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#include <private/colormapchart_p.h>
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#include <QtCharts/QColorMapSeries>
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#include <private/qcolormapseries_p.h>
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#include <private/chartpresenter_p.h>
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#include <private/abstractdomain_p.h>
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#include <private/chartdataset_p.h>
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#include <private/qabstractaxis_p.h>
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#include <QtGui/QPainter>
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#include <QRgb>
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#define nbOfColors 65000
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QT_CHARTS_BEGIN_NAMESPACE
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ColorMapChart::ColorMapChart(QColorMapSeries *series, QGraphicsItem *item)
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: ChartItem(series->d_func(), item),
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m_series(series),
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m_dirty(true),
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m_gradientType(Rainbow),
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m_colorbar(Q_NULLPTR),
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m_isColorBarDrawn(false),
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m_currentplotArea(QRectF()),
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m_grid(Q_NULLPTR)
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{
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// QObject::connect(series, SIGNAL(pointReplaced(int)), this, SLOT(handlePointReplaced(int)));
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// QObject::connect(series, SIGNAL(pointsReplaced()), this, SLOT(handlePointsReplaced()));
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// QObject::connect(series, SIGNAL(pointAdded(int)), this, SLOT(handlePointAdded(int)));
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// QObject::connect(series, SIGNAL(pointRemoved(int)), this, SLOT(handlePointRemoved(int)));
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// QObject::connect(series, SIGNAL(pointsRemoved(int, int)), this, SLOT(handlePointsRemoved(int, int)));
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// QObject::connect(this, SIGNAL(clicked(Point3D)), series, SIGNAL(clicked(Point3D)));
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// QObject::connect(this, SIGNAL(hovered(Point3D,bool)), series, SIGNAL(hovered(Point3D,bool)));
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// QObject::connect(this, SIGNAL(pressed(Point3D)), series, SIGNAL(pressed(Point3D)));
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// QObject::connect(this, SIGNAL(released(Point3D)), series, SIGNAL(released(Point3D)));
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// QObject::connect(this, SIGNAL(doubleClicked(Point3D)), series, SIGNAL(doubleClicked(Point3D)));
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connect(this,SIGNAL(gradientTypeChanged()), this, SLOT(populateColorTable()));
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m_colorTable = new QVector<QRgb>();
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m_colorTable->reserve(nbOfColors);
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populateColorTable();
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}
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ColorMapChart::~ColorMapChart()
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{
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delete m_colorTable;
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delete m_colorbar;
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}
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void ColorMapChart::setDirty(bool dirty)
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{
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m_dirty = dirty;
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}
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QRectF ColorMapChart::boundingRect() const
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{
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return m_rect;
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}
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void ColorMapChart::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
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{
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Q_UNUSED(widget)
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Q_UNUSED(option)
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m_series->setUseOpenGL();
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painter->save();
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QRectF clipRect = QRectF(QPointF(0, 0), domain()->size());
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painter->setClipRect(clipRect);
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QRectF plotAreaRect = m_series->chart()->plotArea();
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if(m_currentplotArea !=plotAreaRect)
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{
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m_currentplotArea = plotAreaRect;
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m_grid = m_series->getUniformGrid(0,0,plotAreaRect.width(),plotAreaRect.height(),QColorMapSeries::LastPixel);
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addColorBar(plotAreaRect);
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}
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QImage colorMapImage(plotAreaRect.width(),plotAreaRect.height(),QImage::Format_RGB32);
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//http://doc.qt.io/qt-4.8/qimage.html#details :Warning: This will create a QImage with uninitialized data. Call fill() to fill the image with an appropriate pixel value before drawing onto it with QPainter.
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colorMapImage.fill(QColor(Qt::white).rgb());
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double maxZ = m_series->maxZ();
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double minZ = m_series->minZ();
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double rangeZ = maxZ - minZ;
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int imageWidth = colorMapImage.width();
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int imageHeight = colorMapImage.height();
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for(int i=0;i<imageWidth;i++)
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{
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for(int j=0;j<imageHeight;j++)
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{
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double value = m_grid->at(i+j*(imageWidth));
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double pix=((value-minZ)/rangeZ);
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int indexInColorTable = pix*(nbOfColors-1);
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colorMapImage.setPixel(i,j,m_colorTable->at(indexInColorTable));
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}
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}
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painter->drawImage(clipRect,colorMapImage);
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//This line was causing re-painting loop
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//update();//Qt docs: Warning: If you call repaint() in a function which may itself be called from paintEvent(), you may get infinite recursion. The update() function never causes recursion
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painter->restore();
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}
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void ColorMapChart::addColorBar(QRectF plotAreaRect)
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{
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double maxZ = m_series->maxZ();
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double minZ = m_series->minZ();
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if(m_isColorBarDrawn)
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m_series->chart()->removeAxis(m_colorbar);
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m_colorbar = new QColorBarAxis(plotAreaRect,createColorMapGradient(m_gradientType),minZ, maxZ,this);
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m_series->chart()->addAxis(m_colorbar, Qt::AlignRight);
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m_isColorBarDrawn = true;
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}
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/*!
