggedBase, T>::value,
typename Tag::VoidType>::type
GetKeyImpl(const T &arg, const Args &...args) {
#ifdef __GNUC__
// static_assert(CountType<typename Tag::Type>(arg, args...) <= 1, "Cannot
// infer type when there are multiple variadic Params with desired type");
#endif
return Tag::template AllowedType<T>() && Infer
? // This infers the type
Tag::GetPtr(arg)
: const_cast<void *>(GetKeyImpl<Tag, Infer, Args...>(args...));
}
template <class Tag, bool Infer = false, class... Args>
typename Tag::ConstRef GetKeywordInput(const Args &...args) {
const void *ptr = GetKeyImpl<Tag, Infer>(args...);
assert(ptr);
return *(static_cast<const typename Tag::Type *>(ptr));
}
template <class Tag, bool Infer = false, class... Args>
typename Tag::ConstRef GetKeywordInputDefault(typename Tag::ConstRef def,
const Args &...args) {
const void *ptr = GetKeyImpl<Tag, Infer>(args...);
if (ptr)
return *static_cast<const typename Tag::Type *>(ptr);
return def;
}
template <class Tag, bool Infer = false, class... Args>
const typename Tag::Type *GetKeywordInputOptional(const Args &...args) {
const void *ptr = GetKeyImpl<Tag, Infer>(args...);
if (ptr)
return static_cast<const typename Tag::Type *>(ptr);
return nullptr;
}
template <class Tag, bool Infer = false, class... Args>
typename Tag::Ref GetKeywordOutput(const Args &...args) {
static_assert(!std::is_const<typename Tag::VoidType>::value,
"Tag type is not an output tag");
void *ptr = GetKeyImpl<Tag, Infer>(args...);
assert(ptr);
return *(static_cast<typename Tag::Type *>(ptr));
}
template <class Tag, bool Infer = false, class... Args>
typename Tag::Type *GetKeywordOutputOptional(const Args &...args) {
static_assert(!std::is_const<typename Tag::VoidType>::value,
"Tag type is not an output tag");
void *ptr = GetKeyImpl<Tag, Infer>(args...);
if (ptr)
return (static_cast<typename Tag::Type *>(ptr));
return nullptr;
}
MO_KEYWORD_INPUT(x, Eigen::ArrayXf)
MO_KEYWORD_INPUT(y, Eigen::ArrayXf)
MO_KEYWORD_INPUT(marker, QString)
MO_KEYWORD_INPUT(label, QString)
MO_KEYWORD_INPUT(color, QColor)
MO_KEYWORD_INPUT(linewidth, quint32)
MO_KEYWORD_INPUT(alpha, qreal)
MO_KEYWORD_INPUT(edgecolor, QColor)
MO_KEYWORD_INPUT(markersize, qreal)
// The below works on MSVC 2015
/*template<typename T, typename Enable = void>
struct is_matrix_expression : std::false_type {};
template<typename T>
struct is_matrix_expression<T, decltype(std::declval<Eigen::ArrayXf>() =
std::declval<T>(), void())> : std::true_type {};*/
// Not sure if there are limitations to this but it seems to work on 2013
template <typename Derived>
struct is_matrix_expression
: std::is_base_of<Eigen::ArrayBase<std::decay<Derived>>,
std::decay<Derived>> {};
/* Debug control */
#define DEBUG \
0 // level 0: debug msgs are disabled
// level 1: print method calls
// level 2: print method calls + data
/* Global definitions */
#define SHOW_TICK 1
#define HIDE_TICK 2
#define SHOW_CUSTOM_TICK 4
#define DEFAULT_LEGEND ""
#define DEFAULT_MARKER "-"
#define DEFAULT_ALPHA 1.0f
#define DEFAULT_COLOR "none"
#define DEFAULT_EDGECOLOR "none"
#define DEFAULT_LINEW 2
#define DEFAULT_MARKERSZ 6.0f
#ifdef NO_EIGEN
#error COMPILATION MUST GO THOUGH WITHOUT EIGEN CODE.
#endif
class Madplotlib {
public:
Madplotlib(bool isWidget = false)
: _chart(NULL), _chartView(NULL), _isWidget(isWidget) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "Madplotlib(): isWidget=" << isWidget;
#endif
_xAxisTop = _xAxisBottom = _yAxisLeft = _yAxisRight = nullptr;
_chart = new QtCharts::QChart();
_chartView = new QtCharts::QChartView(_chart);
_enableGrid = false;
_customLimits = false;
_xMin = _xMax = _yMin = _yMax = 0;
_showXticks = _showYticks = SHOW_TICK;
_xTickCount = 7;
_yTickCount = 5;
_colorIdx = 0;
_colors.push_back(QColor(0x1f77b4));
_colors.push_back(QColor(0xff7f0e));
_colors.push_back(QColor(0x2ca02c));
_colors.push_back(QColor(0xd62728));
_colors.push_back(QColor(0x9467bd));
_colors.push_back(QColor(0x8c564b));
_colors.push_back(QColor(0xe377c2));
_colors.push_back(QColor(0x7f7f7f));
_colors.push_back(QColor(0xbcbd22));
_colors.push_back(QColor(0x17becf));
}
void axis(QString cmd) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "axis(): cmd=" << cmd;
#endif
if (cmd == "off") {
_showYticks = _showXticks = HIDE_TICK;
} else if (cmd == "xoff") {
_showXticks = HIDE_TICK;
} else if (cmd == "yoff") {
_showYticks = HIDE_TICK;
} else {
qCritical() << "axis()!!! options are 'off', 'xoff' and 'yoff'.";
return;
}
}
/* axis(): gets the current axes limits [xMin, xMax, yMin, yMax].
*/
void axis(qreal *xMin, qreal *xMax, qreal *yMin, qreal *yMax) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "axis(): _xMin=" << _xMin << " _xMax=" << _xMax
<< " _yMin=" << _yMin << " _yMax=" << _yMax;
#endif
*xMin = _xMin;
*xMax = _xMax;
*yMin = _yMin;
*yMax = _yMax;
}
/* axis(): sets the viewport of the axis by a list of [xMin, xMax, yMin,
* yMax].
*/
void axis(const qreal &xMin, qreal xMax, const qreal &yMin,
const qreal &yMax) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "axis(): xMin=" << xMin << " xMax=" << xMax << " yMin=" << yMin
<< " yMax=" << yMax;
#endif
_xMin = xMin;
_xMax = xMax;
_yMin = yMin;
_yMax = yMax;
_customLimits = true;
}
/* xlim(): sets the x limits of the current axes.
*/
void xlim(const qreal &xMin, const qreal &xMax) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "xlim(): xMin=" << xMin << " xMax=" << xMax;
#endif
_xMin = xMin;
_xMax = xMax;
_customLimits = true;
}
/* ylim(): sets the x limits of the current axes.
*/
void ylim(const qreal &yMin, const qreal &yMax) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "ylim(): yMin=" << yMin << " yMax=" << yMax;
#endif
_yMin = yMin;
_yMax = yMax;
_customLimits = true;
}
/* title(): defines the title of the chart.
*/
void title(QString string) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "title(): string=" << string;
#endif
_title = string;
}
/* xlabel(): defines the label displayed below the x axis.
*/
void xlabel(QString label) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "xlabel(): label=" << label;
#endif
_xLabel = label;
}
/* ylabel(): defines the label displayed to the left of the y axis.
*/
void ylabel(QString label) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "ylabel(): label=" << label;
#endif
_yLabel = label;
}
/* legend(): defines the position of the legend label inside the chart.
*/
void legend() { _legendPos = "lower center"; }
/* legend(): defines the position of the legend label inside the chart.
*/
void legend(QString cmd) { _legendPos = _parseLegendPos(cmd); }
/* grid(): enables or disables the background grid of the chart.
*/
void grid(bool status) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "grid(): status=" << status;
#endif
_enableGrid = status;
}
/* savefig(): saves the chart displayed by show() as an image on the disk.
*/
void savefig(QString filename) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "savefig(): filename=" << filename;
#endif
if (!_pixmap.isNull())
_pixmap.save(filename);
else if (_isWidget && _chartView) {
_pixmap = _chartView->grab();
}
}
/* xticks(): sets the x-limits of the current tick locations and labels.
*/
void xticks(const Eigen::ArrayXf &values, const QVector<QString> &labels) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "xticks(): values.sz=" << values.rows()
<< " labels.sz=" << labels.size();
#endif
if (values.rows() == 0 && labels.size() == 0) {
_showXticks = HIDE_TICK;
return;
}
if (values.rows() != labels.size()) {
qCritical() << "xticks(): the amount of values and labels must match!";
return;
}
for (int i = 0; i < values.rows(); i++)
_xTicks.push_back(QPair<QString, qreal>(labels[i], values[i]));
_showXticks = SHOW_CUSTOM_TICK;
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "xticks(): xticks.sz=" << _xTicks.size();
for (int i = 0; i < _xTicks.size(); i++)
qDebug() << "\t" << _xTicks[i].second << " = " << _xTicks[i].first;
#endif
}
/* yticks(): sets the y-limits of the current tick locations and labels.