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Returns the predefined QLinearGradient corresponding to the \a gradientType passed as argument.
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*/
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QLinearGradient ColorMapChart::createColorMapGradient(GradientType gradientType)
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{
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QLinearGradient gradient(0,0,1,100);
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switch(gradientType)
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{
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case Rainbow :
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gradient.setColorAt(1.0,Qt::darkRed);
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gradient.setColorAt(0.8,Qt::red);
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gradient.setColorAt(0.6,Qt::yellow);
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gradient.setColorAt(0.4,Qt::green);
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gradient.setColorAt(0.2,Qt::cyan);
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gradient.setColorAt(0.0,Qt::blue);
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break;
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case CyclingRainbow :
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gradient.setColorAt(1.0,Qt::red);
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gradient.setColorAt(0.8,Qt::yellow);
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gradient.setColorAt(0.6,Qt::green);
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gradient.setColorAt(0.4,Qt::cyan);
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gradient.setColorAt(0.2,Qt::blue);
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gradient.setColorAt(0.0,Qt::magenta);
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break;
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case BlackAndWhite :
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gradient.setColorAt(1.0, Qt::black);
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gradient.setColorAt(0.0, Qt::white);
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break;
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case ReverseBlackAndWhite :
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gradient.setColorAt(1.0, Qt::white);
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gradient.setColorAt(0.0, Qt::black);
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break;
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default:
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break;
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}
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return gradient;
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}
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/*!
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Changes the type of gradient used to paint the ColorMap.
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*/
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void ColorMapChart::changeGradient(GradientType gradientType)
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{
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if(m_gradientType == gradientType)
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return;
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else
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m_gradientType = gradientType;
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emit gradientTypeChanged();
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}
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/*!
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Creates a color table corresponding to the gradient type currently selected.
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*/
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void ColorMapChart::populateColorTable()
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{
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QLinearGradient gradient = createColorMapGradient(m_gradientType);
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QGradientStops colorStops = gradient.stops();
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for(int i=0;i<nbOfColors;i++)
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{
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double colorIndex = (double)i/nbOfColors;
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for(int k =0;k<colorStops.size()-1;k++)
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{
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QGradientStop lowerBound = colorStops.at(k);
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QGradientStop upperBound = colorStops.at(k+1);
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if(colorIndex >= lowerBound.first && colorIndex < upperBound.first)
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{
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double ratio = (colorIndex-lowerBound.first)/(upperBound.first - lowerBound.first);
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int red = (int)((1-ratio)*lowerBound.second.red() + ratio*upperBound.second.red());
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int green = (int)((1-ratio)*lowerBound.second.green() + ratio*upperBound.second.green());
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int blue = (int)((1-ratio)*lowerBound.second.blue() + ratio*upperBound.second.blue());
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m_colorTable->append(qRgb(red, green, blue));
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break;
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}
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else
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{
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if(k==colorStops.size()-2)
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{
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m_colorTable->append(qRgb(colorStops.at(colorStops.size()-1).second.red(), colorStops.at(colorStops.size()-1).second.green(), colorStops.at(colorStops.size()-1).second.blue()));
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}
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}
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}
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}
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}
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//handlers
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void ColorMapChart::handlePointAdded(int index)
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{
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}
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void ColorMapChart::handlePointRemoved(int index)
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{
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}
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void ColorMapChart::handlePointsRemoved(int index, int count)
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{
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}
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void ColorMapChart::handlePointReplaced(int index)
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{
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}
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void ColorMapChart::handlePointsReplaced()
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{
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}
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void ColorMapChart::handleDomainUpdated()
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{
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}
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bool ColorMapChart::isEmpty()
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{
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}
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#include "moc_colormapchart_p.cpp"
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QT_CHARTS_END_NAMESPACE
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