*/
void yticks(const Eigen::ArrayXf &values, const QVector<QString> &labels) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "yticks(): values.sz=" << values.rows()
<< " labels.sz=" << labels.size();
#endif
if (values.rows() == 0 && labels.size() == 0) {
_showYticks = HIDE_TICK;
return;
}
if (values.rows() != labels.size()) {
qCritical()
<< "PlotLib::xticks(): the amount of values and labels must match!";
return;
}
for (int i = 0; i < values.rows(); i++)
_yTicks.push_back(QPair<QString, qreal>(labels[i], values[i]));
_showYticks = SHOW_CUSTOM_TICK;
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "yticks(): yticks.sz=" << _yTicks.size();
for (int i = 0; i < _yTicks.size(); i++)
qDebug() << "\t" << _yTicks[i].second << " = " << _yTicks[i].first;
#endif
}
/* locator_params(): reduce or increase the amount of ticks for each axis.
*/
void locator_params(QString axis, int nbins) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "locator_params(): axis=" << axis << " nbins=" << nbins;
#endif
if (axis == "x") {
_xTickCount = nbins;
} else if (axis == "y") {
_yTickCount = nbins;
} else if (axis == "both") {
_yTickCount = _xTickCount = nbins;
} else {
qCritical() << "locator_params(): '" << axis
<< "' is not a valid option.";
return;
}
}
template <class T, class... Args>
typename std::enable_if<!is_matrix_expression<T>::value>::type
plot(const Eigen::ArrayXf &y, const T &arg1, const Args &...args) {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "plot(y): marker=" << marker << " alpha=" << alpha
<< " color=" << color << " edgecolor=" << edgecolor
<< " linewidth=" << linewidth << " markersize=" << markersize;
#endif
if (y.rows() == 0) {
qCritical() << "plot(y): axis size must be > 0 but its " << y.rows();
exit(-1);
}
// number of x values needed to accompany the y values
int num_items = y.rows();
// make up X data and plot into series, but take into account that xlim()
// could have been called with the start and end of x series.
Eigen::ArrayXf x = Eigen::ArrayXf(y.rows());
qreal x_inc = 1;
if (_customLimits && (_xMin != _xMax)) {
qreal xrange = _xMax - _xMin;
x_inc = xrange / y.rows();
}
qreal x_value = _xMin;
for (int i = 0; i < num_items; i++) {
x[i] = x_value;
x_value += x_inc;
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "plot(y): generated x[" << i << "]=" << x[i];
#endif
}
plotXY(x, y, arg1, args...);
}
/* plot(): called when user needs to put data on a chart.
* x: an array that stores x axis values.
* y: an array that stores y axis values.
* marker: chart types. "-" for line plot and "o" for scatter plot.
* alpha: defines the transparency level of the color.
* color: defines the color used to draw the data.
* edgecolor: defines the edge color of "o" marker.
* linewidth: defines the width of the pen used to draw "-" marker.
* markersize: defines the size of "o" marker.
*/
template <class T, class... Args>
typename std::enable_if<is_matrix_expression<T>::value>::type
plot(const Eigen::ArrayXf &x, const T &y, const Args &...args) {
plotXY(x, y, args...);
}
template <class... Args>
void plotXY(const Eigen::ArrayXf &x, const Eigen::ArrayXf &y,
const Args &...args) {
const QString marker =
GetKeywordInputDefault<tag::marker>(DEFAULT_MARKER, args...);
const QString label =
GetKeywordInputDefault<tag::label>(DEFAULT_LEGEND, args...);
const qreal &alpha =
GetKeywordInputDefault<tag::alpha>(DEFAULT_ALPHA, args...);
const QColor color =
GetKeywordInputDefault<tag::color>(DEFAULT_COLOR, args...);
const quint32 &linewidth =
GetKeywordInputDefault<tag::linewidth>(DEFAULT_LINEW, args...);
const QColor edgecolor =
GetKeywordInputDefault<tag::edgecolor>(DEFAULT_EDGECOLOR, args...);
const qreal &markersize =
GetKeywordInputDefault<tag::markersize>(DEFAULT_MARKERSZ, args...);
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "plot(x,y): marker:" << marker << " alpha:" << alpha
<< " color:" << color << " edgecolor:" << edgecolor
<< " linewidth:" << linewidth << " markersize:" << markersize;
#endif
if (marker != "-" && marker != "--" && marker != "." && marker != "o" &&
marker != "s") {
qCritical() << "plot(x,y): unknown marker '" << marker << "'.";
return;
}
if (x.rows() != y.rows()) {
qCritical() << "plot(x,y): x.sz=" << x.cols() << " != y.sz=" << y.rows();
exit(-1);
}
if (x.rows() == 0 || y.rows() == 0) {
qCritical() << "plot(x,y): axis size must be > 0 but it is x.sz="
<< x.rows() << " y.sz=" << y.rows();
exit(-1);
}
// Make a copy because it's show() who setup these things
_legend = label;
// find min and max values to define the range of the X axis
qreal xMin = x.minCoeff();
qreal xMax = x.maxCoeff();
if (xMin < _xMin)
_xMin = xMin;
if (xMax > _xMax)
_xMax = xMax;
// find min and max values to stablish the range of the Y axis
// however, if a new series brings more xtreme values, we need to respect
// that!
qreal yMin = y.minCoeff();
qreal yMax = y.maxCoeff();
if (yMin < _yMin)
_yMin = yMin;
if (yMax > _yMax)
_yMax = yMax;
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "plot(x,y): xrange [" << _xMin << "," << _xMax << "] yrange ["
<< _yMin << "," << _yMax << "]";
#endif
std::shared_ptr<QtCharts::QXYSeries> series;
auto itr = _seriesVec.find(_legend);
if (itr != _seriesVec.end()) {
series = *itr;
} else {
if (marker == "o" || marker == "s") // it's a scatter plot!
{
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "plot(x,y): scatter plot";
#endif
QtCharts::QScatterSeries *s = new QtCharts::QScatterSeries();
s->setMarkerSize(markersize); // symbol size
if (marker == "o")
s->setMarkerShape(QtCharts::QScatterSeries::MarkerShapeCircle);
if (marker == "s")
s->setMarkerShape(QtCharts::QScatterSeries::MarkerShapeRectangle);
series.reset((QtCharts::QXYSeries *)s);
series->setUseOpenGL(true);
} else // draw line
{
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "plot(x,y): line plot";
#endif
series.reset(new QtCharts::QLineSeries());
series->setUseOpenGL(true);
}
}
// Call a string parser! Ex: "label=Trump Tweets" becomes "Trump Tweets"
_parseLegend();
if (_legend.size()) {
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "plot(x,y): label=" << _legend;
#endif
series->setName(_legend);
}
if (series->count() == x.rows()) {
for (int i = 0; i < x.rows(); i++)
series->replace(i, x[i], y[i]);
} else {
series->clear();
for (int i = 0; i < x.rows(); i++) {
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "plot(x,y): x[" << i << "]=" << x[i] << " y[" << i
<< "]=" << y[i];
#endif
series->append(x[i], y[i]);
}
}
// Customize series color and transparency
QColor fillColor = color;
if (fillColor == DEFAULT_COLOR)
fillColor = _colors[_colorIdx++];
fillColor.setAlphaF(alpha);
QPen pen = series->pen();
pen.setWidth(linewidth);
if (marker == "o" || marker == "s") {
if (edgecolor == DEFAULT_EDGECOLOR) {
pen.setColor(fillColor); // outline should be invisible
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "plot(x,y): fillColor=" << fillColor;
#endif
} else {
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "plot(x,y): edgecolor=" << edgecolor;
#endif
QColor edgeColor = edgecolor;
edgeColor.setAlphaF(alpha);
pen.setColor(edgeColor); // create circle outline
}
} else if (marker == "--") {
pen.setStyle(Qt::DashLine);
pen.setColor(fillColor);
} else if (marker == ".") {
pen.setStyle(Qt::DotLine);
pen.setColor(fillColor);
} else // marker == "-"
{
pen.setColor(fillColor);
}
series->setPen(pen);
series->setBrush(QBrush(fillColor));
if (_colorIdx >= _colors.size())
_colorIdx = 0;
//_seriesVec.push_back(series);
_seriesVec[_legend] = series;
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "plot(x,y): -----";
#endif
}
/* show(): displays all the data added through plot() calls.
*/
void show() {
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "show(): " << _title;
#endif
if (!_seriesVec.size()) {
qCritical() << "show()!!! Must set the data with plot() before show().";
return;
}
/* Customize chart title */
QFont font;
font.setPixelSize(12);
font.setWeight(QFont::Bold);
_chart->setTitleFont(font);
_chart->setTitle(_title);
// TODO: investigate detaching the legend for custom positioning
// https://doc.qt.io/qt-5/qtcharts-legend-example.html
if (_legendPos.size()) {
if (_legendPos == "lower center") // 9
_chart->legend()->setAlignment(Qt::AlignBottom);
else if (_legendPos == "upper center") // 8
_chart->legend()->setAlignment(Qt::AlignTop);
else if (_legendPos == "center right") // 7
_chart->legend()->setAlignment(Qt::AlignRight);
else if (_legendPos == "center left") // 6
_chart->legend()->setAlignment(Qt::AlignLeft);
else {
qCritical() << "show()!!!" << _legendPos
<< " is not a valid legend position.";
_chart->legend()->setAlignment(Qt::AlignBottom);
}
}
if (_legend.size())
_chart->legend()->setVisible(true);
else
_chart->legend()->setVisible(false);
/* Customize X, Y axis and categories */
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "show(): xrange [" << _xMin << "," << _xMax << "] "
<< " yrange [" << _yMin << "," << _yMax << "]";
#endif
QPen axisPen(Qt::black); // default axis line color and width
axisPen.setWidth(1);
QtCharts::QValueAxis *axisX = NULL;
QtCharts::QCategoryAxis *categoryX = NULL;
if (_showXticks == SHOW_TICK || _showXticks == HIDE_TICK) {
bool add = true;
if (_xAxisBottom) {
axisX = dynamic_cast<QtCharts::QValueAxis *>(_xAxisBottom);
add = false;
} else {
axisX = new QtCharts::QValueAxis;
}
axisX->setGridLineVisible(_enableGrid);
axisX->setTitleText(_xLabel);
axisX->setLinePen(axisPen);
axisX->setRange(_xMin, _xMax);
axisX->setTickCount(_xTickCount);
if (!_customLimits)
axisX->applyNiceNumbers();
if (add)
_chart->addAxis(axisX, Qt::AlignBottom);
_xAxisBottom = axisX;
if (_showXticks == HIDE_TICK)
axisX->setLabelsVisible(false);
} else if (_showXticks == SHOW_CUSTOM_TICK) {
categoryX = new QtCharts::QCategoryAxis();
categoryX->setGridLineVisible(_enableGrid);
categoryX->setLinePen(axisPen);
if (_showXticks && _xTicks.size())
for (int i = 0; i < _xTicks.size(); i++) {
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "show(): xtick[" << i << "]=(" << _xTicks[i].second
<< " , " << _xTicks[i].first << ")";
#endif
categoryX->append(_xTicks[i].first, _xTicks[i].second);
}
categoryX->setRange(_xMin, _xMax);
categoryX->setTickCount(_xTicks.size());
if (_xAxisBottom)
_chart->removeAxis(_xAxisBottom);
_chart->addAxis(categoryX, Qt::AlignBottom);
_xAxisBottom = categoryX;
}
QtCharts::QValueAxis *axisY = NULL;
QtCharts::QCategoryAxis *categoryY = NULL;
if (_showYticks == SHOW_TICK ||
_showYticks == HIDE_TICK) // this is the default ticks setup
{
bool add = true;
if (_yAxisLeft) {
axisY = dynamic_cast<QtCharts::QValueAxis *>(_yAxisLeft);
add = false;
} else {
axisY = new QtCharts::QValueAxis;
}
axisY->setGridLineVisible(_enableGrid);
axisY->setTitleText(_yLabel);
axisY->setLinePen(axisPen);
axisY->setRange(_yMin, _yMax);
axisY->setTickCount(_yTickCount);
if (!_customLimits)
axisY->applyNiceNumbers();
if (add)
_chart->addAxis(axisY, Qt::AlignLeft);
_yAxisLeft = axisY;
if (_showYticks == HIDE_TICK)
axisY->setLabelsVisible(false);
} else if (_showYticks ==
SHOW_CUSTOM_TICK) // this is for user defined ticks
{
categoryY = new QtCharts::QCategoryAxis();
categoryY->setGridLineVisible(_enableGrid);
categoryY->setLinePen(axisPen);
if (_showYticks && _yTicks.size() > 0)
for (int i = 0; i < _yTicks.size(); i++) {
#if (DEBUG > 1) && (DEBUG < 3)
qDebug() << "show(): ytick[" << i << "]=(" << _yTicks[i].second
<< " , " << _yTicks[i].first << ")";
#endif
categoryY->append(_yTicks[i].first, _yTicks[i].second);
}
categoryY->setRange(_yMin, _yMax);
categoryY->setTickCount(_yTicks.size());
if (_yAxisLeft)
_chart->removeAxis(_yAxisLeft);
_chart->addAxis(categoryY, Qt::AlignLeft);
_yAxisLeft = categoryY;
}
/* Other possible customizations such as margins and background color */
// Remove (fat) exterior margins from QChart
_chart->layout()->setContentsMargins(0, 0, 0, 0);
_chart->setBackgroundRoundness(0);
/* Add series of data */
_chart->removeAllSeries();
for (auto itr : _seriesVec) {
_chart->addSeries(itr.get());
if (_showXticks == SHOW_TICK || _showXticks == HIDE_TICK) {
itr->attachAxis(axisX);
} else if (_showXticks == SHOW_CUSTOM_TICK) {
itr->attachAxis(categoryX);
}
if (_showYticks == SHOW_TICK || _showYticks == HIDE_TICK) {
itr->attachAxis(axisY);
} else if (_showYticks == SHOW_CUSTOM_TICK) {
itr->attachAxis(categoryY);
}
}
_chartView->setRenderHint(QPainter::Antialiasing);
_chartView->resize(600, 400);
// Take a screenshot of the widget before it's destroyed
// so it can be saved later, when savefig() is invoked after show().
_chartView->show();
// This loop blocks execution & waits for the window to be destroyed.
// However, is this chart is supposed to be a real widget, then do none of
// this.
if (!_isWidget) {
_pixmap = _chartView->grab();
_chartView->setAttribute(
Qt::WA_DeleteOnClose); // This deletes _chartView!
QEventLoop loop;
QObject::connect(_chartView, SIGNAL(destroyed()), &loop, SLOT(quit()));
loop.exec();
// _chartView was automatically deleted. Release all the other resources!
//_seriesVec.clear();
}
#if (DEBUG > 0) && (DEBUG < 2)
qDebug() << "show(): -----";
#endif
}
void clear() { _seriesVec.clear(); }
private:
bool _is_marker(const QString &cmd) {
if (cmd == "-" || cmd == "--" || cmd == "." || cmd == "o" || cmd == "s")
return true;
return false; // cmd is a label for the legend
}
void _check_cmds_are_good(const QString &cmd1, const QString &cmd2) {
if (_is_marker(cmd1) && !_is_marker(cmd2))
return;
if (!_is_marker(cmd1) && _is_marker(cmd2))
return;
qCritical() << "_check_cmds_are_good()!!! Only one marker and one label "
"are allowed.";
exit(-1);
}
void _parseLegend() {
if (!_legend.size())
return;
QRegExp equalsRegex("(\\=)"); // RegEx for '='
QStringList wordList = _legend.split(equalsRegex);
// step1: trim spaces
for (int i = 0; i < wordList.size(); i++)
wordList[i] = wordList[i].trimmed();
// step 2: delete empty strings
QMutableStringListIterator it(wordList); // pass list as argument
while (it.hasNext()) {
if (!it.next().size())
it.remove();
}
int i = -1;
QStringList::iterator iter =
std::find(wordList.begin(), wordList.end(), "label");
if (iter != wordList.end())
i = iter - wordList.begin(); // if "loc" is in the list, i has the index
// ok, "label" exists && there's another word after it on the list
if (i >= 0 && i + 1 < wordList.size())
_legend = wordList[i + 1];
else
_legend.clear();
}
QString _parseLegendPos(QString cmd) {
if (!cmd.size())
return QString();
QRegExp equalsRegex("(\\=)"); // RegEx for '='
QStringList wordList = cmd.split(equalsRegex);
// step1: trim spaces
for (int i = 0; i < wordList.size(); i++)
wordList[i] = wordList[i].trimmed();
// step 2: delete empty strings
QMutableStringListIterator it(wordList); // pass list as argument
while (it.hasNext()) {
if (!it.next().size())
it.remove();
}
int i = -1;
QStringList::iterator iter =
std::find(wordList.begin(), wordList.end(), "loc");
if (iter != wordList.end())
i = iter - wordList.begin(); // if "loc" is in the list, i has the index
// ok, "label" exists && there's another word after it on the list
if (i >= 0 && i + 1 < wordList.size())
return wordList[i + 1];
return QString();
}
QPixmap
_pixmap; // show() screenshots the widget, savefig() writes it on the disk
QtCharts::QChart *_chart; // manages the graphical representation of the